Transcript Welcome to Today’s Training

Welcome to Today’s Training
MILITARY AIRCRAFT
EJECTION SYSTEMS
and
SHUTDOWN
Ejection Systems
• Ejection seats:
– may be
• gas powered
• rocket powered
– may remove:
• a single seat
• two seats , or
• a complete module
Zero-Zero
Ejection Systems
• Crew members fire the seats by pulling up
on:
– arm rests
– handles between legs
– face curtain behind head
• Rescue personnel should be aware that
efforts to remove pilots may activate the
ejection system unless it is safetied.
Ejection Systems
• Seats are safetied by interrupting the firing
sequence, pinning, or cutting the initiator
hose.
• It may take several pins to safety a seat.
• In cutting hydraulic lines be sure to
completely cut the line.
• Hands on training is necessary to become
competent and confident in seat safety
procedures.
Basic Design
Ejection Operation
Modular
Canopies
• Canopies are designed of a metal
framework around a Lexan™ covering.
• There are 3 basic types of canopies:
– Sliding
– Clamshell, and
– Hinged
• The sliding and clamshell are the most
common.
Canopies
• Canopies are opened normally, either:
–
–
–
–
Pneumatically
Electrically
Hydraulically
Manually
• Most military aircraft will have canopy
controls on the exterior of the cockpit.
Canopies
• In Emergencies canopies may be jettisoned.
• This may also be done from a panel on the
side of the aircraft or by the flight crew.
• In jettisoning the canopy is fired by an
explosive device away from the aircraft.
• Canopies should only be jettisoned if
absolutely necessary.
• Jettisoning by ignite fuel vapors
Entering Canopy
Propellant Actuating Devices
• Ejection seats and canopies use Propellant
Actuating Devices to initiate their function.
• Most require altitude and velocity to
operate, though some have zero-zero
capability.
• They are: Canopy removers, Initiators,
Rotary actuators, Thrusters, Explosive
Squibs and Seat Catapults.
Canopy Removers
• Generally they are gas powered telescoping
devices that forcefully jettison the canopy in
and emergency.
• Expanding gases force the telescoping tube
to extend and remove the canopy.
Initiators
• Initiators are cylindrical shaped devices that
provide gas pressure required to START a
sequence of events in the ejection process.
• When the initiator pin is pulled a cartridge
is fired which in turn fire the initiator.
• Hot gases flowing through tubes or hose
cause the canopy or seat to eject.
Rotary Actuators
• They perform various mechanical functions
in the aircraft.
• They are activated by the gas pressure from
the initiators or by electrical current.
• As part of the ‘Canopy Remover pad
Release” system they forcibly remove the
crew member from the seat after ejection.
Thrusters
• Thrusters are gas-operated devices that
unlock or reposition various units in the
escape system.
• For example they unlock canopy latches
just before jettison and move the seat and
leg guards into position prior to ejection.
Explosive Squibs
• Explosive squibs are small metal tubes
closed at on end and crimped with a rubber
plug on the other.
• They provide an ignition source .
• Flash-vented squibs emit a flame to ignite
rocket motors.
• Closed-end squibs are use in explosive
bolts and explosive release mechanisms.
Seat Catapults
• Catapults are telescoping ejection devices
used in the emergency ejection of crew
members.
• There are two types:
– Cartridge which propels the seat with enough
force to clear the aircraft. And,
– Rocket motor which provides enough thrust to
make sure the crew member clears the fast
moving aircraft.
Emergency Shutdown
Procedures
• These vary from aircraft to aircraft.
• The most common procedure requires:
– Pull the throttles back to IDLE position by
lifting past a detent.
– Activating the fire control system/s for the
aircraft engines if available.
– Shutting down the batteries.
– Batteries should always be done last because
some of the other functions may require
electricity.