Inspection/Check of the Lighted Icing Indicator

TASK 30-81-21-200-001-A
Inspection/Check of the Lighted Icing Indicator

WARNING: MAKE SURE THAT THE CIRCUIT BREAKERS RELATED TO THE WEATHER RADAR ARE OPENED, SAFETIED AND TAGGED.

FIN: 16DD

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 6M (20 FT)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. 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 30-81-21-000-001-A	Removal of the Lighted Icing Indicator
TASK 30-81-21-400-001-A	Installation of the Lighted Icing Indicator
ACMM 308112	(for corrective action)
Lighted Icing Indicator

3. Job Set-up
Subtask 30-81-21-861-050-A

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

Subtask 30-81-21-941-050-A

B. Put the ACCESS PLATFORM 6M (20 FT) in position.

Subtask 30-81-21-865-050-A

C. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	LIGHTING/STBY/COMP/LIGHT	1LF	H04
** ON A/C NOT FOR ALL
49VU	LIGHTING/STBY/COMP/LIGHT	1LF	H02

4. Procedure
Subtask 30-81-21-210-050-A

A. Inspection/Check of the Lighted Icing Indicator
(1) On the INT LT section of the overhead control and indicating panel 25VU, set the ICE IND & STBY COMPASS (2LF) switch to ON.
(2) Make sure that the LED of the icing indicator comes on.
(3) If the LED does not come on, do the procedure below:

Subtask 30-81-21-865-061-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	LIGHTING/STBY/COMP/LIGHT	1LF	H04
** ON A/C NOT FOR ALL
49VU	LIGHTING/STBY/COMP/LIGHT	1LF	H02

Subtask 30-81-21-020-054-A

C. Removal of the Lighted Icing Indicator
(1) Release the slotted shroud (1) and remove it.
(2) Remove the transparent cover (2).
(3) Replace the LED (3) ACMM 308112.

Subtask 30-81-21-420-054-A

D. Installation of the Lighted Icing Indicator
(1) Install the transparent cover (2).
(2) Install and tighten the slotted shroud (1).

Subtask 30-81-21-865-062-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	LIGHTING/STBY/COMP/LIGHT	1LF	H04
** ON A/C NOT FOR ALL
49VU	LIGHTING/STBY/COMP/LIGHT	1LF	H02

Subtask 30-81-21-720-052-A

F. Test
(1) On the INT LT section of the overhead control and indicating panel 25VU, set the ICE IND & STBY COMPASS switch (2LF) to ON.
(2) Make sure that the LED of the icing indicator comes on.
(a) If the LED does not come on, replace the lighted icing indicator (Ref. AMM TASK 30-81-21-000-001) and (Ref. AMM TASK 30-81-21-400-001).
(3) Set the ICE IND &/STBY COMPASS switch (2LF) to OFF.

5. Close-up
Subtask 30-81-21-942-050-A

A. Remove the access platform(s).

Subtask 30-81-21-862-050-A

B. De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 00:33:08 UTC