Loss of the Signal of the Thrust-Reverser Blocker-Door Deploy/Stow Switches on Engine 1

TASK 78-31-00-810-845-A
Loss of the Signal of the Thrust-Reverser Blocker-Door Deploy/Stow Switches on Engine 1

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 78-31-00-810-839-A	Thrust-Reverser Blocker-Door Stow-Switches Feedback Disagree on Engine 1
TSM TASK 78-31-00-810-843-A	Thrust-Reverser Blocker-Door Deploy-Switches Feedback Disagree on Engine 1
AMM 78-31-00-710-040	Operational Test of the Thrust Reverser System
AMM 78-31-00-710-042	Operational Test of the Thrust Reverser System

3. Fault Confirmation
Subtask 78-31-00-710-136-A ** ON A/C NOT FOR ALL

A. Do the operational test of the thrust reverser system (1A and 1B) AMM 78-31-00-710-040.

Subtask 78-31-00-710-136-B ** ON A/C NOT FOR ALL

A. Do the operational test of the thrust reverser system (1A and 1B) AMM 78-31-00-710-042.

4. Fault Isolation
Subtask 78-31-00-810-094-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message DPLSTW SW J5/J6, ECU through the channel A or B:

NOTE: A fault has been detected which cannot be isolated to the thrust-reverser blocker-door deploy and/or stow-switch circuits

do the procedures as given with the CFDS messages below:
. DEPL SW, J5/J6, ECU (Ref. TSM TASK 78-31-00-810-843) and
. STOW SW, J5/J6, ECU (Ref. TSM TASK 78-31-00-810-839).

[Rev.8 from Aug 2018] 2026.04.04 04:38:02 UTC