Electronic Engine Control (EEC) Sensing System Check [PW11]

TASK 73-21-00-200-806-A
Electronic Engine Control (EEC) Sensing System Check

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 INSTRUCTION, INJURY CAN OCCUR.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

CAUTION: DO NOT PUT AIR PRESSURE INTO THE EEC. IF YOU DO, THERE IS A RISK OF DAMAGE TO EQUIPMENT.

ZONE: 400

1. Reason for the Job
Use this procedure to verify that the Electronic Engine Control (EEC) pneumatic input signal sources are not leaking.

NOTE: Any EEC monitored faults are transmitted to the aircraft Centralized Fault Display System (CFDS). The CFDS allows interactive dialog with the EEC. Use the CFDS to review any EEC related faults. If there are any EEC sensor related faults reported, troubleshoot them first.

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

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.P05-007)	Leak Check fluid

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-860-832-A	Procedure to Prevent Engine Motoring and to Stop the Electrical Supply to the EEC
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 72-21-05-000-803-A	Removal of the Fan Exit Structural Guide Vane (SGV) Outer Liner Segment
TASK 72-21-05-400-803-A	Installation of the Fan Exit Structural Guide Vane (SGV) Outer Liner Segment
TASK 73-21-01-000-801-A	Removal of the Electronic Engine Control (EEC)
TASK 73-21-01-400-801-A	Installation of the Electronic Engine Control (EEC)
TASK 73-25-34-400-802-A	Installation of the Engine Interface Unit (EIU)
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
TASK 78-36-00-410-802-A	Closing of the Thrust Reverser Cowl-Doors
Electronic Engine Control Sensing System Check

3. Job Set-up
Subtask 73-21-00-941-063-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Make sure that you did the procedure to prevent engine motoring and to stop the electrical supply to the Electronic Engine Control (EEC)
(Ref. AMM TASK 71-00-00-860-832).

Subtask 73-21-00-010-064-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.

Subtask 73-21-00-040-056-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser for Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 73-21-00-010-065-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR

4. Procedure
Subtask 73-21-00-210-056-A ** ON A/C NOT FOR ALL

A. Check of the Electronic Engine Control (EEC) Sensing System
(1) Check the EEC sense tube (AS01) as follows:
(a) Remove the Fan Exit Guide Vane (FEGV) outer liner adjacent to the air sense tube port (Ref. AMM TASK 72-21-05-000-803).
(b) Make sure that the port is clear of debris and blockage.
(c) Make sure that the air sense tube (AS01) connections between the fan case and the EEC are secure.
(d) Make sure that the tube is not cracked or broken.
(e) Make sure that the tube is not chafed at the clamp locations.
(f) Make sure that all the attaching brackets are secure.
(g) Disconnect the air sense tube (AS01) from the EEC (Ref. AMM TASK 73-21-01-000-801).
(h) Make sure that the regulator is adjusted to 0 psi (0.00 bar) and then connect a regulated, clean, dry air pressure supply to the air sense tube (AS01).
(i) Supply 100 psi (6.89 bar) to the air sense tube (AS01).
(j) Listen for air at the air tube sense port. Air should be passing through the tube and port.
(k) Use Leak Check fluid (Material No.P05-007) to check the air sense tube (AS01) tube for leaks.
(l) Adjust the air supply to 0 psi (0.00 bar).
(m) Repair any clogs or leaks as required. If you find any problems, do the check again.
(n) Connect the air sense tube (AS01) to the EEC (Ref. AMM TASK 73-21-01-400-801).
(o) Install the FEGV outer liner adjacent to the air sense tube port (Ref. AMM TASK 72-21-05-400-803).
(2) Examine the assembly for foreign objects, damage and correct assembly.

5. Close-up
Subtask 73-21-00-410-060-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR

Subtask 73-21-00-440-056-A ** ON A/C NOT FOR ALL

B. Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 73-21-00-410-061-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).
(4) Make sure that all the circuit breakers shown in the paragraph Procedure of the engine interface unit installation are closed. If they are not, close them in the recommended sequence
(Ref. AMM TASK 73-25-34-400-802).

[Rev.10 from 2021] 2026.04.01 03:02:40 UTC