W DOC AIRBUS | TSM A320F

Fluctuation of N1 or Auto Acceleration or Auto Deceleration or No Throttle Response to TLA Command on Engine 1 or 2

TASK 77-00-00-810-852-A
Fluctuation of N1 or Auto Acceleration or Auto Deceleration or No Throttle Response to TLA Command on Engine 1 or 2

1. Possible Causes
  • T12 Sensor
  • HMU
  • J7 harness
  • J8 harness
  • ECU [4000KS]
  • N1 Sensor
  • N2 Sensor
  • J7 Harness
  • J8 Harness
  • J9 Harness
  • J10 Harness
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 31-32-00-860-012
Procedure to Get Access to the SYSTEM REPORT/TEST/ENG Page
AMM 73-21-10-000-001
Removal of the Hydromechanical Unit (HMU)
AMM 73-21-10-000-002
Removal of the Hydromechanical Unit (HMU)
AMM 73-21-10-400-001
Installation of the Hydromechanical Unit (HMU)
AMM 73-21-10-400-002
Installation of the Hydromechanical Unit (HMU)
AMM 73-21-40-000-001
Removal of the T12 Temperature Sensor
AMM 73-21-40-000-040
Removal of the T12 Temperature Sensor
AMM 73-21-40-400-001
Installation of the T12 Temperature Sensor
AMM 73-21-40-400-040
Installation of the T12 Temperature Sensor
AMM 73-21-50-000-006
Removal of J7 Harness
AMM 73-21-50-000-007
Removal of J8 Harness
AMM 73-21-50-000-008
Removal of the J9 Harness
AMM 73-21-50-000-009
Removal of the J10 Harness
AMM 73-21-50-000-040
Removal of the HJ7 Harness for SAC Engines
AMM 73-21-50-000-041
Removal of the HJ8 Harness for SAC Engines
AMM 73-21-50-000-042
Removal of the HJ9 Harness for SAC Engines
AMM 73-21-50-000-043
Removal of the HJ10 Harness for SAC Engines
AMM 73-21-50-210-001
Visual Inspection of the Wiring Harness
AMM 73-21-50-210-002
Visual Inspection of the Wiring Harnesses
AMM 73-21-50-400-006
Installation of the J7 Harness
AMM 73-21-50-400-007
Installation of the J8 Harness
AMM 73-21-50-400-008
Installation of the J9 Harness
AMM 73-21-50-400-009
Installation of the J10 Harness
AMM 73-21-50-400-040
Installation of the HJ7 Harness for SAC Engines
AMM 73-21-50-400-041
Installation of the HJ8 Harness for SAC Engines
AMM 73-21-50-400-042
Installation of the HJ9 Harness for SAC Engines
AMM 73-21-50-400-043
Installation of the HJ10 Harness for SAC Engines
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 73-29-00-710-040
Operational Test of the FADEC on the ground (with Engine Motoring)
AMM 77-11-10-000-001
Removal of the N1 Speed Sensor
AMM 77-11-10-000-002
Removal of the N1 Speed Sensor
AMM 77-11-10-400-001
Installation of the N1 Speed Sensor
AMM 77-11-10-400-002
Installation of the N1 Speed Sensor
AMM 77-11-20-000-001
Removal of the N2 Speed Sensor
AMM 77-11-20-000-002
Removal of the N2 Speed Sensor .
AMM 77-11-20-400-001
Installation of the N2 Speed Sensor
AMM 77-11-20-400-002
Installation of the N2 Speed Sensor .
3. Fault Confirmation
Subtask 77-00-00-710-129-A ** ON A/C NOT FOR ALL
A. Test
Do the operational test of the FADEC 1A and 1B on the ground (with engine non - motoring) AMM 73-29-00-710-040.
NOTE: If the fluctuation of N1 is reported simultaneously on all Engines, and that the A/C is under MMEL 36-11-02 (PRV secured closed), troubleshoot per TSM 36-11-00 first.
4. Fault Isolation
Subtask 77-00-00-810-108-A ** ON A/C NOT FOR ALL
A. Do this procedure:
NOTE: This procedure is to be used if the crew observes uncommanded fan speed (N1) fluctuations, accelerations, deceleration or there is no response to a throttle command.
   (1) Read the Post Flight Report (PFR) and the Scheduled Maintenance Report (SMR) and/or the Class 3 Report AMM 73-21-60-740-007, and check for the following failure messages:
J7, HMU(FMVRES), ECU
J8, HMU(FMVRES), ECU
T12 SNSR, J9, ECU
T12 SNSR, J10, ECU
N1 SNSR, J9, ECU
N1 SNSR, J10, ECU
N2 SNSR, J7, ECU
N2 SNSR, J8, ECU
PS3 SNSR, ECU
     (a) If one or more of these failure messages are present:
  • Do the troubleshooting procedure according to these messages first.
     (b) If none of these failure messages are present:
  • Continue the troubleshooting as follows.
   (2) Replace the T12 Sensor AMM 73-21-40-000-040 and AMM 73-21-40-400-040.
     (a) Visually examine the J9/J10 harness connectors for damaged pins, contamination AMM 73-21-50-210-001:
       1 If damage on a connector is found:
  • replace or repair as required.
       2 If nothing is found:
  • no further action is required.
         a If the fault continues during the subsequent flights, continue the troubleshooting as follows.
   (3) replace the HMU AMM 73-21-10-000-001 and AMM 73-21-10-400-001.
     (a) Visually examine the J7 and J8 harness connectors for damaged pins, contamination and fuel wetting AMM 73-21-50-210-001.
       1 If damage on a connector is found:
  • replace or repair as required.
       2 If fuel wetting is found:
   (4) On MCDU screen, check ECU P/N AMM 31-32-00-860-012.
     (a) If P/N prefix is 1459M55
       1 If the fault continues during the subsequent flights, continue the troubleshooting as follows.
   (5) Replace the N1 Sensor AMM 77-11-10-000-001 and AMM 77-11-10-400-001 and clean connectors.
     (a) Visually examine the J9/J10 harness connectors for damaged pins, contamination AMM 73-21-50-210-001:
       1 If damage on a connector is found:
  • replace or repair as required.
       2 If nothing is found:
  • no further action is required.
         a If the fault continues during the subsequent flights, continue the troubleshooting as follows.
   (6) Replace the N2 Sensor AMM 77-11-20-000-001 and AMM 77-11-20-400-001 and clean connectors.
     (a) Visually examine the J7/J8 harness connectors for damaged pins, contamination AMM 73-21-50-210-001:
       1 If damage on a connector is found:
  • replace or repair as required.
       2 If nothing is found:
  • no further action is required.
         a If the fault continues during the subsequent flights, continue the troubleshooting as follows.
   (7) Replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001, if not previously replaced.
     (a) Visually examine the harness connectors for damaged pins, contamination AMM 73-21-50-210-001:
       1 If damage on a connector is found:
  • replace or repair as required.
       2 If nothing is found:
  • no further action is required.
         a If the fault continues during the subsequent flights, continue the troubleshooting as follows.
   (8) Replace the J7 Harness AMM 73-21-50-000-006 and AMM 73-21-50-400-006.
     (a) If the fault continues during the subsequent flights, continue the troubleshooting as follows.
   (9) Replace the J8 Harness AMM 73-21-50-000-007 and AMM 73-21-50-400-007.
     (a) If the fault continues during the subsequent flights, continue the troubleshooting as follows.
   (10) Replace the J9 Harness AMM 73-21-50-000-008 and AMM 73-21-50-400-008.
     (a) If the fault continues during the subsequent flights, continue the troubleshooting as follows.
   (11) Replace the J10 Harness AMM 73-21-50-000-009 and AMM 73-21-50-400-009.
Subtask 77-00-00-810-108-B ** ON A/C NOT FOR ALL
A. Do this procedure:
NOTE: This procedure is to be used if the crew observes uncommanded fan speed (N1) fluctuations, accelerations, deceleration or there is no response to a throttle command.
   (1) Read the Post Flight Report (PFR) and the Scheduled Maintenance Report (SMR) and/or the Class 3 Report AMM 73-21-60-740-007, and check for the following failure messages:
J7, HMU(FMVRES), ECU
J8, HMU(FMVRES), ECU
T12 SNSR, J9, ECU
T12 SNSR, J10, ECU
N1 SNSR, J9, ECU
N1 SNSR, J10, ECU
N2 SNSR, J7, ECU
N2 SNSR, J8, ECU
PS3 SNSR, ECU
     (a) If one or more of these failure messages are present:
  • Do the troubleshooting procedure according to these messages first.
     (b) If none of these failure messages are present:
  • Continue the troubleshooting as follows.
   (2) Replace the T12 Sensor AMM 73-21-40-000-001 and AMM 73-21-40-400-001.
     (a) Visually examine the J9/J10 harness connectors for damaged pins, contamination AMM 73-21-50-210-002:
       1 If damage on a connector is found:
  • replace or repair as required.
       2 If nothing is found:
  • no further action is required.
         a If the fault continues during the subsequent flights, continue the troubleshooting as follows.
   (3) replace the HMU AMM 73-21-10-000-002 and AMM 73-21-10-400-002.
     (a) Visually examine the J7 and J8 harness connectors for damaged pins, contamination and fuel wetting AMM 73-21-50-210-002.
       1 If damage on a connector is found:
  • replace or repair as required.
       2 If fuel wetting is found:
   (4) Replace the N1 Sensor AMM 77-11-10-000-002 and AMM 77-11-10-400-002 and clean connectors.
     (a) Visually examine the J9/J10 harness connectors for damaged pins, contamination AMM 73-21-50-210-002:
       1 If damage on a connector is found:
  • replace or repair as required.
       2 If nothing is found:
  • no further action is required.
         a If the fault continues during the subsequent flights, continue the troubleshooting as follows.
   (5) Replace the N2 Sensor AMM 77-11-20-000-002 and AMM 77-11-20-400-002 and clean connectors.
     (a) Visually examine the J7/J8 harness connectors for damaged pins, contamination AMM 73-21-50-210-002:
       1 If damage on a connector is found:
  • replace or repair as required.
       2 If nothing is found:
  • no further action is required.
         a If the fault continues during the subsequent flights, continue the troubleshooting as follows.
   (6) Replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.
     (a) Visually examine the harness connectors for damaged pins, contamination AMM 73-21-50-210-002:
       1 If damage on a connector is found:
  • replace or repair as required.
       2 If nothing is found:
  • no further action is required.
         a If the fault continues during the subsequent flights, continue the troubleshooting as follows.
   (7) Replace the J7 Harness AMM 73-21-50-000-040 and AMM 73-21-50-400-040.
     (a) If the fault continues during the subsequent flights, continue the troubleshooting as follows.
   (8) Replace the J8 Harness AMM 73-21-50-000-041 and AMM 73-21-50-400-041.
     (a) If the fault continues during the subsequent flights, continue the troubleshooting as follows.
   (9) Replace the J9 Harness AMM 73-21-50-000-042 and AMM 73-21-50-400-042.
     (a) If the fault continues during the subsequent flights, continue the troubleshooting as follows.
   (10) Replace the J10 Harness AMM 73-21-50-000-043 and AMM 73-21-50-400-043.
Subtask 77-00-00-710-130-A ** ON A/C NOT FOR ALL
B. Do the test given in Para. 3.A.
   (1) No additional maintenance action is required if the fault is not confirmed.
   (2) Repeat the fault isolation procedure if the fault continues.
[Rev.8 from Aug 2018] 2026.04.04 04:38:45 UTC
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