757 AMM 飞机维护手册 SERVICING 2(102)

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 2) Remove the heating hoses in the Main Equipment Center
 Access Panel, 119BL.
 3) Make sure the main equipment center bay door 119BL is
 closed.
 4) Remove the heating hose in the Forward Equipment Bay Access
 Panel, 113AL.
 5) Make sure the forward equipment bay door 113AL is closed.
 (c)  Make sure the outflow valves are in the OPEN position.
 (d)  Close the battery bus circuit breakers.
 (e)  Start the APU with the battery or ground power (AMM
 49-11-00/201) .
 NOTE: To improve starting capability of the APU at____
 temperatures below -40°F (-40°C), it may be desirable to
 use low viscosity oil (MIL-L-7808).
 The EICAS may indicate low APU oil quantity for the
 first 5 minutes after the APU start or until the APU has
 warmed up.
 (f)  Make sure the recirculation fan switches are in the ON
 position.
 (g)  Close the pack and zone circuit breakers if they are open.
 (h)  Put all zone selectors in the 12 o'clock position.
 (i)  Make sure the Trim Air switches are ON.
 (j)  Turn the left and right pack switches to AUTO (AMM
 21-00-00/201).

 S 863-112
 CAUTION: DO NOT CYCLE THE CONTROL COLUMN, WHEEL, RUDDER PEDALS, BRAKE
_______ PEDALS, GROUND SPOILERS, STABILIZER OR FLAPS UNTIL THE PUMPS HAVE RUN FOR AT LEAST 15 MINUTES.
 (8)  Turn on the hydraulic system electric motor pumps 30 minutes before starting the engines.
 NOTE: This will make sure the hydraulic system operates normally
____ and will prolong the life of the components.
 (a)  
Use alternating current motor pump to pressurize the main hydraulic system (AMM 29-11-00/201).

 (b)  
Select these electric and air driven pump switches to the ON position, on the overhead Hydraulic Control Panel. 1) HYD PUMPS C ELEC 1 2) HYD PUMPS C ELEC 2 3) HYD PUMPS L ELEC 4) HYD PUMPS R ELEC

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MAINTENANCE MANUAL

 (c)  
Leave the motor pumps running until the engine-driven pumps are operating.

 (d)  
If the hydraulic pressure in one system increases, then drops to zero, do these steps:

 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 863-113
 (9)  Do these functions of the flight control systems:
 (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) You must complete at least 10 cycles of each control to near full travel. 2) 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 and wait for the flaps to reach the full down position.

 (d)  
Select the flaps to the full up position and wait for the flaps to reach the full up position.

 (e)  
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 the the left and right hydraulic systems (AMM 29-11-00/201).
 (f)  Operate the autopilot servos:
 1) Engage one autopilot channel.
 2) Engage vertical speed mode.

 a)  Select vertical speed of 2000 fpm and wait for the column motion to stop. b) Select vertical speed of -2000 fpm and wait for the column motion to stop.
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