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757
MAINTENANCE MANUAL
(8) S 214-063Make sure the FWD and AFT flowbars go off.
(9) S 214-064Make sure the FWD and AFT VALVE lights come on and then go off.
S 214-099
(10) Do a check on each manual override handle position to make sure the forward and aft engine fuel crossfeed valves are closed.
NOTE: Access to the forward and aft engine fuel crossfeed valve
____ actuators is in the right and left wheel wells repectively.
The forward engine fuel crossfeed valve is found approximately 4 inches to the right of the middle of the body on the center tank rear spar. The aft engine fuel crossfeed valve is installed approximately 12 inches to the left of the middle of the body on the rear spar.
S 864-098
(11) Remove electrical power if it is not necessary (AMM 24-22-00/201).
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757 MAINTENANCE MANUAL
FUEL BOOST PUMP - REMOVAL/INSTALLATION
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General
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A. There is a left forward fuel boost pump and a left aft fuel boost pump which move fuel from the left main fuel tank. There is a right forward fuel boost pump and right aft boost pump which move fuel from the right main fuel tank. There is a left fuel override pump and a right fuel override pump which move fuel from the center fuel tank. The left aft fuel boost pump and the right aft fuel boost pump are installed on the inboard rear spar, forward of each main landing gear door. The left forward fuel boost pump and right forward fuel boost pump are installed on the front spar, inboard of each dry bay and aft of the forward slat No. 5. The left fuel override pump and the right fuel override pump are installed on the rear spar of the center fuel tank.
B. Each fuel boost pump assembly or fuel override pump assembly contains four parts: the motor impeller, the housing, the discharge check valve and the removal check valve.
C. It is necessary to defuel the center fuel tank to remove the housing, the discharge check valve and the removal check valve. It is not necessary to defuel the center fuel tank to remove the motor impeller.
D. This procedure contains six tasks. The six tasks are:
(1)
Remove the fuel boost pump or fuel override pump
(2)
Install the fuel boost pump or fuel override pump
(3) 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：757 AMM 飞机维护手册 燃油 CHAPTER 28 - FUEL 3(39)
