Inspection/Check of the TAT Sensor

TASK 34-11-18-200-002-A
Inspection/Check of the TAT Sensor

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

ZONE: 121
ZONE: 122
FIN: 11FP1
FIN: 11FP2

1. Reason for the Job
The purpose of this Task is to do a Visual Inspection of the TAT sensor
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WATER SOURCE - GROUND

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08ABC1)	Aqueous Cleaner-Aircraft Exterior Pressure Spraying -
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
121	AVIONICS COMPARTMENT
122	AVIONICS COMPARTMENT

D. Referenced Information

REFERENCE	DESIGNATION
TASK 34-11-18-000-001-A	Removal of the TAT Sensor
TASK 34-11-18-400-001-A	Installation of the TAT Sensor
TASK 34-11-18-000-001-A	Removal of the TAT Sensor (for corrective action)
TASK 34-11-18-400-001-A	Installation of the TAT Sensor (for corrective action)

3. Job Set-up
Subtask 34-11-18-865-054-A

A. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	COM NAV/RADAR/1	5SQ1	K13
** ON A/C NOT FOR ALL
121VU	COM NAV/RADAR/2	5SQ2	K14
** ON A/C ALL
FOR FIN: 11FP1 (SENSORTAT, 1)
49VU	ANTI ICE/PROBES/AOA/1	4DA1	D04
49VU	ANTI ICE/PROBES/PHC/1	2DA1	D03
49VU	ANTI ICE/PROBES/PITOT/1	3DA1	D02
49VU	NAV PROBES/ADIRU1/115VAC	4FP1	F06
121VU	ADIRS/ADIRU/3/115VAC	4FP3	N05
122VU	ANTI ICE/PROBES/1/STATIC	5DA1	Z13
122VU	ANTI ICE/PROBES/1/TAT	1DA1	Z12
FOR FIN: 11FP2 (SENSORTAT, 2)
121VU	ADIRS/ADIRU/2/115VAC	4FP2	N06
122VU	ANTI ICE/PROBES/2/TAT	1DA2	Y15
122VU	ANTI ICE/PROBES/2/PITOT	3DA2	Y14
122VU	ANTI ICE/PROBES/2/AOA	4DA2	Y13
122VU	ANTI ICE/PROBES/PHC/2	2DA2	Y12
122VU	ANTI ICE/PROBES/2/STATIC	5DA2	Y11

Subtask 34-11-18-860-056-A

B. Get Access
(1) Put an ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position in zone 120.
(2) Remove the TAT sensor slip-on cover.

4. Procedure
Subtask 34-11-18-220-050-A

A. Inspection/Check of the Total Air Temperature (TAT) Sensors (11FP1, 11FP2)
(1) Do a general visual inspection of the TAT sensors:
(a) Color
With time, the color of the sensor becomes brown and/or black.
This coloration has no effect on the operation of the sensor.
(b) Internal obstruction
1 Make sure that the TAT sensor is not clogged.

CAUTION: DO NOT USE SHARP AND/OR METAL TOOLS OR OBJECTS TO CLEAN THE TAT SENSOR. SUCH TOOLS OR OBJECTS CAN CAUSE DAMAGE TO THE TAT SENSOR.

a If the TAT sensor is clogged, remove it (Ref. AMM TASK 34-11-18-000-001).

Send the TAT sensor to the workshop.
Install the TAT sensor (Ref. AMM TASK 34-11-18-400-001).

CAUTION: DO NOT USE ROUGH ABRASIVE CLEANERS. IF YOU DO, YOU CAN CAUSE DAMAGE TO THE PLATING.

1 Clean the surfaces of the TAT sensor with a solution of WATER SOURCE - GROUND and Aqueous Cleaner-Aircraft Exterior Pressure Spraying - (Material No.08ABC1) .
2 Use a moist clean Textile-Lint free Cotton - (Material No.14SBA1) and remove the contamination. Make the Textile-Lint free Cotton - (Material No.14SBA1) moist with an applicable Non Aqueous Cleaner-General - - (Material No.08BAA9) .
3 Flush the unit fully with clean WATER SOURCE - GROUND.
(d) If there are signs of lightning strike (burn marks, spots, etc.) on one of the TAT sensors, replace it (Ref. AMM TASK 34-11-18-000-001) and (Ref. AMM TASK 34-11-18-400-001).
(e) If the TAT sensor is not in the correct condition (oxidation, impact marks, cracks, ...) replace it (Ref. AMM TASK 34-11-18-000-001) and (Ref. AMM TASK 34-11-18-400-001).

5. Close-up
Subtask 34-11-18-865-055-A

A. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	COM NAV/RADAR/1	5SQ1	K13
** ON A/C NOT FOR ALL
121VU	COM NAV/RADAR/2	5SQ2	K14
** ON A/C ALL
FOR FIN: 11FP1 (SENSORTAT, 1)
49VU	ANTI ICE/PROBES/AOA/1	4DA1	D04
49VU	ANTI ICE/PROBES/PHC/1	2DA1	D03
49VU	ANTI ICE/PROBES/PITOT/1	3DA1	D02
49VU	NAV PROBES/ADIRU1/115VAC	4FP1	F06
121VU	ADIRS/ADIRU/3/115VAC	4FP3	N05
122VU	ANTI ICE/PROBES/1/STATIC	5DA1	Z13
122VU	ANTI ICE/PROBES/1/TAT	1DA1	Z12
FOR FIN: 11FP2 (SENSORTAT, 2)
121VU	ADIRS/ADIRU/2/115VAC	4FP2	N06
122VU	ANTI ICE/PROBES/2/TAT	1DA2	Y15
122VU	ANTI ICE/PROBES/2/PITOT	3DA2	Y14
122VU	ANTI ICE/PROBES/2/AOA	4DA2	Y13
122VU	ANTI ICE/PROBES/PHC/2	2DA2	Y12
122VU	ANTI ICE/PROBES/2/STATIC	5DA2	Y11

Subtask 34-11-18-860-057-A

B. Put the aircraft back to its initial configuration.
(1) Install the TAT sensor slip-on cover.
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 00:58:34 UTC