Installation of the Speed Sensor Guide Tube [CFMB]

TASK 72-23-00-400-802-A
Installation 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.

WARNING: WEAR APPLICABLE PERSONAL PROTECTIVE EQUIPMENT (PPE) WHEN YOU DO THIS TASK. BEFORE YOU USE PPE, READ, UNDERSTAND AND OBEY ALL INSTRUCTIONS FOR ITS USE. THESE INSTRUCTIONS INCLUDE INSTRUCTIONS FROM THE MANUFACTURER, YOUR EMPLOYER AND GOVERNMENT REGULATIONS. YOU CAN GET INJURED IF YOU DO NOT USE PPE. GET INSTRUCTIONS FROM YOUR EMPLOYER ON WHICH PPE IS NECESSARY.

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	AR	PLUG - BLANKING
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 157.5 and 142.5 lbf.in (1.78 and 1.61 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2442)	engine oil
(Material No.CP5070)	vaseline

C. Work Zones and Access Panels

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

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
50	PACKING	AIPC 72-23-00-15-060
40	PACKING	AIPC 72-23-00-15-070

E. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-710-006-B	Minimum Idle Check
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-B	Closing of the Fan Cowl Doors
TASK 77-11-10-400-002-A	Installation of the N1 Speed Sensor
Speed Sensor Guide Tube

3. Job Set-up
Subtask 72-23-00-860-066-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
(3) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.

Subtask 72-23-00-010-143-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the fan cowl doors are open: (Ref. AMM TASK 71-13-00-010-040)
(2) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(3) FOR [1000EM2] (ENGINE-2)
447AL 448AR

4. Procedure

WARNING: USE PERSONAL PROTECTION EQUIPMENT. USE THE ENGINE OIL IN A WELL-VENTILATED AREA. ENGINE OIL IS TOXIC.

Subtask 72-23-00-420-077-A ** ON A/C NOT FOR ALL

A. Installation of the Speed Sensor Guide Tube in the Fan Frame Strut No. 6.
(1) Lightly lubricate the new AIPC 72-23-00-15-070 PACKING (40) and the new AIPC 72-23-00-15-060 PACKING (50) with vaseline (Material No.CP5070) .
(2) Remove the PLUG - BLANKING from the strut No. 6 of the fan frame (60).
(3) Install the new O-ring (40) in the lower groove of the speed sensor guide tube (30).

NOTE: The new O-ring (40) and the new O-ring (50) are installed on the speed sensor guide tube (30) by the upper end of the tube.

(4) Install the new O-ring (50) in the upper groove of the speed sensor guide tube (30).
(5) Install the speed sensor guide tube (30) in the strut No. 6 of the fan frame (60).
(6) Install the sleeve (20) on the end of the speed sensor guide tube (30) which comes out of the fan frame (60).

NOTE: The angular alignment of the sleeve (20) is given by the bolt holes on the sleeve.

(7) Lightly lubricate the threads of the bolts (10) with engine oil (Material No.CP2442) .
(8) Attach the sleeve (20) with the bolts (10).
(9) TORQUE the bolts (10) to between 157.5 and 142.5 lbf.in (1.78 and 1.61 m.daN )

.
(10) Install the N1 speed sensor (Ref. AMM TASK 77-11-10-400-002).
(11) Do a minimum idle check (Ref. AMM TASK 71-00-00-710-006).

5. Close-up
Subtask 72-23-00-410-135-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 fan cowl doors: (Ref. AMM TASK 71-13-00-410-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(3) Remove the WARNING NOTICE(S).
(4) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 02:41:47 UTC