Functional Test of the Heating of the Angle of Attack Sensor

TASK 30-31-00-710-802-A
Functional Test of the Heating of the Angle of Attack Sensor

WARNING: MAKE SURE THAT CIRCUIT BREAKERS 2KS1 AND 2KS2 ARE CLOSED BEFORE YOU OPEN PROBE HEATER CIRCUIT-BREAKERS 1DA1(2), 3DA1(2,3), 4DA1(2,3) AND 5DA1(2,3). IF YOU DO NOT OBEY THIS INSTRUCTION: - THE PROBES WILL BECOME TOO HOT. - THIS CAN CAUSE DAMAGE TO EQUIPMENT AND INJURY TO MAINTENANCE PERSONNEL.

WARNING: BEFORE YOU OPEN PHC CIRCUIT BREAKERS 2DA1(2,3), OPEN PROBE HEATER CIRCUIT-BREAKERS 1DA1(2), 3DA1(2,3), 4DA1(2,3) AND 5DA1(2,3). IF YOU DO NOT OBEY THIS SEQUENCE: - THE PROBES WILL BECOME TOO HOT. - THIS CAN CAUSE DAMAGE TO EQUIPMENT AND INJURY TO MAINTENANCE PERSONNEL.

ZONE: 120
ZONE: 127
ZONE: 231
ZONE: 232

1. Reason for the Job
This task gives a method to measure the current in the AOA sensor heating-element.
The recorded value is necessary for:

The trouble shooting procedures, or
The inspection SB 34-1415.

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	ACCESS PLATFORM 3M (10 FT)-LOAD CAPACITY 500 KG MINI
No specific	1	MULTIMETER 115 VAC, 10 A - TRMS
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
97D34103000000	1	AOA SENSOR TOOL

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
120	AVIONICS COMPARTMENT
127	REAR AVIONIC COMPARTMENT
231	FWD PASSENGER COMPARTMENT
232	FWD PASSENGER COMPARTMENT
811

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 30-31-00-710-001-A	Operational Test of the Probe Ice Protection
TASK 52-41-00-010-002-A	Open the Avionics Compartment Doors for Access
TASK 52-41-00-410-002-A	Close the Avionics Compartment Doors after Access
TSM 30-31-00-810-808	Failure of the Angle of Attack Sensor (PHC 1)
TSM 30-31-00-810-819	Failure of the Angle of Attack Sensor (PHC 2)
TSM 30-31-00-810-830	Failure of the Angle of Attack Sensor (PHC 3)
AOA Sensor Tool Connection

3. Job Set-up
Subtask 30-31-00-861-067-A ** ON A/C NOT FOR ALL

A. Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 30-31-00-865-149-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 3FP1 (SENSORANGLE OF ATTACK, 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/ADIRU 1/AND AOA 1/26VAC	5FP1	F07
49VU	NAV PROBES/ADIRU1/115VAC	4FP1	F06
121VU	ADIRS/ADIRU/3PWR/SWTG	9FP	N09
122VU	ANTI ICE/PROBES/1/STATIC	5DA1	Z13
122VU	ANTI ICE/PROBES/1/TAT	1DA1	Z12
** ON A/C NOT FOR ALL
FOR FIN: 3FP2 (SENSORANGLE OF ATTACK, 2)
121VU	ADIRS/ADIRU/2PWR/SHED	10FP	N10
** ON A/C ALL
121VU	ADIRS/ADIRU/2/26VAC AND AOA	5FP2	N08
121VU	ADIRS/ADIRU/2/115VAC	4FP2	N06
** ON A/C NOT FOR ALL
121VU	ADIRS/2PWR/SHED &/AOA2 MON	10FP	N10
** ON A/C ALL
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
FOR FIN: 3FP3 (SENSORANGLE OF ATTACK, 3)
121VU	ADIRS/ADIRU/3PWR/SWTG	9FP	N09
121VU	ADIRS/ADIRU/3/26VAC AND AOA	5FP3	N07
121VU	ADIRS/ADIRU/3/115VAC	4FP3	N05
122VU	ANTI ICE/PROBES/PHC/3	2DA3	Y16
122VU	ANTI ICE/PROBES/3/PITOT	3DA3	Z16
122VU	ANTI ICE/PROBES/3/AOA	4DA3	Z15
122VU	ANTI ICE/PROBES/3/STATIC	5DA3	Z14

Subtask 30-31-00-860-088-A ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) On the ANTI ICE section of panel 25VU:

Make sure that the PROBE/WINDOW HEAT pushbutton switch is released (the ON legend is off).

(2) On the center pedestal, on the SWITCHING panel 8VU:

Make sure that the AIR DATA selector switch is in the NORM position.

Subtask 30-31-00-941-068-A

D. Safety Precautions
(1) Put a WARNING NOTICE(S) in position to tell persons not to use these controls:

PROBE/WINDOW HEAT pushbutton switch
AIR DATA selector switch.

(2) Remove the protective cover from the related angle of attack sensor as follows:
(a) Put an ACCESS PLATFORM 3M (10 FT)-LOAD CAPACITY 500 KG MINI in position:
1 FOR [3FP1] (SENSOR-ANGLE OF ATTACK, 1)
At zone 231
2 FOR [3FP2] (SENSOR-ANGLE OF ATTACK, 2)
At zone 232
3 FOR [3FP3] (SENSOR-ANGLE OF ATTACK, 3)
At zone 127.
(b) Remove the related protective cover.

Subtask 30-31-00-010-052-A

E. Get Access
(1) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position below the access door 811.
(2) Open the access door 811 (Ref. AMM TASK 52-41-00-010-002).

4. Procedure

CAUTION: REMOVE THE PROTECTIVE COVERS FROM THE PROBES BEFORE YOU DO THE TEST.

Subtask 30-31-00-720-052-A ** ON A/C NOT FOR ALL

A. Functional Test of the Heating of the Angle of Attack Sensor
(1) Disconnect the connector from the PHC of the related angle of attack sensor:
(a) FOR [3FP1] (SENSOR-ANGLE OF ATTACK, 1)
PHC1 (6DA1)
(b) FOR [3FP2] (SENSOR-ANGLE OF ATTACK, 2)
PHC2 (6DA2)
(c) FOR [3FP3] (SENSOR-ANGLE OF ATTACK, 3)
PHC3 (6DA3).
(2) Remove the blanking cap from the 97D34103000000 AOA SENSOR TOOL.
(3) Make sure that the switch of the 97D34103000000 AOA SENSOR TOOL is in the OFF position.
(4) Connect the disconnected cable to the 97D34103000000 AOA SENSOR TOOL.
(5) Connect a MULTIMETER 115 VAC, 10 A - TRMS, to the 97D34103000000 AOA SENSOR TOOL.
(6) Close the circuit breaker related to the angle of attack sensor:
(a) FOR [3FP1] (SENSOR-ANGLE OF ATTACK, 1)
Circuit breaker 4DA1
(b) FOR [3FP2] (SENSOR-ANGLE OF ATTACK, 2)
Circuit breaker 4DA2
(c) FOR [3FP3] (SENSOR-ANGLE OF ATTACK, 3)
Circuit breaker 4DA3.
(7) Do a check of the maximum current (Imax) at start-up:
(a) Set the switch of the 97D34103000000 AOA SENSOR TOOL to ON.
(b) With the MULTIMETER 115 VAC, 10 A - TRMS, do a check of the value of the maximum current (Imax) at start-up (in 30 seconds or less).

NOTE: The maximum current (Imax) in the heater of the AOA sensor can be measured only at start-up. After the start-up, the current decreases to its nominal consumption.

NOTE: The measured current must be more than 1.3A.
If the measured current is less than 1.3A, refer either to:

The trouble shooting procedures TSM 30-31-00-810-808 or TSM 30-31-00-810-819, or TSM 30-31-00-810-830 for corrective action, or to
The flow chart of the inspection SB 34-1415.

(d) Put the switch of the 97D34103000000 AOA SENSOR TOOL back to the OFF position.

CAUTION: AFTER YOU MEASURE THE CURRENT OF A SENSOR, LET THE SENSOR BECOME COOL (15 MIN) BEFORE YOU MEASURE THE CURRENT AGAIN. IF YOU DO NOT OBEY THIS PRECAUTION, YOU CAN CAUSE DAMAGE TO THE SENSOR.

(8) You must do the step (7) above two more times because the ageing of the angle of attack sensor can modify the result.
(9) Open the circuit breaker related to the AOA tested:
(a) FOR [3FP1] (SENSOR-ANGLE OF ATTACK, 1)
Circuit breaker 4DA1
(b) FOR [3FP2] (SENSOR-ANGLE OF ATTACK, 2)
Circuit breaker 4DA2
(c) FOR [3FP3] (SENSOR-ANGLE OF ATTACK, 3)
Circuit breaker 4DA3.
(10) Disconnect the MULTIMETER 115 VAC, 10 A - TRMS, from the 97D34103000000 AOA SENSOR TOOL.
(11) Disconnect the cable from the 97D34103000000 AOA SENSOR TOOL.
(12) Put the blanking caps on the 97D34103000000 AOA SENSOR TOOL.
(13) Connect the disconnected cable to the related PHC.

Subtask 30-31-00-010-053-A

B. Close Access
(1) Close the access door 811 (Ref. AMM TASK 52-41-00-410-002).

Subtask 30-31-00-942-062-A ** ON A/C NOT FOR ALL

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

Subtask 30-31-00-865-150-A

WARNING: CLOSE THE PHC CIRCUIT BREAKERS 2DA1(2,3) BEFORE YOU CLOSE THE PROBE HEATER CIRCUIT-BREAKERS 1DA1(2), 3DA1(2,3), 4DA1(2,3) AND 5DA1(2,3). IF YOU DO NOT OBEY THIS SEQUENCE, THE PROBES WILL BECOME TOO HOT. THIS CAN CAUSE INJURY TO MAINTENANCE PERSONNEL AND/OR DAMAGE TO EQUIPMENT.

WARNING: MAKE SURE THAT CIRCUIT BREAKERS 2KS1 AND 2KS2 ARE CLOSED BEFORE YOU CLOSE PROBE HEATER CIRCUIT-BREAKERS 1DA1(2), 3DA1(2,3), 4DA1(2,3) AND 5DA1(2,3). IF YOU DO NOT OBEY THIS INSTRUCTION: - THE PROBES WILL BECOME TOO HOT. - THIS CAN CAUSE DAMAGE TO EQUIPMENT AND INJURY TO MAINTENANCE PERSONNEL.

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 3FP1 (SENSORANGLE OF ATTACK, 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/ADIRU 1/AND AOA 1/26VAC	5FP1	F07
49VU	NAV PROBES/ADIRU1/115VAC	4FP1	F06
121VU	ADIRS/ADIRU/3PWR/SWTG	9FP	N09
122VU	ANTI ICE/PROBES/1/STATIC	5DA1	Z13
122VU	ANTI ICE/PROBES/1/TAT	1DA1	Z12
** ON A/C NOT FOR ALL
FOR FIN: 3FP2 (SENSORANGLE OF ATTACK, 2)
121VU	ADIRS/ADIRU/2PWR/SHED	10FP	N10
** ON A/C ALL
121VU	ADIRS/ADIRU/2/26VAC AND AOA	5FP2	N08
121VU	ADIRS/ADIRU/2/115VAC	4FP2	N06
** ON A/C NOT FOR ALL
121VU	ADIRS/2PWR/SHED &/AOA2 MON	10FP	N10
** ON A/C ALL
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
FOR FIN: 3FP3 (SENSORANGLE OF ATTACK, 3)
121VU	ADIRS/ADIRU/3PWR/SWTG	9FP	N09
121VU	ADIRS/ADIRU/3/26VAC AND AOA	5FP3	N07
121VU	ADIRS/ADIRU/3/115VAC	4FP3	N05
122VU	ANTI ICE/PROBES/PHC/3	2DA3	Y16
122VU	ANTI ICE/PROBES/3/PITOT	3DA3	Z16
122VU	ANTI ICE/PROBES/3/AOA	4DA3	Z15
122VU	ANTI ICE/PROBES/3/STATIC	5DA3	Z14

Subtask 30-31-00-710-063-A ** ON A/C NOT FOR ALL

E. Do the Operational Test of the Probe Ice Protection (Ref. AMM TASK 30-31-00-710-001).

5. Close-up
Subtask 30-31-00-862-062-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

CAUTION: DO NOT TOUCH THE AOA VANE IMMEDIATELY AFTER POWER-OFF BECAUSE IT IS VERY HOT AND CAN BURN YOU. LET THE TEMPERATURE OF THE AOA VANE DECREASE FOR A FEW MINUTES BEFORE YOU TOUCH IT.

(2) If necessary, install the protective cover on the related angle of attack sensor.
(3) Remove the access platform(s).
(4) Make sure that the work area is clean and clear of tools and other items.

[Rev.10 from 2021] 2026.04.02 06:20:07 UTC