DOC AIRBUS | TSM A320FN1 more than the Limit on Engine 1
1. Possible Causes
· LP compressor
· LP turbine
· FMU ( 4000KC )
· EEC ( 4000KS )
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
75-30-00-810-803-B Failure of the Master LPC Bleed Actuator on Engine 1
Ref. AMM 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External
Power
Ref. AMM 31-60-00-860-002 EIS Stop Procedure
Ref. AMM 71-00-00-860-010 Engine Operation Limits, Guidelines and Special Procedures (Pre SB
79-0070)
Ref. AMM 71-11-11-200-011 Visually Examine the Air Intake Cowl - Allowable Damage Data
Ref. AMM 72-00-00-200-012 Borescope Inspection of the LP Turbine
Ref. AMM 72-00-00-200-017 Inspection of the LP Compressor
Ref. AMM 72-00-00-720-010 Load Check of the LPC Bleed Valve Mechanism
Ref. AMM 72-31-11-200-010 Inspection of the Low Pressure (LP) Compressor Fan Blades
Ref. AMM 72-38-11-200-010 Inspection of the Inlet Cone and the Inlet Cone Fairing
Ref. AMM 73-22-34-000-010 Removal of the Electronic Engine Control (EEC)
Ref. AMM 73-22-34-400-010 Installation of the Electronic Engine Control (EEC)
Ref. AMM 73-22-52-000-010 Removal of the Fuel Metering Unit (FMU)
REFERENCE DESIGNATION
Ref. AMM 73-22-52-400-010 Installation of the Fuel Metering Unit (FMU)
Ref. AMM 77-00-00-710-041 Reset of the N1, N2 and EGT Max Pointers
Ref. AMM 78-10-00-200-012 Visually Examine the Mixed Exhaust System
Ref. AMM 78-11-11-200-010 Visually Examine the Outer Duct Seals of the Common Nozzle Assembly
3. Fault Confirmation
Subtask 77-00-00-710-240-A
A. Test
(1) Get the EIS (DMC1) ENGINE OVER SPD/TEMP menu on the MCDU Ref. AMM 77-00-00-710-041 .
(2) On the EIS (DMC1) ENGINE OVER SPD/TEMP menu, push the line key adjacent to N1 E1 to get the
N1 E1 OVERSPEED menu.
(3) On the N1 E1 OVERSPEED menu, do a check to see if there is or not an overspeed record.
Subtask 77-00-00-710-241-A
B. Check for N1 Rotor Speed Limits
(1) Do the engine operation limits, guidelines and special procedures Ref. AMM 71-00-00-860-010 .
NOTE: You can get the overlimit/time from the exceedance report.
4. Fault Isolation
Subtask 77-00-00-810-178-A
A. If the test shows that N1 is more than the limit and the fault is identified by the ECAM warning ENG 1 N1
OVERLIMIT:
(1) Do a check of the LPC bleed system Ref. AMM 72-00-00-720-010
(a) Examine the actuators and lines for signs of leakage
· repair or replace as necessary.
(b) Examine the mechanical linkage for signs of interference/damage, bearing looseness or too
much binding
· repair or replace as necessary.
(c) Examine the electrical harness and make sure that the plugs are correctly connected
(Ref. TSM 75-30-00-810-803) .
(d) Examine the bleed valve for signs of damage
· repair or replace as necessary.
(2) Visually examine the air intake cowl Ref. AMM 71-11-11-200-011 .
(3) Do the inspection of the inlet cone Ref. AMM 72-38-11-200-010 .
(4) Do the inspection of the LP compressor blades and fillers Ref. AMM 72-31-11-200-010 .
(5) Examine the turbine exhaust case and common nozzle assembly for damage, signs of metal particles
and/or unwanted material Ref. AMM 78-10-00-200-012 Ref. AMM 78-11-11-200-010
· repair/replace as necessary
(6) Do a borescope inspection of the LP compressor Ref. AMM 72-00-00-200-017 and LP turbine
Ref. AMM 72-00-00-200-012
· repair/replace as necessary
(7) If the fault continues:
· replace the FMU ( 4000KC ) Ref. AMM 73-22-52-000-010 and Ref. AMM 73-22-52-400-010
(8) If the fault continues:
· replace the EEC ( 4000KS ) Ref. AMM 73-22-34-000-010 and Ref. AMM 73-22-34-400-010 .
5. Close-up
Subtask 77-00-00-860-093-A
A. Put the aircraft back to its initial configuration.
(1) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
Ref. AMM 31-60-00-860-002 .
(2) De-energize the aircraft electrical circuits
Ref. AMM 24-41-00-862-002 . [Rev.6 from Feb 2017] 2026.04.04 04:37:48 UTC