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71-00-42
ALL ú
ú C02 Page 135
ú Nov 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 2 (BLOCK 4)
YES
NO
5
DISCONNECT PLUG D3010 FROM
THE PMC AT J4 (WDM 73-24-11).
MAKE SURE THE PMC SWITCH IS AT THE ON POSITION AND DO A CONTINUITY CHECK FROM SOCKET 7 TO SOCKET 8.
IS THERE AN OPENING FROM SOCKET 7 TO SOCKET 8?
YES
YES
6 DO THE PS12 TUBE/MANIFOLD
CHECK (AMM 71-00-59,
FIG. 106).
DID YOU FIND LEAKS OR DAMAGE?
NO
NO
7 LOOK AT THE T12 SENSOR IN THE ENGINE INLET FOR DAMAGE/
DEFECTS (AMM 73-21-05/601).
DID YOU CORRECT THE DEFECTS?
YES
NO
8 LOOK AT THE T2 SENSOR IN THE ENGINE INLET FOR DAMAGE/
DEFECTS (AMM 73-21-05/601).
DID YOU CORRECT THE DEFECTS?
YES
NO
9 DO THE PMC AND RELATED COMPONENTS TESTS
(AMM 73-21-00/501)(TEST N1
SPEED SENSOR, N2 ALTERNATOR,
T12, PS12 MEC'S RVDT, TM).
DID THE COMPONENTS PASS THE TEST?
YES
SEE SHEET 4 (BLOCK 10)
Throttle Stagger or N1 Is Not at Target for Throttle Hold during Take-off
Figure 116 (Sheet 3)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
71-00-42
ALL ú
ú C02 Page 136
ú Mar 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H03182
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
NO
YES
NO
14 DO THE ENGINE ACCEL/DECEL
CHECK (AMM 71-00-00/501,
TEST 8).
IS THE TEST IN THE LIMITS?
YES
SMALL VOLTAGE ERRORS DO NOT CAUSE MUCH THROTTLE STAGGER.
FROM SHEET 3
(BLOCK 9)
YES
NO
NO
10 DO THE PMC PLA GAIN CHECK
22 ADJUST THE PMC PLA GAIN.
(AMM 73-21-00/501). IF NOT ADJUSTABLE, REPLACE
IS THE VOLTAGE CORRECT? THE PMC.
ADJUSTABLE AFTER PMC YES
YES
REPLACEMENT?
NO
11 DO THE T2/CIT SENSOR TEST 11 (AMM 71-00-00/501). ARE THE SENSORS SERVICE-ABLE?
YES
NO
NO
12 DO THE PART POWER TRIM
23 WITHIN 5 MINUTES OF ENGINE
CHECK (AMM 71-00-00/501, SHUTDOWN, DO THE PLA GAIN
TEST 6). CHECK (AMM 73-21-00/501).
IS THE %N1 RPM (PMC ON) IS THE VOLTAGE IN THE CORRECT? LIMITS CORRECT?
YES YES
54 REPLACE THE T2 SENSOR (AMM 73-21-09/401). REPLACE THE CIT SENSOR (AMM 73-21-02/401).
56 DO THE TROUBLESHOOTING FOR N1 RPM OUT OF LIMITS DURING MEC PART POWER TRIM TEST (AMM 71-00-42, FIG. 118).
THE VOLTAGE ERROR WOULD HAVE TO BE ALMOST ONE VOLT TO PRODUCE ONE KNOB OF THROTTLE STAGGER. A SMALL VOLTAGE ERROR IS PROBABLY NOT THE ONLY THING TO CAUSE A LARGE THROTTLE STAGGER. THE TROUBLESHOOTING SHOULD CONTINUE IF A SMALL VOLTAGE ERROR IS FOUND.
Throttle Stagger or N1 Is Not at Target for Throttle Hold during Take-off
Figure 116 (Sheet 4)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
71-00-42
ALL ú
ú C01 Page 137
ú Mar 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H03187
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES
MAKE SURE THE AIRPLANE IS IN THIS CONFIGURATION: ELECTRICAL POWER IS ON (AMM 24-22-00/201)
NOTES ON THROTTLE STAGGER:
1.
THROTTLE STAGGER WITH "PMC ON" SHOULD NOT USUALLY BE MORE THAN ONE KNOB WITH STABILIZED EQUAL %N1.
2.
THROTTLE STAGGER WITH "PMC OFF" OR "INOPERATIVE" CAN BE MORE THAN ONE KNOB AS THE THRUST IS CONTROLLED TO %N2 (NOT %N1). BECAUSE OF ENGINE TO ENGINE SPEED (%N1) - SPEED (%N2) RELATIONSHIPS, DIFFERENT "PLA" SETTINGS CAN OCCUR FOR A GIVEN INDICATED %N1.
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