Deactivation of the Thrust Reverser System [CFMB]

TASK 78-30-00-040-040-B
Deactivation of the Thrust Reverser System

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

CAUTION: NEVER BLANK OFF HYDRAULIC CONTROL UNIT (HCU) RETURN HOSE AND RELEASE AIRCRAFT (EVEN IF THRUST REVERSER IS DEACTIVATED). THIS ACTION MAY RESULT IN THRUST REVERSER SYSTEM PRESSURIZATION.

ZONE: 210
ZONE: 400
FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL

1. Reason for the Job
MMEL 78-30-01A
THRUST REVERSER
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 1M(3 FT)
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.19 and 0.16 m.daN (16.81 and 14.16 lbf.in )
No specific	Torque wrench: range to between 0.45 and 0.33 m.daN (39.82 and 29.20 lbf.in )
No specific	Torque wrench: range to between 0.70 and 0.65 m.daN (61.95 and 57.52 lbf.in )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
400	POWER PLANT, NACELLES AND PYLONS
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-B	Closing of the Fan Cowl Doors
TASK 73-29-00-710-040-B-02	Operational Test of the FADEC on the Ground (with Engine Non motoring)
TASK 73-29-00-860-801-A	Change of the Inhibition Status of the Thrust Reverser System
TASK 78-31-00-710-042-A	Operational Test of the Thrust Reverser System
TASK 78-31-17-000-001-A	Removal of the Blocker Door Deploy-Switch
TASK 78-31-17-400-001-A	Installation of the Blocker Door Deploy-Switch
TASK 78-31-18-000-001-A	Removal of the Blocker Door Stow-switch
TASK 78-31-18-400-001-A	Installation of the Blocker Door Stow-switch
Hydraulic-Control-Unit (HCU) Operating Control Lever (Operational/Inhibit Position)
Lockout Fairing and Storage Bracket
Lockout Bolt and Lockplate

3. Job Set-up
Subtask 78-30-00-941-050-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).

Subtask 78-30-00-010-050-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors: (Ref. AMM TASK 71-13-00-010-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.

4. Procedure
Subtask 78-30-00-040-050-B ** ON A/C NOT FOR ALL

A. Thrust Reverser Deactivation.

WARNING: MAKE SURE THAT THE THRUST REVERSER IS LOCKED. IF NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE INJURY TO PERSONNEL AND/OR DAMAGE TO THE REVERSER.

(1) Do a check of the primary lock, as follows:
(a) Make sure the blocker doors are closed and flush with the thrust reverser structure.
(b) Pull the blocker door with your hand to make sure the door cannot open.
(2) Make the Thrust Reverser Unserviceable.

Hydraulic-Control-Unit (HCU) Operating Control Lever (Operational/Inhibit Position) ** ON A/C NOT FOR ALL

(a) Remove the quick-release pin from the operational position on the HCU (see sheet.1).
(b) Move the inhibit lever from the operational position to the OFF position.
(c) Install the quick-release pin to hold the inhibit lever in the OFF position (see sheet.2).
(3) Do a test of the deploy switches and make sure that they are operative.
(a) Do an operational test of the thrust reverser system through the Centralized Fault Display System (CFDS) (Ref. AMM TASK 78-31-00-710-042) and when the throttle control lever is in the reverse position:

check that the green or amber REV indication in the N1 indicator of the engine 1(2) does not appears
the ECAM warning ENG 1(2) REVERSER FAULT appears
check the T/R test report:

1 If the following message is present, replace the four deploy switches (Ref. AMM TASK 78-31-17-000-001) and (Ref. AMM TASK 78-31-17-400-001) and do the test again:

"DEPL SW, J5/J6,ECU"

2 If the following message is present, replace the four stow switches (Ref. AMM TASK 78-31-18-000-001) and (Ref. AMM TASK 78-31-18-400-001) and do the test again:

"STOW SW, J5/J6,ECU"

3 If the following message is present, replace the four deploy switches (Ref. AMM TASK 78-31-17-000-001), (Ref. AMM TASK 78-31-17-400-001) and the four stow switches (Ref. AMM TASK 78-31-18-000-001), (Ref. AMM TASK 78-31-18-000-001) and do the test again:

"DPLSTW SW,J5/6,ECU"

4 If the ECAM warning ENG 1(2) REV PRESSURIZED appears together with one of the following messages, do the troubleshooting procedure relative to the triggered maintenance messages:

"HCU(TRPV OPEN)" or "HCU(TRPV), HYD"

5 If one of the following messages is present, troubleshoot and do the test again:

"EIU,HCU" or "TR LOCK, TR ACT" or "TR LOCK, TR ACT DPLSW"

6 If the message "HCU (TRPV), HYD" or "HCU, TRSOV, HYD" is present and if there is no other message above mentioned, continue the deactivation procedure.

NOTE: The maintenance messages linked to the fault(s) occurred before the deactivation, can be recorded in this T/R test report.

(4) Deactivation of the thrust reverser.

Lockout Fairing and Storage Bracket ** ON A/C NOT FOR ALL

Lockout Bolt and Lockplate ** ON A/C NOT FOR ALL

(a) Remove the bolts (3) that attach the lockplates (2) to the storage bracket (4).
(b) Remove the lockplates (2) from the storage bracket (4).
(c) Remove the lockout bolts (1) from the storage bracket (4).
(d) Remove the screws (5) that attach the lockout fairings (6) to the blocker doors.
(e) Attach the lockout fairings (6) to the storage bracket (4) with the screws (5).
(f) TORQUE screws (5) to between 0.19 and 0.16 m.daN (16.81 and 14.16 lbf.in )

(g) Install the lockout bolts (1) on the blocker doors.

Lockout Bolt and Lockplate ** ON A/C NOT FOR ALL

NOTE: Make sure that a conical washer is installed on the lockout bolt (1).

(h) TORQUE the lockout bolts (1) to between 0.70 and 0.65 m.daN (61.95 and 57.52 lbf.in )

.
(5) Put the lockplates (2) over the lockout bolts (1) and install the bolts (3).
(6) TORQUE the bolts (3) to between 0.45 and 0.33 m.daN (39.82 and 29.20 lbf.in )

Subtask 78-30-00-410-050-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the access platform(s).
(3) Close the fan cowl doors: (Ref. AMM TASK 71-13-00-410-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(4) Remove the WARNING NOTICE(S).

Subtask 78-30-00-710-051-A ** ON A/C NOT FOR ALL

C. Do a FADEC ground test (Engine Non Motoring) (Ref. AMM TASK 73-29-00-710-040).
(1) Make sure that these fault messages are not in view:

"STOW SW, J5/J6,ECU" or "DEPL SW,J5/J6,ECU" or "DPLSTW SW,J5/6,ECU"

Subtask 78-30-00-710-072-A ** ON A/C NOT FOR ALL

D. Do an operational test of the thrust reverser system through the CFDS (Ref. AMM TASK 78-31-00-710-042).
(1) Make sure that the ENG1(2) REVERSE UNLOCKED and the ENG1(2) REV PRESSURIZED warnings do not come into view.

Subtask 78-30-00-710-059-A ** ON A/C NOT FOR ALL

E. Change the Rev Inhibition Status

CAUTION: MAKE SURE THAT THE AIRCRAFT IS FITTED WITH ECU 5BS OR SUBSEQUENT, AND WITH FWC H2F6 OR SUBSEQUENT.

(1) Change the rev inhibition status of the thrust reverser system from NOT INHIBITED to INHIBITED (Ref. AMM TASK 73-29-00-860-801).

5. Close-up
Subtask 78-30-00-941-051-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) In the cockpit, install a WARNING NOTICE(S) to show the reverser cannot operate.
(2) Make an entry in the log book.

[Rev.10 from 2021] 2026.04.01 03:23:51 UTC