(1) Repeat the fault isolation procedure if the fault continues.
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1. Possible Causes
Slow Acceleration to Idle on Engine 1 or 2 _______________
- Hydromechanical Unit (HMU)
2. Job Set-up Information______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 28-24-00-710-002
AMM 28-24-00-720-001 AMM 71-00-00-710-006 AMM 71-00-00-710-025 R AMM 72-21-00-210-006 AMM 72-21-00-290-003
AMM 72-31-00-290-002
AMM 72-41-00-290-001
R AMM 72-51-00-290-004
AMM 72-54-00-210-005 AMM 72-54-00-290-005 AMM 72-54-00-290-006 AMM 72-54-00-290-007 AMM 72-54-00-290-008 AMM 73-11-10-210-002 AMM 73-11-10-280-002 AMM 73-21-10-000-002 AMM 73-21-10-400-002 AMM 73-29-00-710-040
AMM 75-31-00-210-002
3. Fault Confirmation
__________________Operational Test of the ENG 1(2) LP Fuel Valve 12QM (13QM)Functional Test of the LP Fuel Shut Off ValvesMinimum Idle CheckAccel Check Inspect Fan Rotor Blades Removed from the Fan Disk.Borescope Inspection of the Booster Rotor Blades, Stages 2,3,4 and 5 through the Booster Inlet and Borescope Ports SO3 and SO5Inspection of the High Pressure Compressor Rotor AssemblyBorescope Inspection of the Combustion Chamber Liners, Dome Areas,HPT Nozzle Vanes and ShroudsBorescope Inspection of High-Pressure Turbine Nozzle AssemblyInspection of the Turbine CaseInspection of the Stage 1-3 BladesInspection of the Stage 4 BladesInspection of the Stage 2-4 Nozzle SegmentsInspection of the Stage 1-4 Stationary Air SealsVisual Inspection of the Impeller RotationCheck of the Engine Fuel Pump Discharge PressureRemoval of the Hydromechanical Unit (HMU)Installation of the Hydromechanical Unit (HMU)Operational Test of the FADEC on the ground (with Engine Motoring)Visual Inspection of the Variable Bleed Valve System
A. Not applicable, the fault is evident.
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4. Fault Isolation
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A. If the fault symptom is identified by the crew observation: slow acceleration to idle after light off:
(1) Do a check of the engine inlet and exhaust areas for damage.
(2) In case of acceleration problem from idle, do an acceleration check to confirm the fault (Ref. AMM TASK 71-00-00-710-025).
(3) Do a check for aircraft bleed system malfunction (pack valve/engine air intake anti ice/wing anti ice/bleed leakage).
(4) Do a check of the PS3 line to make sure that there is no blockage or leakage.
(5) Do an operational test of the FADEC on the ground (with engine motoring) to do a check of the VSV/VBV position (Ref. AMM TASK 73-29-00-710-040).
(6) Do a visual inspection of the VBV system (Ref. AMM TASK 75-31-00-210-002).
(7) Do a check of the fuel pump impeller rotation and discharge pressure (Ref. AMM TASK 73-11-10-210-002) and (Ref. AMM TASK 73-11-10-280-002).
(8) Do a check of the LP fuel valve for malfunction (Ref. AMM TASK 28-24-00-710-002) and (Ref. AMM TASK 28-24-00-720-001).
(9) Replace the Hydromechanical Unit (HMU) (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
(10) Do a borescope inspection of the fan and booster assembly (Ref. AMM TASK 72-21-00-210-006) and (Ref. AMM TASK 72-21-00-290-003).
(11) Do a borescope inspection of the high pressure compressor rotor assembly (Ref. AMM TASK 72-31-00-290-002).
(12) Do a borescope inspection of the combustion chambers (Ref. AMM TASK 72-41-00-290-001).
(13) Do a borescope inspection of the high-pressure turbine-nozzle assembly (Ref. AMM TASK 72-51-00-290-004).
(14) Do a borescope inspection of the low pressure turbine (Ref. AMM TASK 72-54-00-290-005) and (Ref. AMM TASK 72-54-00-290-006) and (Ref. AMM TASK 72-54-00-290-007) and (Ref. AMM TASK 72-54-00-290-008) and (Ref. AMM TASK 72-54-00-210-005). 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320 Trouble Shooting Manual 排故手册 发动机燃油和控制 1(30)
