Installation of the P25 Sensor [CFMB]

TASK 73-21-80-400-002-A
Installation 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	WARNING NOTICE(S)
No specific	Torque wrench: range to between 92 and 85 lbf.in (1.04 and 0.96 m.daN )
No specific	Torque wrench: range to between 150 and 135 lbf.in (1.70 and 1.53 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2101)	graphite grease
(Material No.CP2442)	engine oil
(Material No.CP8001)	lockwire 0.032 in. (0.8 mm) dia.
(Material No.CP8002)	lockwire 0.032 in. (0.8 mm) dia

C. 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

D. Referenced Information

REFERENCE	DESIGNATION
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 78-30-00-081-041-B	Make the Thrust Reverser Serviceable after Maintenance
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
TASK 78-36-00-410-040-B	Closing of the Thrust Reverser Doors
Removal/Installation of the P25 Sensor

3. Job Set-up
Subtask 73-21-80-860-051-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) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).

Subtask 73-21-80-010-061-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) Make sure that the thrust reverser doors are open: (Ref. AMM TASK 78-36-00-010-040)
(5) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(6) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 73-21-80-040-053-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 73-21-80-420-051-A ** ON A/C NOT FOR ALL

A. Installation of the P25 sensor.
(1) Remove the blanking plugs from the disconnected line ends.
(2) Install P25 sensor (10) as follows:
(a) Lubricate threads of captive bolts (20) with graphite grease (Material No.CP2101) .
(b) Position the P25 sensor (10) in the fan frame recess.
(c) Attach the P25 sensor (10) to the fan frame with the 3 bolts (20).
(3) Lubricate threads of the P25 sensor nipple with engine oil (Material No.CP2442) .
(4) Connect the P25 pressure tube :

CAUTION: USE 2 WRENCHES TO REMOVE/INSTALL THE TUBE UNION NUT: ONE TO HOLD THE FITTING, THE OTHER TO LOOSE/TORQUE THE NUT. OTHERWISE, DAMAGE TO THE HARDWARE CAN OCCUR.

(a) Connect the P25 pressure tube (30) to the P25 sensor nipple. TORQUE the union nut to between 150 and 135 lbf.in (1.70 and 1.53 m.daN )

.
(5) TORQUE the nut (40) which attaches the P25 pressure tube (30) to the 6 o'clock junction box to between 150 and 135 lbf.in (1.70 and 1.53 m.daN )

(6) Lubricate threads of the P25 pressure tube fitting (in the 6 o'clock junction box) with engine oil (Material No.CP2442) .
(7) Connect the P25 tube (50) to the P25 pressure tube (30). TORQUE the union nut to between 150 and 135 lbf.in (1.70 and 1.53 m.daN )

.
(8) Safety the union nuts of the P25 tubes (30) and (50) with CP8001lockwire 0.032 in. (0.8 mm) dia. or or CP8002lockwire 0.032 in. (0.8 mm) dia

Subtask 73-21-80-410-055-A ** ON A/C NOT FOR ALL

B. Install fan duct panel as follows:
(1) Apply a thin layer of graphite grease (Material No.CP2101) to the threads of 4 captive attachment bolts
(2) Install fan duct panel and the bolts.
(3) Torque the four bolts to between 92 and 85 lbf.in (1.04 and 0.96 m.daN )

5. Close-up
Subtask 73-21-80-410-056-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 thrust reverser doors: (Ref. AMM TASK 78-36-00-410-040).
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 73-21-80-440-052-A ** ON A/C NOT FOR ALL

B. Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-081-041).

Subtask 73-21-80-410-059-A ** ON A/C NOT FOR ALL

C. Close Access
(1) 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
(2) Remove the WARNING NOTICE(S).

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