A. Removal of the Mechanic Call Horn
 (1)
 Hold the cover (7) of the box (6) and loosen the quick release fasteners (12) by a quarter turn.

 (2)
 Slowly open the cover (7) of the box (6).

 (3) Disconnect the power supply wires (11) at the splice with the R applicable tool (Ref. ASM 23-42/01) (Ref. ESPM 20).
 (4)
 Remove the screws (4) and remove the flat washers (5).

 (5)
 Remove the support (1) from the cover (7).

 (6)
 Loosen the nut (2).

 (7)
 Remove the horn (13) from its support (1).

 (8)
 Remove the flat washer (3) from the horn (13).

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 Mechanic Call Horn
 Figure 401/TASK 23-42-21-991-001
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 TASK 23-42-21-400-001
 Installation of the Mechanic Call Horn (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 warning notice
 No specific access platform 1.6 m (5 ft. 3 in.)

 B. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE  DESIGNATION
 -------------------------------------------------------------------------------
23-42-00-710-001 Operational Test of the Mechanic Call
 32-22-00-010-001 Nose Gear Doors - Ground Doors Opening
 32-22-00-410-001 Nose Gear Doors - Ground Doors Closing
 ESPM 20

R  ASM 23-42/01 23-42-21-991-001 Fig. 401
 3. Job Set-up
__________
 Subtask 23-42-21-860-051

 A. Aircraft Maintenance Configuration
 (1)
 Make sure that you put a warning notice in the cockpit to tell persons not to operate the landing gear.

 (2)
 Make sure that the main doors 713 and 714 of the nose landing gear well (Ref. TASK 32-22-00-010-001) are open.

 (3)
 Make sure that the access platform is in position under the nose landing gear well.

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 B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
121VU EIS/HORN/SPLY 2WC P09
 4. Procedure
_________
 (Ref. Fig. 401/TASK 23-42-21-991-001)
 Subtask 23-42-21-420-050

 A. Installation of the Mechanic Call Horn
 (1)
 Clean the component interface and/or the adjacent area.

 (2)
 Do an inspection of the component interface and/or the adjacent area.

 (3)
 Install the flat washer (3) on the horn (13).

 (4)
 Install the horn (13) on its support (1).

 (5)
 Tighten the nut (2).

 (6)
 Put the support (1) on the cover (7).

 (7)
 Put the washers (5) in position and install the screws (4).

 (8) Install the applicable contact at the end of each wire of the new R horn (Ref. ASM 23-42/01) (Ref. ESPM 20).
 (9) Connect the power supply wires (11) using the applicable tool.
 (10)
 Close the cover (7) of the box (6).

 (11)
 Hold the cover (7) of the box (6) and tighten the quick release fasteners (12) by a quarter turn.

 Subtask 23-42-21-865-052
 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 2WC
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 C. Do the operational test of the mechanic call (Cockpit-to-Ground Crew Call only) (Ref. TASK 23-42-00-710-001).
 5. Close-up
________ Subtask 23-42-21-410-050
 A. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.
　
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