Flow Divider Valve Mechanically Stuck

TASK 73-11-00-810-844-A
Flow Divider Valve Mechanically Stuck

1. Possible Causes

FUEL FLOW DIVIDER [4090KS]
W04 HARNESS [4088KS]
WC08 HARNESS-CORE [4094KS]
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 71-00-00-860-814	Shutdown of the Engine
AMM 71-00-00-860-822	Start the Engine (Normal Manual Start)
AMM 71-00-00-860-823	Start the Engine (Normal Automatic Start)
AMM 73-11-03-000-801	Removal of the Fuel Flow Divider
AMM 73-11-03-400-801	Installation of the Fuel Flow Divider
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 73-21-68-000-802	Removal of the EEC Wiring Harness (WC08)
AMM 73-21-68-400-802	Installation of the EEC Wiring Harness (WC08)
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
EEC Wiring Harnesses
W04/WC08 Wiring Harness Interconnect
W03/W04 Wiring Harnesses Interconnect
Fuel Flow Divider Wiring Harness
Fuel Flow Divider Wiring Schematic

3. Fault Confirmation
Subtask 73-11-00-710-104-A ** ON A/C NOT FOR ALL

A. Do an engine run to idle to confirm repair of this fault AMM 71-00-00-860-822 or AMM 71-00-00-860-823.
(1) Shutdown the engine AMM 71-00-00-860-814.
(2) On MCDU screen, make sure that the fault is not displayed on ground scan report.

NOTE: The Electronic Engine Control (EEC) channel A and channel B has detected that the fuel flow divider is not in the commanded position. The fuel flow divider is mounted under the Fuel/Oil Heat Exchanger (FOHE) bypass valve, located at the 5 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).

(3) If the maintenance message does not come back, examine the harnesses and electrical connectors as described in the component and harness intermittent fault isolation procedure (Ref. TSM TASK 71-00-00-810-835).
(a) If no problems are found, return the engine to service. Monitor the engine for reoccurring maintenance message.
(4) If the maintenance message comes back (hard fault), go to the Para. Fault Isolation.

4. Fault Isolation

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE 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 73-11-00-810-105-A ** ON A/C NOT FOR ALL

A. Do as follows:
(1) Open the thrust reverser cowl-doors AMM 78-36-00-010-802.
(2) Replace FUEL FLOW DIVIDER [4090KS] AMM 73-11-03-000-801 and AMM 73-11-03-400-801.
(a) Do the test given in Para. 3.
(3) If the fault continues:
(a) Examine the W04 (4088KS), WC08 (4094KS) and W03 (4087KS) harnesses, connectors P3 (4000KS-P3) and P4 (4000KS-P4) - EEC (4000KS), interconnect P107 (4101VC-A)/J107 (4101VC), interconnect J109 (4112VC)/P109 (4112VC-A) and connector P46 (4090KS-P46) - Fuel flow divider (4090KS), for problems which are possible between the EEC (4000KS) and the fuel flow divider (4090KS).
(b) Inspect for harness 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 WC08 HARNESS-CORE(4094KS) AMM 73-21-68-000-802 and AMM 73-21-68-400-802, or
3 Replace W03 HARNESS(4087KS) AMM 73-21-63-000-802 and AMM 73-21-63-400-802.
4 Do the test given in Para. 3.
(4) If no problems are found with the harnesses or the fault continues, use a PLIERS - JAWED, SOFT to disconnect the electrical connectors P3 (4000KS-P3) and P4 (4000KS-P4) from the EEC (4000KS), interconnect P107 (4101VC-A)/J107 (4101VC), interconnect J109 (4112VC)/P109 (4112VC-A) and connector P46 (4090KS-P46) from the fuel flow divider (4090KS).
(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 the electrical connectors P3 (4000KS-P3) and P4 (4000KS-P4) to the EEC (4000KS), interconnect P107 (4101VC-A)/J107 (4101VC), interconnect J109 (4112VC)/P109 (4112VC-A) and connector P46 (4090KS-P46) to the fuel flow divider (4090KS).
(d) Do the test given in Para. 3.
(5) If the fault continues:
(a) Disconnect the electrical connectors P3 (4000KS-P3) and P4 (4000KS-P4) from the EEC (4000KS), interconnect P107 (4101VC-A)/J107 (4101VC), interconnect J109(4112VC)/P109 (4112VC-A) and connector P46 (4090KS-P46) from the fuel flow divider (4090KS). Use a MULTIMETER - STANDARD to test the fuel flow divider (4090KS) circuits in the harnesses. Refer to Table 1 and Table 2. 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: Fuel Flow Divider Channel A Connector Contacts

W04 (4088KS) Harness P3 (4000KS-P3) EEC (4000KS) Connector Contacts	W04 (4088KS) Harness J109 (4112VC) Connector Contacts	WC08 (4094KS) Harness P109 (4112VC-A) Connector Contacts	WC08 (4094KS) Harness P46 (4090KS-P46) Fuel Flow Divider (4090KS) Connector Contacts
N	20	20	2
M	21	21	3

Table 2: Fuel Flow Divider Channel B Connector Contacts

W03(4087KS) Harness P4 (4000KS-P4) EEC(4000KS) Connector Contacts	W03(4087KS) Harness P107 (4101VC-A) Connector Contacts	W04(4088KS) Harness J107 (4101VC) Connector Contacts	W04(4088KS) Harness J109 (4112VC) Connector Contacts	WC08(4094KS) Harness P109 (4112VC-A) Connector Contacts	WC08(4094KS) Harness P46 (4090KS-P46) Fuel Flow Div.(4090KS) Connector Contacts
N	46	46	22	22	5
M	47	47	23	23	4

(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 WC08 HARNESS-CORE [4094KS] AMM 73-21-68-000-802 and AMM 73-21-68-400-802, or
3 Replace W03 HARNESS [4087KS] AMM 73-21-63-000-802 and AMM 73-21-63-400-802.
4 Do the test given in Para. 3.
(6) If no problems are found with the harnesses or the fault continues:
(a) Replace [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 73-11-00-860-093-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 04:36:35 UTC