Removal of the Balance Mechanism

TASK 52-22-21-000-005-A
Removal of the Balance Mechanism

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Referenced Information

REFERENCE	DESIGNATION
TASK 25-23-47-000-012-A	Removal of the Door Linings of the LH FWD Emergency Exit Door, zone 231
TASK 25-23-47-000-013-A	Removal of the Door Linings of the RH FWD Emergency Exit Door at zone 251 or RH AFT at zone 252 or LH AFT at zone 232.
TASK 25-23-47-000-802-A	Removal of the Door Linings of the Emergency Exit, zones 251/252
TASK 52-22-00-010-001-A	Opening of the Emergency Exit Doors from the Passenger Compartment
TASK 52-22-00-860-003-A	Special Precaution before Maintenance on the Door Damper and Emergency Operation Cylinder
Balance Mechanism

3. Job Set-up
Subtask 52-22-21-010-064-A ** ON A/C NOT FOR ALL

A. Get Access
(1) Open the applicable emergency exit door (referred to as door) as required (Ref. AMM TASK 52-22-00-010-001).
(2) Make sure that the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE is in position below the partly opened door.
(3) Make sure that the special precaution on the door damper and emergency operation cylinder is completed (Ref. AMM TASK 52-22-00-860-003).

Subtask 52-22-21-865-059-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	EIS/SLIDES/ARM AND WARN/FLT	15WN	P11
121VU	EIS/SLIDES/ARM AND WARN/GND	13WN	P10
121VU	EIS/SDAC1 AND 2/DOOR/DET/PAX	48WV	P05

Subtask 52-22-21-010-056-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Remove the door linings from the door as required (Ref. AMM TASK 25-23-47-000-012) or (Ref. AMM TASK 25-23-47-000-013).
(2) Carefully disengage the VELCRO tapes and remove the insulation mat from the inner side of the door.

Subtask 52-22-21-010-056-B ** ON A/C NOT FOR ALL

C. Get Access
(1) Remove the door linings from the door as required (Ref. AMM TASK 25-23-47-000-802).
(2) Carefully disengage the VELCRO tapes and remove the insulation mat from the inner side of the door.

Subtask 52-22-21-860-053-A ** ON A/C NOT FOR ALL

D. Decrease the tension of the torsion spring as follows:

Balance Mechanism ** ON A/C NOT FOR ALL

(1) Cut and remove the lockwire from the adjustment screw (365).
(2) Loosen the adjustment screw (365) until the pretension lever (356) touches the stop (390).

4. Procedure
Subtask 52-22-21-020-056-D ** ON A/C NOT FOR ALL

A. Removal of the Torsion Bar Assembly

Balance Mechanism ** ON A/C NOT FOR ALL

(1) Disconnect the connection link (386) from the torsion lever (381) as follows:
(a) Remove and discard the cotter pin (382) from the nut (383).
(b) Remove the nut (383), the washers (384), the bush (385) and the bolt (388) from the torsion lever (381).
(c) Disconnect the eye-end of the connection link (386) from the fork-end of the torsion lever (381).
(d) If required, remove the bush (387) from the fork-end of the torsion lever (381).
(2) Remove the retaining rings (354) and (377) from the pretension sleeve (371) and the torsion tube (372).
(3) Release the clamp (393) and remove the bushing halves (392) from the torsion tube (372).
(4) Move the torsion spring (373) through the flange bearing (352) until it comes free from the door member.
(5) Remove the torsion tube (372) as follows:
(a) Release the lock washer (397) and remove the screw (396) from the torsion lever (381).
(b) Remove the torsion lever (381) from its splined area of the torsion tube (372).
(c) Move the torsion tube (372) rearwards until it comes free from the door member.
(d) Remove the torsion tube (372) from the door structure.
(e) If required, remove the nuts (395), the bolts (396) and the flange bearing (389).
(6) Disconnect the pretension rod (364) from the pretension lever (356) as follows:
(a) Remove and discard the cotter pin (363) from the nut (362).
(b) Remove the nut (362), the washers (361), the bush (359) and the bolt (360) from the pretension lever (356).
(c) Disconnect the eye-end of the pretension rod (364) from the fork-end of the pretension lever (356).
(d) If required, remove the bush (358) from the fork-end of the pretension lever (356).
(7) Remove the pretension sleeve (371) as follows:
(a) Remove the nuts (351), the bolts (353) and the flange bearing (352).
(b) Move the pretension sleeve (371) forward until it comes free from the door member.
(c) Remove the washers (368), (369) and (370) from the pretension sleeve (371).

NOTE: Write down the quantity and the sequence of the washers (368), (369) and the (370).

(d) Remove the pretension sleeve (371) with the pretension lever (356) from the door structure.
(e) If required, remove the nut (355), the bolt (357) and the pretension lever (356) from the pretention sleeve (371).
(f) Remove the retaining ring (391) and the stop (390) from the door structure.

Subtask 52-22-21-020-057-A ** ON A/C NOT FOR ALL

B. Removal of the Pretension Unit

Balance Mechanism ** ON A/C NOT FOR ALL

NOTE: Make sure that the tension of the torsion spring is fully decreased.

(1) Disconnect the pretension rod (364) from the pretension lever (356) as follows:
(a) Remove and discard the cotter pin (363) from the nut (362).
(b) Remove the nut (362), the washers (361), the bush (359) and the bolt (360) from the pretension lever (356).
(c) Disconnect the eye-end of the pretension rod (364) from the fork-end of the pretension lever (356).
(d) If required, remove the bush (358) from the fork-end of the pretension lever (356).
(2) Hold the pretension rod (364) and remove the adjustment screw (365) from the bearing fitting (367).
(3) Remove the pretension rod (364) from the bearing fitting (367).
(4) If required, remove the spherical bearing (366) from the bearing fitting (367).
(5) If required, remove the nuts (398), the bolts (399) and the bearing fitting (367) from the lower door structure.

[Rev.10 from 2021] 2026.04.02 06:27:43 UTC