Transcript TH-67 Systems

Study Guide
(General Description, Flight Controls and Hydraulics, Rotors, and Power Plant)
1. Define the term WARNING
A. An operating procedure, practice, etc., which if not strictly observed could
result in damage to or destruction of equipment.
B. A mandatory procedure
C. An operating procedure, practice, etc., which if not correctly followed could
result in personal injury or loss of life.
D. Indicated futurity
2. Define the term CAUTION
A. An operating procedure, condition, etc., which is essential to highlight.
B. An operating procedure, practice, etc., which if not strictly observed could
result in damage to or destruction of equipment.
C. An operating procedure, practice, etc., which if not correctly followed could
result in personal injury or loss of life.
D. Indicates futurity
3. Define NOTE
A. A mandatory procedure
B. Recommended or preferred, not mandatory.
C. Indicates futurity
D. An operating procedure, condition, etc., which is essential to highlight.
4. Define the term SHALL
A. Indicated futurity
B. A mandatory procedure
C. An optional procedure
D. Recommended or preferred, not mandatory
5. Define the term SHOULD
A. Recommended or preferred, not mandatory
B. An optional procedure
C. A mandatory procedure
D. An operating procedure, condition, etc., which is essential to highlight
6. Define the terms MAY or NEED NOT
A. Indicated futurity
B. A mandatory procedure
C. A condition that you may do or not
D. An optional procedure
7. Define the term WILL
A. An optional procedure
B. Indicates futurity
C. A mandatory procedure
D. A procedure that will be done
8. The three sections of the TH-67 fuselage are
the _____, _______, and the _______ section.
A. cockpit, cabin, and aft boom
B. front, intermediate, and back tail
C. forward, intermediate, and tail boom
D. cockpit, cabin, and tail
9. The VFR & A+ configuration have one pitot that
provides _______ air to the airspeed indicator and two
vents that provide _____ air to the static instruments.
A. direct, indirect
B. pressure, kinetic
C. impact (ram), static
D. direct, static
10. The IFR configuration has __ ______
pitot/static systems.
A. 4 separate
B. 3 individual
C. 2 independent
D. 2 individual
11. The TH-67 ____ light, located on the aircraft nose
provides a 450 watt lamp in an extendable and
slewable mount.
A. landing
B. position
C. collision
D. search
12. The TH-67 ____ light, located on the aircraft
nose provides a 250 watt lamp in a fixed mount.
A. landing
B. search
C. position
D. collision
13. How many switches are used to control the search
light in the NVG mode on the A+ configuration?
A. 2, one for selecting IR light, and one to turn it on.
B. 4, one to turn it on, one to select white light, one to select IR light, and one to
slew the search light to extended and retracted position.
C. 3, one to select the IR light, one to turn the light on, and one to slew the search
light to the desired position.
D. 2, one on/off switch, and one to select IR.
14. What does the term semi-monocoque mean?
A. The skin of the aircraft provides all of the structural strength
B. The aircraft skin provides none of the structural strength
C. The aircraft skin provides some of the structural strength
D. None of the above
15. The TH-67 intermediate section uses a ____
type of construction.
A. semi-rigid
B. semi-flex
C. semi-monocoque
D. monocoque
16. Which section of the aircraft contains the
engine?
A. The forward section
B. The cabin section
C. The engine/transmission section
D. The intermediate section
17. The TH-67 tail boom section uses ___ ______
type of construction.
A. semi monocoque
B. partial monocoque
C. fully monocoque
D. semi rigid
18. State the purpose of the vertical fin.
A. Provides vertical stability on the x-axis
B. The vertical fin, being displaced (canted) 5 ½ degrees to the right thus
reducing the tail rotor thrust requirements in forward flight
C. Off-loads the tail rotor between 80 and 100 knots
D. Provides vertical stability on the yaw axis
State the purpose of the horizontal stabilizer.
A. Maintains a desirable aircraft attitude through the high end of the airspeed
range. The metal strip at its leading edge provides for autorotational stability.
B. Provides pitch (up and down) about the lateral axis
C. Provides horizontal control of the aircraft during low “G” maneuvers.
D. None of the above
19. At what airspeed is the tail rotor fully offloaded in forward flight?
A. Between 110 and 130 knots
B. Between 90 and 120 knots
C. At 100 knots
D. Between 100 and 110 knots
20. The nomenclature of the TH-67 power plant is
the model _______.
A. T700-GE-401C
B. JP-WD40
C. PW-123-J
D. 250-C20J
21. State the maximum torque available (MAX TQ
AVAIL).
A. 107% TQ for 15 seconds max
B. 100% TQ for 5 minutes max
C. >85% to 100% for 5 minutes max
D. 100% TQ for 5 seconds max
22. State the maximum continuous power (TQ
AVAIL CONT) of the TH-67 power plant.
A. 85% TQ (270 SHP) no time limit
B. 85% TQ (270 SHP) take-off power range 5 minute limit
C. >85% to 100% TQ maximum
D. 100% TQ no time limit
23. Can the maximum transient power setting
(110% TQ) be used intentionally?
A. Yes, 5 minutes limit
B. Yes, 5 seconds limit
C. No, only when executing high ‘G’ maneuvers
D. No, intentional use is prohibited
24. State the diameter of the TH-67 main rotor.
A. 52’ 4”
B. 42’ 4”
C. 33’ 4”
D. 44’ 3”
25. What type of airfoil is the main rotor blade?
A. A honey comb airfoil
B. A symmetrical airfoil
C. An asymmetrical airfoil
D. None of the above
26. How many degrees of twist are there in the
main rotor blade?
A. A positive 10 degrees
B. A negative 5 degrees
C. A positive 5 degrees
D. A negative 10 degrees
27. State the tail rotor diameter.
A. 5’ 10”
B. 4’ 5”
C. 5’ 5”
D. 8’ 5”
28. How many degrees of pitch are in the tail
rotor with full left pedals applied?
A. 25 degrees
B. 23 degrees
C. 17 degrees
D. 21 degrees
29. State the TH-67 Vne
A. 122 knots
B. 78 knots
C. 130 knots
D. 100 knots
29. State the maximum airspeed limitation with
>85 to 100% TQ applied.
A. 78 knots
B. 110 knots
C. 80 knots
D. 122 knots
31. State the minimum rate of descent airspeed
in autorotation.
A. 50 knots @ 394 RPM (100% rotor RPM)
B. 69 knots @ 394 RPM (100% rotor RPM)
C. 52 knots @ 394 RPM (100% rotor RPM)
D. 60 knots @ 394 RPM (100% rotor RPM)
32. State the maximum glide distance airspeed in
autorotation.
A. 69 knots @ 394 RPM (100% rotor RPM)
B. 79 knots @ 394 RPM (100% rotor RPM)
C. 52 knots @ 394 RPM (100% rotor RPM)
D. 60 knots @ 394 RPM (100% rotor RPM)
33. State the minimum crew restriction VFR and
IFR.
A. VFR minimum 1 pilot, IFR minimum 1 pilot and 1 observer
B. VFR minimum 2 pilots, IFR minimum 1 pilot
C. VFR minimum 1 pilot, IFR minimum 2 pilots
D. VFR minimum 1 student, IFR minimum 1 student and 1 pilot
34. State the fuel capacity of the TH-67 fuel cell.
A. 69.4 U.S. gallons total; 64.2 U.S. gallons useable; 2.3 U.S. gallons unusable
B. 81.4 U.S. gallons total; 64.2 U.S. gallons useable; 1.5 U.S. gallons unusable
C. 69.4 U.S. gallons total; 68.2 U.S. gallons useable; 1.3 U.S. gallons unusable
D. 84.1 U.S. gallons total; 82.6 U.S. gallons useable; 1.5 U.S. gallons unusable
35. Why must the engine oil system be drained and
refilled if transmission and engine oils are intermixed?
A. To prevent chemical reaction
B. To prevent damage to the engine oil seals
C. If the two are mixed they become very flammable
D. To prevent damage to the transmission
36. In a conventional helicopter, what are the three
basic flight controls that are used to maneuver the
aircraft?
A. Throttle, stick, rudder
B. Cyclic, stick, collective
C. Cyclic, collective, tail rotor (anti-torque) pedals
D. Stick, elevator, vertical fin
37. In a conventional helicopter, which flight control
directs the total lift/thrust of the main rotor system?
A. The collective
B. The stick
C. The pedals
D. The cyclic
38. Which conventional helicopter flight control will
input a pitch change to all main rotor blades
simultaneously regardless of the blades position?
A. Cyclic
B. Rudder
C. Collective
D. Stick
39. In a conventional helicopter, the rotation of the
main rotor induces a force known as torque. Describe
the effects this force has on the fuselage.
A. The torque force will cause the fuselage of the aircraft to rotate in the same
direction of the main rotor
B. The torque force will cause the fuselage of the aircraft to rotate in the opposite
direction of the main rotor
C. No effect is observed since rotor torque and fuselage torque will be equalized
D. None of the above
40. State the primary purpose of the tail rotor
system in a conventional helicopter.
A. Provides directional control
B. Yaws the aircraft
C. To counter-act the torque effects of the main rotor
D. Provides right and left inputs on a hover
41. The ___ ____ controls will provide directional
control (heading) of the aircraft during hovering, as
well as trimming the fuselage of the helicopter at
higher speeds.
A. Cyclic pedals
B. Stick pedals
C. Tail rotor
D. A and B
42. Cyclic control inputs (fore/aft and lateral) are
considered independent up to the _____ ______ from
there on up to the non-rotating swash plate they are
considered ______.
A. intermixing bellcrank, coordinated
B. self adjusting controls, manual
C. intermixing push rods, coordinated
D. self input controls, manual
43. In the VFR configuration, what happens to the
pilot’s cyclic stick if left unattended when the copilot’s
cyclic stick is removed?
A. Nothing, there is no difference with both or just one cyclic stick
installed/removed
B. The reduced load on the balance spring will cause the pilot’s cyclic stick to
creep aft slightly
C. If this situation is encountered you must not go flying do to lack of controls on
the aircraft
D. You must maintain right cyclic input to counteract for the missing copilot’s
cyclic stick
44. Where is the cyclic friction knob located?
A. Right on the base of the copilot’s cyclic stick
B. There is not such thing installed in the TH-67 helicopter
C. In between the pilot and copilot seat
D. Left of the base on the pilot’s cyclic stick
45. How much preload is on the cyclic system
with the aircraft running and the hydraulics on?
A. 2 to 3 pounds preload
B. 1 to 1 ½ pounds preload
C. 2 ½ to 4 pounds preload
D. ½ to 1 pound preload
46. Which aircraft configuration has the force
trim system?
A. VFR only
B. IFR only
C. A+ only
D. All of the above
47. What switches are located on the pilot’s
collective stick control head?
A. On/off switch, landing light, fuel start
B. Search light switches, landing light, governor RPM increase/decrease, and the
starter button
C. There is no switches on the pilot’s collective stick; all switches are located on
the copilot’s collective stick
D. Fuel valve switch, landing light, starter button, and hover button
48. Where is the collective friction located?
A. It is located on the right of the copilot’s collective stick base
B. Right behind the pilot’s anti-torque pedals
C. It is located on the left of the pilot’s collective stick base
D. No such thing installed in the TH-67 helicopter
49. What switches are located on the co-pilot’s
collective control head?
A. The search light switch, landing light, governor RPM increase/decrease, and
the starter button
B. Fuel valve switch, throttle switch, landing light, and hover switch
C. There is no c0-pilot collective control head
D. Eject switch, landing light, fuel valve switch, and avionics
50. What amount of collective control preload is
built into the collective flight control system?
A. 2 to 4 pound preload
B. 1 to 3 pound preload
C. 4 to 6 pound preload
D. 3 to 5 pound preload
51. Which collective control stick is removable
and why?
A. The co-pilot‘s collective stick is removable in case a non-rated passenger is
flown in the co-pilot’s seat
B. The pilot’s collective for egress purposes
C. Neither the pilot or co-pilot’s collective stick can be removed unless is for
maintenance reasons only
D. None of the above
52. Which direction can the tail rotor pedals be
adjusted?
A. Forward only
B. Aft only
C. Pedals are fixed and can not be re-adjusted
D. The pedals can be adjusted fore and aft
53. What changes the pitch (angle-of-attack) in
the tail rotor through the lever assembly?
A. The pitch horn
B. The tail rotor bell cranks
C. The pitch change links
D. The anti-torque pedals
54. What is the preload on the tail rotor system?
A. 1 to 3 pounds preload
B. 3 to 5 pounds preload
C. 2 to 5 pounds preload
D. 4 to 5 pounds preload
55. Does the tail rotor system have hydraulic
assist?
A. The tail rotor system does not have hydraulics
B. Yes
C. Yes, but only in the retreating blade to prevent tail vibrations
D. None of the above
56. The TH-67 flight control system can best be
described as ____ ____ ____ with hydraulic assist.
A. fully articulated links
B. hydro mechanical linkages
C. direct mechanical linkages
D. articulated mechanical links
57. The purpose of the hydraulic servo actuator
installed to the cyclic and collective controls is to
convert ____ ____ under pressure into ____ ____
work.
A. JP-8 fuel, carbon monoxide
B. hydraulic fluid, useful mechanical
C. servo fluid, useful mechanical
D. Hydraulic fluid, control movement
58. The TH-67 hydraulic pump is a constant ____,
_____ delivery system component providing 600 +/- 25
psi, and _____ GPM flow rate.
A. pressure, variable, 1.9
B. flow, direct, 2.3
C. pressure, flow, 1.2
D. flow, pressure, 1.9
59. The purpose of the differential release valve is to
reduce ____ ____ ____ when rotor loads are increased
due to high “G” maneuvers or flight into turbulence.
A. rotor centrifugal forces
B. transmission high speeds
C. engine high speeds
D. pressure build up
60. With regard to cyclic input, does the blades
position in the plane of rotation matter?
A. No
B. Only during forward flight
C. Yes, the desired input does not occur until the blade is positioned exactly 90º
earlier in the plane of rotation (phase lag)
D. Only during right side flight above 20 knots
61. What drives the rotating swash plate?
A. The transmission
B. The power turbine
C. The connection of the collar set and idler lever/link assembly to the rotating
swash plate
D. The rotating scissors
62. What is another name for the collar set and
idler lever/link assembly?
A. The drag link assembly
B. The rotating link assembly
C. The rotating swash plate link
D. None of the above
63. What connects the rotating swash plate to
the pitch change horn?
A. The pitch control rods (PCR)
B. The pitch change tubes
C. The swash plate tubes
D. The pitch horn tubes
64. What type of rotor system is used on the
TH-67 helicopter?
A. Fully articulated rotor system
B. Fully aerobatic rotor system
C. Rigid, semi-articulated rotor system
D. Semi-rigid, under slung rotor system
65. How is the rotor system attached to the
mast?
A. It is attached to the mast by 4 grade 1172 steel bolts
B. The rotor system is attached to the mast by means of bolts, washer, and nuts
C. The rotor system is attached to the mast by a splined trunnion
D. None of the above
66. What is the definition of a trunnion?
A. A component that holds things together
B. The act of bringing two objects of dissimilar shapes to form one
C. A component that allows rotation and tilt
D. To turn or to be turned
67. What is the purpose of the yoke?
A. Attaches the main rotor and main transmission to the hub
B. To support the main rotor system and serves as the pitch change axis
C. Sends a signal to the cockpit to let the pilot know of exact angle of pitch in the
main rotor blades
D. A and C
68. How is the trunnion attached to the yoke?
A. The trunnion is attached to the yoke by pillow blocks
B. The trunnion is attached to the yoke by 2 high impact type 117 grade steel bolts
C. The trunnion is attached to the yoke by the go/no-go fly wheel assembly
D. The trunnion does not attached to the yoke by any means. They are two
separate systems independent of one another
69. What kind of balancing requires lead weights
to be added to the blade retention bolt?
A. Trailing edge balancing requires lead weights to be added to the blade
retention bolts
B. Sprout rigging balancing requires lead weights to be added to the blade
retention bolts
C. WARNING. Never add weights to the blade retention bolts
D. Spanwise (root to tip) balancing requires lead weights to be added to the blade
retention bolts
70. What distributes the centrifugal load from the
blade grip to the yoke?
A. The under-slung design of the TH-67 rotor system
B. The yoke centrifugal bearings
C. Tension torsion straps
D. The is no centrifugal force load from the blade grip to the yoke
71. What structural members make up the main
rotor blade?
A. The titanium spar, the chamber, and the trailing edge
B. The aluminum spar, the spar closure, and the trailing edge
C. The titanium spar, the spar closure, and the trailing edge
D. Aluminum, honey comb, and titanium
72. Weights are added at the factory at the time of
manufacturing to control the undesirable twisting
associated with asymmetrical airfoils and to preserve
favorable aerodynamic characteristics.
A. True
B. False
73. Why does the main rotor blades have a
negative 10º twist?
A. The negative twist is designed to equalize lift during autorotation
B. The negative twist is designed to prevent turbulence during high power/high
“G” maneuvers
C. There is no negative twist on the main rotor blades
D. The negative twist is designed to equalize lift along the blade span (length)
74. The “droop snoot” is known for what
aerodynamic characteristics?
A. The “droop snoot” design is noted for a wide thrust margin for
maneuverability and high efficiency during forward flight
B. The “droop snoot” design is noted for a wide thrust margin for
maneuverability and high efficiency during hovering
C. The “droop snoot” design is noted for a wide thrust margin for
maneuverability and high efficiency during turns
D. The “droop snoot” design is noted for a wide thrust margin for
maneuverability and high efficiency during autorotation
75. How many trim tabs are there on the main
rotor blade?
A. Two trim-tabs, one for adjusting A+ vibrations and the other one to adjust B+
vibrations
B. Just one trim-tab
C. Three trim-tabs, one for adjusting the inner blade track, a second for the
middle blade track, and a third for the outer blade track
D. Two trim-tabs, one for adjusting the inner blade track, and a second trim-tab
is used to adjust the outer portion of the blade’s track
76. What are doublers used for on the main rotor
blade?
A. They are applied at the blades root to sustain the shearing force caused by the
centrifugal force occurring at the blade retention bolt
B. Used to equalize lift along the blade span (length)
C. They are designed to stop excessive droop (lower motion of the blade) and
conning (upper movement of the blade)
D. Doublers are used on the main rotor to reduce main rotor vibrations during
slow autorotations
77. What is the purpose of the flap restraint kit?
A. Its purpose is to limit flapping during autorotations
B. Its purpose is to limit flapping during high power maneuvers
C. Its purpose is to limit flapping during startup and shutdown
D. The is no flap restraint system installed on any under-slung rotor system
78. At what RPM is flapping limited to 6º
maximum?
A. At 90% N2 and below
B. At 97% N2 and below
C. At 25% N2 and below
D. At 31% N2 and below
79. At what RPM is the flapping angle no longer
limited?
A. Above 31% N2 RPM
B. Above 85% N2 RPM
C. Above 90% N2 RPM
D. Above 25% N2 RPM
80. How is the tail rotor assembly mounted to the
tail rotor output shaft?
A. It is mounted to the tail rotor output shaft by a quick disconnect fitting
B. It is mounted to the tail rotor output shaft by a splined trunnion
C. It is mounted to the tail rotor output shaft by two crossheads bolts
D. It is mounted to the tail rotor output shaft by a spherical bearing
81. How does the tail rotor system compensates
for dissymmetry of lift?
A. The tail rotor assembly compensates for dissymmetry of lift through the
chordwise hinge by allowing the blade to feather as it flaps
B. The tail rotor assembly compensates for dissymmetry of lift through the
trunnion hinge by allowing the blade to feather as it flaps
C. The tail rotor assembly compensates for dissymmetry of lift through the
crosshead hinge by allowing the blade to feather as it flaps
D. The tail rotor assembly compensates for dissymmetry of lift through the delta
hinge by allowing the blade to feather as it flaps
82. What are the washers on the blade bolts used
for?
A. They are used for preventing corrosion from dissimilar metals
B. They are used for counter weight
C. They are used for spanwise balancing
D. None of the above
83. What are the rectangular weights and
washers on one end of the trunnion used for?
A. They are used for chordwise balance
B. They are used for spanwise balance
C. They are used for trailing edge balance
D. They are used for leading edge balance
84. What are the nut, bolt, and washer(s) used
for on the dynamic balance wheel?
A. They are used to eliminate high frequency vibrations and to assist in spherical
and chordwise balance
B. They are used to eliminate high frequency vibrations and to assist in spanwise
and trailing edge balance
C. They are used to eliminate high frequency vibrations and to assist in spanwise
and chordwise balance
D. None of the above
85. Where are the weights that are added at the
factory located?
A. They are located on the outboard trailing edge and the blade tip
B. They are located on the inboard trailing edge and the leading edge
C. They are located on the inboard trailing edge and at the blade tip
D. None of the above
86. What are the washers on the pitch horns used
for?
A. They are used as aerodynamic balance during steep turns/high “G” maneuvers
B. There are no washers installed on the pitch horn
C. They are used as aerodynamic balance to eliminate “pedal creep”
D. They are used for spanwise balancing
87. The TH-67 engine’s rated shaft horsepower is
de-rated for _____ ______.
A. 100% TQ
B. 85% TQ
C. Transmission compatibility
D. Turbine comapatibility
88. The statement that best describes the TH-67
engine is “Internal combustion gas turbine featuring a
______ ______ ______.
A. free gas turbine
B. free power turbine
C. reverse combustion chamber
D. compressor discharge tube
89. What are two advantages of a free turbine?
A. Reduces cost throughout the Army, and since is free it does not require
calibration every 1,000 hours of flight
B. Provides reduced load for starting , and each turbine operates at optimum
RPM capacity
C. No mechanical connection between the gas turbine thus reducing friction and
loss of power, and they can be operated independently of each other
D. No cost to the Army, and they are light weight
90. The purpose of the Air Barrier Filter is to
provide clean ______ air to the engine.
A. particle-free
B. fresh
C. cool
D. All of the above
91. Will the engine air be filtered if the ENG ALT
AIR switch is placed in the open position?
A. Yes, but only 39% of the air passing through will be filtered
B. No such switch installed in the TH-67 helicopter
C. Yes, when the air filtered is bypass, filtered air will still be going into the
engine through the secondary filtration system
D. No, when the air barrier filter is bypass, unfiltered air will be going into the
engine
92. What indication will the pilot receive when
the air barrier filter is blocked/clogged?
A. The FILTER CLOGGED caution light will illuminate
B. The HIGH INLET PRESSURE caution light will illuminate
C. The LOW INLET PRESSURE caution light will illuminate
D. There is no indication sent to the cockpit for this condition
93. What are the four sections of the model 250C20J turbine engine?
A. Intake, compressor, combustion, and exhaust section
B. Power turbine, combustion chamber, exhaust, and ignition section
C. The compressor, power and accessory gearbox, turbine, and combustion
section
D. The stator vanes, the rotating vanes, the centrifugal stage, and the impeller
section
94. What does the bleed air control valve do?
A. It aids in rapid engine acceleration and helps prevent compressor stalls
B. It controls the amount of bleed air needed for cabin/cockpit heating
C. It controls bleed air for de-icing of the compressor inlet vane
D. Both B and C
95. What are the five customer bleed air ports on
the diffuser scroll?
A. Anti-icing, vent and cap, discharge air, exhaust holes, and PC filter
B. The engine anti-ice valve, bleed air control valve, two cabin heat ports, and PC
air filter
C. Two cabin heat ports, cockpit heat port, and the PC air filter
D. None of the above
96. What is the purpose of the cap on the rear
diffuser vent and cap?
A. To increase air pressure on one side of two labyrinth seals as the compressor
experiences wear.
B. To equalize the high pressure between the diffuser and the compressor section
C. To prevent Foreign Object Damage (FOD) from entering the diffuser
D. Vents out high pressure from the diffuser and redirects it to the compressor
97. The compressor consists of how many and
what kind of compressor stages?
A. It consists of four axial stages and one centrifugal stage
B. It consists of five axial stages and two centrifugal stage
C. It consists of five axial stages and one centrifugal stage
D. It consists of six axial stages and one centrifugal stage
98. On a standard day the airs temperature increases
to approximately ___ ºF by the time it goes through
the seventh stage of compression.
A. 1270
B. 456
C. 502
D. 520
99. What are the only items provided with antiicing capability?
A. The engine inlet, and the windshield
B. The windshield, and the main rotor blade leading edge
C. Both, main and tail rotor blades leading edges
D. The front support hub and the seven inlet guide vanes
100. Should the bleed-air control valve be
opened or closed on preflight?
A. The bleed-air control valve SHALL be closed on preflight or maintenance
action is required
B. This valve can not be seen unless parts from the engine are removed during
major overhaul to the engine
C. The bleed-air valve SHOULD be closed on preflight or maintenance action is
required
D. The bleed-air valve SHALL be open on preflight or maintenance action is
required
101. When does the spark cease to exist in the
combustion section of the engine?
A. When N1 reaches 90% RPM
B. When N2 reaches 90%
C. When the starter button is released
D. The spark never ceases unless there is a failure of the exciter box or engine
tachometer generator
102. What is the temperature of the flame in the
combustion section of the engine?
A. Approximately 4500 ºF
B. Approximately 5500 ºF
C. Approximately 3500 ºF
D. Approximately 2500 ºF
103. What is the melting point of titanium?
A. 3200 ºF
B. 220 ºF
C. 320 ºF
D. 2200 ºF
104. How much of the compressed air is used for
combustion?
A. Approximately 20 to 25%
B. Approximately 50 to 60%
C. Approximately 70 to 80%
D. Approximately 80 to 95%
105. T or F Approximately 75 to 80% of the air is used
to cool and center the combustion flame plus drive the
five customer bleed-air accessories.
A. False
B. True
106. What principle takes advantage of impact
and reaction forces?
A. Newton’s third law of action and reaction
B. Newton’s first law of inertia
C. The gas turbine principle
D. The action reaction principle
107. Changes in ____ ______ cause changes in
fuel flow.
A. power settings
B. wind conditions
C. pressure altitude
D. high temperature
108. Changes in fuel flow will cause changes in
_______ of the gases entering the turbine rotors.
A. flow
B. cooling
C. temperature
D. expansion
109. Combustion gases impact the gas producer and
the turbine rotors inducing _____________________.
A. rotation of the compressor
B. rotation of the accessory gearbox
C. rotation of the free wheeling unit
D. rotation of the turbine shaft
110. An increase in expansion rate/velocity induces an
increase in _____ that is transmitted through the N2
gear train as measurable _______.
A. air, RPM
B. torque, horsepower
C. fuel, shaft torque
D. fuel, horsepower
111. Which section of the engine is the primary
structural member of the engine?
A. The power and accessory gearbox section
B. The compressor section
C. The combustion section
D. The power turbine section
112. What is designed to reduce the high RPM
required for horsepower development to more
practical RPM at the accessory output pads?
A. The reverse flow combustion chamber
B. Electrical motors dedicated just to the accessory output pads
C. Two separate gear trains (N1 and N2)
D. The N1 tachometer and the N2 tachometer
113. Which section of the engine is driven by the
gas producer gear train?
A. The oil cooler section is the only section driven by the N1 gear train
B. The combustion section is the only section driven by the N1 gear train
C. The turbine section is the only section driven by the N1 gear train
D. The compressor section is the only section driven by the N1 gear train
114. The fuel pump, gas producer fuel control,
starter/generator, oil pump, tachometer generator,
and the standby generator (only on the IFR
configuration) are driven by what gear train?
A. N2 gear train
B. N1 gear train
C. Both, N1 and N2 gear trains
D. None of the above
115. The freewheeling unit, the torque meter, the
governor, and the tachometer generator are driven by
what gear train?
A. N1 gear train
B. N2 gear train
C. Both, N1 and N2 gear trains
D. None of the above
116. The N1 and N2 tachometer generators
produce what kind of voltage?
A. Direct Current (DC) voltage
B. Alternate Current (AC) voltage
C. The N1 DC voltage, and the N2 AC voltage
D. The N1 AC voltage, and the N2 DC voltage
117. The starter portion of the starter/generator is
used to “crank” the ____ _____ _____ during the start
sequence.
A. N2 gear train
B. engine combustion section
C. N1 gear train
D. accessory gear box
118. The generator portion of the starter/generator
provides ____ ____ voltage to all of the helicopter’s
electrical systems plus it re-charges the ___ _____.
A. alternate current, main battery
B. direct current, standby battery
C. direct current, main battery
D. alternate current, standby battery
119. How are the gas producer fuel control and
the governor integrated?
A. They are integrated by pneumatic connections
B. They are integrated by mechanical connection
C. They are integrated by hydro mechanical connections
D. They are integrated electrically
120. What is the purpose of the burner drain
valve?
A. To burn fuel that remains on the outer combustion case
B. To drain unburned fuel from the combustion chamber back to the fuel tank
C. To allow unburned fuel to drain from the outer combustion case
D. None of the above
121. The purpose of the dual accumulator-double
check valve is to ____ _____ ______ from the main
rotor system.
A. reduce the vibrations
B. dampen torsional vibrations
C. maintain CG balance
D. None of the above
122. Where is the combustions gas temperature
measured on the C20-J turbine engine?
A. Right before the N1 rotor
B. Right after the gas passes by the N2 rotor
C. Right in between the N1 and the N2 rotors
D. A and B
123. Where is the engine oil temperature
measured?
A. At the combustion chamber #7 bearing solenoid
B. It is measured as the oil leaves the bottom of the engine oil reservoir
C. It is measured by a “wet” line (direct oil pressure)
D. By a “wet” line (direct pressure reading)
124. How is the engine oil pressure measured?
A. It is measured in PSI by a “dry” line
B. It is measured in PSI by the transmission pressure gauge
C. It is measured by a “wet” line (direct oil pressure)
D. It is measured as it passes through the #2 and #7 bearing
125. How is the engine torque measured?
A. By a “wet” line (direct pressure reading)
B. By the difference in pressure from the sump and the pump
C. It is measured by a “wet” line (direct oil pressure)
D. None of the above
126. Which engine bearings are externally
lubricated?
A. Bearings 1, 2, 5, and 8
B. Bearings 5, 6, 7, and 8
C. Bearings 2, 2 ½, 6, 7, and 8
D. Bearings 1, 6, 7, and 8
127. How many engine oil chip detectors will
activate the ENG Chip caution light?
A. One (the accessory section chip detector)
B. One (the temp/chip detector)
C. Two ( the #1 and #2 chip detectors)
D. Two (the sump and the pump chip detectors)
128. The auxiliary oil filter has a “pop-up” feature
that activates at __ PSID.
A. 17
B. 10
C. 7
D. 40
129. After completing lubrication, oil is scavenged into
a sump below the number __ and __ bearings and at
the bottom of the gear case.
A. 2, 2 ½
B. 3, 4
C. 5, 6
D. 6, 7
130. How many engine oil bypasses are there?
A. There are 4 bypasses. Auxiliary oil filter (10 PSID), oil cooler (thermal bypass
below 81º C or 178º F), oil cooler (40 PSI clogged oil cooler), and internal oil
filter (150 PSID)
B. There are 4 bypasses. Auxiliary oil filter (7 PSID), oil cooler (thermal bypass
below 81º C or 178º F), oil cooler (40 PSI clogged oil cooler), and internal oil
filter (105 PSID)
C. There are 4 bypasses. Auxiliary oil filter (10 PSID), oil cooler (thermal bypass
below 81º C or 178º F), oil cooler (40 PSI clogged oil cooler), and internal oil
filter (105 PSID)
D. There are 4 bypasses. Auxiliary oil filter (10 PSID), oil cooler (thermal bypass
below 81º F), oil cooler (40 PSI clogged oil cooler), and internal oil filter (105
PSID)
131. How many “wet” lines are there associated
with the engine oil system?
A. Three (the engine oil pressure, and torque meter gauges, and the transmission
oil pressure gauge)
B. Two (the engine oil pressure, and the transmission oil pressure gauge)
C. Two (the engine oil pressure, and the torque meter gauges)
D. Three ( transmission oil and pressure gauges, and the torque meter gauge)
132. Is defined as a decrease in N2 RPM that exists
between the time a demand for power is made and
the time that power is delivered?
A. Spike knock
B. Mast bumping
C. Droop
D. Flapping stop
133. Is droop allowed to exist?
A. No, INTENTIONAL USE IS PROHIBITED
B. Yes, 5 minute limit
C. Only momentarily, otherwise rotor RPM may become critically low
D. Yes, but rotor RPM must be at 107% RPM to compensate for droop
134. How is droop compensated for?
A. By lowering the collective, and turning the engine anti-ice and heater switches
off
B. Once droop is encounter you must wait until the aircraft recovers from it
C. Through mechanical linkages (collective stick to governor lever), electrical
connections (governor increase/decrease switch and linear actuator motor),
and a pneumatic signal between the N2 governor and the gas producer fuel
control passing through the dual accumulators and double check valve
D. By lowering the collective and maintaining 107% max RPM
135. Why is the engine mounted horizontally
behind the transmission
A. To simplify the drive system, improve the air intake/exhaust arrangement, and
to reduce cabin noise
B. All helicopter must have the engine horizontally mounted for weight and
balance purposes
C. By the engine being mounted horizontally it will improve the autorotational
capability by 40%
D. For no particular reason, it’s just the way the engineers wanted it mounted
136. How are three bipod mounts used to secure
the engine?
A. Semi-rigid
B. Flexible for vibration reduction
C. Rigidly
D. None of the above