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 ALL  ú ú C01 Page 159 ú Mar 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A11362
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES 
ENGINE OPERATION 
ENGINE SPEEDS HIGH DURING HIGH ALTITUDE DESCENT  ____NOTE:  EXCEEDS 50% N1, IT IS NECESSARY TO DO THIS IF ENGINE SPEED DURING IDLE DESCENT FROM CRUISE PROCEDURE. 

GRAVITY CHECK (AMM 71-00-58/ GRAVITY SETTING (AMM 71-00-58/ 101, FIG. 103).101, FIG. 103). IS THE SETTING CORRECT?

YES YES

5 EXAMINE THE CBP TUBE FOR
25 CLEAN/REPAIR/REPLACE THE
LEAKS, DAMAGE OR BLOCKAGE CBP TUBE.
(AMM 71-00-59/101, FIG. 105).

DID YOU FIND LEAKS, DAMAGE, OR BLOCKAGE?
NO YES
7 EXAMINE THE CBP VENTURI ON 27 CLEAN THE VENTURI.
THE BLEED BIAS SENSOR
(AMM 75-33-01/601) FOR
BLOCKAGE.

 IS BLOCKAGE FOUND?

NO SEE SHEET 2
(BLOCK 9)

Engine Speeds High During High Altitude Descent
Figure 121 (Sheet 1)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú
 ú  C01  Page 160
 ú  Jul 12/99 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A11378
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 1
(BLOCK 9)
NO

YES
11 VISUALLY EXAMINE THE VSV
ACTUATION SYSTEM (AMM 72-35-00/ 601).
IS THE DAMAGE FOUND MORE THAN THE LIMITS?

NO NO

13 DO THE VSV FEEDBACK CABLE 
33 ADJUST THE VSV FEEDBACK
STATIC RIG CHECK (AMM 75-31-02/ 501)
 IS THE RIG CHECK CORRECT?
YES

NO

YES CABLE (AMM 75-31-02/501).

35 ADJUST THE VSV ACTUATORS (AMM 75-31-00/501), THEN ADJUST THE VSV FEEDBACK CABLE (AMM 75-31-02/501).
NO

17 DO THE VBV FEEDBACK CABLE 
37 ADJUST THE VBV FEEDBACK
STATIC RIG CHECK (AMM 75-32-05/  CABLE (AMM 75-32-05/501).
501)
IS THE RIG CHECK CORRECT?

YES NO

19 DO THE CIT SENSOR TEST  
39 REPLACE THE CIT SENSOR
(AMM 71-00-00/501, TEST 11).  (AMM 73-21-02/401).
IS THE CIT SENSOR SERVICE-ABLE?

MOTOR (AMM 75-32-02/401).
IF THE PROBLEM CONTINUES, REPLACE THE MEC (AMM 73-21-01/ 401).
Engine Speeds High During High Altitude Descent
Figure 121 (Sheet 2)

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 ALL  ú ú C01 Page 161 ú Mar 15/98
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A11392
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
PREREQUISITE ENGINE OPERATION CAN BE NECESSARY
____THE ENGINE SPEED AT THE MAXIMUM REVERSE PLANOTE:
REVERSE % N1 LOWER
STOP ON MEC VARIES WITH TEMPERATURE AND IS NOT OR HIGHER THAN
ADJUSTABLE. LIMITS ON ENGINE SPEED ARE NOT EXPECTED INCLUDED IN ANY MANUAL.

NO
1 DO THE FUEL CONTROL SYSTEM

ADJUSTMENT/TEST (AMM 73-21-00/
501).
DID THE SYSTEM PASS?
YES NO

2 DEPLOY THE THRUST REVERSER

(AMM 78-31-00/201).
MOVE THE REVERSE THRUST
LEVER TO THE MAXIMUM REVERSE
POSITION.
IS THE MAXIMUM REVERSE
STOP ON THE MEC CONTACTED?
YES NO
3 READ THE PMC RVDT VOLTAGE

(AMM 73-21-00/501).
IS THE VOLTAGE LESS THAN
8.13 AND MORE THAN 7.63 VOLTS?

YES

USE THE PROCEDURE IN AMM 73-21-00/501 ONLY TO GET THE INSTRUCTIONS NECESSARY TO READ AND MEASURE THE PMC RVDT VOLTAGE. USE THE REVERSE THRUST LEVER POSITION AND VOLTAGE LIMITS GIVEN IN THIS TROUBLESHOOTING PROCEDURE.
Reverse % N1 Lower or Higher Than Expected
Figure 122

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