Adjustment of the Vent Door

TASK 52-31-11-820-003-A
Adjustment of the Vent Door

CAUTION: IMMEDIATELY AFTER YOU OPEN THE CARGO COMPARTMENT DOOR, RECORD ON THE WORK CARD ON THE DOOR, THE DATE AND TIME WHEN YOU OPENED IT. IF THE CARGO COMPARTMENT DOOR STAYS OPEN FOR 12 HOURS OR MORE, YOU MUST BLEED THE HYDRAULIC SYSTEM RELATED TO IT. IF YOU DO NOT OBEY THESE PRECAUTIONS, THE DOOR CAN CLOSE SUDDENLY WHEN YOU SET THE DOOR TO "CLOSE". THIS CAN CAUSE DAMAGE TO THE DOOR AND TO THE AIRCRAFT STRUCTURE.

ZONE: 825

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. Consumable Materials

REFERENCE	DESIGNATION
(Material No.14QFB1)	Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
825	FORWARD CARGO COMPARTMENT DOOR
825AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
7	TAB WASHER	AIPC 52-31-22-12-280
187	WASHER	AIPC 52-32-22-02-240

E. Referenced Information

REFERENCE	DESIGNATION
TASK 52-30-00-860-001-A	Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 52-30-00-860-002-A	Close the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 52-31-13-000-001-A	Removal of the Lining and the Insulation
TASK 52-31-13-400-001-A	Installation of the Lining and the Insulation
TASK 52-31-22-400-001-A	Installation of the Vent Door
Adjustment of the Vent Door ** ON A/C NOT FOR ALL
Adjustment of the Vent Door ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 52-31-11-010-061-A

A. Get Access
(1) Open the applicable cargo door and install the actuator safety locks to get access to the internal vent door (Ref. AMM TASK 52-30-00-860-001).
(2) Put the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position at the cargo door.

Subtask 52-31-11-865-056-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N30
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N31
** ON A/C ALL
122VU	DOORS/CARGO	1MJ	T12
123VU	Y HYD/ELEC/PUMP	3802GX	AB06
123VU	Y HYD/ELEC/ELEC PUMP/NORM	3801GX	AB03

Subtask 52-31-11-010-062-A

C. Get Access
(1) Remove the access panel(s) 825AR to get access to the interlock mechanism.
(2) Remove the lining and insulation to get access to the inner side of the cargo door structure (Ref. AMM TASK 52-31-13-000-001).
(3) Remove the screws and the washers and disconnect the cover assy from the brackets of the cargo door structure.

4. Procedure
Subtask 52-31-11-820-057-C ** ON A/C NOT FOR ALL

A. Adjustment of the Skin Offset

Adjustment of the Vent Door ** ON A/C NOT FOR ALL

(1) Remove the vent door stop from the open vent door as follows:
(a) Release the tabwashers (187) from the jam nuts (186).
(b) Loosen the jam nuts (186) to release the adjustment bolts (185).
(c) Remove the adjustment bolts (185) with the jam nuts (186) and the tabwashers (187) from the hinge arms (188).
(d) Remove and discard the tabwashers (187).
(2) Close the vent door as follows:
(a) Push the roller lever of the interlock mechanism outboard to release the blockage of the locking shaft.
(b) Move the door handle down to the LOCKED position and push it in the recess of the door structure.
(3) Measure skin offset A between the external contour of the vent door and the forward cargo door.
(4) Make sure that skin offset A (which must be out of wind) is between 0.5 mm (0.0197 in.) and 1.5 mm (0.0591 in.).
(5) If skin offset A is not correct, adjust the length of the connection rod (181) as follows:

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

(a) Cut and remove the lockwire from the locking devices (182).
(b) Loosen the jam nuts (183) to release the turnbuckle (184).
(c) Turn the turnbuckle (184) until skin offset A is correctly adjusted.
(d) Tighten the jam nuts (183).
(e) Safety the jam nuts (183) with the 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy - to the locking devices (182).
(6) Adjust clearance B between the adjustment bolts (185) and the stop bolts (189) as follows:
(a) Pull the locking handle out of the recess and turn it down to the UNLOCKED position to open the vent door.
(b) Install the adjustment bolts (185) together with the jam nuts (186) and the new AIPC 52-32-22-02-240 WASHER (187) in the hinge arms (188).
(c) Make sure that the tabwashers (187) are correctly attached to the hinge arms (188).
(d) Close the vent door again (refer to Para. A.2).
(e) Turn the adjustment bolts (185) until clearance B is between 0.2 mm (0.0079 in.) and 0.6 mm (0.0236 in.).
(f) Tighten the jam nuts (186) correctly.
(g) Safety the jam nuts (186) with the tabwashers (187).
(7) Push the door handle up until it is in the UNLOCKED position.

Subtask 52-31-11-820-057-D ** ON A/C NOT FOR ALL

A. Adjustment of the Skin Offset

Adjustment of the Vent Door ** ON A/C NOT FOR ALL

(1) Remove the vent door stop from the open vent door as follows:
(a) Release the tab washers (7) from the jam nuts (6).
(b) Loosen the jam nuts (6) to release the adjustment bolts (5).
(c) Remove the adjustment bolts (5) with the jam nuts (6) and the tab washers (7) from the hinge arms (1).
(d) Remove and discard the tab washers (7).
(2) Close the vent door as follows:
(a) Push the roller lever of the interlock mechanism outboard to release the blockage of the locking shaft.
(b) Move the door handle down to the LOCKED position and push it in the recess of the door structure.
(3) Measure skin offset A between the external contour of the vent door and the forward cargo door.
(4) Make sure that skin offset A (which must be out of wind) is between 0.5 mm (0.0197 in.) and 1.5 mm (0.0591 in.).
(5) If skin offset A is not correct, adjust the length of the connection rod (2) as follows:

(a) Cut and remove the lockwire from the locking devices (3).
(b) Loosen the jam nuts (4) to release the turnbuckle (2).
(c) Turn the turnbuckle (2) until skin offset A is correctly adjusted.
(d) Tighten the jam nuts (4).
(e) Safety the jam nuts (4) with the 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy - to the locking devices (3).
(6) Adjust clearance B between the adjustment bolts (5) and the stop bolts (8) as follows:
(a) Pull the locking handle out of the recess and turn it down to the UNLOCKED position to open the vent door.
(b) Install the adjustment bolts (5) together with the jam nuts (6) and the new AIPC 52-31-22-12-280 TAB WASHER (7) in the hinge arms (1).
(c) Make sure that the tab washers (7) are correctly attached to the hinge arms (1).
(d) Close the vent door again (refer to Para. A.2).
(e) Turn the adjustment bolts (5) until clearance B is between 0.2 mm (0.0079 in.) and 0.6 mm (0.0236 in.).
(f) Tighten the jam nuts (6) correctly.
(g) Safety the jam nuts (6) with the tab washers (7).
(7) Push the door handle up until it is in the UNLOCKED position.

5. Close-up
Subtask 52-31-11-410-059-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Put the cover assy to the brackets of the cargo door structure and attach it with the related screws and washers (Ref. AMM TASK 52-31-22-400-001).
(3) Install the lining and insulation (Ref. AMM TASK 52-31-13-400-001).
(4) Install the access panel 825AR.

Subtask 52-31-11-865-057-A

B. 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
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N30
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N31
** ON A/C ALL
122VU	DOORS/CARGO	1MJ	T12
123VU	Y HYD/ELEC/PUMP	3802GX	AB06
123VU	Y HYD/ELEC/ELEC PUMP/NORM	3801GX	AB03

Subtask 52-31-11-410-060-A

C. Close Access
(1) Remove the actuator safety locks and close the FWD and/or AFT cargo door(s) (Ref. AMM TASK 52-30-00-860-002).
(2) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.02 07:23:06 UTC