Check Reservoir Air Pressure on Reservoir Gauge

TASK 29-10-00-200-002-A
Check Reservoir Air Pressure on Reservoir Gauge

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.

NOTE: Do this check directly after shut-down of the bleed-air pressurization system (engines and APU).

NOTE: Is not permitted to operate the hydraulic systems during this check.

ZONE: 100
ZONE: 196
ZONE: 197
ZONE: 744
FIN: 1383GM
FIN: 2383GM
FIN: 3383GM

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	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.14CCB6)	Testing Medium-Leak Detection - Oxygen System

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
100	LOWER HALF FUSELAGE INCLUDING RADOME
196	HYDRAULIC COMPT AND FAIRINGS
197	REAR FAIRING
744	MAIN DOOR
196BB, 197FB

D. Referenced Information

REFERENCE	DESIGNATION
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 29-14-00-614-002-A	Pressurization of the Hydraulic Reservoirs through the Ground Connector
TASK 29-14-00-614-002-A-01	Pressurization of the Hydraulic Reservoirs with the Auxiliary Power Unit (APU)
TASK 32-12-00-010-001-A	Open the Main Gear Doors for Access
TASK 32-12-00-410-001-A	Close the Main Gear Doors after Access
Location of the Air Pressure Gauge and Fill Level Gauge on the Hydraulic Reservoirs

3. Job Set-up
Subtask 29-10-00-860-063-A

A. Aircraft Maintenance Configuration
(1) Depressurize the Green, Yellow and Blue hydraulic systems, but not the reservoirs (Ref. AMM TASK 29-00-00-864-001).
(2) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the hydraulic systems:

In the flight compartment on hydraulic section 40VU of the overhead panel
On the ground service panels of the Green, Yellow and Blue hydraulic systems.

Subtask 29-10-00-865-056-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	HYD/HYD PWR/B WARN/& CTL	2702GJ	C12
** 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
123VU	B HYD/ELEC PUMP	2701GJ	AB09
123VU	Y HYD/ELEC/PUMP	3802GX	AB06
123VU	Y HYD/ELEC/ELEC PUMP/NORM	3801GX	AB03

Subtask 29-10-00-010-055-A

C. Get Access
(1) Open one door of the main landing gear (Ref. AMM TASK 32-12-00-010-001).

NOTE: You can open any door, but the access is better from the right side.

(2) Open access doors 196BB 197FB.

4. Procedure
Subtask 29-10-00-210-052-A

A. Do a Check of the Air Pressure in the Hydraulic Reservoirs

Location of the Air Pressure Gauge and Fill Level Gauge on the Hydraulic Reservoirs

(1) After shut-down of the bleed-air pressurization system:
(a) Read and note the reservoir fill levels from the reservoir fill gauges (1), (2) and (3).
(2) Three hours after shut-down of the bleed-air pressurization system:
(a) Read the pressure gages (4), (5) and (6) (1383GM, 2383GM, 3383GM). Make sure that the pressure values are not less than 35 psi (2.4132 bar).
(b) Read the reservoir fill levels from the reservoir fill gauges (1), (2) and (3). Make sure that the reservoir fill level has not decreased by more than 0.6 l (0.1585 USgal).
(3) If the pressure or the fill level in a reservoir is not in the given limit, continue as follows:
(a) Use the oxygen leak detector, Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) , and do a leak check.
(b) Do the applicable correction procedures for the leaks that you find.
(c) Pressurize the reservoirs (Ref. AMM TASK 29-14-00-614-002).

5. Close-up
Subtask 29-10-00-410-055-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the door of the main landing gear (Ref. AMM TASK 32-12-00-410-001).
(3) Close access doors 196BB 197FB.
(4) Remove the WARNING NOTICE(S).

Subtask 29-10-00-865-057-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 ALL
49VU	HYD/HYD PWR/B WARN/& CTL	2702GJ	C12
** 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
123VU	B HYD/ELEC PUMP	2701GJ	AB09
123VU	Y HYD/ELEC/PUMP	3802GX	AB06
123VU	Y HYD/ELEC/ELEC PUMP/NORM	3801GX	AB03

[Rev.10 from 2021] 2026.04.01 08:09:13 UTC