Operational Test of the Mechanic Call

TASK 23-42-00-710-001-A
Operational Test of the Mechanic Call

WARNING: MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT. UNWANTED ELECTRICAL POWER CAN BE DANGEROUS.

WARNING: MAKE SURE THAT THERE ARE NO PERSONS IN A RADIUS OF 5 M MIN. AROUND THE NOSE LANDING GEAR. WHEN THE MECHANIC CALL HORN OPERATES, THE SOUND LEVEL IS MORE THAN 110 DB.

ZONE: 120
ZONE: 210

1. Reason for the Job
To do the call test between the cockpit and the ground.
2. Job Set-up Information
A. Work Zones and Access Panels

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

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)

3. Job Set-up
Subtask 23-42-00-861-050-A

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

Subtask 23-42-00-865-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	COM/AUDIO/ACP/F/O	5RN	G07
** ON A/C NOT FOR ALL
49VU	COM/AUDIO/ACP/CAPT	4RN	G06
** ON A/C ALL
49VU	CAPT/LOUD/SPKR	5WW	F10
49VU	FWS/FWC1/SPLY	3WW	F01
** ON A/C NOT FOR ALL
49VU	COM/ACP F/O/BITE/ INT 2 AUDIO/3&5 OCCPNT	5RN	G07
** ON A/C NOT FOR ALL
49VU	COM/ACP CAPT/SELCAL/INT 1 AUDIO/AVNCS	4RN	G06
** ON A/C ALL
121VU	COM NAV/SELCAL	8RN	M04
121VU	COM NAV/ACP/THIRD/OCCPNT	6RN	M02
121VU	EIS/HORN/SPLY	2WC	P09
121VU	EIS/F/O/LOUD/SPKR	4WW	P08
121VU	EIS/FWC2/SPLY	2WW	Q07
** ON A/C NOT FOR ALL
121VU	COM NAV/ACP/FOURTH/OCCPNT	20RN	M01

4. Procedure
Subtask 23-42-00-710-050-A

A. Cockpit to Ground Crew Call

ACTION	RESULT
1.On the panel 21VU : Push and release the CALLS/MECH pushbutton switch.	On the external power panel 108VU, the COCKPIT CALL indicator light comes on and stays on. The horn in the nose landing-gear well must operate when you push the CALLS/MECH pushbutton switch.
2.On the external power panel 108VU:	On the panel 108VU:
Push and release the RESET pushbutton switch.	The blue COCKPIT CALL indicator light goes off.

Subtask 23-42-00-710-051-A

B. Ground Crew-to-Cockpit Call

ACTION	RESULT
1.On the external power panel 108VU:
Push the COCKPIT CALL pushbutton switch.	On the ACPs, the amber MECH annunciator light flashes. You can hear the buzzer in the audio-warning loudspeakers (the buzzer operates as long as you push the COCKPIT CALL pushbutton switch).
2.On the ACP :
Push the RESET pushbutton switch.	On the ACPs, the amber MECH annunciator light goes off. NOTE: You must push the RESET pushbutton switch less than one minute after the call. If not, the MECH annunciator lights go off automatically.

5. Close-up
Subtask 23-42-00-862-050-A

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

[Rev.10 from 2021] 2026.03.31 23:14:54 UTC