Inspection of the P2/T2 Sensor [IAE]

TASK 73-22-11-200-010-A
Inspection of the P2/T2 Sensor

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.

ZONE: 400

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 2M (6 FT)
No specific	1	AIR SOURCE 1.7 TO 2 BAR (25 TO 30 PSI) - FILTERED, DRY
No specific	1	LIGHT SOURCE - INSPECTION
No specific	1	NITROGEN COMPRESSED SOURCE 2 BAR (29 PSI) - DRY
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 38.5 and 31.5 lbf.in (0.44 and 0.36 m.daN )
No specific	Torque wrench: range to between 44 and 36 lbf.in (0.50 and 0.41 m.daN )
No specific	Torque wrench: range to between 145 and 135 lbf.in (1.64 and 1.53 m.daN )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS

C. Referenced Information

REFERENCE	DESIGNATION
TASK 70-23-11-911-013-A	General Torque Tightening Techniques
TASK 70-23-15-912-010-A	Connection of Electrical Connectors
P2/T2 Sensor
P2/T2 Sensor
P2/T2 Sensor

3. Job Set-up
Subtask 73-22-11-941-053-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) in position 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) in position to tell persons not to energize the FADEC 1(2).

4. Procedure
Subtask 73-22-11-010-053-A ** ON A/C NOT FOR ALL

A. Get Access

P2/T2 Sensor ** ON A/C NOT FOR ALL

(1) Put the ACCESS PLATFORM 2M (6 FT) in position to give access to the air intake cowl.
(2) Remove the 18 bolts (2). Remove the access panel (1).

Subtask 73-22-11-220-051-A ** ON A/C NOT FOR ALL

B. Examination

P2/T2 Sensor ** ON A/C NOT FOR ALL

(1) Examine the general condition of the P2/T2 sensor with the LIGHT SOURCE - INSPECTION.
(a) If it is cracked or otherwise excessively damaged - reject it.
(b) Loss of plating or discoloration, exposed base material without erosion, nicks or dents - accept it.
(c) Erosion or grooves, pits or dents in the base material or air inlet and exit ports - reject it.
(d) Dents or scratches greater than 0.079 in. (2 mm) in the area of the air inlet and exit ports - reject it.
(2) Examine the air inlet ports, element cavity and air exit slots for blockage or a restriction from foreign debris or insect matter. The larger air scoop is for the T2 sensor and the smaller circular opening is for the P2 sensor.
(a) If one or two of the inlets are blocked then clear the P2/T2 air inlet ports.
1 Disconnect the P2 tube end connectors and remove the tube (4) from the probe pressure fitting.

CAUTION: DO NOT BLOW NITROGEN OR AIR INTO THE AIR SCOOP. THE FORCE IN THIS DIRECTION CAN CAUSE ANY BLOCKAGE OR RESTRICTION TO BECOME LESS EASY TO MOVE.

2 For the T2 inlet: Blow the AIR SOURCE 1.7 TO 2 BAR (25 TO 30 PSI) - FILTERED, DRY or the NITROGEN COMPRESSED SOURCE 2 BAR (29 PSI) - DRY through the probe as follows:
a Temporary seal all the three rear exit holes (1) and one of the two rear exit ports (2). Blow through the other rear exit port.
b Temporary seal the two rear exit ports (2) and the two side rear exit holes (1). Blow through the remaining unblocked rear exit hole (1).

NOTE: A blockage or a restriction of the airflow passage in this area will also decrease the service life on the T2 sensor and have an effect on the signal accuracy of the T2 sensor.

CAUTION: USE CAUTION SO YOU DO NOT CAUSE DAMAGE TO THE TOTAL PRESSURE AIR-INLET PORT. THE SIZE OF THE AIR-INLET PORT WILL AFFECT PRESSURE MEASUREMENT.

3 For the P2 inlet: Blow the AIR SOURCE 1.7 TO 2 BAR (25 TO 30 PSI) - FILTERED, DRY or the NITROGEN COMPRESSED SOURCE 2 BAR (29 PSI) - DRY from the pressure fitting (3) so that it exits forward through the inlet.
(3) Examine the sensor connectors:
(a) Disconnect the electrical connectors from the sensor.
(b) Repair or replace the connectors if any of the following damage is found:

Contact pins are bent or damaged, contacts are not properly seating and locked in the correct position.
Cracks on the connectors pin glass.
Foreign Object Damage (FOD) or debris in or on the connector contact pins.

(c) Attach the electrical connectors to the sensor and tighten them by hand (Ref. AMM TASK 70-23-15-912-010).
(d) TORQUE the coupling nuts of the electrical connectors to between 44 and 36 lbf.in (0.50 and 0.41 m.daN )

(Ref. AMM TASK 70-23-15-912-010).

Subtask 73-22-11-230-051-A

DELETED

5. Close-up
Subtask 73-22-11-410-053-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Reconnect the P2 tube.
(a) Attach the P2 tube (4) with the end connectors to the probe pressure fitting.
(b) TORQUE the tube end connectors to between 145 and 135 lbf.in (1.64 and 1.53 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
(2) Install the access panel.
(a) Attach the access panel (1) to the air intake cowl with the 18 bolts (2).
(b) TORQUE the bolts to between 38.5 and 31.5 lbf.in (0.44 and 0.36 m.daN )

(Ref. AMM TASK 70-23-11-911-013).

Subtask 73-22-11-410-054-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:00:48 UTC