Installation of the NLG Downlock Release Actuator

TASK 32-31-23-400-001-A
Installation of the NLG Downlock Release Actuator

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

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

WARNING: LET THE BRAKES AND THE WHEELS BECOME COOL BEFORE YOU GO NEAR THE LANDING GEAR. DO NOT APPLY A LIQUID OR GAS DIRECTLY ON A HOT WHEEL OR BRAKE UNIT. THIS CAN CAUSE A TIRE EXPLOSION AND/OR A WHEEL RIM BURST.

WARNING: PRESSURIZE ONLY THE HYDRAULIC SYSTEM(S) THAT IS (ARE) NECESSARY FOR THE TASK. ISOLATE THE OTHER HYDRAULIC SYSTEM(S) BEFORE YOU SUPPLY HYDRAULIC POWER TO THE AIRCRAFT.

WARNING: MAKE SURE THAT THE CONTROLS AGREE WITH THE POSITION OF THE ITEMS THEY OPERATE BEFORE YOU PRESSURIZE A HYDRAULIC SYSTEM. UNWANTED MOVEMENT OF HYDRAULICALLY OPERATED ITEMS CAN CAUSE SERIOUS INJURY AND/OR DAMAGE.

CAUTION: DO NOT LET THE MLG DOOR TOUCH THE BOTTOM WING SURFACE. THIS WILL PREVENT DAMAGE.

ZONE: 123
FIN: 2845GM

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

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	AR	CONTAINER 5 L (1.32 USGAL)
No specific	AR	SAFETY BARRIER(S)
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 2.14 and 1.52 m.daN (15.78 and 11.21 lbf.ft )
No specific	Torque wrench: range to between 3 and 2.5 m.daN (22.12 and 18.44 lbf.ft )
J47587	1	GUIDE CONE

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03GBB1)	Synthetic Oil base Grease-General Purpose Clay Thickened -
(Material No.03GBC1)	Synthetic Oil base Grease-General Purpose Lithium Thickened Low Temp. -
(Material No.06ABA1)	Polysulfide Sealant-Fuel Tank Brushable -
(Material No.06LDG2)	Non Hardening Jointing Putty-High Temp. Area - Structure
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.08BBB1)	Non Aqueous Cleaner-- Petroleum Based -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
123	NOSE GEAR WELL

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
4	COTTER PIN	AIPC 32-21-11-20-010
4	COTTER PIN	AIPC 32-21-11-40-010
4	COTTER PIN	AIPC 32-21-11-60-010
4	COTTER PIN	AIPC 32-21-11-80-010
13	COTTER PIN	AIPC 32-21-17-02-060

E. Referenced Information

REFERENCE	DESIGNATION
TASK 12-12-29-611-001-A	Fill the Hydraulic Fluid Reservoir with a Hand Pump
TASK 12-12-29-611-002-A	Fill the Hydraulic Fluid Reservoir with a Hydraulic Service Cart
TASK 12-22-32-640-002-A	Lubrication of Nose Landing Gear and Doors
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
TASK 32-22-00-010-001-A	Nose Gear Doors - Ground Doors Opening
TASK 32-22-00-410-001-A	Nose Gear Doors - Ground Doors Closing
TASK 32-31-00-720-003-A	Functional Test of the Normal Extension and Retraction of the Nose Landing Gear
NLG Downlock Release Actuator

3. Job Set-up
Subtask 32-31-23-860-051-A

A. Aircraft Maintenance Configuration
(1) Make sure that the Green hydraulic system is depressurized and put it in the maintenance configuration.
(Ref. AMM TASK 29-00-00-864-001)
(2) Make sure that the reservoir of the Green hydraulic system is depressurized (Ref. AMM TASK 29-14-00-614-001).
(3) In the cockpit, on the panel 400VU, make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to operate the landing gear control lever.
(4) Make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to pressurize the Green hydraulic system:

on the panel 40VU in the cockpit,
on the ground service panel of the Green hydraulic system, access door (197CB).

(5) Make sure that the SAFETY BARRIER(S) are in position.
(6) Make sure that the CONTAINER 5 L (1.32 USGAL) is in position below the NLG downlock release actuator (2845GM).
(7) Make sure that the doors of the nose landing gear are open (Ref. AMM TASK 32-22-00-010-001).
(8) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position in zone 123.

4. Procedure
Subtask 32-31-23-110-050-A

A. Preparation for Installation
(1) Clean the shafts (8) and (10) with Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1) .
(2) Lightly lubricate the shafts (8) and (10) with Synthetic Oil base Grease-General Purpose Clay Thickened - (Material No.03GBB1) or Synthetic Oil base Grease-General Purpose Lithium Thickened Low Temp. - (Material No.03GBC1) .
(3) Clean the attachment hardware with Non Aqueous Cleaner-General - - (Material No.08BAA9) and dry with filtered compressed air.
(4) Apply a light coat of Non Hardening Jointing Putty-High Temp. Area - Structure (Material No.06LDG2) to the threads of all the nuts, screws, bolts and pins.

Subtask 32-31-23-420-050-A ** ON A/C NOT FOR ALL

B. Installation of the NLG Downlock Release Actuator
(1) Put the actuator (1) on the shaft (8).

NOTE: Make sure that the washer (7) is in position on the shaft (8).

(2) Install the washer (6) and the nut (5). TORQUE the nut (5) to between 3 and 2.5 m.daN (22.12 and 18.44 lbf.ft )

.
(3) Safety the nut (5) with the new AIPC 32-21-11-40-010 COTTER PIN (4) or AIPC 32-21-11-60-010 COTTER PIN (4) or AIPC 32-21-11-80-010 COTTER PIN (4).
(4) Install the J47587 GUIDE CONE on the shaft (10).
(5) Install the ball end of the actuator (1) on the shaft (10).

NOTE: Make sure that the bush (9) is correctly installed on the shaft (10).

(6) Remove the J47587 GUIDE CONE.
(7) Install the washer (11) and the nut (12). TORQUE the nut (12) to between 3 and 2.5 m.daN (22.12 and 18.44 lbf.ft )

.
(8) Safety the nut (12) with the new AIPC 32-21-17-02-060 COTTER PIN (13).
(9) Lubricate the actuator ball ends (Ref. AMM TASK 12-22-32-640-002).
(10) Apply a light coat of Polysulfide Sealant-Fuel Tank Brushable - (Material No.06ABA1) in zones E.

Subtask 32-31-23-420-050-B ** ON A/C NOT FOR ALL

B. Installation of the NLG Downlock Release Actuator
(1) Put the actuator (1) on the shaft (8).

NOTE: Make sure that the washer (7) is in position on the shaft (8).

(2) Install the washer (6) and the nut (5). TORQUE the nut (5) to between 3 and 2.5 m.daN (22.12 and 18.44 lbf.ft )

.
(3) Safety the nut (5) with the new AIPC 32-21-11-40-010 COTTER PIN (4) or AIPC 32-21-11-20-010 COTTER PIN (4).
(4) Install the J47587 GUIDE CONE on the shaft (10).
(5) Install the ball end of the actuator (1) on the shaft (10).

NOTE: Make sure that the bush (9) is correctly installed on the shaft (10).

(6) Remove the J47587 GUIDE CONE.
(7) Install the washer (11) and the nut (12). TORQUE the nut (12) to between 3 and 2.5 m.daN (22.12 and 18.44 lbf.ft )

Subtask 32-31-23-420-052-A

C. Connection of the Hydraulic and Electrical Lines
(1) Remove the PLUG - BLANKING from the hydraulic lines (2) and (3).
(2) Connect the hydraulic lines (2) and (3) to the frame side only.
(3) TORQUE the hydraulic lines (2) and (3) to between 2.14 and 1.52 m.daN (15.78 and 11.21 lbf.ft )

Subtask 32-31-23-941-053-A

D. Preparation for the Test
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the container below the NLG downlock release actuator (2845GM).
(3) Make sure that the travel ranges of the NLG doors are clear.
(4) Remove the access platform(s).
(5) Close the NLG doors (Ref. AMM TASK 32-22-00-410-001).

Subtask 32-31-23-720-050-A

E. Functional Test
(1) Do the functional test of the NLG normal extension and retraction (Ref. AMM TASK 32-31-00-720-003).
(2) Open the NLG doors (Ref. AMM TASK 32-22-00-010-001).
(3) Put the access platform in position below the NLG downlock release actuator (2845GM).
(4) Make sure that there are no leaks from the disconnected line ends.
(5) If necessary fill the reservoir of the Green hydraulic system to the correct level (Ref. AMM TASK 12-12-29-611-001) or (Ref. AMM TASK 12-12-29-611-002).

5. Close-up
Subtask 32-31-23-410-050-A

A. Close Access
(1) Remove the WARNING NOTICE(S).
(2) Remove the access platform(s).
(3) Make sure that the work area is clean and clear of tools and other items.
(4) Close the doors of the nose landing gear (Ref. AMM TASK 32-22-00-410-001).

[Rev.10 from 2021] 2026.04.01 00:44:55 UTC