29-11-00
 ALL  ú ú 01 Page 680D ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 016-300
 (4)  Open the doors on the trailing edge fairing (AMM 54-62-00/201). S 866-677
 WARNING:_______ MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
 FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP
 CONTROL LEVER.  WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL
 MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP

 CONTROL LEVER.
 (5)  
Extend the trailing edge flaps (AMM 27-51-00/201).

 S 866-303

 (6)  
Put the landing gear handle in the DOWN position.

 S 216-717
 WARNING: DO NOT TOUCH PNEUMATIC DUCTS WHILE EXAMINING HYDRAULIC LINES.
_______ THE PNEUMATIC DUCTS MAY BE HOT AND CAUSE INJURY TO PERSONS.
 (7)  
Examine all hydraulic lines in the wheel wells for the landing gear, wing rear spar, and trailing edge fairing for leakage.

 S 216-471

 (8)  
Examine all external drains from the engine area, the stablizer area and the fuselage area for signs of hydraulic fluid leakage (AMM 51-41-01/601 for the locations of all external drains.)

 S 216-305

 (9)  
Examine the hydraulic lines between the demand pumps, pressure modules, and case drain modules for signs of hydraulic fluid leakage.

 S 796-306

 (10)
 Examine the hydraulic lines between the auxiliary pump, pressure module, and case drain module for signs of hydraulic fluid leakage.

 S 866-472

 (11)
 If there are signs of leakage, pressurize the hydraulic system to isolate the leak source (AMM 29-11-00/201).

 S 866-307

 (12)
 Release the pressure in the hydraulic system (AMM 29-11-00/201).

 (13)
 Repair the cause of the leakage.

 S 366-473
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-11-00
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747-400 MAINTENANCE MANUAL
 S 166-474
 (14)
 Remove all hydraulic fluid from titanium structure (AMM 05-51-12/201).

 S 976-477

 (15)
 Examine the leakage rates as shown in Figure 610.

 S 866-678

 (16)
 Retract the trailing edge flaps (AMM 27-51-00/201).

 WARNING:_______ MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
 FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP
 CONTROL LEVER.  WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL
 MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP
 CONTROL LEVER.

 S 096-310
 WARNING:  REFER TO AMM 32-00-30/201 FOR THE REMOVAL PROCEDURE FOR THE LOCKS ON THE LANDING GEAR DOORS. SUDDEN MOVEMENT OF THE LANDING GEAR DOORS CAN CAUSE INJURY AND DAMAGE.
 (17)
 Remove the locks on the landing gear doors and close the landing gear doors (AMM 32-00-30/201).

 S 866-312

 (18)
 Release the pressure in the hydraulic systems if it is not necessary (AMM 29-11-00/201).

 S 866-313

 (19)
 Remove electrical power if it is not necessary (AMM 24-22-00/201).

 S 216-493

 (20)
 Examine the doors on the trailing edge fairing.

 (a)  
Examine the trailing edge fairing door latches for cracks and wear.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-11-00
 ALL  ú ú 01 Page 680F ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

leaking, allow a minimum of 15 minutes after landing to permit fluid collected inside shroud to drain out before checking leakage ratio.
These leakage limits do not apply to landing gear brake assemblies. Refer to AMM 32-41-15 for brake examination details.
Allowable External Leakage Chart
　
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