Visual Inspection of the P25 Sensor [CFMB]

TASK 73-21-80-210-002-A
Visual Inspection 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	ACCESS PLATFORM 1M(3 FT)
No specific	AR	BRUSH - BRISTLED
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP1039)	acetone
(Material No.CP1041)	isopropyl alcohol
(Material No.CP2559)	ardrox 552
(Material No.CP2560)	turco ind 79
(Material No.CP2566)	mag-chem teksol
(Material No.CP2584)	degreasol 99 R
(Material No.CP2656)	mag-chem skysol

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 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 72-23-00-000-027-A	Removal of the Fan Duct Panels
TASK 72-23-00-400-027-A	Installation of the Fan Duct Panels
TASK 73-21-80-000-002-A	Removal of the P25 Sensor
TASK 73-21-80-400-002-A	Installation of the P25 Sensor
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
P25 Sensor

3. Job Set-up
Subtask 73-21-80-941-053-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 73-21-80-010-058-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
(4) Put the ACCESS PLATFORM 1M(3 FT) in position.

Subtask 73-21-80-040-055-A ** ON A/C NOT FOR ALL

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

Subtask 73-21-80-010-059-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the right thrust-reverser door (Ref. AMM TASK 78-36-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
452AR
(b) FOR [1000EM2] (ENGINE-2)
462AR
(2) Removal of the fan duct panel.
(a) Remove the fan duct panel between struts No.6 and No.7 (Ref. AMM TASK 72-23-00-000-027).

4. Procedure
Subtask 73-21-80-210-051-A ** ON A/C NOT FOR ALL

A. Do the Inspection of the P25 Sensor

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.All areas for:
A.Cracks	Not serviceable	Replace the P25 sensor (Ref. AMM TASK 73-21-80-000-002) and (Ref. AMM TASK 73-21-80-400-002).
B.Nicks, dents and scratches	Any number, if not deeper than 0.03 in. (0.76 mm).	Replace the P25 sensor (Ref. AMM TASK 73-21-80-000-002) and (Ref. AMM TASK 73-21-80-400-002).
C.Dirt build-up in air inlet	Air must flow freely	Disconnect the P25 pressure tube. Clean the P25 sensor with a BRUSH - BRISTLED and isopropyl alcohol (Material No.CP1041) or acetone (Material No.CP1039) or ardrox 552 (Material No.CP2559) or turco ind 79 (Material No.CP2560) or mag-chem teksol (Material No.CP2566) or degreasol 99 R (Material No.CP2584) or mag-chem skysol (Material No.CP2656) . Blow the air passage of the P25 sensor.

5. Close-up
Subtask 73-21-80-410-058-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) Installation of the fan duct panel.
(a) Install the fan duct panel between struts No.6 and No.7 (Ref. AMM TASK 72-23-00-400-027).
(3) Close the right thrust reverser door (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
452AR
(b) FOR [1000EM2] (ENGINE-2)
462AR

Subtask 73-21-80-440-053-A ** ON A/C NOT FOR ALL

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

Subtask 73-21-80-410-057-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 access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:59:34 UTC