71-00-40
ALL ú ú C02 Page 101 ú Mar 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
B. Each section contains a listing of trouble symptoms associated with the section. Each listed symptom includes a reference to the trouble shooting chart (figure) and block within the chart to begin trouble shooting for the particular problem.
C. Trouble shooting charts are provided for major symptoms. Each chart is given a figure number. Component location illustrations and schematic diagrams are provided where essential to support trouble shooting.
(1) Prerequisites are provided to assure that the system is in the required mode, including the power required and identification of the circuit breakers which need to be closed ("in"), to perform the procedure. Time consuming operations such as engine operation are noted.
Circuit breaker locations are defined as follows.
EXAMPLE: 6-3-B13
P6-3 Panel, Grid Location B13
D. Visual checks (71-00-58) and Engine checks (71-00-59) sections provide details for checks that appear repeatedly within trouble shooting charts or that have a degree of complexity requiring a detailed procedure or specific illustrations to accomplish. Visual checks are those checks which may be accomplished by visual observation only (opening of fan cowls or fan duct cowl and thrust reverser halves for access may be required). Engine checks are more complex and may require test equipment, engine operation, and/or removal of components to accomplish.
E. Trouble shooting tips may be included in the section introduction to describe typical problems to the mechanic or technician, and to alert of specific pitfalls that may be encountered.
F. Tests are given in section 71-00-00 that may be referred to by the trouble-shooting charts, or as is necessary to follow maintenance activity. Test No. 12 in section 71-00-00 is intended to be used as a diagnostic aid. Test No. 12 includes an engine run data sheet for use to record engine parameters to determine any necessary adjustments or component replacement. The engine data for the Idle Speed, Accleration, Part Power, and MPA tests in Test No. 12 can be collected in one continuous engine run before analysis. Or, the analysis and related corrective actions can be done after each power level check.
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71-00-40
ALL ú ú C02 Page 102 ú Jul 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
POWER PLANT - TROUBLE SHOOTING (STARTING AND IDLE)
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1. General
_______
A. This section provides trouble shooting charts for faults associated with
engine starting and idle operation.
2. Trouble Symptom Listing
_______________________
Trouble Symptom_______________ Begin Trouble Shooting
No N2 Rotor Rotation When Start Initiated Fig. 101 Block 1
-Start Valve Open Light Did Not Come On Fig. 101 Block 11
-No Drop In Duct Pressure Fig. 101 Block 12
-Duct Pressure Normal and Start Valve Open Light Illuminated Fig. 101 Block 2
Slow N2 Rotor Rotation When Start Initiated Fig. 101A Block 1
-Stable Duct Pressure Fig. 101A Block 11
-Duct Pressure Is Not Stable Fig. 101A Block 2
No N1 Rotor Rotation
Visually Observed
During Start Attempt Fig. 102 Block 1
No Starting Fuel Flow; N2 Rotates Fig. 103 Block 1
High Starting Fuel Flow Fig. 104 Block 1
Fuel Flow is Not Stable During Start Fig. 105 Block 1
Engine Will Not Start On
One Ignition System Fig. 106 Block 1
Instantaneous Lightup (Torching)
With Start Lever Movement/Internal
Engine Fire After Shutdown Fig. 107 Block 1
Slow Start/Hung Start Before
Starter Cutout - EGT Usual Fig. 108 Block 1
Slow Start/Hung Start At or After
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