Installation of the Balance Mechanism

TASK 52-22-21-400-005-A
Installation of the Balance Mechanism

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

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
98D52207557000	1	BALLAST WEIGHT - EMERGENCY EXIT

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03HBD9)	Synthetic Ester base Grease-General Purpose Low Temp -
No specific	lockwire, corrosion resistance steel, dia. 0.8 mm (0.030 in.)

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
382	COTTER PIN	AIPC 52-22-21-20-060
397	LOCK WASHER	AIPC 52-22-21-21-090
363	COTTER PIN	AIPC 52-22-21-22-160

D. 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 25-23-47-400-012-A	Installation of the Door Linings of the LH FWD Emergency Exit Door, zone 231
TASK 25-23-47-400-013-A	Installation 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 25-23-47-400-802-A	Installation 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 52-22-00-410-001-A	Closing 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
TASK 52-22-00-860-004-A	Special Precaution after Maintenance on the Door Damper and Emergency Operation Cylinder
Balance Mechanism

3. Job Set-up
Subtask 52-22-21-865-060-A ** ON A/C NOT FOR ALL

A. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

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 52-22-21-860-054-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Make sure that the emergency exit door (referred to as door) is opened as required (Ref. AMM TASK 52-22-00-010-001).
(2) Make sure that the special precaution of the door damper and emergency operation cylinder is completed (Ref. AMM TASK 52-22-00-860-003).
(3) Make sure that the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE is in position below the partly opened door (Ref. AMM TASK 52-22-00-010-001).
(4) Make sure that the door lining is removed (Ref. AMM TASK 25-23-47-000-012) or (Ref. AMM TASK 25-23-47-000-013).

Subtask 52-22-21-860-054-B ** ON A/C NOT FOR ALL

4. Procedure
Subtask 52-22-21-910-053-A ** ON A/C NOT FOR ALL

A. Preparation for Installation
(1) Make sure that the parts retained from the removed component are clean and in the correct condition.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Make sure that all bushes are in the correct condition.
(4) Apply Synthetic Ester base Grease-General Purpose Low Temp - (Material No.03HBD9) to all surfaces of parts which move.

Subtask 52-22-21-420-062-D ** ON A/C NOT FOR ALL

B. Installation of the Torsion Bar Assembly

Balance Mechanism ** ON A/C NOT FOR ALL

(1) Install the pretension sleeve (371) as follows:
(a) Put the stop (390) in position to the door structure and safety it with the retaining ring (391).
(b) If required, put the pretension lever (356) in the correct position to the splined area of the pretension sleeve (371).

NOTE: Make sure that the punch mark of the pretension lever (356) is two splines from the notch of the pretension sleeve (371) in the counterclockwise direction.

(c) Attach the pretension lever (356) with the bolt (357) and the nut (355) to the pretension sleeve (371).
(d) Put the pretension sleeve (371) together with the pretension lever (356) in position to the door structure.
(e) Install the washers (368), (369) and (370) to the pretension sleeve (371).

NOTE: Obey the sequence and the quantity of the washers (368), (369) and (370) as written down before.

(f) Move the pretension sleeve ((371) in the rear direction until it engages with the door structure.
(g) Put the flange bearing (352) in position to the door member and make sure that it engages with the pretension sleeve (371).
(h) Attach the flange bearing (352) with the bolts (353) and the nuts (351) to the door structure.
(2) Install the torsion tube (372) as follows:
(a) If removed, put the flange bearing (389) in position to the door structure and attach it with the bolts (394) and the nuts (395).
(b) Put the torsion lever (381) in position and move the torsion tube (372) forward until the torsion lever (381) is on its splined position.

NOTE: Make sure that the punch mark on torsion lever (381) aligns with the notch of the torsion tube (372).

(c) Make sure that the torsion lever (381) is in the correct position and install the screw (396) and the new AIPC 52-22-21-21-090 LOCK WASHER (397).
(d) Tighten the screw (396) and safety it with the lock washer (397).
(e) Move the torsion tube (372) in position to the door structure until it engages with the structural bearing of the door frame.
(3) Connect the connection link (386) with the torsion lever (381) as follows:
(a) If removed, install the bush (387) to the fork-end of the torsion lever (381).
(b) Put the lower eye-end of the connection link (386) in position to the fork-end of the torsion lever (381).
(c) Install the bolt (388), the bush (385), the washers (384) and the nut (383).
(d) Tighten the nut (383) and safety it with the new AIPC 52-22-21-20-060 COTTER PIN (382).
(4) Move the torsion spring (373) into the flange bearing (379) or (352) and make sure that it engages with the torsion sleeve (372) and the pretension sleeve (371).
(5) Make sure that the notches of the torsion spring (373), the torsion tube (372) and the pretension sleeve (371) align.
(6) Install the retaining rings (377) and (354) into the flange bearings (379) and (352).
(7) Put the bushings halves (392) in the position on the torsion spring (373) and attach it with clamp (393).

Subtask 52-22-21-420-056-A ** ON A/C NOT FOR ALL

C. Installation of the Pretension Unit

Balance Mechanism ** ON A/C NOT FOR ALL

(1) If removed, put the bearing fitting (367) in position and attach it with the bolts (399) and the nuts (398) to the door structure.
(2) If removed, install the spherical bearing (366) into the bearing fitting (367).
(3) Connect the pretension rod (364) with the pretension lever (356) as follows:
(a) If removed, install the bush (358) to the fork-end of the pretorsion lever (356).
(b) Put the eye-end of the pretension rod (364) in position to the fork-end of the pretension lever (356).
(c) Install the bolt (360), the bush (359), the washers (361) and the nut (362).
(d) Tighten the nut (362) and safety it with the new AIPC 52-22-21-22-160 COTTER PIN (363).
(4) Put the pretension rod (364) in position to the bearing fitting (367) and install the adjustment screw (365).
(5) Tighten the adjustment screw (365) until the gap "X" between the adjustment rod (364) and the bearing fitting (367) is maximum 5.0 mm (0.1969 in.).

Subtask 52-22-21-820-051-A ** ON A/C NOT FOR ALL

D. Adjustment of the Pretension Unit
(1) Install a 98D52207557000 BALLAST WEIGHT - EMERGENCY EXIT to compare the weight of the door lining.
(2) Close the door and measure the force which is necessary to operate the the inboard handle.

NOTE: The force must be less than 15.0 daN (33.7213 lbf).

(3) Operate the inboard handle and measure the force which is necessary to open the door.

NOTE: The force must be less than 15.0 kg (33.0693 lb). The difference between the "open" and "close" force must be smaller than 5.0 daN (11.2404 lbf).

(4) If the force is more than permitted, turn the adjustment screw (365) clockwise to increase the tension of the torsion spring (373).
(5) Do the subsequent check of the balance mechanism:
(a) Make sure that the door is partly opened.
(b) Move the roller lever outbord to release the door detent assembly.
(c) Make sure that the opened door remains in its fully lifted position.
(d) If the door moves down, turn the adjustment screw (365) until the door remains in the position.
(6) If the tension of the torsion spring (373) is correct, safety the adjustment screw (365) with lockwire, corrosion resistance steel, dia. 0.8 mm (0.030 in.).

5. Close-up
Subtask 52-22-21-865-061-A ** ON A/C NOT FOR ALL

A. Make sure that this(these) circuit breaker(s) is(are) closed:

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 52-22-21-410-058-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) Install the insulation mats in the door structure.
(3) Install the door lining (Ref. AMM TASK 25-23-47-400-012) or (Ref. AMM TASK 25-23-47-400-013).
(4) Do the special precaution for the door damper and emergency operation cylinder (Ref. AMM TASK 52-22-00-860-004).
(5) Close applicable the door (Ref. AMM TASK 52-22-00-410-001).
(6) Remove the access platform(s).

Subtask 52-22-21-410-058-B ** 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) Install the insulation mats in the door structure.
(3) Install the door lining (Ref. AMM TASK 25-23-47-400-802).
(4) Do the special precaution for the door damper and emergency operation cylinder (Ref. AMM TASK 52-22-00-860-004).
(5) Close the applicable door (Ref. AMM TASK 52-22-00-410-001).
(6) Remove the access platform(s).

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