TM 55-1520-240-T
11-3.3 AFCS OPERATIONAL CHECK (Continued)
11-3.3
TASK
RESULT
WARNING
Keep head, hands, and other body parts
clear of flight controls, especially those in
flight controls closet. AFCS BITE automat-
ically causes actuator and controls mo-
tion. Severe injury can occur.
36. Set NO. 1 ENGINE CONDITION lever (35) to
FLIGHT.
37. Press and release NO. 2 AFCS computer BITE
Computer digital test counter (44) shall remain
switch (43).
blank. BITE switch (43) shall not flash. If counter
does not remain blank or BITE switch flashes, go to
task 11-3.25.
38. Set NO. 1 ENGINE CONDITION lever (35) to
STOP. Set NO. 2 ENGINE CONDITION lever
(36) to FLIGHT. Repeat step 37 then go to
step 39.
39. Set NO. 2 ENGINE CONDITION lever (36) to
STOP.
40. Press and release BITE switch (43).
Computer counter (44) shall step and display from 1
through 3 and stop at 3. BITE switch (41) shall light
and flash while display is stopping and then glow
steadily after display indicates 3. If display is blank
and BITE switch does not light, go to task 11-3.34. If
counter steps to and stops at 3 but BITE switch
does not light, replace NO. 2 AFCS computer. If
BITE switch lights but display stops at 1 or 2, repeat
operational check task 11-3.2. If same result occurs,
replace NO. 2 AFCS computer.
41. Press and release BITE switch (43).
Computer counter (44) shall step and display from 4
through 95 (end of test) and go blank. BITE switch
shall flash while display is stepping. If BITE switch
lights steadily, and counter stops at an intermediate
number, record that number. Push BITE switch to
continue test. Go to table 11-3.1 to determine main-
tenance action. At end of test, counter shall go
blank and BITE switch light shall go out. If BITE
switch lamp flashes at step 95, the PUSH TO TEST
switch on the Pilots or Copilots radar altimeter indi-
cator must be actuated within 20 seconds in order
to avoid a false failure indication.
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