YES
NO
19 FOR THE TWO ENGINES, DO A
VBV FEEDBACK CABLE STATIC RIG
CHECK (AMM 75-32-05/501).
IS THE RIG CHECK CORRECT?
YES
NO
21 FOR THE TWO ENGINES, DO
VBV FEEDBACK CABLE TRAVEL AND
RESISTANCE CHECKS
(AMM 75-32-05/501).
VISUALLY EXAMINE ALL DOORS FULL OPEN AND CLOSED(AMM 75-32-00/201).
ARE THE CHECKS CORRECT?
YES NO
22 FOR THE TWO ENGINES, DO
THE CIT SENSOR TEST
(AMM 71-00-00/501,
TEST NO. 11.
ARE THE SENSORS SERVICE-ABLE?
YES
NO
27 DO THE VSV DYNAMIC RIG
(AMM 75-31-00/501) FOR THE
SLOWER ENGINE. ADJUST VSVs TO
THE OPEN SIDE OF THE TOLER-ANCES.
DOES THE PROBLEM CONTINUE?
YES
SEE SHEET 4 (BLOCK 28)
Differential Engine Acceleration from Low Idle
Figure 119 (Sheet 3)
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FROM SHEET 3 (BLOCK 22)
YES
NO
28 DO THE VSV DYNAMIC RIG (AMM 75-31-00/501) FOR THE
FASTER ENGINE. ADJUST VSVs TO
THE CLOSED SIDE OF THE
TOLERANCES.
DOES THE PROBLEM CONTINUE?
YES
NO
29 FOR THE SLOWER ENGINE,
ADJUST LOW IDLE TO THE HIGH
SIDE OF THE TOLERANCES
(AMM 71-00-00/501, TEST NO. 4)
TO REDUCE ACCEL VARIATION.
FOR THE FASTER ENGINE, ADJUST LOW IDLE TO THE LOW SIDE OF THE TOLERANCES.
DOES THE DIFFERENTIAL ACCELERATION CONTINUE?
FASTER ENGINE (AMM 73-21-01/ 401).
A HIGH CYCLE MEC MAY CAUSE FUEL ENRICHMENT, MAKE ENGINE ACCELERATION FASTER AND HIGHER EGT DURING STARTING.
Differential Engine Acceleration From Low Idle Figure 119 (Sheet 4)
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CFM56 ENGINES
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PREREQUISITES
SLOW/HUNG DECELERA- ENGINE OPERATION CAN BE NECESSARY
TION
NO
1
DO THE MEC SPECIFIC21 ADJUST THE MEC SPECIFIC GRAVITY CHECK (AMM 71-00-58/ GRAVITY SETTING (AMM 71-00-58/ 101, FIG. 103). 101, FIG. 103). IS THE SETTING CORRECT?
YES YES
3 EXAMINE THE CBP TUBE FOR
LEAKS, DAMAGE OR BLOCKAGE
(AMM 71-00-59/101, FIG. 105).
DID YOU FIND LEAKS, DAM-AGE, OR BLOCKAGE?
NO YES
5 EXAMINE THE CBP VENTURI ON
THE BLEED BIAS SENSOR
(AMM 75-33-01/601) FOR BLOCK-
AGE.
DID YOU FIND BLOCKAGE?
NO YES
7 VISUALLY EXAMINE THE VSV
ACTUATION SYSTEM (AMM 72-35-00/
601).
IS THE DAMAGE FOUND MORE THAN THE LIMITS?
NO NO
9 DO THE VSV FEEDBACK CABLE
STATIC RIG CHECK (AMM 75-31-02/
501).
IS THE RIG CHECK CORRECT?
YES SEE SHEET 2
(BLOCK 11)
Slow/Hung Deceleration
Figure 120 (Sheet 1)
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A11361
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CFM56 ENGINES
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FROM SHEET 1 (BLOCK 9)
STATIC RIG CHECK (AMM 75-32-05/ CABLE (AMM 75-32-05/501). 501)
IS THE RIG CHECK CORRECT?
REPLACE THE MEC (AMM 73-21-01/ 401).
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