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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (b)  
3MIT65B40500-1 - Adapter Assembly, Lamb Air Mover

 (c)  
6MIT65B00112 - Adpater - Fuel Tank Ventilation

 (d)  
Lamb Air Mover DP 32119 - Venturi 3-inch diameter, Mine Safety Appliances Company Pittsburgh, Pennsylvania, USA

 D.
Access

 (1)  
Location Zones
 130 Center Section Wing Box
 500 Left Wing
 600 Right Wing

 (2)  
Access Panels
 131AZ Spanwise Beam Access Door
 131BZ Spanwise Beam Access Door
 131CZ Spanwise Beam Access Door
 131DZ Spanwise Beam Access Door
 131EZ Center Wing Tank Access Door
 132AZ Spanwise Beam Access Door
 132BZ Spanwise Beam Access Door
 339AZ Access Door
 349AZ Access Door
 544AB Fuel Tank Access Door
 545BB Fuel Tank Access Door
 546BB Fuel Tank Access Door
 552GB Fuel Tank Access Door
 553AB Fuel Tank Access Door
 553KB Fuel Tank Access Door
 556AB Surge Tank Access Door
 644AB Fuel Tank Access Door
 645BB Fuel Tank Access Door
 646BB Fuel Tank Access Door
 652GB Fuel Tank Access Door
 653AB Fuel Tank Access Door
 653KB Fuel Tank Access Door
 656AB Surge Tank Access Door

 E.
Prepare the Airplane for Fuel Tank Purging

 S 942-426
 WARNING:_______OBEY THE PURGING AND FUEL TANK ENTRY PRECAUTIONS. FAILURE TO OBEY THE PURGING AND FUEL TANK ENTRY PRECAUTIONS CAN CAUSE SERIOUS INJURY OR DEATH TO PERSONS AND CAN CAUSE DAMAGE TO EQUIPMENT.
 (1)  Read and obey the precautions in this task: Purging and Fuel Tank Entry Precautions.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-11-00
 ALL  ú ú 04 Page 228 ú Jun 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (2)  S 652-516Do these tasks to defuel the applicable fuel tank(s): (a) Lateral Fuel Imbalance (AMM 28-26-00/201). (b) Pressure Defueling (AMM 28-26-00/201).
 (3)  S 652-428Drain the fuel tank sumps (AMM 12-11-03/301).
 (4)  S 942-429Make sure the airplane is correctly grounded to an approved and identified ground (AMM 20-41-01/201).
 S 492-430

 WARNING: DO THE DEACTIVATION PROCEDURE FOR THE TRAILING EDGE FLAPS.
_______ ACCIDENTAL OPERATION OF THE TRAILING EDGE FLAPS COULD CAUSE INJURY TO PERSONS.
 (5)  Do the deactivation procedure for the trailing edge flaps (AMM 27-51-00/201).
 S 492-431
 WARNING: DO THE DEACTIVATION PROCEDURE OF THE LEADING EDGE FLAP
_______ (AMM 27-81-00/201). IF THE LEADING EDGE FLAP OPERATES ACCIDENTALLY, IT CAN CAUSE INJURY.
 (6)  
Do the deactivation procedure of the leading edge flaps (AMM 27-81-00/201).

 S 492-432

 (7)  
Make sure the downlocks are installed on the nose and main landing gear (AMM 09-11-00/201).

 S 492-433
 WARNING: USE THE PROCEDURE IN AMM 32-00-30/201 TO INSTALL THE DOOR
_______ LOCKS. THE DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (8)  
Open the doors for the landing gear and install the door locks (AMM 32-00-30/201).

 S 942-434

 (9)  
Put ropes around the airplane to identify the hazardous location areas (Figure 201), and attach these signs with words you can see clearly written on both sides:

 (a)  
DANGER - OPEN FUEL TANKS - NO SMOKING

 (b)  
AUTHORIZED PERSONNEL ONLY

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