D+P Flange Monitoring Failure

TASK 77-32-00-810-826-A
D+P Flange Monitoring Failure

1. Possible Causes

W03 HARNESS [4087KS]
PROGNOSTICS AND HEALTH MANAGEMENT UNIT [4609KS]
SENSOR-VIBRATION,FWD [4068KS]
SENSOR-VIBRATION,AFT [4067KS]
[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 73-21-00-710-806	Test No.7 - EEC Operation Test (Self 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 77-31-01-000-801	Removal of the Prognostics and Health Management Unit (PHMU)
AMM 77-31-01-400-801	Installation of the Prognostics and Health Management Unit (PHMU)
AMM 77-32-21-000-801	Removal of the Forward Vibration Sensor
AMM 77-32-21-400-801	Installation of the Forward Vibration Sensor
AMM 77-32-22-000-801	Removal of the Aft Vibration Sensor N1
AMM 77-32-22-400-801	Installation of the Aft Vibration Sensor N1
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 and PHMU Wiring Harnesses
Forward Vibration Sensor Harness
Forward Vibration Sensor Schematic
Aft Vibration Sensor Harness
Aft Vibration Sensor Schematic
PHMU Wiring Schematic

3. Fault Confirmation
Subtask 77-32-00-710-078-A ** ON A/C NOT FOR ALL

A. Do the EEC system interactive test to confirm this fault. Refer to FADEC self test AMM 73-21-00-710-806.

NOTE: The Electronic Engine Control (EEC) channel A and channel B is reporting the circuit for the Forward (FWD) and aft vibration sensors is open or shorted. The FWD and aft vibration sensors are monitored by the Prognostics and Health Management Unit (PHMU). The PHMU provides N1, N2, and Nf vibration information to both channel A and channel B of the EEC over two separate Controller Area Network (CAN) busses. The FWD vibration sensor is attached to the compressor intermediate case, located at the 9 o'clock position. The aft vibration sensor is attached to the engine core, located at the 3 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).

(1) If the maintenance message does not come back, examine the harness 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.
(2) 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 77-32-00-810-077-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) Examine the W03 (4087KS) harness and connector P10 (4609KS-P10) - PHMU (4609KS) and connector P51 (4068KS-P51) - FWD vibration sensor (4068KS) and connector P32 (4067KS-P32) - Aft vibration sensor (4067KS), for problems which are possible between the PHMU (4609KS), the FWD vibration sensor (4068KS) and the aft vibration sensor (4067KS).
(a) Inspect for harness damage.
(b) Inspect for loose or damaged connectors.

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

(c) If a problem is found with the harness or connectors:
1 Replace W03 HARNESS(4087KS) AMM 73-21-63-000-802 and AMM 73-21-63-400-802.
2 Do the test given in Para. 3.
(3) If no problems are found with the harness or the fault continues, use a PLIERS - JAWED, SOFT to disconnect electrical connector P10 (4609KS-P10) from the PHMU (4609KS) and connector P51 (4068KS-P51) from the FWD vibration sensor (4068KS) and connector P32 (4067KS-P32) from the aft vibration sensor (4067KS).
(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 connector P10 (4609KS-P10) to the PHMU (4609KS) and connector P51 (4068KS-P51) to the FWD vibration sensor (4068KS) and connector P32 (4067KS-P32) to the aft vibration sensor (4067KS).
(d) Do the test given in Para. 3.
(4) If the fault continues:
(a) Disconnect electrical connector P10 (4609KS-P10) from the PHMU (4609KS) and connector P51 (4068KS-P51) from the FWD vibration sensor (4068KS) and connector P32 (4067KS-P32) from the aft vibration sensor (4067KS). Use a MULTIMETER - STANDARD to test the FWD and aft vibration sensor (4068KS) and (4067KS) circuits in the harness. 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: Forward Vibration Sensor Connector Contacts

W03 (4087KS) Harness P10 (4609KS-P10) PHMU (4609KS) Connector Contacts	W03 (4087KS) Harness P51 (4068KS-P51) FWD Vibration Sensor(4068KS) Connector Contacts
i	3
U	2

Table 2: Aft Vibration Sensor Connector Contacts

W03 (4087KS) Harness P10 (4609KS-P10) PHMU (4609KS) Connector Contacts	W03 (4087KS) Harness P32 (4067KS-P32) Aft Vibration Sensor(4067KS) Connector Contacts
R	3
g	2

(b) If a problem is found with the harness or connectors:
1 Replace W03 HARNESS [4087KS] AMM 73-21-63-000-802 and AMM 73-21-63-400-802.
2 Do the test given in Para. 3.
(5) If no problems are found with the harness or the fault continues:
(a) Replace the PROGNOSTICS AND HEALTH MANAGEMENT UNIT [4609KS] AMM 77-31-01-000-801 and AMM 77-31-01-400-801.
(b) Do the test given in Para. 3.
(6) If the fault continues:
(a) Check the FWD vibration sensor (4068KS) and aft vibration sensor (4067KS) for looseness. Tighten if found loose. Refer to AMM 77-32-21-400-801 and AMM 77-32-22-400-801.
(b) Do the test given in Para. 3.
(7) If the fault continues:
(a) Replace SENSOR-VIBRATION,FWD [4068KS] AMM 77-32-21-000-801 and AMM 77-32-21-400-801.
(b) Do the test given in Para. 3.
(8) If the fault continues:
(a) Replace SENSOR-VIBRATION,AFT [4067KS] AMM 77-32-22-000-801 and AMM 77-32-22-400-801.
(b) Do the test given in Para. 3.
(9) If 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 77-32-00-860-052-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 04:37:54 UTC