Removal of the NF Speed Probe [PW11]

TASK 77-11-22-000-801-A
Removal of the NF Speed Probe

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.

ZONE: 400
FIN: 4066KS ** ON A/C NOT FOR ALL

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	1	COVER - PROTECTION
No specific	1	PLIERS - JAWED, SOFT
M8196914-02	1	CONTACT INSERT EXTRACT TOOL
OR	OR
M8196917-01	1

B. Work Zones and Access Panels

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

C. 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 72-11-01-000-801-A	Removal of the Inlet Cone
TASK 72-11-03-000-801-A	Removal of the Fan Blades
TASK 72-21-02-000-803-A	Removal of the Structural Guide Vane
TASK 72-21-08-000-801-A	Removal of the Fan Exit Liner Segments
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
Removal of the NF Speed Probe from the Compressor Intermediate Case
Removal of the NF Speed Probe

3. Job Set-up
Subtask 77-11-22-941-050-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Do 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 77-11-22-010-050-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 77-11-22-040-050-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 77-11-22-010-051-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 77-11-22-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the NF Speed Probe
(1) Make sure that you wipe clean all the parts and tools to remove contamination and to prevent damage to the engine.
(2) Find the NF speed probe (1) located approximately at the 1 o'clock position on the No. 1 and No. 1.5 bearing support assembly.
(3) Remove the inlet cone (Ref. AMM TASK 72-11-01-000-801).
(4) Remove the fan blades (Ref. AMM TASK 72-11-03-000-801).
(5) Remove the appropriate fan-exit liner segments (Ref. AMM TASK 72-21-08-000-801).
(6) Remove the appropriate structural guide vane (Ref. AMM TASK 72-21-02-000-803).
(7) Disconnect the wiring harness (WC04) connector (P44) from the probe receptacle (J44) with the PLIERS - JAWED, SOFT.
(8) Remove the NF speed probe (1) from the compressor intermediate-case (CIC) bulkhead and connector (2) as follows:
(a) Remove the two bolts (5) and the connector (2) from the bulkhead.
(b) Remove the two nuts (4), screws (3) and the eyelet.
(c) Remove the backshell from the connector (2).
(d) Use the M8196914-02 CONTACT INSERT EXTRACT TOOLM8196917-01 to remove the white wire from hole No. 3 on the connector (2).
(e) Use the M8196914-02 CONTACT INSERT EXTRACT TOOLM8196917-01 to remove the white wire with blue stripe from hole No. 2 on the connector (2).
(f) Remove the backshell from the cable end.
(9) Remove the NF speed probe cable from the spring clips.
(10) Remove the NF speed probe (1) from the No. 1 and No. 1.5 bearing support assembly and the fan intermediate case as follows:
(a) Remove the bolt (14) and the clamp (15).
(b) Remove the two bolts (14) from the NF speed probe (1).
(c) Remove the cushion (17) if necessary.
(d) Remove the NF speed probe (1).

NOTE: Identify the path of the NF speed probe cable.

(e) Remove and discard the two packings (16) from the NF speed probe (1).
(11) Installation of protection covers:

CAUTION: INSTALL PROTECTION COVERS ON ALL THE OPENINGS IMMEDIATELY TO PREVENT DAMAGE TO THE ENGINE.

(a) Make sure that you install COVER - PROTECTION as necessary to prevent damage to the engine.

[Rev.10 from 2021] 2026.04.01 03:18:43 UTC