73-11-00
 ALL  ú ú C01 Page 6 ú Mar 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SERVO FUEL
HEATER
ENGINE

12
REVERSERREVERSER
TRANSFEROIL/FUEL HEAT
GEARBOX
EXCHANGER

PMC PMC
(TGB)
ON ONLOW IDLE INOP
INOP
ACCESSORY
GEARBOX
P5-68 ENGINE MODULE-PILOTS' OVERHEAD PANEL

PMC ONLOW/HIGH IDLEAND INOP
FF/FUX1000
INDICATION
60 60
N2
15 1
5
PULL
PULLTO
TO
SET42 42 SET
3
33
FUEL PUMP PS12
N1 N1
AMM 73-21-04
PUSHKG
FUEL USEDRESET
KGPH
CDP (PS30)PS12
SEEA  T2P2 FUELFAN INLET
FLOW/USEDMASTER
FUEL FILTER CIT (T25)PRESSURE
INDICATORSCAUTION
CBP (9TH-STAGEBLEED
T12 FAN INLET
FWD

POWER
TEMPERATUREFUEL
SIGNAL)
MANAGEMENTTR-RESET CONTROL
N1 SPEED
FUEL VALVEFUEL VALVE
CLOSED

CLOSED
(PMC) TRANSMITTER
MEC
FUEL
-20 +2000
77-12-01
RATE/USED RATE/USED-40 +40
FUEL FILTERA  TEMP
DIFFERENTIALN2 ALTERNATORPRESSURE SPEED SENSOR
THRUST
FILTER VALVE
FILTER
BYPASS

SWITCH
OPEN BYPASS
AND PMC POWER
LEVER INPUT
SOURCE OIL/FUEL HEAT
76-00-00
FEED
CROSS
77-12-02SERVO
MM 73-31-02OILFUEL79-21-00 HEATER P2 FUEL FLOW/USED
AMM 73-21-08
EXCHANGER VARIABLE
INDICATORSTRIM COMMANDPOWER LEVER
STATOR
FUEL FLOWTO TORQUEANGLE
VANE CONTROLOIL
RESET
(VSV)HEATED FUEL
MOTOR TRANSDUCER VARIABLE RATE FUEL USED
TO MEC SERVO 2
BLEED RESET SWITCH
CONTROLS
USED
VALVE CONTROLVALVE
RELIEF(VBV)
TURBINECLEARANCEHIGH PRESSURECONTROLPUMP
ENGINE AIRSHUTOFFSYSTEM
FUEL
HPTCC
VALVE  1 75-00-00 NOZZLE
TIMER
(20) FUEL
WASH
PRESSURIZING FUEL FLOWMETER
FUELFILTER
VALVE  TRANSMITTERVALVE
FILTER
MEC DISCHARGE PORT
MECHANICAL
INPUT

N2 1 ENGINES WITH HPTCC TIMER
BYPASS
2AIRPLANES WITHOUT ENGINE28-00-00 INSTRUMENT SYSTEM (EIS)FUEL SYSTEM
VALVE
LOW PRESSURE PUMP 3 AIRPLANES WITH ENGINE
INSTRUMENT SYSTEM (EIS)FUEL PUMP MAIN ENGINE CONTROL
AMM 73-11-01  AMM 73-21-01
Fuel System Diagram
Figure 5

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 73-11-00
 ALL  ú ú C03 Page 7 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FUEL DISTRIBUTION SYSTEM - INSPECTION/CHECK
___________________________________________
 TASK 73-11-00-206-001-C00
 1.  Fuel Distribution System Inspection
___________________________________
 A.  References
 (1)  
AMM 71-11-02/201, Fan Cowl Panels

 (2)  
AMM 73-11-03/401, Servo Fuel Heater

 B.  Access
 (1)  
Location Zones
 506 Engine No. 1
 606 Engine No. 2

 (2)  
Access Panels
 5746L Engine No. 1 - Left Fan Cowl Panel
 5846R Engine No. 2 - Left Fan Cowl Panel

 C.  Examine the Servo Fuel Heater (Fig. 601)
 S 016-005-C00
 (1)  
Open the left fan cowl panel (AMM 71-11-02/201).

 S 216-002-C00

 (2)  
Examine the housing for evidence of fuel leakage.

 (a)  
No leakage is permitted.

 1)  Replace the servo fuel heater or the servo fuel heater cover and seal, as applicable (AMM 73-11-03/401).

 (b)  
ENGINES PRE-CFMI-SB 73-018; If you find leakage between the housing and the cover, do a check to make sure the center bolt is P/N AS24634.

 S 216-003-C00
 (3)  Examine all areas for this condition:
 (a)  Cracks.
 1)  Cracks are not serviceable. Replace the servo fuel heater (AMM 73-11-03/401).
 S 216-004-C00
 (4)  Examine the sealing faces for:
 (a)  Dents, gouges, scratches.
　
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