Removal of the Differential Pressure Indicator

TASK 29-14-41-000-803-A
Removal of the Differential Pressure Indicator

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. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
191DB, 195BB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
Differential Pressure Indicator

3. Job Set-up
Subtask 29-14-41-860-068-A

A. Aircraft Maintenance Configuration
(1) Make sure that the hydraulic systems are depressurized and put in the maintenance configuration (Ref. AMM TASK 29-00-00-864-001).
(2) Depressurize the reservoirs of the Green, Yellow and Blue hydraulic systems.
(Ref. AMM TASK 29-14-00-614-001).

Subtask 29-14-41-941-053-A

B. Safety Precautions
(1) Put the WARNING NOTICE(S) in position to tell person not to pressurize Green, Blue and Yellow hydraulic systems:

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

(2) Put the WARNING NOTICE(S) in position to tell person not to pressurize the BLEED system:

In the cockpit on the AIR COND overhead panel 30VU
On the access door 191DB.

Subtask 29-14-41-865-067-A

C. 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
49VU	HYDRAULIC/G HYD/PUMP ENG1/CTL	1701GK	H12
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/G HYD/PUMP ENG1/CTL	1701GK	R35
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N30
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R34
** ON A/C ALL
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N31
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R33
** 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 29-14-41-010-057-A

D. Get Access
(1) Open the access panel 195BB.

4. Procedure
Subtask 29-14-41-020-057-A

A. Removal of the Differential Pressure Indicator

Differential Pressure Indicator

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.

(1) Remove and discard the lockwire from the screws (3).
(2) Remove the screws (3).
(3) Remove the differential pressure indicator (2) and the packings (4) and (5).
(4) Discard the packings (4) and (5).

[Rev.10 from 2021] 2026.04.01 00:24:53 UTC