Visual Inspection of the T12 Sensor [CFML]

TASK 73-21-15-210-801-A
Visual Inspection of the T12 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.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

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) - ADJUSTABLE
No specific	1	PLIERS - CONNECTOR, JAW, SOFT
No specific	AR	WARNING NOTICE(S)

B. Referenced Information

REFERENCE	DESIGNATION
TASK 71-60-42-000-801-A	Removal of the Air Intake Cowl T12 Access Panel
TASK 71-60-42-400-801-A	Installation of the Air Intake Cowl T12 Access Panel
TASK 73-21-15-000-801-A	Removal of the T12 Sensor
TASK 73-21-15-400-801-A	Installation of the T12 Sensor
TASK 73-29-00-710-802-A	FADEC Test (Menu Mode)
Visual Inspection of the T12 Sensor

3. Job Set-up
Subtask 73-21-15-941-057-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate:

The ENG/MODE selector switch
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 73-21-15-010-056-A

B. Get Access
(1) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
(2) Remove the air intake cowl T12 panel (4) (Ref. AMM TASK 71-60-42-000-801).

4. Procedure
Subtask 73-21-15-220-050-A

A. Visual Inspection of the T12 Sensor
(1) Disconnect the HJ8A engine wiring harness (2) from the T12 sensor receptacle (3).
(a) If necessary, use the PLIERS - CONNECTOR, JAW, SOFT.
(2) Do the visual inspection of the T12 sensor (1) for the indications that follow:
Table 601 - Visual Inspection of All Surfaces (Entire Sensor)

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
Cracks	No serviceable	Replace the T12 sensor (Ref. AMM TASK 73-21-15-000-801) and (Ref. AMM TASK 73-21-15-400-801).
Discoloration	A light discoloration from straw to dark grey is permitted	Replace the T12 sensor (Ref. AMM TASK 73-21-15-000-801) and (Ref. AMM TASK 73-21-15-400-801).

Table 602 - Visual Inspection of Connector Housing (5) and Plate (6)

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
Cracks, dents and gouges	Serviceable, if nicks, dents or gouges which are less than 0.025 in. (0.63 mm) in depth	Replace the T12 sensor (Ref. AMM TASK 73-21-15-000-801) and (Ref. AMM TASK 73-21-15-400-801).

Table 603 - Visual Inspection of Sensor Housing (7) and Airfoil Leading Edge (A) (8)

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
Nicks, dents and gouges	Serviceable, if nicks, dents or gouges which are less than 0.025 in. (0.63 mm) in depth	Replace the T12 sensor (Ref. AMM TASK 73-21-15-000-801) and (Ref. AMM TASK 73-21-15-400-801).
Abrasion, wear	Wear (erosion) up to 0.08 in. (2.03 mm) deep from the leading edge of the airfoil is allowed	Replace the T12 sensor (Ref. AMM TASK 73-21-15-000-801) and (Ref. AMM TASK 73-21-15-400-801).

Table 604 - Visual Inspection of Weld Joints (A) (9)

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
Nicks, dents and gouges	Not serviceable	Replace the T12 sensor (Ref. AMM TASK 73-21-15-000-801) and (Ref. AMM TASK 73-21-15-400-801).

Table 605 - Visual Inspection of Connector Pins (10)

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
Scratches, nicks, dents, marks or discoloration	Not serviceable	Replace the T12 sensor (Ref. AMM TASK 73-21-15-000-801) and (Ref. AMM TASK 73-21-15-400-801).
Missing pins	Not serviceable	Replace the T12 sensor (Ref. AMM TASK 73-21-15-000-801) and (Ref. AMM TASK 73-21-15-400-801).

Table 606 - Visual Inspection of Sensor Housing: Airfoil Opening (A) (11)

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
Foreign material debris	Serviceable. Follow cleaning procedure to remove foreign material debris
Bending	Bending or distortion up to 0.032 in. (0.81 mm) allowed	Replace the T12 sensor (Ref. AMM TASK 73-21-15-000-801) and (Ref. AMM TASK 73-21-15-400-801).

Table 607 - Visual Inspection of Rivet and/or Nut Plate (12)

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
Missing rivet or nut plate	Not serviceable	Replace the T12 sensor (Ref. AMM TASK 73-21-15-000-801) and (Ref. AMM TASK 73-21-15-400-801).

Table 608 - Visual Inspection of the Connector (13)

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
Incomplete fully coupled indicator line	The engagement line must have 100 percent coverage with no areas missing	Replace the T12 sensor (Ref. AMM TASK 73-21-15-000-801) and (Ref. AMM TASK 73-21-15-400-801).

Table 609 - Visual Inspection of Thread of the Connector (14), Thread of the Floating Nut Plates

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
Worn/missing thread	Serviceable, if less than 20 percent of the thread length	Replace the T12 sensor (Ref. AMM TASK 73-21-15-000-801) and (Ref. AMM TASK 73-21-15-400-801).

5. Close-up
Subtask 73-21-15-710-050-A

A. Test
(1) Do the FADEC test (menu mode) (Ref. AMM TASK 73-29-00-710-802).

Subtask 73-21-15-410-054-A

B. Close Access
(1) Install the air intake cowl T12 panel (Ref. AMM TASK 71-60-42-400-801).

Subtask 73-21-15-942-050-A

C. Put the aircraft back to its initial configuration.
(1) Remove the access platform(s).
(2) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:04:32 UTC