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 71-00-42
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 ú  C01  Page 145
 ú  Jul 12/01 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H03380
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
THROTTLE STAGGER OR N1 IS NOT AT TARGET AT CLIMB OR CRUISE

NO
NO
1 LOOK AT THE ENGINE INLET
21 IF FOD IS FOUND, DO THE
AND EXHAUST AREAS FOR OBVIOUS BIRDSTRIKE/FOD TROUBLESHOOTING
SIGNS OF DAMAGE. (AMM 71-00-47/101).

DID YOU FIND FOREIGN IS THE FOD IN LIMITS? OBJECT DAMAGE (FOD) OR METAL
YES
PARTICLES? IS THE ENGINE FOD FREE?

YES NO

2 MAKE SURE THE ENGINE TYPE/

43 MAKE SURE THE PIN THRUST RATINGS ARE CORRECT. SELECTION OF A/T AND FMC AGREE
DO THIS PROCEDURE: A/T WITH THE CURRENT ENGINE(S) AND
BITE - ENGINES/RATINGS THRUST RATING (PER WDM OR
(AMM 22-04-10/101, FIG. 117). SB).
ARE THE TESTS IN THE
LIMITS?

YESNO3 LOOK AT THE T12 SENSOR IN

THE ENGINE INLET FOR DAMAGE/
DEFECTS (AMM 73-21-05/601).
 DID YOU CORRECT THE DEFECTS?

YES YES
4 DO THE PS12 TUBE/MANIFOLD

CHECK (AMM 71-00-59/101,
FIG. 106).
 DID YOU FIND LEAKS OR DAMAGE?

NO NO

5 DISCONNECT PLUG D3010 FROM

46 REPLACE THE P5-68 PMC
THE PMC AT J4 (WDM 73-24-11).PANEL (AMM 73-21-12/401).

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
SEE SHEET 3 (BLOCK 6)
Throttle Stagger or N1 is Not at Target at Climb or Cruise
Figure 117B (Sheet 2)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 71-00-42
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 ú  C01  Page 146
 ú  Jul 12/01 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H03382
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 2 (BLOCK 5)

YES
NO
6 DO THE PMC PLA GAIN CHECK
(AMM 73-21-00/501).

IS THE VOLTAGE CORRECT?
YES NO
7 DO THE PMC AND RELATED COMPONENTS TEST
(AMM 73-21-00/501) (TEST N1
SPEED SENSOR, N2 ALTERNATOR,
T12, MEC'S RVDT).
ARE THE COMPONENTS
SERVICEABLE?

YES NO8 EXAMINE THE THRUST LEVER
TO CONTROL BOX ADJUSTMENT FOR
THE TWO ENGINES (AMM 76-11-00/
501).
IS THE THRUST LEVER
TRAVEL/ALIGNMENT OK?

YES NO9 DO THE T2/CIT SENSOR
TEST 11 (AMM 71-00-00/501).
ARE THE SENSORS
SERVICEABLE?

YES NO10 DO THE PART POWER TRIM

CHECK (AMM 71-00-00/501,
TEST 6) TO CHECK THE %N2 AND
%N1 RPM.
 IS %N2 RPM (PMC OFF) CORRECT?

YES
SEE SHEET 4 (BLOCK 11)

22 ADJUST THE PMC PLA GAIN.
IF NOT ADJUSTABLE, REPLACE THE PMC.
 ADJUSTABLE AFTER PMC REPLACEMENT?
NO

YES

48 REPLACE THE PMC (AMM 73-21-04/401) OR SELECT THE DEFECTED COMPONENT TO REPLACE PER AMM 73-21-00, FIG. 505.

SMALL VOLTAGE ERRORS DO NOT CAUSE MUCH THROTTLE STAGGER. 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.
49 ADJUST THE THRUST CONTROL FUEL PUSH-PULL CABLE (AMM 76-11-00/501).

50 REPLACE THE T2 SENSOR (AMM 73-21-09/401) OR REPLACE THE CIT SENSOR (AMM 73-21-02/ 401).
Throttle Stagger or N1 is Not at Target at Climb or Cruise
Figure 117B (Sheet 3)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 71-00-42
 ALL  ú
 ú  C01  Page 147
 ú  Jul 12/01 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H03387
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