A
757
MAINTENANCE MANUAL
SEE A
TANK END RIB (REF)
BYPASS VALVE
SUCTION FEED LINE
FWD OUTBD
FILTER SCREEN
MAIN TANK FUEL BOOST PUMP BYPASS VALVE (LEFT SIDE SHOWN, RIGHT SIDE OPPOSITE)
A
Main Tank Fuel Boost Pump Bypass Valve Figure 6
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
28-22-00
ALL ú ú 11 Page 12 ú Mar 20/93
A
757
MAINTENANCE MANUAL
(3) The float operated shutoff valve consists of a housing with an inlet port, discharge port, and a float. When the tank is more than half full, the float is raised to a position that closes the valve and prevents the scavenge system from operating. When the tank drops below half full, the float drops and lets the valve swing open allowing the scavenge system to discharge fuel into the left main tank.
3. Operation (Fig. 8 - Fig. 10)
_________
A. Functional Description
(1) The engine fuel feed system supplies fuel to each engine from the left or right fuel tanks. Normally the center wing fuel tank empties prior to the main fuel tanks. The right fuel override pump will supply fuel if both AC buses fail and the hydraulic motor generator comes on (airplanes with 8 KVA generator only). The engine fuel shutoff valves control fuel flow to each engine. The engine fuel crossfeed valve(s) allows any fuel tank to supply fuel to either engine.
Automatic Sumping Jet Pump
Figure 7
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
28-22-00
ALL ú ú 19 Page 13 ú May 20/98
A
757
MAINTENANCE MANUAL
FWD
LEFT FORWARD
FUEL BOOST OUTBDPUMP
FUEL SCAVENGE JET PUMP
SEE B
TANK END
FLOAT OPERATED
SHUTOFF VALVE
SEE A
FLOAT OPERATED
SHUTOFF VALVE
FWD
INBD
FLOAT OPERATED SHUTOFF VALVE INSTALLATION
A MOUNTING
FUEL SCAVENGE TUBINGBRACKETJET PUMP
TUBING
BONDING CABLE (EXAMPLE)
TUBING
FUEL SCAVENGE JET PUMP INSTALLATION
B
Fuel Scavenge System Figure 7A
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
28-22-00
ALL ú ú 16 Page 14 ú Sep 20/93
中國(guó)航空網(wǎng) m.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：757 AMM 飛機(jī)維護(hù)手冊(cè) 燃油 CHAPTER 28 - FUEL 2(101)
