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 (3)  S 214-006Make sure there is a sufficient quantity of paper in the ACARS printer.
 (4)  S 864-007Supply electrical power (Ref 24-22-00/201).
 (5)  S 864-008Remove the DO-NOT-CLOSE tags and close these circuit breakers: (a) P18 Load Control Center 1) AC ACARS PRINTER
 (6)  S 714-012Do a test of the ACARS printer operation: (a) Push and hold the TEST switch on the front of the ACARS printer. (b) Make sure that the printer makes a test print.
 (7)  S 864-010Remove electrical power (Ref 24-22-00/201).

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A
737-300/400/500MAINTENANCE MANUAL
 ACARS MANAGEMENT UNIT - REMOVAL/INSTALLATION
____________________________________________
 1.  General_______
 A.  There are two tasks in this procedure. The first task is the removal of the ACARS Management Unit (MU). The second task is the installation of the ACARS MU. The installation task refers to the ACARS operational test.
 B.  The ACARS MU is installed on the E2-1 shelf in the electrical/electronics compartment.
 TASK 23-27-32-004-009
 2.  ACARS Management Unit Removal_____________________________
 A.  References
 (1)  20-10-07/201, E/E Rack-Mounted Components
 B.  Access
 (1)  Location Zones
 205 Electrical/Electronics Compartment

 C.  Procedure
 S 864-002
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P18 Load Control Center
 1) AC ACARS MU
 2) DC ACARS MU

 S 024-003
 (2)  Remove the ACARS MU (AMM 20-10-07/201).
 TASK 23-27-32-404-004
 3.  ACARS Management Unit Installation__________________________________
 A.  References
 (1)  
20-10-07/201, E/E Rack-Mounted Components

 (2)  
23-27-00/501, ACARS Adjustment/Test

 B.  Access
 (1)  Location Zones
 205 Electrical/Electronics Compartment

 C.  Procedure
 S 864-008
 (1)  Make sure these circuit breakers are open:
 (a)  P18 Load Control Center
 1) AC ACARS MU
 2) DC ACARS MU

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 (2)  S 424-005Install the ACARS MU (AMM 20-10-07/201).
 (3)  S 864-006Remove the DO-NOT-CLOSE tags and close these circuit breakers: (a) P18 Load Control Center 1) AC ACARS MU 2) DC ACARS MU
 (4)  S 714-007Do this task: "Operational Test - Aircraft Communications Addressing and Reporting System" (AMM 23-27-00/501).

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 1.

2.

3.

A
737-300/400/500MAINTENANCE MANUAL
 SELCAL SYSTEM - DESCRIPTION AND OPERATION
_________________________________________
General
_______
 A.  The dual SELCAL (selective calling) system allows a ground station, with tone transmitting equipment, to call a specific airplane. When the correct tone combination is received, the airplane SELCAL decoder unit signals the flight crew by a SELCAL light and an electronic chime. The SELCAL system eliminates the necessity of continuous monitoring of the communication systems by the flight crew.
 B.  The SELCAL system consists of a dual SELCAL decoder unit and a control panel. The component locations are shown on figure 1. The electronic chime is part of the aural warning system (Ref 31-26-00).
　
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