(2)  
28-11-09/401, Spanwise Beam Access Door

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-13-02
 ALL  ú ú 04 Page 408 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

FUEL VENT FLOAT VALVE
NOTE:____  LEFT WING IS SHOWN; 
RIGHT WING IS  SEE  A 
ALMOST THE SAME. 

FUEL VENT FLOAT VALVE
SEE A
VENT TUBE
1. FLOAT ASSEMBLY
VENT TUBE 2. TEFLON WASHER (2 LOCATIONS)
4. WASHER (2 LOCATIONS)
3. HINGE PIN
VENT TUBE
FUEL VENT FLOAT VALVE
A
VENT TUBE
FUEL VENT FLOAT VALVE
SEE A
VALVE FLANGE
Fuel Vent Float Valve Poppet and Float Assembly Installation
Figure 402

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-13-02
 ALL  ú ú 06 Page 409 ú Jun 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 C. Access
 (1)  
Location Zones 131 Center Section Wing Box, Left 132 Center Section Wing Box, Right 542 Inbd Main Tank (Part), Front Spar to Mid Spar, Left 544 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 552 Outbd Main Tank (Part), Mid Spar to Rear Spar, Left 553 Reserve Tank, Front Spar to Rear Spar, Left 642 Inbd Main Tank (Part), Front Spar to Mid Spar, Right 644 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right 652 Outbd Main Tank (Part), Mid Spar to Rear Spar, Right 653 Reserve Tank, Front Spar to Rear Spar, Right

 (2)  
Access Panels
 131AZ Spanwise Beam Access Door
 131BZ Spanwise Beam Access Door
 131CZ Spanwise Beam Access Door
 131DZ Spanwise Beam Access Door
 132AZ Spanwise Beam Access Door
 132BZ Spanwise Beam Access Door
 552AB Fuel Tank Access Door
 552FB Fuel Tank Access Door
 652AB Fuel Tank Access Door
 652FB Fuel Tank Access Door

 D.
Procedure

 S 214-025
 CAUTION: MAKE SURE THE PART NUMBER OF THE POPPET AND FLOAT ASSEMBLY IS
_______ CORRECT BEFORE THE REPLACEMENT. FLOAT ASSEMBLY COMPONENTS MUST ALIGN BY THE PART NUMBER TO MAKE SURE IT OPERATES CORRECTLY.
 (1)  
Examine the float assembly (1) for damage and worn areas and replace it if it is necessary.

 S 424-026

 (2)  
Put the float assembly (1) and teflon washers (2) in their positions to make sure the holes in the float arm bracket align with the holes in the valve flange bracket.

 (3)  
Move the hinge pin (3) through the holes that align.

 (4)  
Put a washer (4) on each end of the hinge pin (3).

 (5)  
Install lockwire on the hinge pin (3).

 S 434-027
 S 434-036
 S 434-037
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-13-02
 ALL  ú ú 04 Page 410 ú Jun 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
 (6)  S 714-028Lift the float assembly (1) lightly to make sure the float arm moves freely.
 (7)  S 224-029Measure the distance between the top seal surface on the valve flange and the top point on the flapper.
 NOTE:____ This dimension must be 0.84 to 1.00 inch.
 (a)  If the clearance is too much or not in the tolerance, make sure you installed the correct float assembly (1).
 (8)  S 414-030Install the spanwise beam access doors, if removed (Ref 28-11-09/401).
 (9)  S 864-031Go out of and close the fuel tank (Ref 28-11-00/201).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
　
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機維護手冊 燃油 FUEL 1(142)