Installation of the Loudspeakers

TASK 31-53-21-400-001-A
Installation of the Loudspeakers

ZONE: 210
FIN: 7WW
FIN: 8WW

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD

B. Referenced Information

REFERENCE	DESIGNATION
TASK 31-50-00-710-002-A	Operational Test of the Flight Warning Computer (FWC)
Loudspeaker

3. Job Set-up
Subtask 31-53-21-865-051-A

A. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	CAPT/LOUD/SPKR	5WW	F10
121VU	EIS/F/O/LOUD/SPKR	4WW	P08

4. Procedure
Subtask 31-53-21-420-050-A

A. Installation of the Loudspeakers
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the blanking caps from the connectors (1) and (2).
(4) Make sure that the connectors (1) and (2) are in the correct condition.
(5) Connect the connector (1) to the receptacle (2).
(6) Install the loudspeaker (4) in its housing (5). Hold the loudspeaker in position.
(7) Tighten the four locking screws (3).
(8) FOR [7WW] (LOUD SPEAKER-CAPT)
Install the thermoformed cover on the left instrument panel.
(9) FOR [8WW] (LOUD SPEAKER-F/O)
Install the thermoformed cover on the right instrument panel.

Subtask 31-53-21-865-052-A

B. 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: 7WW (LOUD SPEAKERCAPT)
49VU	CAPT/LOUD/SPKR	5WW	F10
FOR FIN: 8WW (LOUD SPEAKERF/O)
121VU	EIS/F/O/LOUD/SPKR	4WW	P08

Subtask 31-53-21-710-051-A

C. Do the operational test of the Flight Warning Computer (FWC) (Ref. AMM TASK 31-50-00-710-002)

5. Close-up
Subtask 31-53-21-860-050-A

A. Make sure that the work area is clean and clear of tools and other items.

[Rev.10 from 2021] 2026.04.01 00:37:25 UTC