Adjustment of the Locking Mechanism of the Bulk Cargo-Compartment Door

TASK 52-33-11-820-002-A
Adjustment of the Locking Mechanism of the Bulk Cargo-Compartment 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: 827

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 3M (10 FT)- ADJUSTABLE
98A52307622000	1	GAGE - MEASURING, BULK CARGO DOOR LOCKING MECHANISM

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.14QFB1)	Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -
No specific	lockwire, corrosion-resistance steel, dia 0.8 mm

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
827	BULK CARGO COMPARTMENT DOOR

D. 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 52-33-13-400-001-A	Installation of the Lining and Insulation of the Bulk Cargo-Compartment Door
TASK 52-33-21-400-001-A	Installation of the Door Locking Mechanism
TASK 52-33-32-400-001-A	Installation of the Door Frame Fittings
TASK 52-71-12-400-003-A	Installation of the Proximity Switch
Clearance Check of the Forward and Aft Barrel Locks
Adjustment of the Forward and Aft Barrel Locks
Adjustment of the Push Rod

3. Job Set-up
Subtask 52-33-11-010-054-A ** ON A/C NOT FOR ALL

A. Get Access
(1) Open the AFT cargo-compartment door (Ref. AMM TASK 52-30-00-860-001) to get access to the inner side of the closed Bulk cargo-compartment door (referred to as Bulk door).
(2) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position for the AFT cargo-compartment door and the Bulk door.
(3) Remove the divider net between the AFT/Bulk cargo compartment at FR59.
(4) Remove the door net from the Bulk door opening.

4. Procedure
Subtask 52-33-11-820-054-B ** ON A/C NOT FOR ALL

A. Adjustment of the Locking Mechanism
(1) Make sure that the notches of the serrated plates and the forward/aft latch spigots are aligned (Ref. AMM TASK 52-33-32-400-001).
(2) Put the 98A52307622000 GAGE - MEASURING, BULK CARGO DOOR LOCKING MECHANISM in the inspection hole of the forward/aft barrel locks to examine the locking mechanism.

NOTE: If you can see the red marking ring of the 98A52307622000 GAGE - MEASURING, BULK CARGO DOOR LOCKING MECHANISM, the adjustment of the locking mechanism is correct.

(3) If you can not see the red marking ring of the measuring gage, adjust the locking mechanism as follows:
(a) Cut and remove the lockwire from the jam nuts (34).
(b) Loosen the jam nuts (34) and release the locking rings (33).
(c) Turn the push rod (32) clockwise or counterclockwise until the adjustment is correct.

NOTE: Make sure that the threads of the eye ends cover the inspection hole of the rod body.

(d) Set the locking rings (33) in the correct position and tighten the jam nuts (34).
(e) Safety the jam nuts (34) with lockwire, corrosion-resistance steel, dia 0.8 mm on the locking ring (33).
(f) Remove the measuring gage from the inspection hole of the forward and aft barrel locks (20).
(4) Make sure that the external door handle is in the center of the recess at the outer skin.
(5) If not, adjust the position of the external door handle as follows:
(a) Cut and remove the lockwire (44) from the jam nut (42).
(b) Loosen the jam nut (42) and turn the adjustment screw (43) until the external door handle is in the center position.
(c) Tighten the jam nut (42) and safety it with the 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(6) Adjust the overturn stop of the locking mechanism as follows:
(a) Move the door handle to the OPEN position to release the Bulk door.
(b) Make sure that the claws of the barrel locks (20) do not engage with the related latch spigots on the fuselage frame.

NOTE: The location of the claws make sure that you can move the Bulk door freely from or into the closed position.

(c) Measure the clearance between the stop screw (38) of the limit stop (36) and the support screw (39) of the support fitting (40).

NOTE: Both screws must have contact.

(d) If not, add the same quantity of washers (37) at the stop screw (38) and at the support screw (39) as follows:
1 Move the door handle to the LOCKED position.
2 Remove the nuts (35) from the limit stop (36).
3 Remove the stop screw (38) from the limit stop (36).
4 Remove the support screw (39) from the support fitting (39).
5 Install the same quantity of washers (37) at the support screw (39) and at the stop screw (38) as necessary.
6 Install the stop screw (38) with the related washers (37) on the limit stop (36).
7 Install the support screw (39) with the related washers (37) on the support fitting (39).
8 Install the nuts (35) on the support screw (39) and on the stop screw (38) and tighten them.
9 Move the door handle to the OPEN position.
(e) Make sure that the stop screw (38) has contact with the support screw (39).
(f) If not, do the above adjustment again until the two screws have contact.

Subtask 52-33-11-820-053-A ** ON A/C NOT FOR ALL

B. Adjustment of the Gaps
(1) Measure the gaps "J" and "K" between the forward latch spigot and the forward barrel lock (20).

NOTE: The gap "J" must be a minimum of 0.1 mm (0.0039 in.). The gap "K" must be between 0.5 mm (0.0197 in.) and 1.0 mm (0.0394 in.).

(2) Measure the gaps "L" and "M" between the aft latch spigot and the aft barrel lock (20).

NOTE: The gap "L" must be a minimum of 0.1 mm (0.0039 in.). The gap "M" must be between zero and 0.5 mm (0.0197 in.).

(3) Adjust the gaps "K" and "M" as follows:
(a) Open the Bulk door to get access to the forward and aft barrel locks (20).
(b) Safety the not fully opened Bulk door with an applicable support device.
(c) Remove the nuts (23), the washer (24) and the bolts (25) from the shaft (22).
(d) Pull the forward and aft barrel locks (20) together with the spacer set (21) away from the shaft (22).
(e) Add or remove one spacer to change the thickness of the spacer set (21) as required.

NOTE: Obey the preparation instructions of the subsequent components (Ref. AMM TASK 52-33-21-400-001).

(f) Install the forward and aft barrel locks (20) together with the spacer set (21) into the shaft (22).
(g) Connect the shaft (22) to the forward and aft barrel locks (20) as follows:
1 Remove the nuts (27), the washers (28) and the bolts (29) to disconnect the flange (26) from the joint assembly (30).
2 Align the holes of the forward and aft barrel locks (20) and the shaft (22).
3 Install the bolt (25) with the washers (24) and the nuts (23).
4 Connect the flange (26) with the joint assembly (30) and install the bolts (29), the washer (28) and the nuts (27).

NOTE: Make sure that the mating surfaces of the flange (26) and the joint assembly (30) have contact and their holes align.

5 If necessary, turn the flange (26) to get contact to the mating surfaces and/or to align the holes.
6 Tighten the nuts (27),(23).
(h) Remove the support device and set the Bulk door in the locked position.
(i) Make sure that the gaps "K" and "M" are correct.
(4) Change the position of the forward and aft latch spigots on the door frame to adjust the gaps "J" and "L" correctly (Ref. AMM TASK 52-33-32-400-001).

Subtask 52-33-11-860-054-A ** ON A/C NOT FOR ALL

C. Preparation for the Test
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Set the Bulk door in the correct closed position.
(3) Make sure that the proximity switch 50WV is correctly adjusted (Ref. AMM TASK 52-71-12-400-003).

Subtask 52-33-11-720-050-B ** ON A/C NOT FOR ALL

D. Do this functional test to examine the locking mechanism.

ACTION	RESULT
1.Set the external door handle in the LOCKED position.	The forward and aft barrel locks engage smoothly with the related latch spigots.
2.Push the external door handle into its recess.	The external door handle is in line with the Bulk door contour and correctly locked in the recess.
3.Push the button of the external door handle.	The external door handle is released from the recess.
4.Turn the external door handle in the OPEN position and measure the force which is necessary.	The forward and aft barrel locks disengage from the related latch spigots. The force must be less than 18 daN (40.4656 lbf).
5.Push the Bulk door manually in the open direction.	The barrel locks come smoothly free from the latch spigots.
6.Set the external door handle to the LOCKED position.	The locking mechanism is in the LOCKED condition.
7.Move the Bulk door to the fully open position.	The hook engages with the hook arrester of the crossbeam.
8.Set the external door handle to the OPEN position.	The hook disengages from the hook arrester of the crossbeam.
9.Move the Bulk door down into the door opening.	The barrel locks move smoothly over the related latch spigots.
10.Set the door handle into the LOCKED position.	The barrel locks engage correctly with the related latch spigot.
11.Make sure that the external door handle is in its recess.	The Bulk door is correctly closed and locked.

5. Close-up
Subtask 52-33-11-410-057-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Install the insulation packs in the work area and the lining on the Bulk door (Ref. AMM TASK 52-33-13-400-001).
(2) Install the door net into the opening of the Bulk door.
(3) Install the divider net between the Bulk/ AFT cargo compartment at FR59.
(4) Close the AFT cargo-compartment door (Ref. AMM TASK 52-30-00-860-002).
(5) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.02 06:28:05 UTC