(1) If the N1 overlimit is confirmed through the data contained in the Specific Data Report(s) (Ref. AMM TASK 73-21-60-740-027) or AIDS data, or DFDR data and if the Crew reported the N1 indication flashing amber on the upper ECAM display unit:
- Do the procedure after the engine has exceeded the engine operational limits (Ref. AMM TASK 72-00-00-200-008).
(a) If the engine is still operable, continue the troubleshooting.
1 Read the Post Flight Report (PFR) or the Scheduled Maintenance
_ Report (SMR) or Class 3 Report or the FADEC Last Leg Report and check for the FMV, HMU, N1 SNSR, VSV, PS3 failure messages (Ref. AMM TASK 73-21-60-740-007).
a If one or more message is present:
_ - do the troubleshooting related to the failure message(s).
b If nothing is found:
_
- replace the Hydromechanical Unit (HMU) (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
(2) If the N1 overlimit is not confirmed through the data contained in the Specific Data Report (Ref. AMM TASK 73-21-60-740-027) or AIDS data, or DFDR data and if the crew did not report the N1 indication flashing amber on the upper ECAM display unit or actual N1 exceedance.
- Do a check of the FWC part number via the LRU identification screen on the MCDU (Ref. AMM TASK 31-32-00-860-001). If the FWC part number is 350E017248685, the warning is spurious and should be disregarded.
- no further maintenance action is required.
B. Do a minimum idle check (Ref. AMM TASK 71-00-00-710-006).
(1) No additional maintenance action is required if the fault is not confirmed.
(2) Repeat the fault isolation procedure if the fault continues.
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Engine Overspeed Display
Figure 201/TASK 77-00-00-991-004
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TASK 77-00-00-810-851
N2 Overlimit on Engine 1 or 2
1. Possible Causes
_______________
- Hydromechanical Unit (HMU)
- ECU (4000KS)
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 31-32-00-860-001 Procedure to Get Access to the SYSTEM REPORT/TEST
Menu Page AMM 71-00-00-710-006 Minimum Idle Check AMM 72-00-00-200-008 Inspection/Check After the Engine has Exceeded the
Operational Limits AMM 73-21-10-000-002 Removal of the Hydromechanical Unit (HMU) AMM 73-21-10-400-002 Installation of the Hydromechanical Unit (HMU) AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU) AMM 73-21-60-400-001 Installation of the Electronic Control Unit (ECU) AMM 73-21-60-740-007 Correct Time Limited Faults (Non Asterisked) of the
Engine Scheduled Maintenance Report AMM 73-21-60-740-027 Read the Specific Data Report
3. Fault Confirmation
__________________
A. Test
(1) On the MCDU, read (if available) the Specific Data Report (Ref. AMM TASK 73-21-60-740-027) to note the max N2 value that was recorded during the event as well as the duration of the exceedence (if available from crew report). If not, read or get the data from the DFDR or QAR.
- if no overspeed has been recorded, no further action is necessary.
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A. Do this procedure:
NOTE : The ECAM warning is triggered if the indicated N2 is greater than
____ 104 percent.
(1) If the N2 overlimit is confirmed through the data contained in the Specific Data Report(s) (Ref. AMM TASK 73-21-60-740-027) or AIDS data, or DFDR data and if the Crew reported the N2 indication flashing amber on the upper ECAM display unit: 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 发动机指示(75)
