Removal of the Pressure-Relief Valve Hose/Tube

TASK 29-11-49-000-006-A
Removal of the Pressure-Relief Valve Hose/Tube

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

WARNING: DO NOT TOUCH THE HYDRAULIC SYSTEM COMPONENTS FOR A SHORT TIME AFTER THE ENGINE IS SHUTDOWN. THE ENGINE COMPONENTS STAY HOT FOR SOME TIME AND CAN CAUSE INJURY.

CAUTION: DO NOT LET HYDRAULIC FLUID FALL ON THE ENGINE. UNWANTED HYDRAULIC FLUID MUST BE REMOVED IMMEDIATELY WITH A CLEAN LINT FREE CLOTH. THE FLUID CAN CAUSE DAMAGE TO THE SURFACE PROTECTION AND TO SOME PARTS.

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 1M (3 FT)-ADJUSTABLE
No specific	AR	CONTAINER 5 L (1.32 USGAL)
No specific	AR	COVER - PROTECTION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL

C. Referenced Information

REFERENCE	DESIGNATION
TASK 29-10-00-864-001-A	Depressurize the Green Hydraulic System
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
Pressure Relief Valve Hose/Tubes
Pressure Relief Valve Hose/Tubes
FOR [1000EM1] (ENGINE-1)
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors

3. Job Set-up
Subtask 29-11-49-860-083-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Depressurize the Green hydraulic system (Ref. AMM TASK 29-10-00-864-001).
(2) Depressurize the Green hydraulic reservoir (Ref. AMM TASK 29-14-00-614-001).
(3) Put WARNING NOTICE(S) in position to tell persons not to pressurize the Green hydraulic system:

on the ground service panel 197CB.

(4) Put WARNING NOTICE(S) on the access door 195BB to tell persons not to pressurize the Green hydraulic reservoir.

Subtask 29-11-49-941-073-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:

put WARNING NOTICE(S) to tell persons not to start the engine.

(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) Put WARNING NOTICE(S) in position to tell persons not to pressurize the Green hydraulic system:

in the cockpit, on the HYD section of the overhead panel 40VU.

(4) On the overhead maintenance panel 50VU:

make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.

(5) Put WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
(6) Put a CONTAINER 5 L (1.32 USGAL) under the pressure relief valve.

Subtask 29-11-49-865-059-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R34

Subtask 29-11-49-010-073-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the left fan cowl door:
(a) FOR [1000EM1] (ENGINE-1)
open the door 437AL (Ref. AMM TASK 71-13-00-010-040).
(2) Put the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position at the engine.

4. Procedure
Subtask 29-11-49-020-065-A ** ON A/C NOT FOR ALL

A. Removal of the Pressure-Relief Valve Hose/Tube
(1) Disconnect the higher pressure relief valve hose/tube (25) from the lower pressure-relief valve tube (30) and let the fluid flow into the container.

NOTE: Use a second wrench to hold the lower pressure-relief valve tube when you loosen the coupling nut on the higher pressure-relief valve tube.

(2) Disconnect the pressure-relief valve hose/tube (25) from the pressure-relief valve interface.
(3) Remove the bolts (5), the washers (10), the nuts (15) and the clamps (20) that attach the pressure-relief valve hose/tube (25) to the engine brackets at flange STA.199(A2).
(4) Remove the pressure-relief valve hose/tube (25) from the engine.
(5) Put COVER - PROTECTION on the pressure-relief valve tube (30), the fitting on the top case drain hose/tube and the pressure-relief valve hose/tube (25).
(6) Disconnect the lower pressure-relief valve tube (30) from the top case drain hose/tube and let the fluid flow into the container.

NOTE: Use a second wrench to hold the fitting on the case drain tube when you loosen the coupling nut on the pressure-relief valve tube.

(7) If not done before, disconnect the lower pressure-relief valve tube (30) from the higher pressure-relief valve hose/tube (25).

NOTE: Use a second wrench to hold the lower pressure-relief valve tube when you loosen the coupling nut on the higher pressure-relief valve tube.

(8) Remove the bolt (5), the washer (10), the nut (15) and the clamp (20) that attach the lower pressure-relief valve tube to the engine bracket at flange STA.199(A2).
(9) Remove the bolt (5), the washer (10), the nut (15) and the clamp (20) that attach the lower pressure-relief valve tube to the engine bracket at flange STA.185(B5).
(10) Remove the lower pressure-relief valve tube (30) from the engine.
(11) Put COVER - PROTECTION on the lower pressure-relief valve tube (30), the fitting on the top case drain hose/tube and the higher pressure-relief valve hose/tube (25).

[Rev.10 from 2021] 2026.04.01 00:17:13 UTC