TM 55-1520-240-T
11-3.3 AFCS OPERATIONAL CHECK (Continued)
11-3.3
TASK
RESULT
CHECK NO. 2 AFCS
23. Set SYSTEM SEL switch (26) to BOTH, pause for 10
NO. 1 AFCS OFF and NO. 2 AFCS OFF (Without 74)
seconds then set it to OFF through position 2.
AFCS 1 and 2 (With 74) capsules (27 and 28) shall come
on. If NO. 1 AFCS OFF (Without 74) AFCS 1 (With 74)
(capsule (27) is out, go to Task 11-3.13. If NO. 2 AFCS
OFF (Without 74) AFCS 2 (With 74) capsule (28) is out,
go to Task 11-3.14.
24. Set SWIVEL switch (26) to LOCK.
25. Turn pilot's radar altimeter LO SET knob (30) until lo
Radar altimeter OFF flag shall go out of view. Digital
set index (31) is at 100.
readout shall indicate 0 to 5 feet after 1 minute warmup.
If OFF flag is still in view or digital indication is not 0 to 5
feet, refer to TM 11-1520-240-20 for troubleshooting
information.
26. Turn pilot's HSI HDG knob (32) until heading cursor
(33) is 30° degrees clockwise from aircraft heading.
27. Press and release pilot's CMD SEL switch (34).
CMD SEL caption shall come on. If it does not, refer to TM
11-1520-240-20.
28. Check that both ENGINE CONDITION levers (35 and
Set them to STOP if required.
36) are at STOP.
29. Check that CYCLIC TRIM AUTO MANUAL switch (37)
Set switch to AUTO if required.
is at AUTO.
30. Check FWD and AFT CYC TRIM indicators (38 and
Pointers on both indicators (38 and 39) shall be in GND
39).
position. If both pointers are not in GND position, go to
Task 11-3.15. If FWD CYC TRIM indictor pointer is not at
GND position, go to Task 11-3.16. If AFT CYC TRIM
indicator pointer is not at GND position, go to Task
11-3.17.
TASK
RESULT
31. Set SYSTEM SEL switch (26) to 2.
NO. 2 AFCS OFF (Without 74) AFCS 2 (With 74)
capsule (28) shall go out. No large Integrated Lower
Control Actuator (ILCA) engagement transients (har-
dovers) shall occur. If capsule (28) is still on, go to Task
11-3.27. If large ILCA engagement transients (hardovers)
occur, go to Task 11-3.28 for pitch transient, Task 11-3.29
for roll transient, or Task 11-3.30 for yaw transient.
32. Move pilot's directional pedals right, then left. Return
No. 2 yaw ILCA output shaft shall extend with pedal right
pedals to center.
and retract with pedal left. If No. 2 yaw ILCA output shaft
does not extend or retract, go to Task 11-3.31.
33. Move pilot's pitch and roll control stick right, then
No. 2 roll ILCA output shaft shall extend with stick right
left. Return grip to center.
and retract with stick left. If No. 2 roll ILCA output shaft
does not extend or retract, go to Task 11-3.32.
34
Momentarily set pilot's pitch and roll trim switch (40)
No. 2 roll ILCA output shaft shall extend when switch (40)
right then left. Release switch.
is right and retract when switch is left. If No. 2 roll ILCA
output shaft does not extend or retract, go to Task
11-3.33.
34.1 Momentarily set copilot's pitch and roll trim switch
No. 2 roll ILCA output shaft shall extend when switch (40)
(40) right then left. Release switch.
is right and retract when switch is left. If No. 2 roll ILCA
output shaft does not extend or retract, go to Task
11-3.33.
35. Press and hold pilot's CENTERING DEVICE RELEASE
switch (25). Center pilot's pitch and roll control stick
and directional pedals. Release CENTERING DEVICE
RELEASE switch.
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11-54 Change 23
