(aa) Make sure the pressure from hydraulic systems A, B, and Standby are released. (ab) Remove the lock on the standby hydraulic module (Fig. 201): 1) Connect the electrical connector from the leading edge devices shutoff valve at the standby hydraulic module.
2) Make sure the override lever at the leading edge devices shutoff valve is in position 1 (leading edge flaps and slats retracted).
3) Remove the lock on the shutoff valve.
4) Remove the lockpin.
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737-300/400/500MAINTENANCE MANUAL
(ac) Supply electrical power (AMM 24-22-00/201).
(ad) Set the alternate flap arm switch to ARM.
(ae) Make sure the low pressure light of the standby hydraulic
system is off.
(af) Monitor the leading edge flaps and slats for 60 seconds.
NOTE: The leading edge flaps can slowly extend because of
____
gravity.
(ag) Make sure the flaps and slats do not extend.
(ah) Set the alternate flap arm switch to OFF.
(ai) Remove electrical power (AMM 24-22-00/201).
(aj) Remove "DO NOT DRIVE MOTOR ENGINE WITH THE THRUST REVERSER
COWLS OPEN" placard from engine start switch, if it is not
necessary.
F. Procedure
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S 862-051
WARNING: MAKE SURE THE INBOARD AND OUTBOARD FAN DUCT COWLS AND THE
_______ THRUST REVERSERS ARE CLOSED OR REMOVED IF YOU NEED TO EXTEND THE LEADING EDGE FLAPS AND SLATS. THERE IS NOT SUFFICIENT CLEARANCE FOR THE LEADING EDGE FLAPS AND SLATS TO EXTEND IF THE INBOARD AND OUTBOARD FAN DUCT COWLS AND THE THRUST REVERSERS ARE IN THE OPEN (MAINTENANCE) POSITION. THIS CAN CAUSE DAMAGE TO EQUIPMENT.
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LEADING
_______ EDGE FLAPS AND SLATS. IF YOU MOTOR THE ENGINES IT CAN CAUSE EXTENSION OF THE LEADING EDGE FLAPS AND SLATS BECAUSE OF PRESSURIZATION OF HYDRAULIC SYSTEMS A OR B. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT. PUT A "DO NOT DRY MOTOR ENGINE WITH THE THRUST REVERSER COWLS OPEN" PLACARD ON THE ENGINE START SWITCH."
WARNING: MAKE SURE LEADING EDGE FLAPS, LEADING EDGE SLATS, AND TRAILING
_______ EDGE FLAPS ARE IN THE FULL (UP) RETRACTED POSITION AND THE POWER TRANSFER UNIT, HYDRAULIC SYSTEM B, AND THE STANDBY SYSTEMS ARE DEACTIVATED BEFORE YOU MOTOR THE ENGINES. DO NOT MOTOR THE ENGINES WITH THE TRAILING EDGE FLAP EXTENDED. IF YOU DO, THE SLATS WILL BE ACTIVATED AND EXTENDED BY HYDRAULIC POWER ORIGINATED FROM THE (HYDRAULIC SYSTEM B) ENGINE DRIVEN PUMP AND CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
WARNING: MAKE SURE THE POSITION OF THE FLAPS AND SLATS AGREES WITH THE
_______ POSITION OF THE FLAP CONTROL LEVER. WHEN YOU PRESSURIZE THE HYDRAULIC SYSTEM B, THE FLAPS AND SLATS WILL MOVE AUTOMATICALLY TO THE POSITION OF THE FLAP CONTROL LEVER. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(1)
Leading Edge Flaps and Slats Deactivation to operate the Trailing Edge Flaps in the alternate (fully electric) mode, with hydraulic power system A pressurized and hydraulic power system B and Standby released. Do the steps that follow:
(a)
Put a "DO NOT DRY MOTOR ENGINE WITH THE THRUST REVERSER COWLS OPEN" placard on engine start switch to prevent engine dry motoring with the thrust reverser cowls open, and to prevent uncommanded slat extension caused by (EDP) Engine Driven Pump pressurization of hydraulic system B.
(b)
Pressurize the hydraulic system A (AMM 29-09-00/201).
(c)
Make sure the hydraulic system B and Standby are released (AMM 29-09-00/201).
(d)
Make sure the leading edge flaps, leading edge slats, and trailing edge flaps are in the full (UP) retracted position.
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