Visual Inspection of the Fuel Return Valve (FRV) [CFML]

TASK 73-11-35-210-801-A
Visual Inspection of the Fuel Return Valve (FRV)

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	ACCESS PLATFORM 1M(3 FT)
No specific	AR	WARNING NOTICE(S)

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. Referenced Information

REFERENCE	DESIGNATION
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
TASK 73-11-35-000-801-A	Removal of the Fuel Return Valve (FRV)
TASK 73-11-35-400-801-A	Installation of the Fuel Return Valve (FRV)
Fuel Return Valve (FRV)

3. Job Set-up
Subtask 73-11-35-941-052-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) Put WARNING NOTICE(S) in position to tell persons not to operate:

The ENG/MODE selector switch
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) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 73-11-35-010-052-A

B. Get Access
(1) Open the fan cowl doors (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
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.

4. Procedure
Subtask 73-11-35-210-050-A

A. Visual Inspection of the Fuel Return Valve (FRV)

Table 1: Visual inspection of the FRV

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Hydraulic fittings (blue surfaces):
Nicks/Dents/Burrs Scratches/Cracks/ Pitting/Wear/ Scoring/Corrosion Erosion/ Deposits	Not serviceable on metal to metal sealing surfaces after cleaning per procedure	Replace the FRV. Refer to (Ref. AMM TASK 73-11-35-000-801) and (Ref. AMM TASK 73-11-35-400-801).
Circular marks	Serviceable with light marks and without depth, burrs or sharp surfaces	Replace the FRV. Refer to (Ref. AMM TASK 73-11-35-000-801) and (Ref. AMM TASK 73-11-35-400-801).
2.Housing radius (red surfaces):
Cracks/Pitting/ Corrosion/Erosion	Not serviceable	Replace the FRV. Refer to (Ref. AMM TASK 73-11-35-000-801) and (Ref. AMM TASK 73-11-35-400-801).
Nicks/Scratches/ Dents	Not serviceable	Replace the FRV. Refer to task (Ref. AMM TASK 73-11-35-000-801) and (Ref. AMM TASK 73-11-35-400-801).
Deposits	Minor discoloration allowed after cleaning per procedures	Replace the FRV. Refer to (Ref. AMM TASK 73-11-35-000-801) and (Ref. AMM TASK 73-11-35-400-801).
3.FRV housing, covers, plugs (light blue surfaces):
Cracks	Not serviceable	Replace the FRV. Refer to (Ref. AMM TASK 73-11-35-000-801) and (Ref. AMM TASK 73-11-35-400-801).
Pitting/Wear/ Erosion/Corrosion	Not serviceable	Replace the FRV. Refer to task (Ref. AMM TASK 73-11-35-000-801) and (Ref. AMM TASK 73-11-35-400-801).
Nicks/Scratches/ Dents	Not serviceable	Replace the FRV. Refer to (Ref. AMM TASK 73-11-35-000-801) and (Ref. AMM TASK 73-11-35-400-801).
Deposits	Minor discoloration allowed after allowed cleaning	Replace the FRV. Refer to (Ref. AMM TASK 73-11-35-000-801) and (Ref. AMM TASK 73-11-35-400-801).

5. Close-up
Subtask 73-11-35-410-051-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 access platform(s).
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:04:14 UTC