3.
IF THE AIRPLANE WITH ENGINE INTERMIX, THE STAGGER LIMITS IN NOTES "1." AND "2." ARE INCREASED BY ONE-HALF KNOB.
4.
THROTTLE STAGGER WILL OCCUR IF THE MAIN ENGINE CONTROL OR POWER MANAGEMENT CONTROL IS NOT THE CORRECT CONFIGURATION FOR THE ENGINE.
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 DONE.
Throttle Stagger or N1 is Not at Target in All Phases of Flight Not Known
Figure 117A (Sheet 1)
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THROTTLE STAGGER OR N1 IS NOT AT TARGET IN ALL PHASES OF FLIGHT NOT KNOWN
SEE SHEET 3 (BLOCK 6)
Throttle Stagger or N1 is Not at Target in All Phases of Flight Not Known
Figure 117A (Sheet 2)
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FROM SHEET 2 (BLOCK 5)
YES
NO
6
DO THE THRUST CONTROL
TENSION CHECK LOOP
(AMM 76-11-00/501).
IS THE TENSION CORRECT?
YES
NO
7 DO THE FORWARD THRUST
CONTROL SYSTEM FRICTION CHECK
(AMM 76-11-00/501).
IS THE CHECK CORRECT?
YES
NO
8 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
NO
9 LOOK AT THE T12 SENSOR IN THE ENGINE INLET FOR DAMAGE/
DEFECTS (AMM 73-21-05/601).
DID YOU CORRECT THE DEFECTS?
YES
NO
10 LOOK AT THE T2 SENSOR IN THE ENGINE INLET FOR DAMAGE/
DEFECTS (AMM 73-21-05/601).
DID YOU CORRECT THE
DEFECTS?
YES
NO
11 DO THE PMC AND RELATED COMPONENTS TESTS
(AMM 73-21-00/501)(TEST N1
SPEED SENSOR, N2 ALTERNATOR,
T12, PS12 MEC'S RVDT, TM).
ARE THE COMPONENTS SERVICEABLE?
YES
SEE SHEET 4 (BLOCK 12)
Throttle Stagger or N1 is Not at Target in All Phases of Flight Not Known
Figure 117A (Sheet 3)
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FROM SHEET 3 (BLOCK 11) YES
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 in All Phases of Flight Not Known
Figure 117A (Sheet 4)
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