S 864-030
 (4)  
Make sure the crossfeed valve(s) are closed.

 S 654-003

 (5)  
Drain and purge the center fuel tank (AMM 28-11-00/201).

 S 014-004

 (6)  
To remove the discharge check valve of the fuel boost pumps, remove the applicable center tank access door, 531AB or 631AB (AMM 28-11-02/401).

 S 014-005

 (7)  
To remove the discharge check valve of the fuel override pumps, remove the center tank access door, 134AZ (AMM 28-11-02/401).

 S 944-027
 WARNING: OBEY THE FUEL TANK ENTRY PRECAUTIONS (AMM 28-11-00/201).
_______ FAILURE TO OBEY THE FUEL TANK ENTRY PRECATUIONS COULD CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (8)  
Obey the fuel tank entry precautions (AMM 28-11-00/201).

 S 014-006

 (9)  
To remove the discharge check valves of the fuel override pumps, remove the baffle doors, 134BZ, 134CZ, and 134DZ (AMM 06-41-00/201).

 S 034-009

 (10)
 Remove the nut (17), the ring (15), and the O-ring (16) at the pressure sensor line (1).

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 28-22-09
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A

757
MAINTENANCE MANUAL

 S 034-010
 (11) Remove the four screws (6), the washers (3), the nuts (2) and one O-ring (5) from the valve flange (4).
 NOTE: This disconnects the discharge check valve (8) from
____
 the pump discharge line (7).

 S 034-011
 (12)
 Remove the four bolts (24), washers (11), and nuts (10) from the discharge check valve (8).

 S 024-012

 (13)
 Remove the discharge check valve (8).

 S 034-013

 (14)
 Remove the O-ring (14).

 TASK 28-22-09-404-014
 3. Install the Discharge Check Valve (Fig. 401)
_________________________________
 A. Parts
 ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 2 | Nut | 28-22-03 | 02 | 255 | | | 3 | Washer | | | 250 | | | 5 | O-ring | | | 265 | | | 6 | Screw | | | 240,245 | | | 8 | Discharge Check Valve | 28-22-03 | 03 | 625 | | | 10 | Nut | | | 675 | | | 11 | Washer | | | 77,670 | | | 14 | O-ring | | 01 | 685 | | | 15 | Ring | | | 255 | | | 16 | O-ring | | | 260 | | | 17 | Nut | | | 250 | 2......…........…...................................…..........….....….........1
　
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本文鏈接地址：757 AMM 飛機維護手冊 燃油 CHAPTER 28 - FUEL 3(90)