YES
CHECK FOR 28V DC AT RELAY 25 REPLACE APPROPRIATE N2 CONNECTOR, SOCKET 2 (AIRPLANE TACHOMETER RELAY, R357 OR R358 GROUND).(WDM 80-11-11).
IS 28V DC PRESENT? RESTORE AIRPLANE TO ORIGINAL CONFIGURATION.
ENGINE START Switch Fails to Hold in GRD Position
Figure 110
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES28V DC ELECTRICAL POWER
"ENGINE START" SWITCH PREMATURELY RELEASES TO "OFF" (AT LESS THAN 46% N2 RPM)
NO
1 AT RIGHT CIRCUIT BREAKER
PANEL P6, REMOVE APPROPRIATE
N2 TACHOMETER RELAY R357 OR
R358 (WM 80-11-11). CHECK
CONTINUITY THROUGH RELAY PINS
6 AND 12.
IS CONTINUITY PRESENT?
YES
NO
3 APPLY 28V DC TO RELAY PIN
6 AND GROUND PIN 12 TO ENER-
GIZE RELAY. CHECK CONTINUITY
THROUGH RELAY PINS 1 AND 2.
IS CONTINUITY PRESENT?
YES
NO
5 ON CIRCUIT BREAKER PANEL
P6, OPEN APPLICABLE ENG LEFT
AND RIGHT IGNITION, AND ENG
START VALVE CIRCUIT BREAKERS.
OPEN LEFT FAN COWL PANEL AND DISCONNECT ELECTRICAL CON-NECTOR D424 FROM START VALVE. CLOSE START VALVE CIRCUIT BREAKER.
POSITION APPROPRIATE ENGINE START SWITCH TO GRDYESPOSITION.
CHECK FOR 28V DC AT RELAY CONNECTOR SOCKET 2 (AIRPLANEGROUND).
IS 28V DC PRESENT?
ENGINE START Switch Prematurely Releases to OFF
(At less than 46% N2 RPM)
Figure 111
25 REPLACE APPROPRIATE START/
IGNITION SWITCH S266 OR S267
(WM 80-11-11).
RESTORE AIRPLANE TO ORIG-INAL CONFIGURATION.
27 REPLACE APPROPRIATE N2
TACHOMETER RELAY R357 OR R358
(WM 80-11-11).
RESTORE AIRPLANE TO ORIG-INAL CONFIGURATION.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
"ENGINE START" PREREQUISITES
SWITCH REMAINS IN MAKE SURE THE AIRPLANE IS IN THIS CONFIGURATION:
"GRD" POSITION ELECTRICAL POWER IS ON (AMM 24-22-00/201)
ABOVE CUTOUT SPEED
(47% N2 RPM)
CONTINUITY THROUGH RELAY PINS 1 AND 2 (FOR FROZEN CONTACTS).
IS CONTINUITY PRESENT?
ENGINE START Switch Remains in GRD Position Above Cutout Speed
(47% N2 RPM)
Figure 112
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES NONE
"START VALVE OPEN" LIGHT REMAINS ILLU-MINATED AFTER "ENGINE START" SWITCH RETURNS TO "OFF"
START VALVE OPEN Light Remains Illuminated after ENGINE START Switch Returns to OFF
Figure 113
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES
ENGINE OPERATION
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