27-81-03
 ALL  ú ú 04 Page 247 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 712-143
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE TRAILING
_______ EDGE AND THE LEADING EDGE FLAPS. THE TRAILING EDGE AND THE LEADING EDGE FLAPS WITH THE POWER DRIVE UNIT CONNECTED WILL MOVE. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (9)  
Move the flap control lever from the full UP detent to the 5 unit detent to operate the PDU and the LE flaps.

 (a)  
Make sure that the LE flaps extend fully.

 S 712-160
 (10)
 Move the flap control lever to the full UP detent.

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

 E.
Put the Airplane Back to Its Usual Condition

 S 862-144
 (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 862-145

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

 S 862-146

 (3)  
Do this task if electrical power is not necessary: "Electrical Power Removal" (AMM 24-22-00/201).

 TASK 27-81-03-962-147
 14. LEFDU Observation Window Assembly Removal_________________________________________
 A. Standard Tools and Equipment
 (1)  
Screwdriver

 B.
References

 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 29-11-00/201, Main Hydraulic Supply System

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

 (4)  
AIPC 27-81-03-03, Fig. 3

 (5)  
Allied Signal Aerospace CMM 27-81-11 (126762)

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 27-81-03
 ALL  ú ú 04 Page 248 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 C. 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

 D.
Prepare for Removal

 S 482-197
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE LE FLAP SAFETY LOCKS. THE LE FLAPS CAN MOVE QUICKLY IF YOU DO NOT INSTALL THE SAFETY LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)  
Do this task: "Extended Leading Edge Flap Deactivation and Safety Lock Installation" (AMM 27-81-00/201).

 S 862-198

 (2)  
Do this task: "Electrical Power Removal" (AMM 24-22-00/201).

 S 862-199

 (3)  
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
 8) 7C17 FLT CONT ELEC 2R-DC

 (c)  
P414 Power Distribution Center - Left
 1) 414A5 LE FLAP ELEC DRIVE 1

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