NO 5

EXCHANGE PRIMARY ENGINE DISPLAY UNIT WITH OPERABLE UNIT (31-42-01 R/I). WET MOTOR ENGINE AND OBSERVE INDICATOR (71-00-00 MP).
 IS THERE FUEL FLOW INDICATION?
DISPLAY UNIT (31-42-01 R/I).
13 CHECK AND REPAIR CIRCUIT BETWEEN CIRCUIT BREAKER AND PRIMARY ENGINE DISPLAY UNIT (WM 77-12-11).
15 REPLACE PRIMARY ENGINE DISPLAY UNIT (31-42-01 R/I).

No Fuel Flow Indication
Figure 101 (Sheet 2)

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 71-00-53
 INSTRUMENT SYSTEM (EIS)  ú
 ú  C01  Page 103
 ú  Jul 15/88 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
POWER PLANT - TROUBLE SHOOTING (ENGINE INDICATION)
__________________________________________________
 1.  General
_______
 A.  Engine indicating trouble shooting is provided by trouble trees with corrective actions.
 (1)  Trouble trees for the N1, N2, EGT and AVM indicating systems are included in this section.
 2.  Trouble Shooting Tips
_____________________
 A.  General
 (1)  
Assure that all circuit breakers applicable to system are closed before beginning trouble shooting. If circuit breakers open during trouble shooting, correct overload by replacing faulty components or repairing wiring before continuing.

 (2)  
When trouble shooting indicating systems utilizing lights controlled by master dim and test circuits, test operation of indicating lights before beginning trouble shooting.

 (3)  
Indicators utilizing both numerical counters and scales should be checked during trouble shooting to assure that counter and scale reading agree.

 B.  
Exhaust Gas Temperature (EGT) Indicating System

 (1)  
Chromel and alumel wire can be identified by wire jacket color (white for chromel and green for alumel). Nuts, bolts and other hardware can be identified by checking magnetism (chromel is non magnetic and alumel is magnetic).

___
 C.  Airborne Vibration Monitoring (AVM) System
 (1)  
During engine run or during flight, if AVM system gives consistently higher than normal readings with all other engine indications normal, the possibility of loose or misclamped wiring in strut exists. General inspection of strut area wiring should be made.

 (2)  
Other conditions to check:

 (a)  
Ice in fan inlet cone

 (b)  
Loose pneumatic ducts

 (c)  
Loose cowling

 (d)  
Loose thrust reverser components

 (e)  
Loose engine accessories

 3.  Trouble Symptom Listing
_______________________ Trouble Symptom_______________ Begin Troubleshooting
 A.  N1 Indicating Problem
 (1)  High, low, or above normal fluctuations
 (a)  High 71-00-54 Fig. 101 Blk 1
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 71-00-54
 ALL  ú ú C02 Page 101 ú Mar 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(b)  
Low, fluctuates 71-00-54 Fig. 101 Blk 21 (AIRPLANES WITHOUT EIS) Blk 1 (AIRPLANES WITH EIS)

 (2)  
No indication

 (a)  
Indicator inoperative 71-00-54 Fig. 101 Blk 21 (AIRPLANES WITHOUT EIS) Blk 1 (AIRPLANES WITH EIS)

 (b)  
Blank LED display & pointer 71-00-54 Fig. 101 Blk 1 below zero

 (3)  
Conflicting indications (AIRPLANES WITHOUT EIS)

 (a)  
N1 Pointer & digital 71-00-54 Fig. 101 Blk 21 readout differ

 (b)  
N1 index marker & lower digital 71-00-54 Fig. 101 Blk 21 readout differ

 B.
N2 Indicating Problem

 (1)  
High, low, or above normal 71-00-54 Fig. 102 Blk 1
 fluctuations

 (2)  
　
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