VORV Stuck Mechanically Stuck in Low Flow Position - Track Check

TASK 79-21-00-810-827-A
VORV Stuck Mechanically Stuck in Low Flow Position - Track Check

1. Possible Causes

VARIABLE OIL FLOW REDUCTION VALVE [4069KS]
W04 HARNESS [4088KS]
W03 HARNESS [4087KS]
[4000KS]

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	MULTIMETER - STANDARD
No specific	1	PLIERS - JAWED, SOFT

B. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 71-00-00-810-834-A	General Troubleshooting Guidelines for Additional Troubleshooting Information
TSM TASK 71-00-00-810-835-A	Component and Harness Intermittent Troubleshooting Procedure for Guidance Troubleshooting Intermittent Faults
AMM 70-70-00-910-803	SPOP 6 - Cleaning of the Contact Points and Wiring Harnesses
AMM 73-21-00-710-807	Test No.6 - EEC Operation Test (Idle Test)
AMM 73-21-01-000-801	Removal of the Electronic Engine Control (EEC)
AMM 73-21-01-400-801	Installation of the Electronic Engine Control (EEC)
AMM 73-21-63-000-802	Removal of the Electronic Engine Control (EEC) Wiring Harness (W03)
AMM 73-21-63-400-802	Installation of the Electronic Engine Control (EEC) Wiring Harness (W03)
AMM 73-21-64-000-802	Removal of the Electronic Engine Control (EEC) Wiring Harness (W04)
AMM 73-21-64-400-802	Installation of the Electronic Engine Control (EEC) Wiring Harness (W04)
AMM 78-36-00-010-802	Opening of the Thrust Reverser Cowl-Doors
AMM 78-36-00-410-802	Closing of the Thrust Reverser Cowl-Doors
AMM 79-00-00-281-802	Inspection of the Magnetic Chip Collectors for Oil Contamination
AMM 79-21-15-000-801	Removal of the Variable Oil Reduction Valve (VORV)
AMM 79-21-15-400-801	Installation of the Variable Oil Reduction Valve (VORV)
EEC Wiring Harnesses
W03/W04 Interconnect Wiring Harness
VORV Wiring Harness
VORV Wiring Schematic

3. Fault Confirmation
Subtask 79-21-00-710-074-A ** ON A/C NOT FOR ALL

A. Do an engine start to Idle to confirm this fault. Refer to FADEC system Idle test No. 6 AMM 73-21-00-710-807.

NOTE: The Electronic Engine Control (EEC) channel A and channel B have detected that the Variable Oil Reduction Valve (VORV) has failed in a position that only allows low oil flow to the Fan Drive Gear, No. 1, No. 1.5, and No. 2 bearing compartments. The VORV is controlled by the EEC to regulate oil flow based on engine operating condition changes. The VORV is mounted aft of the compressor intermediate case firewall located at the 9 o'clock position.

Refer to the general troubleshooting guidelines for additional troubleshooting information (Ref. TSM TASK 71-00-00-810-834).
Refer to the component and harness intermittent troubleshooting procedure for guidance troubleshooting intermittent faults (Ref. TSM TASK 71-00-00-810-835).

4. Fault Isolation

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE AND ENGINE OIL CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS WARNING, INJURY CAN OCCUR.

WARNING: REFER TO THE MSDS FOR ALL MATERIAL USED AND THE MANUFACTURER'S SAFETY INSTRUCTIONS FOR ALL EQUIPMENT USED. IF YOU DO NOT OBEY THIS WARNING, INJURY CAN OCCUR.

CAUTION: MAKE SURE YOU REMOVE ELECTRICAL POWER FROM THE EEC BEFORE YOU REMOVE THE ELECTRICAL CONNECTORS. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE EEC CAN OCCUR.

Subtask 79-21-00-810-078-A ** ON A/C NOT FOR ALL

A. If there is confirmation of the fault:
(1) Open the thrust reverser cowl-doors AMM 78-36-00-010-802.
(2) Do an inspection of the magnetic chip colllectors. Refer to oil analysis AMM 79-00-00-281-802.
(a) If the magnetic chip collector inspection is not in limits, remove the engine from service.
(b) If the magnetic chip collector inspection is in limits, continue the troubleshooting procedure.
(3) If the fault continues:
(a) Replace VARIABLE OIL FLOW REDUCTION VALVE [4069KS] AMM 79-21-15-000-801 and AMM 79-21-15-400-801.
(b) Do the test given in Para. 3.
(4) If the fault continues:
(a) Examine the W03 (4087KS) and W04 (4088KS) harnesses and connectors P3 (4000KS-P3) - EEC (4000KS) and P4 (4000KS-P4) - EEC (4000KS), interconnect J107 (4101VC)/P107 (4101VC-A) and connector P54 (4069KS-P54) - VORV (4069KS), for problems which are possible between the EEC (4000KS) and the VORV (4069KS).
(b) Inspect for harnesses damage.
(c) Inspect for loose or damaged connectors.

NOTE: Loose connectors must be disconnected and examined for further wear or damage.

(d) If a problem is found with the harnesses or connectors:
1 Replace W04 HARNESS [4088KS] AMM 73-21-64-000-802 and AMM 73-21-64-400-802, or
2 Replace W03 HARNESS [4087KS] AMM 73-21-63-000-802 and AMM 73-21-63-400-802.
3 Do the test given in Para. 3.
(5) If no problems are found with the harnesses or the fault continues, use a PLIERS - JAWED, SOFT to disconnect electrical connectors P3 (4000KS-P3) and P4 (4000KS-P4) from the EEC (4000KS), interconnect J107 (4101VC)/P107 (4101VC-A) and connector P54 (4069KS-P54) from the VORV (4069KS).
(a) Examine the pins and sockets (contacts) for alignment and damage. Look for contacts pushed rearward into the connector face. Replace parts as necessary.
(b) Clean the contacts with contact cleaner and clean cloth per SPOP 6. Blow dry with air (at less than 30 psi) across the connector face AMM 70-70-00-910-803.
(c) Reconnect electrical connectors P3 (4000KS-P3) and P4 (4000KS-P4) to the EEC (4000KS), interconnect J107 (4101VC)/P107 (4101VC-A) and connector P54 (4069KS-P54) to the VORV (4069KS).
(d) Do the test given in Para. 3.
(6) If the fault continues:
(a) Disconnect electrical connectors P3 (4000KS-P3) and P4 (4000KS-P4) from the EEC (4000KS), interconnect J107 (4101VC)/P107 (4101VC-A) and connector P54 (4069KS-P54) from the VORV (4069KS). Use a MULTIMETER - STANDARD to do a test of the VORV (4069KS) Linear Variable Differential Transducer (LVDT) and Torque Motor (TM) circuits in the harnesses. Refer to Table 1, Table 2, Table 3 and Table 4. Look for:
1 Wire-to-wire shorts
2 Shorts to ground
3 Continuity (less than 5 ohms resistance).

NOTE: A short to ground is found when the resistance is less than 100 000 (100K) ohms.

Table 1: VORV (4069KS) TM Channel A Connector Contacts

W04 (4088KS) Harness P3 (4000KS-P3) EEC (4000KS) Connector Contacts	W04 (4088KS) Harness J107 (4101VC) Connector Contacts	W03 (4087KS) Harness P107 (4101VC-A) Connector Contacts	W03 (4087KS) Harness P54 (4069KS-P54) VORV (4069KS) Connector Contacts
EE	18	18	7
MM	19	19	6

Table 2: VORV (4069KS) LVDT Channel A Connector Contacts

W04 (4088KS) Harness P3 (4000KS-P3) EEC (4000KS) Connector Contacts	W04 (4088KS) Harness J107 (4101VC) Connector Contacts	W03 (4087KS) Harness P107 (4101VC-A) Connector Contacts	W03 (4087KS) Harness P54 (4069KS-P54) VORV (4069KS) Connector Contacts
V	35	35	9
s	36	36	8
GG	1	1	1
NN	6	6	2
FF	7	7	4

Table 3: VORV (4069KS) TM Channel B Connector Contacts

W03 (4087KS) Harness P4 (4000KS-P4) EEC (4000KS) Connector Contacts	W03 (4087KS) Harness P54 (4069KS-P54) VORV (4069KS) Connector Contacts
EE	11
MM	12

Table 4: VORV (4069KS) LVDT Channel B Connector Contacts

W03 (4087KS) Harness P4 (4000KS-P4) EEC (4000KS) Connector Contacts	W03 (4087KS) Harness P54 (4069KS-P54) VORV (4069KS) Connector Contacts
V	5
s	15
GG	14
NN	3
FF	13

(b) If a problem is found with the harnesses or connectors:
1 Replace W04 HARNESS [4088KS] AMM 73-21-64-000-802 and AMM 73-21-64-400-802, or
2 Replace W03 HARNESS [4087KS] AMM 73-21-63-000-802 and AMM 73-21-63-400-802.
3 Do the test given in Para. 3.
(7) If no problems are found with the harnesses or the fault continues:
(a) Replace the [4000KS] AMM 73-21-01-000-801 and AMM 73-21-01-400-801.
(b) Do the test given in Para. 3.

5. Close-up
Subtask 79-21-00-860-067-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(a) Close the thrust reverser cowl-doors AMM 78-36-00-410-802.

[Rev.8 from Aug 2018] 2026.04.04 04:38:35 UTC