Functional Test of the Pressure-Off Brakes

TASK 27-44-54-720-001-A
Functional Test of the Pressure-Off Brakes

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

ZONE: 310

1. Reason for the Job
Refer to the MPD TASK: 274400-01
FUNCTIONAL CHECK OF THS ACTUATOR PRESSURE OFF BRAKE (APPLY TORQUE TO MANUAL CRANKING INPUT)
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 10.0 and 1.0 m.daN (884.96 and 88.50 lbf.in )
No specific	Torque wrench: range to between 1.6 and 1.4 m.daN (11.80 and 10.32 lbf.ft )
0U145506	1	CONE-MOUNTING, THS ACTUATOR

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03ABB1)	Synthetic base Lubricating Oil-Turbine Engine Low Temp. -
No specific	lockwire 0.6 mm (0.024 in.)

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
310	FUSLG TAIL SECTION AFT OF AFT PRESS BHD
312AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
4	O-RING	AIPC 27-44-51-02-100

E. Referenced Information

REFERENCE	DESIGNATION
TASK 27-44-51-000-001-A	Removal of the Trimmable Horizontal Stabilizer (THS) Actuator (for corrective action)
TASK 27-44-51-400-001-A	Installation of the Trimmable Horizontal Stabilizer (THS) Actuator (for corrective action)
Functional Test of the Pressure-Off Brakes

3. Job Set-up
Subtask 27-44-54-010-051-A

A. Get Access
(1) Put the WARNING NOTICE(S) in the cockpit to tell persons not to operate the pitch controls.
(2) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position.
(3) Open the access door 312AR.

Subtask 27-44-54-865-053-A

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/ELAC1/NORM/SPLY	15CE1	B11
49VU	FLIGHT CONTROLS/THS/ACTR/MOT2	19CE2	B09
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/ELAC1/NORM/SPLY	15CE1	B06
49VU	FLIGHT CONTROLS/THS/ACTR/MOT2	19CE2	B04
** ON A/C ALL
105VU	FLT CTL/ELAC1/STBY SPLY	16CE1	A01
121VU	FLIGHT CONTROLS/THS ACTR/MOT3	19CE3	Q17
121VU	FLIGHT CONTROLS/THS ACTR/MOT1	19CE1	Q16

4. Procedure
Subtask 27-44-54-720-051-A

A. Functional Test of the Pressure-Off Brakes (2):
(1) Cut and remove the lockwire which safeties the plug (3) to the screw (5) at the THS actuator motor (6).
(2) Remove the plug (3) from the manual drive input of the THS actuator (1).
(3) Remove and discard the O-ring (4) from the plug (3).
(4) Use a torque wrench to between 10.0 and 1.0 m.daN (884.96 and 88.50 lbf.in )

for the subsequent test.
(5) Put the torque wrench in position at the manual drive input, apply a torque of minimum 7.2 m.daN (53.10 lbf.ft). Make sure that the pressure-off brakes do not move.

NOTE: The static break-out torque must be a minimum of 7.2 m.daN (53.10 lbf.ft).

If the static break-out torque is between 6.5 m.daN (47.94 lbf.ft) and 7.2 m.daN (53.10 lbf.ft), replace the THS actuator in less than 600FH or 750FC or 100 days (Ref. AMM TASK 27-44-51-000-001) and (Ref. AMM TASK 27-44-51-400-001). Do the replacement in the limits that come first.
If the static break-out torque is less than 6.5 m.daN (47.94 lbf.ft), replace the THS actuator before next flight (Ref. AMM TASK 27-44-51-000-001) and (Ref. AMM TASK 27-44-51-400-001).

(6) Remove the torque wrench.
(7) Apply Synthetic base Lubricating Oil-Turbine Engine Low Temp. - (Material No.03ABB1) to the new AIPC 27-44-51-02-100 O-RING (4).
(8) Use the 0U145506 CONE-MOUNTING, THS ACTUATOR and put the O-ring (4) on the plug (3).
(9) Install the plug (3) in the manual drive input.
(10) TORQUE the plug (3) to between 1.6 and 1.4 m.daN (11.80 and 10.32 lbf.ft )

.
(11) Safety the plug (3) to the screw (5) at the motor (6) with lockwire 0.6 mm (0.024 in.).

5. Close-up
Subtask 27-44-54-865-054-A

A. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/ELAC1/NORM/SPLY	15CE1	B11
49VU	FLIGHT CONTROLS/THS/ACTR/MOT2	19CE2	B09
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/ELAC1/NORM/SPLY	15CE1	B06
49VU	FLIGHT CONTROLS/THS/ACTR/MOT2	19CE2	B04
** ON A/C ALL
105VU	FLT CTL/ELAC1/STBY SPLY	16CE1	A01
121VU	FLIGHT CONTROLS/THS ACTR/MOT3	19CE3	Q17
121VU	FLIGHT CONTROLS/THS ACTR/MOT1	19CE1	Q16

Subtask 27-44-54-410-051-A

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access door 312AR.
(3) Remove the WARNING NOTICE(S).
(4) Remove the access platform(s).

[Rev.10 from 2021] 2026.03.31 23:51:42 UTC