one or the other direction.
(k)
Put the STAB TRIM ALTN switches on the control stand to APL NOSE UP and then to APL NOSE DN. 1) Make sure that there is no movement of the stabilizer in
one or the other direction.
(l)
Set the STAB TRIM 2 and 3 switches to ON.
(m)
Do this check five times: 1) Hold the STAB TRIM switches on the captain's control wheel to the NOSE UP position for three seconds. 2) Make sure the stabilizer starts to move in less than one
second. 3) Make sure the stabilizer moves smoothly. 4) Release the STAB TRIM switches. 5) Make sure the stabilizer stops in less than one second.
(n)
Do this check five times: 1) Hold the STAB TRIM ALTN switches on the control stand to the APL NOSE DN position for three seconds.
2) Make sure the stabilizer starts to move in less than one second.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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747-400 MAINTENANCE MANUAL
3) Make sure the stabilizer moves smoothly.
4) Release the STAB TRIM ALTN switches.
5) Make sure the stabilizer stops in less than one second.
(o) Put the STAB TRIM switches on the first officer's control wheel to NOSE UP and then quickly to NOSE DN.
NOTE: This will let the stabilizer move at the full speed
____ before it changes direction.
1) When the switch position changes, make sure the stabilizer moves in the opposite direction in less than one second. 2) Make sure the stabilizer operates smoothly.
G. Do a Test for the Travel Limits of the Captain's Stabilizer Trim with the Landing Gear Retraction Simulated
S 865-079
(1) Make sure the leading edge flaps are retracted (AMM 27-81-00/201).
S 865-077
WARNING: YOU MUST CAREFULLY FOLLOW THE STEPS IN THE REFERENCED TASK TO
_______ PREPARE THE SAFETY SENSITIVE SYSTEMS FOR THE AIR MODE. FAILURE TO FOLLOW THE STEPS CORRECTLY CAN CAUSE THE AUTOMATIC OPERATION OF THE AIRPLANE SYSTEMS. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(2)
Do the "Prepare Safety-Sensitive Systems for Air Mode Simulation" task (AMM 32-09-02/201).
S 865-078
(3)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P7, Overhead Circuit Breaker Panel
1) 7F22, LANDING GEAR DSP & CONT PRI
2) 7F23, LANDING GEAR DSP & CONT ALTN
S 735-038
(4)
Do a test for the travel limits of the captain's stabilizer trim with the landing gear retraction simulated:
(a)
Set the STAB TRIM 2 switch to CUTOUT.
(b)
Hold the STAB TRIM switches on the captain's control wheel to the NOSE UP until the stabilizer stops.
(c)
Set the STAB TRIM 3 switch to CUTOUT.
(d)
Make sure the "B" dimension is 26.91 |0.60 inches
(683.5 |15.2 millimeters).
(e)
Make sure the stabilizer position indicators show 11.60 | 0.25 units of trim.
(f)
Set the STAB TRIM 3 switch to ON.
(g)
Hold the STAB TRIM ALTN switches to the APL NOSE UP position until the stabilizer stops.
(h)
Set the STAB TRIM 3 switch to CUTOUT.
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747-400 MAINTENANCE MANUAL
(i) Make sure the "B" dimension is 34.03 |0.33 inches
(864.4 |8.4 millimeters).
(j)
Make sure the stabilizer position indicators show 14.75 | 0.25 units of trim.
(k)
Set the STAB TRIM 3 switch to ON.
(l)
Hold the STAB TRIM switches on the captain's control wheel to NOSE DN until the stabilizer stops.
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