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NOTE:AN INCORRECT START PROCEDURE (START LEVER MOVEMENT BEFORE 20% N2) OR NOT SUFFICIENT STARTER AIR PRESSURE CAN CAUSE A HOT START/ IMPENDING HOT START. IF THE HOT START/ IMPENDING HOT START WAS DUE TO A KNOWN CAUSE, TROUBLESHOOTING IS NOT NECESSARY, BUT THE EGT TIME AND TEMPERATURE MUST BE PLOTTED AND THE NECESSARY ENGINE INSPECTIONS PERFORMED. REFER TO "ENGINE OPERATIONS ABOVE LIMITS AND HIGH ENGINE STRESS INSPECTION" FOR "HOT START OF AN ENGINE" (AMM 72-00-00/601).

 

50 ADJUST THE VSV ACTUACTORS (AMM 75-31-00/501). THEN ADJUST THE VSV FEEDBACK CABLE (AMM 75-31-02/501).

Hot/Impending Hot Start with Indications of Surge (Stall) During Start
Figure 109 (Sheet 1)

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 ú  C01  Page 123
 ú  Jul 15/98 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 1 (BLOCK 8)

NO
YES9
EXAMINE THE CBP VENTURI ON THE BLEED BIAS SENSOR (AMM 75-33-01/601) FOR BLOCK-AGE.
 IS BLOCKAGE FOUND?

NO
NO

11 DO THE VSV FEEDBACK CABLE
STATIC RIGGING CHECK
(AMM 75-31-02/501).

IS THE RIG CHECK CORRECT?
YES
NO

YES
NO
15 DO THE EGT INDICATING SYSTEM ACCURACY TEST AND EGT THERMOCOUPLE HARNESS ELEC-TRICAL CHECK (AMM 77-21-00/ 501).
IS THE EGT INDICATING SYS-TEM OPERATION CORRECT?
YES NO
17 DO THE BLEED AIR CONTROL

SYSTEM OPERATIONAL TEST
(AMM 36-11-05/501).
IS THE SYSTEM OPERATION CORRECT?

YES
YES
19 USE THE BORESCOPE AND
EXAMINE THE BOOSTER, HPC 3RD-,
5TH-, AND 9TH-STAGE BLADES,
HPT BLADES, AND LPT 1ST-STAGE
BLADES (AMM 72-00-00/601).
IS DAMAGE MORE THAN THE LIMITS FOUND?

NO
YES
21 EXAMINE THE FUEL FILTER (AMM 73-11-02/601) FOR METALLIC
MATERIAL.
IS UNUSUAL AMOUNT OF METALLIC MATERIAL FOUND?
NO

 

55 CLEAN THE VENTURI.
61 ADJUST THE VSV STAGES (AMM 75-31-00/501), THEN ADJUST THE VSV FEEDBACK CABLE (AMM 75-31-02/501).

69 REPLACE THE MEC (AMM 73-21-01/401).

Hot/Impending Hot Start with Indications of Surge (Stall) During Start Figure 109 (Sheet 2)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES NONE
NO N2 INDICATION OR IRREGULAR N2 INDICATION DURING START

No N2 Indication or Irregular N2 Indication During Start
Figure 109A

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A09938
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
"ENGINE START" PREREQUISITES SWITCH FAILS TO MAKE SURE THE AIRPLANE IS IN THIS CONFIGURATION: ELECTRICAL POWER IS ON (AMM 24-22-00/201)
HOLD IN "GRD" POSITION

NO

1 AT RIGHT CIRCUIT BREAKER
PANEL P6, REMOVE APPROPRIATE
N2 TACHOMETER RELAY, R357 OR
R358 (WDM 80-11-11). EXAMINE
CONTINUITY FROM CONNECTOR
SOCKET 12 TO AIRPLANE GROUND.

IS CONTINUITY PRESENT?

YES NO
3 ON CIRCUIT BREAKER PANEL,
23 REPLACE APPROPRIATE START/
P6, OPEN APPLICABLE ENG LEFTIGNITION SWITCH, S266 OR S267
AND RIGHT IGNITION, AND ENG (WDM 80-11-11).
START VALVE CIRCUIT BREAKERS. RESTORE AIRPLANE TO

OPEN LEFT FAN COWL PANEL ORIGINAL CONFIGURATION.
AND DISCONNECT CONNECTOR D424
FROM START VALVE. CLOSE
START VALVE CIRCUIT BREAKER.

 POSITION APPROPRIATE
ENGINE START SWITCH TO GRD
　
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