DOC AIRBUS | TSM A320FFailure of the Thrust Reverser Actuator LVDT (Channel B) on Engine 1
1. Possible Causes
· LVDT-THRUST REV UPPER R ACTUATOR ( 4003KS )
· wiring from the thrust reverser upper right actuator LVDT (4003KS) to the EEC (4000KS)
· EEC ( 4000KS )
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
Ref. AMM 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power
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 70-23-15-912-010 Connection of Electrical Connectors
Ref. AMM 71-13-00-410-010 Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
Ref. AMM 71-50-00-210-010 Wire Harness Visual Inspection - All Power Plant Electrical Cables
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. ASM 73-25-16
Ref. AMM 78-30-00-820-010 Rig of the Thrust Reverser System
Ref. AMM 78-31-00-710-041 Operational Test of the Thrust Reverser System with the CFDS
Ref. AMM 78-32-00-410-010 Closing of the Thrust Reverser Halves
Ref. AMM 78-32-48-000-010 Removal of the C-Duct Non-Locking Actuator
Ref. AMM 78-32-48-400-010 Installation of the C-Duct Non-Locking Actuator
Failure of the Thrust Reverser Actuator LVDT (Channel B) on Engine 1 SHEET 1
Figure 78(IAE)-30-00-991-00400-A / SHEET 1/1 - Failure of the Thrust Reverser Actuator LVDT
(Channel B) on Engine 1 not printed, as per printing preferences
3. Fault Confirmation
Subtask 78-30-00-860-144-A
A. Job Set-up
(1) Energize the aircraft electrical circuits
Ref. AMM 24-41-00-861-002 .
(2) On the panel 50VU, release the ENG FADEC GND PWR/1 pushbutton switch.
Subtask 78-30-00-710-248-A
B. Test
(1) On the panel 50VU, push the ENG FADEC GND PWR/1 pushbutton switch and release it again.
NOTE: This action resets the FADEC memory.
(2) Do the operational test of the thrust reverser system with the CFDS (through FADEC 1A and 1B
menus) Ref. AMM 78-31-00-710-041 .
4. Fault Isolation
(Ref. Fig. Failure of the Thrust Reverser Actuator LVDT (Channel B) on Engine 1 SHEET 1)
Subtask 78-30-00-810-166-A
A. If the test gives the maintenance message REV LVDT CHB/HC/EEC1:
· read the fault code shown on the FLIGHT DATA and GROUND DATA of the FADEC (1A and 1B) menu
on the MCDU (Ref. 70-00-00 Page Block 301 Task Supporting Data).
· make a record of the fault code.
(1) If the FADEC 1B menu gives the fault code REVXCW:
· do a check of and adjust, if necessary, the rigging of the thrust reverser system Ref.
AMM 78-30-00-820-010 .
(2) If the fault continues or if the FADEC 1B menu gives the fault code REVLFF:
· examine the harness Ref. AMM 71-50-00-210-010 from the EEC (4000KS) to the thrust reverser
upper right actuator LVDT (4003KS) Ref. ASM 73-25-16.
· disconnect the connector from the thrust reverser upper right actuator LVDT (4003KS)
· examine the connector and receptacle Ref. AMM 71-50-00-210-010 .
· connect the connector to the thrust reverser upper right actuator LVDT (4003KS) Ref.
AMM 70-23-15-912-010 .
(3) If the fault continues:
· replace the LVDT-THRUST REV UPPER R ACTUATOR ( 4003KS ) Ref. AMM 78-32-48-000-010
and Ref. AMM 78-32-48-400-010 .
(4) If the fault continues:
· disconnect the electrical harness connector (4000KS-J10) from the EEC (4000KS)
· at the electrical connector (4000KS-J10) do a check of the resistance between:
. pins N and f (364 to 555 ohms)
. pins g and h (460 to 688 ohms)
(a) If the resistance between the pins N and f is not between 364 and 555 ohms:
· do a check and repair the wiring from the thrust reverser upper right actuator LVDT (4003KS)
to the EEC (4000KS) : pins A/3, 4 to pins J10/N, f Ref. ASM 73-25-16.
(b) If the resistance between the pins g and h is not between 460 and 688 ohms:
· do a check and repair the wiring from the thrust reverser upper right actuator LVDT (4003KS)
to the EEC (4000KS) : pins A/2, 1 to pins J10/g, h Ref. ASM 73-25-16.
(c) Connect the electrical connector (4000KS-J10) to the EEC (4000KS) Ref.
AMM 70-23-15-912-010 .
(5) If the fault continues:
· replace the EEC ( 4000KS ) Ref. AMM 73-22-34-000-010 and Ref. AMM 73-22-34-400-010 .
Subtask 78-30-00-710-249-A
B. Do the test given in Para. 3.
5. Close-up
Subtask 78-30-00-860-145-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) On the panel 50VU, push the ENG FADEC GND PWR/1 pushbutton switch.
(3) De-energize the aircraft electrical circuits
Ref. AMM 24-41-00-862-002 .
(4) Make sure that the thrust reverser halves 451AL and 452AR are closed Ref.
AMM 78-32-00-410-010 .
(5) Make sure that the fan cowls 437AL and 438AR are closed Ref. AMM 71-13-00-410-010 . [Rev.6 from Feb 2017] 2026.04.04 04:38:08 UTC