12 DO THE ENGINE ACCEL/DECEL
CHECK (AMM 71-00-00/501,
TEST 8).
IS THE TEST IN THE LIMITS?
YES
NO
13 DO THE THRUST CONTROL LOOP
TENSION CHECK (AMM 76-11-00/
501).
IS THE TENSION CORRECT?
YES
YES NO NO
23 WITHIN 5 MINUTES OF ENGINESHUTDOWN, DO THE PLA GAIN CHECK (AMM 73-21-00/511).
YES IS THE VOLTAGE CORRECT? YES
54 DO THE TROUBLESHOOTING FOR N1 RPM OUT OF LIMITS DURING MEC PART POWER TRIM TEST (AMM 71-00-42/101, FIG. 118).
14 NO FAULT FOUND. RETURN THE AIRPLANE TO SERVICE.
Throttle Stagger or N1 is Not at Target at Climb or Cruise
Figure 117B (Sheet 4)
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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.
3.
IF THE AIRPLANE WITH ENGINE INTERMIX, THE STAGGER LIMITS IN NOTES "1." AND "2." ARE INCREASED BY ONE-HALF KNOB.
IF UNSATISFACTORY ENGINE IS NOT KNOWN, IT IS RECOMMENDED THAT YOU DO TROUBLESHOOTING ON THE TWO ENGINES.
THROTTLE STAGGER MAY OCCUR IN ONLY ONE OR IN ALL PHASES OF THE FLIGHT OPERATIONS -- TAKE-OFF, CLIMB OR CRUISE, APPROACH. THERE ARE THREE TROUBLESHOOTING TREES FOR THREE MAIN FLIGHT PHASES. TO REDUCE DIAGNOSTIC TIME, THE TROUBLESHOOTER SHOULD ONLY IMPLEMENT THE APPLICABLE TROUBLESHOOTING TREE. NOTE THAT IF THE THROTTLE STAGGER OCCURS IN ALL PHASES OF FLIGHT, THERE MAY BE MORE THAN ONE PROBLEM; THEREFORE, MOST OR ALL CHECK STEPS/TEST SHOULD BE PERFORMED.
Throttle Stagger or N1 is Not at Target in Approach
Figure 117C (Sheet 1)
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THROTTLE STAGGER OR N1 IS NOT AT TARGET IN APPROACH
SEE SHEET 3 (BLOCK 7)
Throttle Stagger or N1 is Not at Target in Approach
Figure 117C (Sheet 2)
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FROM SHEET 2 (BLOCK 6)
51 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 in Approach
Figure 117C (Sheet 3)
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