Right Upper Primary Lock Position Failed Unlocked

TASK 78-31-00-810-971-A
Right Upper Primary Lock Position Failed Unlocked

1. Possible Causes

R UPPER ACTUATOR [3042KM1]
[3410KM1]
[3410KM2]
flex shaft
HARNESS - RIGHT TRAS [4132KS]
HARNESS - PYLON T/R [4130KS]
PROX SENSOR-R T/R UPPER PRIMARY LOCK, CHAN A [4033KS]
PROX SENSOR-R T/R UPPER PRIMARY LOCK, CHAN B [4041KS]
[4000KS]

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	PLIERS - JAWED, SOFT

B. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 71-00-00-810-843-A	Nacelle Component and Harness Troubleshooting Procedure for Guidance Troubleshooting Intermittent Faults
AMM 71-13-00-010-802	Opening of the Fan Cowl Doors
AMM 71-13-00-410-802	Closing of the Fan Cowl Doors
AWM 715178
AWM 715179
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 78-31-00-210-802	General Visual Inspection (GVI) of the Proximity Sensor Targets
AMM 78-31-00-710-805	Operational Test of Thrust Reverser with MCDU
AMM 78-31-04-000-801	Removal of the TRAS Locking-Feedback Actuator
AMM 78-31-04-400-801	Installation of the TRAS Locking-Feedback Actuator
AMM 78-31-07-000-801	Removal of the Flex Shaft
AMM 78-31-07-400-801	Installation of the Flex Shaft
AMM 78-31-20-000-801	Removal of the TRAS Actuator Proximity-Sensors
AMM 78-31-20-400-801	Installation of the TRAS Actuator Proximity-Sensors
AMM 78-31-61-000-812	Removal of the Right TRAS Monitoring Harness
AMM 78-31-61-000-813	Removal of the Pylon TRAS Monitoring Harness
AMM 78-31-61-400-812	Installation of the Right TRAS Monitoring Harness
AMM 78-31-61-400-813	Installation of the Pylon TRAS Monitoring Harness
AMM 78-32-00-210-810	Detailed Inspection of Thrust Reverser, Primary Sliders and Tracks
AMM 78-32-00-860-802	Manual Extension of the Thrust-Reverser Translating Sleeves
AMM 78-32-00-860-803	Manual Retraction of the Thrust-Reverser Translating Sleeves
AMM 78-32-02-000-802	Removal of the Right Thrust Reverser Half - Engine 1
AMM 78-32-02-000-803	Removal of the Right Thrust Reverser Half - Engine 2
AMM 78-32-02-400-802	Installation of the Right Thrust Reverser Half - Engine 1
AMM 78-32-02-400-803	Installation of the Right Thrust Reverser Half - Engine 2

3. Fault Confirmation
Subtask 78-31-00-710-286-A ** ON A/C NOT FOR ALL

A. Do the operational test of the thrust reverser with the MCDU to confirm this fault AMM 78-31-00-710-805.
(1) If the maintenance message does not come back, troubleshoot as described in the nacelle component and harness troubleshooting procedure for guidance troubleshooting intermittent faults (Ref. TSM TASK 71-00-00-810-843).
(a) Monitor the engine for reoccurring maintenance message.
(2) If the maintenance message comes back (hard fault), go to the Para. Fault Isolation.

4. 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.

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 78-31-00-810-315-A ** ON A/C NOT FOR ALL

A. If there is confirmation of the fault:
(1) Get access to right hand upper locking feedback actuator (3042KM1) and EEC (4000KS):
(a) Open the fan cowl doors AMM 71-13-00-010-802.
(2) On actuator, at proximity sensors (4033KS) and (4041KS), make sure that the target is not missing and do a visual inspection of the target for bend, breakage or damage AMM 78-31-00-210-802.
(a) If you find a bend, breakage or other damage, or if the target is missing:
1 Replace R UPPER ACTUATOR [3042KM1] AMM 78-31-04-000-801 and AMM 78-31-04-400-801.
2 Do the test given in Para. 3.
(3) If you find no damage to the target or if the fault continues, check if the target is in unlocked position.
(4) If yes, check the actuator rod end is correctly attached to translating sleeve fitting.
(a) Correct attachment if necessary AMM 78-31-04-400-801.
(b) Do the test given in Para. 3.
(5) If attachment is correct or the fault continues, manually extend the translating sleeve AMM 78-32-00-860-802.
(a) Make sure that the right translating sleeve and actuator move smoothly.
(b) Inspect the primary sliders and tracks AMM 78-32-00-210-810.
1 If you find damage:
a For ENG 1: replace [3410KM1] AMM 78-32-02-000-802 and AMM 78-32-02-400-802.
b For ENG 2: replace [3410KM2] AMM 78-32-02-000-803 and AMM 78-32-02-400-803.
(c) Manually retract the translating sleeve AMM 78-32-00-860-803.
1 If movements of both actuators are not synchronized:
a Replace flex shaft AMM 78-31-07-000-801 and AMM 78-31-07-400-801.
(d) If you do not find any damage:
1 Replace R UPPER ACTUATOR [3042KM1] AMM 78-31-04-000-801 and AMM 78-31-04-400-801.
2 Do the test given in Para. 3.
(6) If the target is in locked position or if the fault continues:
(a) Check for the correct engagement of connectors (4033KS-A) and (4041KS-A).
1 Repair as necessary.
2 Do the test given in Para. 3.
(7) If check is OK or if the fault continues, use a PLIERS - JAWED, SOFT to disconnect connectors (4033KS-A) and (4041KS-A) and do a visual inspection of the connector for bent pins, contamination or corrosion or other signs of damage.
(a) If you find damage:
1 Replace HARNESS - RIGHT TRAS [4132KS] AMM 78-31-61-000-812 and AMM 78-31-61-400-812.
2 Reconnect all connectors.
3 Do the test given in Para. 3.
(8) If you find no damage, disconnect connectors (4054VC-A) and (4055VC-A) AWM 715178 and AWM 715179.
(a) Do a visual inspection of the connector for bent pins, contamination or corrosion or other signs of damage.
(b) Do a continuity check (less than 5 ohms) between the pins of connectors (4033KS-A) and (4054VC) as follows:

Pin 2 and pin 4
Pin 5 and pin 13
Pin 3 and pin 14.

Pin 2 and pin 4
Pin 5 and pin 13
Pin 3 and pin 14.

(d) Do a check of each wire for wire-to-wire, short circuit and short to ground.
(e) If you find a fault:
1 Replace HARNESS - RIGHT TRAS [4132KS] AMM 78-31-61-000-812 and AMM 78-31-61-400-812.
2 Reconnect all connectors.
3 Do the test given in Para. 3.
(9) If you find no damage, disconnect connectors (491VC-A) and (494VC-A) AWM 715178 and AWM 715179.
(a) Do a visual inspection of the connectors for bent pins, contamination or corrosion or other signs of damage.
(b) Do a continuity check (less than 5 ohms) between the pins of connectors (4054VC-A) and (491VC) as follows:

Pin 4 and pin 32
Pin 13 and pin 14
Pin 14 and pin 31.

Pin 4 and pin 32
Pin 13 and pin 14
Pin 14 and pin 31.

(d) Do a check of each wire for wire-to-wire, short circuit and short to ground.
(e) If you find a fault:
1 Replace HARNESS - PYLON T/R [4130KS] AMM 78-31-61-000-813 and AMM 78-31-61-400-813.
2 Reconnect all connectors.
3 Do the test given in Para. 3.
(10) If you find no damage on wirings or if the fault continues, replace both proximity sensors.
(a) Replace PROX SENSOR-R T/R UPPER PRIMARY LOCK, CHAN A [4033KS] AMM 78-31-20-000-801 and AMM 78-31-20-400-801, and
(b) Replace PROX SENSOR-R T/R UPPER PRIMARY LOCK, CHAN B [4041KS] AMM 78-31-20-000-801 and AMM 78-31-20-400-801.
(c) Do the test given in Para. 3.
(11) If the fault continues:
(a) Replace [4000KS] AMM 73-21-01-000-801 and AMM 73-21-01-400-801.
1 Do the test given in Para. 3.

5. Close-up
Subtask 78-31-00-860-081-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.
(a) Close the fan cowl doors AMM 71-13-00-410-802.

[Rev.8 from Aug 2018] 2026.04.04 04:38:17 UTC