Removal of the Speed Sensors (131-9(A))

TASK 49-71-13-000-003-A
Removal of the Speed Sensors (131-9(A))

WARNING: DO NOT TOUCH THE APU UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS WHEN YOU DO THE MAINTENANCE TASK(S).

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 4M (13 FT)-ADJUSTABLE
No specific	AR	CAP - BLANKING
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
315AL, 316AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 49-90-00-600-007-A	Check Oil Level and Replenish (131-9(A))
TASK 52-41-00-010-001-A	Open the APU Doors for Access
Speed Sensor

3. Job Set-up
Subtask 49-71-13-860-056-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).
(2) On the panel 25VU, make sure that the APU MASTER SW p/bsw is OFF.
(3) Put a warning notice in the cockpit to tell persons not to start the APU.
(4) Make sure that the hydraulic systems are depressurized
(Ref. AMM TASK 29-00-00-864-001).

Subtask 49-71-13-865-058-A ** ON A/C NOT FOR ALL

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41

Subtask 49-71-13-010-053-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position below the APU access doors 315AL and 316AR.
(2) Open the APU access doors 315AL 316AR (Ref. AMM TASK 52-41-00-010-001).
(3) Set the LIGHT control SW 11LJ to the ON position.

4. Procedure

WARNING: WHEN YOU REMOVE THE SPEED SENSOR, MAKE SURE TO WEAR PROTECTIVE EQUIPMENT. HOT OIL SPILLED FROM THE APU CAN CAUSE YOU INJURY.

Subtask 49-71-13-210-050-A ** ON A/C NOT FOR ALL

A. Check of the APU Oil Level
(1) Do a check of the APU oil level (Ref. AMM TASK 49-90-00-600-007).

NOTE: An over-serviced APU can spill oil when the speed sensor is removed.

Subtask 49-71-13-020-052-A ** ON A/C NOT FOR ALL

B. Removal of the Speed Sensor
(1) Disconnect the electrical connector (1).
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Loosen the nut (5) and remove the speed sensor (2).
(4) Remove and discard the O-rings (3) and (4).
(5) Put the PLUG-BLANKING in each disconnected line end.

[Rev.10 from 2021] 2026.04.01 01:32:03 UTC