TM 55-1520-240-T
11-3.3 AFCS OPERATIONAL CHECK (Continued)
11-3.3
TASK
RESULT
CHECK LONGITUDINAL CYCLIC TRIM ACTUATOR CONTROL
42. Set CYCLIC TRIM AUTO MANUAL
switch (37) to MANUAL.
43. Set and hold FWD switch (45) to EXT.
FWD CYC TRIM indicator (38) pointer shall move
from GND to EXT position. If it does not, go to
task 11-3.35.
44. Set and hold FWD switch (45) to RET.
FWD CYC TRIM indicator (38) pointer shall move
from EXT to RET position. If it does not, go to task
11-3.35.
45. Release FWD switch (45). Set and hold
AFT CYC TRIM indicator (39) pointer shall move
AFT switch (46) to EXT.
from GND to EXT position. If it does not, go to
task 11 -3.36.
46. Set and hold AFT switch (46) to RET.
AFT CYC TRIM indicator (39) pointer shall move
from EXT to RET position. If it does not, go to task
11-3.36.
47. Release AFT switch (46).
48. Set CYCLIC TRIM AUTO MANUAL
Pointers on FWD and AFT CYC TRIM indicators
switch (37) to AUTO.
(38 and 39) shall move to GND positions.
CHECK HDG, RAD ALT, AND BARO ALT SWITCHES
49. Check that SYSTEM SEL switch (26) is at
If not, set it to BOTH.
BOTH.
50. Press and hold HDG switch (47).
HDG switch (47) ENGAGED caption shall come
on. If not, go to task 11-3-37.
51. Release HDG switch (47).
52. Press and release RAD ALT switch (48).
RAD ALT switch (48) ENGAGED caption shall
come on and stay on. If not, go to task 11 -3.38.
TASK
RESULT
53. Press and release BARO ALT switch
RAD ALT switch (48) ENGAGED caption shall go
(49).
out. BARO ALT switch (49) ENGAGED caption
shall come on. If not, go to task 11-3.38.
54. Set SYSTEM SEL switch to position 1, then
BARO ALT switch (49) ENGAGED caption shall
to OFF.
go out. If not, replace AFCS control panel.
CHECK LONGITUDINAL COCKPIT CONTROL DRIVER ACTUATOR
55. Set and hold pilot's pitch and roll trim
Pitch and roll control sticks shall move forward. If
switch (40) forward.
not, go to task 1 1-3-39.
56. Set and hold pilot's pitch and roll trim
Pitch and roll control sticks shall move aft. If not,
switch (40) aft.
go to task 11 -3.39.
57. Repeat steps 55 and 56 using copilot's pitch
and roll trim switch (40).
NOTE
If a problem with AFCS occurred during flight
and could not be verified by the AFCS
operational check, refer to table 11-3.2 to
locate trouble symptom task number.
TABLE 11-3.1
BITE TEST NUMBER
TASK NO. OR
MAINTENANCE ACTION
4, 5, 7, 8, 10-17, 19-47, 49-69................................................................ Replace computer
75-84, 88, 90-94, 96-127. ......................................................................
6, 9, 18........................................................................................... 11-3.40
48 .................................................................................................. 11 -3.41
70-74 ............................................................................................. 11-3.42
85, 86............................................................................................. 11-3.43 or 11-3.44
87 ..................................................................................................
11-3.45
89 .................................................................................................. 11-3.46 or 11-3.47
95 ..................................................................................................
11-3.48
D145-11910- SPA
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11-58 Change 2
