Removal of the P25 Sensor [CFMB]

TASK 73-21-80-000-002-A
Removal of the P25 Sensor

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
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, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 78-30-00-481-041-B	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-B	Opening of the Thrust Reverser Doors
Removal/Installation of the P25 Sensor

3. Job Set-up
Subtask 73-21-80-941-052-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).

Subtask 73-21-80-010-056-A ** ON A/C NOT FOR ALL

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

Subtask 73-21-80-040-054-A ** ON A/C NOT FOR ALL

C. Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041).

Subtask 73-21-80-010-060-A ** ON A/C NOT FOR ALL

D. Open the thrust reverser doors: (Ref. AMM TASK 78-36-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR

4. Procedure
Subtask 73-21-80-010-057-A ** ON A/C NOT FOR ALL

A. Preparation for the removal of the P25 sensor.

CAUTION: USE TWO WRENCHES TO REMOVE OR INSTALL THE TUBE COUPLING NUTS:

ONE WRENCH TO HOLD THE UNION, AND
ONE TO LOOSEN OR TIGHTEN THE COUPLING NUT.

THIS PREVENTS DAMAGE TO THE PARTS.

(1) Loosen the 4 bolts that attach the fan frame duct panel between the 5 and 6 o'clock struts . Remove fan frame duct panel
(2) Cut and remove the lockwire. Disconnect the coupling nut of the P25 pressure tube (30) from the P25 sensor nipple.
(3) Cut and remove the lockwire. Disconnect the P25 tube (50) from the P25 pressure tube (30) in the 6 o'clock junction box.
(4) Loosen the nut (40) and disengage the P25 pressure tube (30) from the P25 sensor (10).

Subtask 73-21-80-020-051-A ** ON A/C NOT FOR ALL

B. Removal of the P25 sensor.
(1) Loosen the 3 captive bolts (20) and remove the P25 sensor (10) from the fan frame.
(2) Put the PLUG-BLANKING in each disconnected line end.

[Rev.10 from 2021] 2026.04.01 13:05:51 UTC