DOC AIRBUS | TSM A320FStarter Speed (NS) in Signal Failure Channel A
TASK 80-11-00-810-821-A
Starter Speed (NS) in Signal Failure Channel A
1. Possible Causes
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Fault Confirmation
Subtask 80-11-00-710-084-A ** ON A/C NOT FOR ALL
Subtask 80-11-00-860-050-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:38:42 UTC
Starter Speed (NS) in Signal Failure Channel A
1. Possible Causes
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | MULTIMETER - STANDARD |
| No specific | 1 | PLIERS - JAWED, SOFT |
| REFERENCE | DESIGNATION |
|---|---|
| TSM TASK 71-00-00-810-834-A | General Troubleshooting Guidelines for Additional Troubleshooting Information |
| TSM TASK 71-00-00-810-835-A | Component and Harness Intermittent Troubleshooting Procedure for Guidance Troubleshooting Intermittent Faults |
| AMM 70-70-00-910-803 | SPOP 6 - Cleaning of the Contact Points and Wiring Harnesses |
| AMM 71-00-00-860-814 | Shutdown of the Engine |
| AMM 71-00-00-860-822 | Start the Engine (Normal Manual Start) |
| AMM 71-00-00-860-823 | Start the Engine (Normal Automatic Start) |
| AMM 73-21-01-000-801 | Removal of the Electronic Engine Control (EEC) |
| AMM 73-21-01-400-801 | Installation of the Electronic Engine Control (EEC) |
| AMM 73-21-64-000-802 | Removal of the Electronic Engine Control (EEC) Wiring Harness (W04) |
| AMM 73-21-64-400-802 | Installation of the Electronic Engine Control (EEC) Wiring Harness (W04) |
| AMM 73-21-68-000-802 | Removal of the EEC Wiring Harness (WC08) |
| AMM 73-21-68-400-802 | Installation of the EEC Wiring Harness (WC08) |
| AMM 78-36-00-010-802 | Opening of the Thrust Reverser Cowl-Doors |
| AMM 78-36-00-410-802 | Closing of the Thrust Reverser Cowl-Doors |
| AMM 80-11-01-000-801 | Removal of the Starter |
| AMM 80-11-01-400-801 | Installation of the Starter |
EEC Wiring HarnessesSubtask 80-11-00-710-084-A ** ON A/C NOT FOR ALL
A. Do an engine run to idle to confirm repair of this fault AMM 71-00-00-860-822 or AMM 71-00-00-860-823.
(1) Shutdown the engine AMM 71-00-00-860-814.
(2) On Multipurpose Control and Display Unit (MCDU) screen, check if the fault is displayed on ground scanning report.
(a) If no problems are found, return the engine to service. Monitor the engine for reoccurring maintenance message.
(4) If the maintenance message comes back (hard fault), go to the Para. Fault Isolation.
4. Fault Isolation(1) Shutdown the engine AMM 71-00-00-860-814.
(2) On Multipurpose Control and Display Unit (MCDU) screen, check if the fault is displayed on ground scanning report.
NOTE: The Electronic Engine Control (EEC) has detected the circuit for the starter speed sensor is out of range or rate in channel A. The starter speed sensor is mounted on the starter, which is attached to the rear of the main gearbox at the 8 o'clock position.
(3) If the maintenance message does not come back, examine the harnesses and electrical connectors as described in the component and harness intermittent fault isolation procedure (Ref. TSM TASK 71-00-00-810-835). - Refer to the general troubleshooting guidelines for additional troubleshooting information (Ref. TSM TASK 71-00-00-810-834).
- Refer to the component and harness intermittent troubleshooting procedure for guidance troubleshooting intermittent faults (Ref. TSM TASK 71-00-00-810-835).
(a) If no problems are found, return the engine to service. Monitor the engine for reoccurring maintenance message.
(4) If the maintenance message comes back (hard fault), go to the Para. Fault Isolation.
WARNING:
BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS WARNING, INJURY CAN OCCUR.
WARNING:
REFER TO THE MSDS FOR ALL MATERIAL USED AND THE MANUFACTURER'S SAFETY INSTRUCTIONS FOR ALL EQUIPMENT USED. IF YOU DO NOT OBEY THIS WARNING, INJURY CAN OCCUR.
CAUTION:
MAKE SURE YOU REMOVE ELECTRICAL POWER FROM THE EEC BEFORE YOU REMOVE THE ELECTRICAL CONNECTORS. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE EEC CAN OCCUR.
Subtask 80-11-00-810-072-A ** ON A/C NOT FOR ALL A. If there is confirmation of the fault:
(1) Open the thrust reverser cowl-doors AMM 78-36-00-010-802.
(2) Examine the W04 (4088KS) and WC08 (4094KS) harnesses, connector P3 (4000KS-P3) - EEC (4000KS), interconnect J108 (4111VC)/P108 (4111VC-A) and connector P30 (100KM-P30) - starter (100KM), for problems which are possible between the EEC (4000KS) and the starter (100KM).
(a) Inspect for harness damage.
(b) Inspect for loose or damaged connectors.
1 Replace W04 HARNESS(4088KS) AMM 73-21-64-000-802 and AMM 73-21-64-400-802, or
2 Replace WC08 HARNESS-CORE(4094KS) AMM 73-21-68-000-802 and AMM 73-21-68-400-802.
3 Do the test given in Para. 3.
(3) If no problems are found with the harnesses, use a PLIERS - JAWED, SOFT to disconnect the electrical connector P3 (4000KS-P3) from the EEC (4000KS), interconnect J108 (4111VC)/P108 (4111VC-A) and connector P30 (100KM-P30) from the starter (100KM).
(a) Examine the pins and sockets (contacts) for alignment and damage. Look for contacts pushed rearward into the connector face. Replace parts as necessary.
(b) Clean the contacts with contact cleaner and clean cloth per SPOP 6. Blow dry with air (at less than 30 psi) across the connector face AMM 70-70-00-910-803.
(c) Reconnect the electrical connector P3 (4000KS-P3) to the EEC (4000KS), interconnect J108 (4111VC)/P108 (4111VC-A) and connector P30 (100KM-P30) to the starter (100KM).
(d) Do the test given in Para. 3.
(4) If the fault continues:
(a) Replace STARTER-PNEUMATIC [100KM] AMM 80-11-01-000-801 and AMM 80-11-01-400-801.
(b) Do the test given in Para. 3.
(5) If the fault continues:
(a) Disconnect the electrical connector P3 (4000KS-P3) from the EEC (4000KS), interconnect J108 (4111VC)/P108 (4111VC-A) and connector P30 (100KM-P30) from the starter (100KM). Use a MULTIMETER - STANDARD to test the stater speed sensor circuits in the harnesses. Refer to Table 1. Look for:
1 Wire-to-wire shorts
2 Shorts to ground
3 Continuity (less than 5 ohms resistance).
(b) If a problem is found with the harnesses or connectors:
1 Replace W04 HARNESS [4088KS] AMM 73-21-64-000-802 and AMM 73-21-64-400-802, or
2 Replace WC08 HARNESS-CORE [4094KS] AMM 73-21-68-000-802 and AMM 73-21-68-400-802.
3 Do the test given in Para. 3.
(6) If the fault continues:
(a) Replace
(b) Do the test given in Para. 3.
5. Close-up(1) Open the thrust reverser cowl-doors AMM 78-36-00-010-802.
(2) Examine the W04 (4088KS) and WC08 (4094KS) harnesses, connector P3 (4000KS-P3) - EEC (4000KS), interconnect J108 (4111VC)/P108 (4111VC-A) and connector P30 (100KM-P30) - starter (100KM), for problems which are possible between the EEC (4000KS) and the starter (100KM).
(a) Inspect for harness damage.
(b) Inspect for loose or damaged connectors.
NOTE: Loose connectors must be disconnected and examined for further wear or damage.
(c) If a problem is found with the harnesses or connectors: 1 Replace W04 HARNESS(4088KS) AMM 73-21-64-000-802 and AMM 73-21-64-400-802, or
2 Replace WC08 HARNESS-CORE(4094KS) AMM 73-21-68-000-802 and AMM 73-21-68-400-802.
3 Do the test given in Para. 3.
(3) If no problems are found with the harnesses, use a PLIERS - JAWED, SOFT to disconnect the electrical connector P3 (4000KS-P3) from the EEC (4000KS), interconnect J108 (4111VC)/P108 (4111VC-A) and connector P30 (100KM-P30) from the starter (100KM).
(a) Examine the pins and sockets (contacts) for alignment and damage. Look for contacts pushed rearward into the connector face. Replace parts as necessary.
(b) Clean the contacts with contact cleaner and clean cloth per SPOP 6. Blow dry with air (at less than 30 psi) across the connector face AMM 70-70-00-910-803.
(c) Reconnect the electrical connector P3 (4000KS-P3) to the EEC (4000KS), interconnect J108 (4111VC)/P108 (4111VC-A) and connector P30 (100KM-P30) to the starter (100KM).
(d) Do the test given in Para. 3.
(4) If the fault continues:
(a) Replace STARTER-PNEUMATIC [100KM] AMM 80-11-01-000-801 and AMM 80-11-01-400-801.
(b) Do the test given in Para. 3.
(5) If the fault continues:
(a) Disconnect the electrical connector P3 (4000KS-P3) from the EEC (4000KS), interconnect J108 (4111VC)/P108 (4111VC-A) and connector P30 (100KM-P30) from the starter (100KM). Use a MULTIMETER - STANDARD to test the stater speed sensor circuits in the harnesses. Refer to Table 1. Look for:
1 Wire-to-wire shorts
2 Shorts to ground
3 Continuity (less than 5 ohms resistance).
NOTE: A short to ground is found when the resistance is less than 100 000 (100K) ohms.
Table 1: Starter Speed Sensor Channel A Connector Contacts | W04 (4088KS) Harness P3 (4000KS-P3) EEC (4000KS) Connector Contacts | W04 (4088KS) Harness J108 (4111VC) Connector Contacts | WC08 (4094KS) Harness P108 (4111VC-A) Connector Contacts | WC08 (4094KS) Harness P30 (100KM-P30) Starter (100KM) Connector Contacts |
|---|---|---|---|
| Z | 34 | 34 | A |
| u | 35 | 35 | B |
1 Replace W04 HARNESS [4088KS] AMM 73-21-64-000-802 and AMM 73-21-64-400-802, or
2 Replace WC08 HARNESS-CORE [4094KS] AMM 73-21-68-000-802 and AMM 73-21-68-400-802.
3 Do the test given in Para. 3.
(6) If the fault continues:
(a) Replace
(b) Do the test given in Para. 3.
Subtask 80-11-00-860-050-A ** ON A/C NOT FOR ALL
A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser cowl-doors AMM 78-36-00-410-802.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser cowl-doors AMM 78-36-00-410-802.