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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)
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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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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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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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