Installation of the Non Return Valve (NRV) [CFML]

TASK 79-21-50-400-802-A
Installation of the Non Return Valve (NRV)

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

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	CONTAINER 5 L (1.32 USGAL)
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 46.47 and 42.04 lbf.in (0.53 and 0.48 m.daN )
No specific	Torque wrench: range to between 92.93 and 84.08 lbf.in (1.05 and 0.95 m.daN )
No specific	Torque wrench: range to between 120.81 and 109.30 lbf.in (1.37 and 1.24 m.daN )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
10	GASKET	EIPC 79-21-50-01-070
13	GASKET	EIPC 79-21-50-01-090
12	GASKET	EIPC 79-21-50-01-110

D. Referenced Information

REFERENCE	DESIGNATION
TASK 12-13-79-610-805-A	Check of the Oil Level and Replenishing
TASK 71-00-00-710-815-A	Idle Leak Check
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
Non Return Valve (NRV)

3. Job Set-up
Subtask 79-21-50-941-052-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Make sure that the WARNING NOTICE(S) are in position to tell persons not to operate:

The ENG/MODE selector switch, and
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Make sure that the WARNING NOTICE(S) is in position to tell persons not to energize FADEC 1(2).

Subtask 79-21-50-010-053-A

B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR

4. Procedure

WARNING: USE PERSONAL PROTECTION EQUIPMENT. USE THE ENGINE OIL IN A WELL-VENTILATED AREA. ENGINE OIL IS TOXIC.

WARNING: USE PROTECTIVE GLOVES AND BE CAREFUL WITH OIL SPLASHES WHEN YOU DISCONNECT OIL TUBES. HOT OIL CAN CAUSE DEEP BURNS.

Subtask 79-21-50-420-051-A

A. Installation of the Non Return Valve (NRV)
(1) Put a CONTAINER 5 L (1.32 USGAL) below the NRV (1).
(2) Remove all the COVER - PROTECTION and CAP - PROTECTION from the openings, tubes, hoses and connectors.
(3) Make sure that the mating surfaces are clean and clear of unwanted materials.
(4) Install the new EIPC 79-21-50-01-090 GASKET (13) on the oil tube (11).
(5) Install the NRV (1) in the correct position on the oil tube (11).
(6) Install the new EIPC 79-21-50-01-110 GASKET (12) and oil tube (8) in correct position on the NRV (1).
(7) Install the four bolts (6) and the four nuts (5) to attach the oil tube (8) and oil tube (11) and tighten them with your hand.
(8) TORQUE the four nuts (5) to between 92.93 and 84.08 lbf.in (1.05 and 0.95 m.daN )

.
(9) Install the new EIPC 79-21-50-01-070 GASKET (10) and the oil tube (8) in the correct position on the lubrication unit (7).
(10) Install the four bolts (9) to attach the oil tube (8) to the lubrication unit (7) and tighten them with your hand.
(11) TORQUE the four bolts (9) to between 120.81 and 109.30 lbf.in (1.37 and 1.24 m.daN )

.
(12) Install the bolt (2) to attach the clamp (3) to the bracket (4) and tighten them with your hand.
(13) TORQUE the bolt (2) to between 46.47 and 42.04 lbf.in (0.53 and 0.48 m.daN )

.
(14) Remove the CONTAINER 5 L (1.32 USGAL) from below the NRV (1).

Subtask 79-21-50-612-050-A

B. Replenishing of the Oil Tank
(1) Do the replenishing of the oil tank (Ref. AMM TASK 12-13-79-610-805).

Subtask 79-21-50-710-050-A

C. Test
(1) Do the idle leak check (Ref. AMM TASK 71-00-00-710-815).

5. Close-up
Subtask 79-21-50-410-051-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:43:20 UTC