Removal of the Angle of Attack (AOA) Sensor

TASK 34-11-19-000-001-A
Removal of the Angle of Attack (AOA) Sensor

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: 127
ZONE: 128
ZONE: 231
ZONE: 232
FIN: 3FP1
FIN: 3FP2
FIN: 3FP3

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 3M (10 FT)- ADJUSTABLE
No specific	AR	CAP - BLANKING
No specific	1	SCRAPER - NON METALLIC

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08BAA9)	Non Aqueous Cleaner-General - -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
127	REAR AVIONIC COMPARTMENT
128	REAR AVIONIC COMPARTMENT
231	FWD PASSENGER COMPARTMENT
232	FWD PASSENGER COMPARTMENT

D. Referenced Information

REFERENCE	DESIGNATION
Angle of Attack (AOA) Sensor
Angle of Attack (AOA) Sensor

3. Job Set-up
Subtask 34-11-19-860-056-A

A. Aircraft Maintenance Configuration
(1) Remove the protective covers from the sensors and the probes (AOA, static, Pitot and TAT).

Subtask 34-11-19-865-056-A

B. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	ENGINE/2/FADEC A/AND EIU 2	2KS2	A05
49VU	ENGINE/1/FADEC A/AND EIU 1	2KS1	A04

Subtask 34-11-19-941-050-A

C. Safety Precautions
(1) In the cockpit, on overhead control and indicating panel 25VU:
(a) Make sure that the PROBE/WINDOW HEAT pushbutton switch is released (the ON legend is off).
(b) Make sure that this(these) circuit breaker(s) is(are) closed:

2KS1
2KS2.

Subtask 34-11-19-865-050-A

D. Open, safety and tag these circuit breakers in this sequence:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 3FP1 (SENSORANGLE OF ATTACK, 1)
49VU	NAV PROBES/ADIRU1/115VAC	4FP1	F06
49VU	NAV PROBES/ADIRU 1/AND AOA 1/26VAC	5FP1	F07
121VU	ADIRS/ADIRU/3PWR/SWTG	9FP	N09
122VU	ANTI ICE/PROBES/1/TAT	1DA1	Z12
49VU	ANTI ICE/PROBES/PITOT/1	3DA1	D02
49VU	ANTI ICE/PROBES/AOA/1	4DA1	D04
122VU	ANTI ICE/PROBES/1/STATIC	5DA1	Z13
FOR FIN: 3FP2 (SENSORANGLE OF ATTACK, 2)
121VU	ADIRS/ADIRU/2/115VAC	4FP2	N06
121VU	ADIRS/ADIRU/2/26VAC AND AOA	5FP2	N08
** ON A/C NOT FOR ALL
121VU	ADIRS/ADIRU/2PWR/SHED	10FP	N10
** 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/2/STATIC	5DA2	Y11
FOR FIN: 3FP3 (SENSORANGLE OF ATTACK, 3)
121VU	ADIRS/ADIRU/3/115VAC	4FP3	N05
121VU	ADIRS/ADIRU/3/26VAC AND AOA	5FP3	N07
121VU	ADIRS/ADIRU/3PWR/SWTG	9FP	N09
122VU	ANTI ICE/PROBES/3/PITOT	3DA3	Z16
122VU	ANTI ICE/PROBES/3/AOA	4DA3	Z15
122VU	ANTI ICE/PROBES/3/STATIC	5DA3	Z14
FOR FIN: 3FP1 (SENSORANGLE OF ATTACK, 1)
49VU	ANTI ICE/PROBES/PHC/1	2DA1	D03
FOR FIN: 3FP2 (SENSORANGLE OF ATTACK, 2)
122VU	ANTI ICE/PROBES/PHC/2	2DA2	Y12
FOR FIN: 3FP3 (SENSORANGLE OF ATTACK, 3)
122VU	ANTI ICE/PROBES/PHC/3	2DA3	Y16

Subtask 34-11-19-860-050-A

E. Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position in zone 231 for 3FP1 (232 for 3FP2) (127 for 3FP3).

4. Procedure
Subtask 34-11-19-020-050-A ** ON A/C NOT FOR ALL

CAUTION: DO NOT HOLD THE AOA SENSOR BY THE VANE WHEN YOU MOVE IT. IF YOU DO, YOU CAN CAUSE DAMAGE TO THE AOA SENSOR.

A. Removal of the Angle of Attack (AOA) Sensor (3FP1, 3FP2, 3FP3)

NOTE: The procedure is the same for AOA sensors 3FP1, 3FP2 and 3FP3.

(1) Remove the sealant from the head of the screw (7) with the SCRAPER - NON METALLIC.
(2) Loosen the seven screws (9).
(3) Carefully remove the blanking plate (8) not to cause damage to the AOA sensor (6).
(4) Remove the screw (7).
(5) Disengage and hold the AOA sensor (6).
(6) Disconnect the connector (1).
(7) Remove the AOA sensor (6).
(8) Remove and discard the seal (3).

NOTE: If the seal (3) is in a good condition (no signs of cracks or missing parts):

Do not discard this seal.
Keep this seal for a maximum of eight flight cycles.

(9) Put the CAP - BLANKING on the disconnected electrical connectors (1) and (4).
(10) Remove the remaining sealant from the fuselage with the SCRAPER - NON METALLIC and clean the area with Non Aqueous Cleaner-General - - (Material No.08BAA9) .

Subtask 34-11-19-020-050-B ** ON A/C NOT FOR ALL

CAUTION: DO NOT HOLD THE AOA SENSOR BY THE VANE WHEN YOU MOVE IT. IF YOU DO, YOU CAN CAUSE DAMAGE TO THE AOA SENSOR.

A. Removal of the Angle of Attack (AOA) Sensor (3FP1, 3FP2, 3FP3)

NOTE: The procedure is the same for AOA sensors 3FP1, 3FP2 and 3FP3.

NOTE: If the seal (3) is in a good condition (no signs of cracks or missing parts):

Do not discard this seal.
Keep this seal for a maximum of eight flight cycles.

(9) Put the CAP - BLANKING on the disconnected electrical connectors (1) and (4).

[Rev.10 from 2021] 2026.04.01 04:01:15 UTC