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B. Test
(1) Start the engines (Ref. AMM TASK 71-00-00-710-043).
(2) Check that the idle speed is correct.
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TASK 71-00-00-810-807
The Engine is Slow to Accelerate
1. Possible Causes
_______________
- PS3 Sense Line
- HP Bleed Valve
- Pressure Regulating Valve
- Wing anti-ice valve
- Nacelle anti-ice
- Air conditionning system
- IP check valve
- HMU
- ECU (4000KS)
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 36-11-00-710-001 Operational Test to read the CURRENT STATUS of the
Engine Bleed Air System AMM 36-11-41-200-001 Inspection/Check of the IP Bleed Check Valve AMM 71-00-00-710-010 Accel Check AMM 72-00-00-200-029 Inspection/Check of the PS3 Line AMM 72-31-00-290-001 Inspection of the High Pressure Compressor Rotor
Assembly AMM 73-21-10-000-001 Removal of the Hydromechanical Unit (HMU) AMM 73-21-10-400-001 Installation of the Hydromechanical Unit (HMU) AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU)(4000KS) AMM 73-21-60-400-001 Installation of the Electronic Control Unit
(ECU)(4000KS) R AMM 73-21-60-740-007 Correct Time Limited Faults (Non Asterisked) of the R Engine Scheduled Maintenance Report
AMM 73-29-00-710-040 Operational Test of the FADEC on the ground (with Engine Motoring)
3. Fault Confirmation
__________________
A. test
(1) Do the "ACCEL CHECK" (Ref. AMM TASK 71-00-00-710-010)
NOTE : Slow acceleration is most likely to occur during power up for
____ take off between min idle and N1=50 percent.
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ER (2) If the Accel Chek is within the limits and the fault is still R reported during subsequent flights, following trouble shooting is to R be done at first opportunity without interfering with Revenue Service R Operation.
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R (3) If the Accel Chek is not within the limits, following trouble R shooting is to be done prior to next flight.
R 4. Fault Isolation
_______________
R A. Do this procedure.
R (1) Do a check of the Post Flight Report (PFR), the FADEC Last Leg Report
R and of the Schedule Maintenance Report (SRM) or Class 3 Report (Ref.
R AMM TASK 73-21-60-740-007) for PS3, ECU, HMU, FMV, VSV failure
R messages. Do the trouble shooting related to the failure message(s)
R if present.
R (2) If no failure message is found, do the following trouble shooting:
R - Do a check of the PS3 Sense Line for blockage or leakage (Ref. AMM
R TASK 72-00-00-200-029)
R - If nothing is found:
R - If available, do a check of the DMU take-off report of the last leg
R to determine the level of bleed output taken on each engine. Check
R line C1 of the DMU report ACCS SD/313600 (STANDARD HEADERS FOR
R PRINT REPORTS for details)
R - If no DMU report is available do a test to read the current engine
R status of the bleed air system (Ref. AMM TASK 36-11-00-710-001).
R - If the bleed output recorded either on the DMU report or in the
R bleed air system is not the same for each engine:
R - check that there are no fault affectting the engine HP Bleed Valve
R or Pressure Regulating Valve. Correct as necessary per applicable
R TSM.
R - check that there are no fault affectting the Wing anti-ice valve or
R Nacelle anti-ice. Correct as necessary per applicable TSM.
R - check that there are no fault affectting the Air conditionning
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