71-00-41
ALL ú
ú C02 Page 101
ú Nov 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
Trouble Symptom Listing - Continued
___________________________________
Trouble Symptom_______________ Begin Trouble Shooting
No N2 Indication or Irregular
N2 Indication During Start Fig. 109A Block 1
ENGINE START Switch Fails To Hold
In GRD Position Fig. 110 Block 1
ENGINE START Switch Prematurely
Releases To OFF (At Less Than 46%
N2 RPM) Fig. 111 Block 1
ENGINE START Switch Remains In GRD
Position Above Cutout Speed
(47% N2 RPM) Fig. 112 Block 1
START VALVE OPEN Light Remains
Illuminated After ENGINE START
Switch Returns To OFF Fig. 113 Block 1
Low N2 RPM At Low Idle Fig. 114 Block 1
High N2 RPM At Low Idle Fig. 115 Block 1
Fuel Flow and EGT High At
Usual Idle N2 Fig. 116 Block 1
Low N1 Idle Light On Fig. 117 Block 1
Engine in High Idle On the Ground
When Set For Low Idle Fig. 118 Block 1
Engine in Low Idle On the Ground
When Set For High Idle Fig. 119 Block 1
No N2 Indication or Irregular
N2 Indication At Or Above Idle Fig. 120 Block 1
3. Trouble Shooting Tips
_____________________
A. If an undefined fault is reported during the start cycle, the sequence on the following page may be used in conjunction with an attempted start (AMM 71-00-00/201) to isolate a fault area and allow trouble shooting to begin as listed.
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71-00-41
ALL ú ú C01 Page 102 ú Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
START SEQUENCE STEP BEGIN TROUBLE
(AMM 71-00-00/201)___________________ SHOOTING________
PROVIDE PNEUMATIC POWER
Duct Pressure Low (Below 30 psi) AMM 71-00-59/101
Fig. 101
POSITION "FUEL PUMPS" SWITCHES TO "ON"
LOW PRESSURE lights did not extinguish AMM 28-42-00/101
PLACE APPLICABLE "ENGINE START SWITCH" TO "GRD"
START VALVE OPEN light did not illuminate Fig. 101 Block 11
No N2 indication or irregular N2 indication
OIL PRESS and HYD SYS PRESS increase AMM 71-00-54/101
No evidence of N2 rotation Fig. 101 Block 24
No oil pressure indication AMM 71-00-44/101
Maximum motoring N2 rpm attainable is less than 20% Fig. 101A Block 4
No positive N1 rotation observed Fig. 102 Block 1
ADVANCE START LEVER TO IDLE
Instantaneous lightup (torching) occurs Fig. 107 Block 1
FUEL VALVE CLOSED light does not cycle
DIM-BRIGHT-EXTINGUISH AMM 28-22-00/101
No FF indication Fig. 103 Block 1
No increase in EGT within 10 seconds
One ignition system only Fig. 106 Block 1
Both ignition systems Fig. 103 Block 1
FF high Fig. 104 Block 1
FF fluctuates Fig. 105 Block 1
EGT climbing rapidly (Hot start)
Did not exceed 725°C Fig. 109 Block 5
Exceeded 725°C Fig. 109 Block 1
Slow/No increase in N2 RPM (Hung start)
Before Starter Cutout Fig. 108 Block 1
At or after Starter Cutout Fig. 108A Block 1
ENGINE START switch fails to hold in GRD position Fig. 110 Block 1
ENGINE START switch prematurely releases to OFF
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