737 AMM 飞机维护手册 发动机燃油和控制 ENGINE FUEL AND CONTRO(10)

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NOTE: Engine fuel shutoff valves may be closed manually if desired.
B.  Pull FUEL FLOW circuit breaker on circuit breaker panel P6.
CAUTION:  FUEL FLOW CIRCUIT BREAKER MUST BE OPENED PRIOR TO DISCONNECTING TRANSMITTER CONNECTOR. FAILURE TO DO SO CAN RESULT IN DAMAGE TO INDICATOR RESET MECHANISM. DAMAGE WILL RESULT IF RESET BUTTON IS PUSHED OR BY PICKUP OF STRAY SIGNALS IF INDICATOR IS ENERGIZED AND THE TRANSMITTER IS DISCONNECTED.
C.  Open left side cowl panel on applicable engine.
3.  Remove Fuel Flow Transmitter
A.  Place suitable container under transmitter to catch fuel spillage.
B.  Disconnect electrical connector from transmitter (Fig. 401).
C.  Disconnect bonding jumper from transmitter.
D.  Disconnect fuel line from fuel inlet connection.
E.  Remove four mounting bolts from clamp plate.
F.  Remove three bolts attaching transmitter support bracket to oil cooler.
G.  Slide support bracket free of fuel inlet connection.
H.  Pull transmitter straight aft until clear of fuel outlet adapter.
I.  Pull transmitter straight out from engine until clear of fuel inlet line. Lift transmitter clear of engine.
J.  Fill transmitter with fluid upon removal from engine. Use fluid from new transmitter or, as a substitute, clean fuel.
4.  Prepare to Install Fuel Flow Transmitter
A.  Remove aft adapter and fuel inlet connection from transmitter and save for installation.
5C8
Jun 20/85 73-31-12 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

C34475
Fuel Flow Transmitter Installation  505 
73-31-12Page 402   Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Jun 20/93 

B.  Remove clamp plate and forward adapter from transmitter and save for installation.
C.  Prior to installing forward adapter, check that forward adapter and clamp plate are compatible per Table 1.
TABLE 1
ADAPTER PWA P/N  CLAMP PLATE PWA P/N  TORQUE VALUE POUND-INCHES  PWA SB4936  STATUS 
773086  773085  570 - 630  ACCOMPLISHED  
447884  719851  570 - 630  NOT ACCOMPLISHED 

D.  Using new O-ring lightly lubricated with fuel, install forward adapter, clamp plate and retainer (backup ring) onto outlet end of transmitter.
NOTE:  Arrow scribed on transmitter indicates direction of fuel flow.
(1)  Prior to attaching forward adapter, lubricate male threads with Molykote Type G-N. Attach forward adapter to transmitter and while gripping the transmitter wrenching flats, tighten adapter to torque values in Table 1.
CAUTION:  DO NOT ALLOW TORQUE TO BE TRANSMITTED THROUGH TRANSMITTER BODY WHILE ATTACHING FORWARD ADAPTER
E.  Using new O-ring lightly lubricated with fuel, install aft adapter, retainer (backup ring) and fuel inlet connection onto inlet end of transmitter.
F.  Place new ferrule, packing and retainer on fuel inlet line.
G.  Place new O-ring, lightly lubricated with fuel, into groove of fuel outlet adapter in outlet end of transmitter.
5.  Install Fuel Flow Transmitter
A.  Position transmitter against engine and insert fuel inlet line into fuel inlet connection.
B.  Insert adapter, on outlet end of transmitter, into fuel outlet adapter.
NOTE:  It may be necessary to spring the fuel inlet line slightly, towards the rear of the engine, to perform steps A. and B. If fuel inlet line does not align with adapter, slacken locknut and rotate fuel inlet connection until aligned with fuel inlet line then tighten locknut.
C.  Slide transmitter support bracket into position on fuel inlet connection and install three mounting bolts.
D.  Install clamp plate mounting bolts with cable support bracket on bottom two bolts.
E.  Connect fuel inlet line to fuel inlet connection.
F.  Install bonding jumper to transmitter.
G.  Connect electrical connector to transmitter.
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Jun 20/92  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  73-31-12 Page 403 

6.  Restore Airplane to Normal Configuration
A.  Push in applicable fire switch to open engine fuel shutoff valve.
B.  Push in FUEL FLOW circuit breaker and applicable ENG SHUTOFF VALVE circuit breaker on circuit breaker panel P6-3.
C.  Perform engine leak check run (Ref 71-00 A/T).
NOTE:  When starting engine for engine leak check run after replacing fuel flow transmitter; the fuel flow indicator will not indicate any flow until all air has been purged from transmitter.
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73-31-12 Page 404  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 20/91 
　
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