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A
747-400 MAINTENANCE MANUAL
 S 862-100
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LEADING
_______ EDGE FLAPS BEFORE YOU SUPPLY PNEUMATIC POWER. IF THE LE FLAPS ARE EXTENDED AND THE TE FLAPS ARE RETRACTED, THE LE FLAPS WILL RETRACT WHEN YOU SUPPLY PNEUMATIC POWER. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (6)  
Do this task: "Supply Pneumatic Power" (AMM 36-00-00/201).

 S 862-101

 (7)  
Do this task to pressurize hydraulic systems No. 1 and 4:
 "Hydraulic System Pressurization" (AMM 29-11-00/201).

 

 NOTE: Hydraulic power is not necessary if TE flaps are extended 5
____ unit and you use the reverse thrust levers to operate the LE flaps.
 S 712-162
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE FLAPS
_______ BEFORE YOU MOVE THE REVERSE THRUST LEVERS. THE ENGINE THRUST REVERSER SLEEVES WILL OPEN IN 1 1/2 SECONDS AND CLOSE IN 4 1/2 SECONDS WHEN YOU OPERATE THE LEVERS. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 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. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (8)  
Do a check on the operation of the LE flaps:

 (a)  
Put the flap control lever in the 5 unit detent.

 (b)  
Put the flap control lever to the full UP detent.

 (c)  
Make sure the LE flaps retract fully after the TE flaps are retracted.

 F.
Put the Airplane Back to Its Usual Condition

 S 862-103
 (1)  
Do this task if hydraulic power is not necessary for hydraulic systems No. 1 and 4: "Hydraulic Power Depressurization" (AMM 29-11-00/201).

 S 862-104

 (2)  
Do this task if pneumatic power is not necessary: "Pneumatic Power Removal" (AMM 36-00-00/201).

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 27-81-03
 ALL  ú ú 02 Page 238 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 862-105
 (3)  Do this task if electrical power is not necessary: "Electrical Power Removal" (AMM 24-22-00/201).
 TASK 27-81-03-002-106
 10. Alternate Solenoid Valve Removal________________________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 27-81-00/201, Leading Edge Flap System

 (3)  
AMM 36-00-00/201, Pneumatic System

 (4)  
AIPC 27-81-03, Fig. 1

 (5)  
SSM 27-81-01, SSM 27-81-02, SSM 27-81-03, SSM 27-81-04, SSM 27-81-05, SSM 27-81-06

 (6)  
WDM 27-51-21, WDM 27-51-22, WDM 27-81-11, WDM 27-81-12, WDM 27-81-21, WDM 27-81-22, WDM 27-81-31, WDM 27-81-32, WDM 27-81-41, WDM 27-81-42, WDM 27-81-81, WDM 27-81-82

 B.
Access

 (1)  
Location Zone
 512 Krueger Flap Inboard, LH
 523 Variable Camber Flap, LH
 525 Variable Camber Flap, LH
 535 Variable Camber Flap, LH
 612 Krueger Flap Inboard, RH
 623 Variable Camber Flap, RH
 625 Variable Camber Flap, RH
 635 Variable Camber Flap, RH

 C.
Prepare for Removal

 S 862-107
 (1)
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P6 Main Power Distribution Panel 1) 6L21 LE FLAP ELEC CONT GRP B DRIVE 1 2) 6L22 LE FLAP ELEC CONT GRP A DRIVE 2 3) 6L23 LE FLAP ELEC CONT GRP A DRIVE 3 4) 6L24 LE FLAP ELEC CONT GRP A DRIVE 4 5) 6E3 PRIM LE FLAP CONT GRP A AC 6) 6E4 PRIM LE FLAP CONT GRP A DC 7) 6E5 PRIM LE FLAP CONT GRP B AC 8) 6E6 PRIM LE FLAP CONT GRP B DC

 (b)  
P7 Overhead Circuit Breaker Panel 1) 7C10 FLT CONT ELEC 2L-AC 2) 7C11 FLT CONT ELEC 2L-DC 3) 7C12 FLT CONT ELEC 1L-AC 4) 7C13 FLT CONT ELEC 1L-DC 5) 7C14 FLT CONT ELEC 1R-AC 6) 7C15 FLT CONT ELEC 1R-DC 7) 7C16 FLT CONT ELEC 2R-AC

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