Removal of the Speed Sensor Guide Tube [CFMB]

TASK 72-23-00-000-802-A
Removal of the Speed Sensor Guide Tube

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

1. Reason for the Job
Do this task only if you find oil leak at the strut No.6.
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	CONTAINER 1 L (1/4 USGAL)
No specific	AR	PLUG - BLANKING
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 77-11-10-000-002-A	Removal of the N1 Speed Sensor
Speed Sensor Guide Tube

3. Job Set-up
Subtask 72-23-00-941-110-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
(4) Put an ACCESS PLATFORM 1M(3 FT) in position.

Subtask 72-23-00-010-142-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors: (Ref. AMM TASK 71-13-00-010-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR

4. Procedure
Subtask 72-23-00-020-069-A ** ON A/C NOT FOR ALL

A. Removal of the Speed Sensor Guide Tube from Strut No. 6 of the Fan Frame
(1) Remove the N1 speed sensor (Ref. AMM TASK 77-11-10-000-002).
(2) Remove the bolts (10) and the sleeve (20).
(3) Put a CONTAINER 1 L (1/4 USGAL) below the strut No. 6 to collect the oil leak.
(4) Slowly and carefully, disengage the speed sensor guide tube (30) from strut No. 6.
(5) Put a PLUG - BLANKING on the port of the strut No. 6.
(6) Remove the CONTAINER 1 L (1/4 USGAL).
(7) Remove and discard the O-ring (40) and the O-ring (50) of the speed sensor guide tube (30).
(8) Do a check of the speed sensor guide tube (30) for cracks. If any crack is found, replace the guide tube.

[Rev.10 from 2021] 2026.04.01 02:41:46 UTC