Removal of the Mechanic Call Horn

TASK 23-42-21-000-001-A
Removal of the Mechanic Call Horn

ZONE: 120
ZONE: 700
FIN: 15WC

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 2M (6 FT) - ADJUSTABLE
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
120	AVIONICS COMPARTMENT
700	LANDING GEAR AND LANDING GEAR DOORS

C. Referenced Information

REFERENCE	DESIGNATION
TASK 32-22-00-010-001-A	Nose Gear Doors - Ground Doors Opening
ESPM 2043130
ESPM 2048250
ASM 234201
AWM 234202
Mechanic Call Horn

3. Job Set-up
Subtask 23-42-21-860-050-A

A. Make sure that you put a WARNING NOTICE(S) in the cockpit to tell persons not to operate the landing gear.

Subtask 23-42-21-010-050-A

B. Get Access
(1) Open the main doors 713 and 714 of the nose landing gear well (Ref. AMM TASK 32-22-00-010-001).
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position under the nose landing gear well.

Subtask 23-42-21-865-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	EIS/HORN/SPLY	2WC	P09

4. Procedure
Subtask 23-42-21-020-050-B

A. Removal of the Mechanic Call Horn
(1) Loosen the three quick-release fasteners (1).
(2) Slowly open the cover (2) of the box (3).
(3) Disconnect the power supply wires (4) at the splice with the applicable tool ASM 234201 AWM 234202 ESPM 2048250 ESPM 2043130.
(4) Remove the four screws (5) and washers (6) that attach the support (12) to the cover (2) with the four captive nuts (7).
(5) Remove the three screws (8) and washers (9) that attach the mechanic call horn (11) to the support (12) with the three captive nuts (10).
(6) Remove the mechanic call horn (11) from its support (12).

[Rev.10 from 2021] 2026.04.05 10:34:37 UTC