Transcript S-TEC 55X with Altitude Selector/Alerter (ASA)

S-TEC 55X with
Altitude Selector/Alerter (ASA)
• Two axis, rate-based autopilot (from TC).
• Pitch modes: ALT, VS, GS
• Roll modes: HDG, NAV, GPSS, APR, REV APR
1
Roll Modes
• HDG: press HDG, aircraft flies hdg bug.
• NAV: press/hold HDG, then press NAV, HDG and NAV are lit.
Aircraft will fly hdg bug until intercept, HDG extinguishes and a/c flies
CDI. (ensure CDI: VLOC)
• GPS steering: press/hold HDG, then press NAV twice, HDG, NAV,
GPSS illuminate. Aircraft will fly hdg bug until intercept. HDG
extinguishes, a/c flies GPS flight plan. (ensure CDI: GPS)
Alternately, the pilot can allow autopilot intercept by pushing NAV
without HDG. Full scale CDI will establish 45° intercept,
progressively shallowing as intercept.
• APR: for increased sensitivity during approach. Also increases
sensitivity for enroute VOR, GPS tracking.
2
Pitch Modes
• ALT: a roll mode must first be selected. Press ALT. ALT illuminates and
aircraft holds current altitude. Altitude corrections can be made by
rotating VS knob (20’/click, max.360’).
• VS: Press VS, vs and current vs are displayed. Aircraft holds current
vert. speed. Selectable in 100’/min increments (±1600 fpm max.).
• GS: GS will arm when: NAV/APR/ALT selected; nav rcvr tuned to ILS
freq.; glideslope not flagged; aircraft below glideslope ≥60% and w/in
50% LOC deflection. When GS is intercepted, alt will extinguish. GS
mode can be forced by pressing ALT on 55X (e.g. if not below by 60%
or above glideslope).
Press APR to disarm or rearm GS. Ensure CDI: VLOC.
3
ASA altitude selector/alerter
• Provides altitude preselect, vertical speed select,
altitude and DH audio alert, and baro-corrected
altitude display.
• Pilot can deselect ASA and revert to normal 55X
operation by pressing MAN.
4
ASA altitude selector/alerter
• ASA has two modes:
Data entry – used to enter altimeter, desired altitude, and DH. Press
DTA - ENT illuminates. ASA cannot communicate with 55X while in
data entry mode. On pwr. up, ASA is in DTA mode waiting for
altimeter setting. Use knob to enter altimeter, then press DTA to exit.
Operate – ENT will be extinguished. ASA provides vertical command
info to 55X.
• Press DTA to enter data entry mode – enter data (baro, alt, DH) –
press DTA again to accept data and exit data entry mode.
• VS can be set directly in the operate mode by pushing VS and
turning knob (±1600 fpm).
5
ASA and 55X operation
•
ALT and VS modes are coupled to
the ASA. ALT and VS outputs to
55X by pressing and holding VS
then press ALT (on the 55X).
•
Before takeoff: enter cruise alt.
and desired climb rate. After
takeoff, above 400’ and in cruise
climb: press and hold VS then
press ALT (on 55X) to engage VS
mode and arm altitude to capture
and hold selected altitude.
•
To change altitude: press DTA –
enter new altitude – press DTA –
enter desired VS – press/hold VS
then ALT (on 55X). Aircraft will
climb or descend at selected rate
and capture new altitude.
6
ASA Altitude Alerter
• ALR: selected will provide alarms at 1000’ and 300’ from
selected altitude.
• DH: press DTA then DH to enter decision height/MDA,
then DTA again to accept entry. As aircraft approaches
w/in 50’ of selected altitude an alert will sound and DH
will flash. DH will alert again when below by 50’.
Pressing DH will disable DH function.
Gary Kauffman CFI, MEI, ATP
7