(b)
Select the electric and air driven pump switches, as applicable to the ON position, on the overhead Hydraulic Control Panel. 1) Use the APU to supply air to run the air driven hydraulic
pumps.
(c)
Leave the electric motor pumps and air driven pumps, as applicable running until the engine-driven pumps are operating.
(d)
If the hydraulic pressure in one system increases, then drops to zero, do the steps that follow:
NOTE:____Repeat the steps a maximum of three times. After three times (cycles), you must find the cause of the pressure drop.
1) Turn the electric motor pump OFF.
2) Turn the electric motor pump ON.
S 863-048
(8) Do the functions of the flight control systems that follow:
(a) Slowly (1 to 2 seconds), move the control column, wheel, rudder pedals, and the ground spoilers.
NOTE: You must complete at least 10 cycles of each control to
____
near full travel.
1) Verify that the movement of the flight control systems are normal on EICAS.
(b)
Run the stabilizer trim full travel nose up and nose down using the column trim switch.
(c)
Select the flaps to the full down position.
NOTE: Wait for the flaps to reach the full down position.
____
(d) Select the flaps to the full up position.
NOTE: Wait for the flaps to reach the full up position.
____
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(e)
(f)
A
747-400 MAINTENANCE MANUAL
Prepare for the autopilot check (AMM 22-10-00/501). 1) Set the autopilot stab trim cutout switch, on the control stand, to the CUTOUT position.
WARNING:_______ KEEP PERSONS AND EQUIPMENT AWAY FROM THE FLIGHT
CONTROL SURFACES. THE AILERONS, ELEVATORS, RUDDER,
FLAPS, SLATS, SPOILERS, STABILIZER AND NOSE GEAR CAN
MOVE SUDDENLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS
CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
2) Make sure hydraulic power is applied to systems A and B. To supply hydraulic power (AMM 29-11-00/201). NOTE: Hydraulic power is necessary for surface test.
____Operate the autopilot servos as follows: 1) Engage one autopilot channel. 2) Engage vertical speed mode.
a) Select vertical speed of 2000 fpm.
NOTE: Wait for the column motion to stop.
____ b) Select vertical speed of -2000 fpm. NOTE: Wait for the column motion to stop.
____
3) Engage heading select mode. a) Select 30 degree heading change to the left of the airplane heading.
NOTE: Wait for wheel motion to stop.
____
b) Select 30 degree heading change to the right of the airplane heading. NOTE: Wait for wheel motion to stop.
____ 4) Repeat steps 1 thru 3 for the other two autopilot channels.
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A
747-400 MAINTENANCE MANUAL
S 863-049
(9) At temperatures below -22°F (-30°C) pump the brake pedal (8) times shortly before starting the engines. At each wheel, verify extension/retraction of brake pistons.
(a) If brake operation is not normal, do the steps that follow (AMM 32-41-00/201 and AMM 32-42-02/201): 1) Provide local warming to the brake. 2) Repeat the test until proper operation is observed. 3) If the difficulty persists, replace the brake (AMM
(AMM 32-41-15/401).
S 203-050
(10)
Inspect the wheel wells for ice/snow/slush on the Alternate Landing Gear System Components. Clear as necessary.
S 603-051
(11)
Fill the IDG with oil as required (AMM 12-13-07/301).
NOTE: If the IDG is serviced for cold weather operation, use the
____ preferred oil, MIL-L-7808 lubricant instead of MIL-L-23699 lubricant. The only MIL-L-7808 lubricant approved for Sundstrand IDGs is Exxon 2389.
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