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757 MAINTENANCE MANUAL
SELCAL SYSTEM - ADJUSTMENT/TEST
_______________________________
1. General
A. This procedure contains one task. This task is the system test of the SELCAL system.
TASK 23-21-00-735-001
2. System Test - SELCAL System
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A. General
(1)
This test makes sure the SELCAL system operates correctly.
(2)
Use only approved test frequencies for this test.
B. References
(1)
AMM 23-11-00/501, HF Communications System
(2)
AMM 23-12-00/501, VHF Communications System
(3)
AMM 23-42-00/501, Cabin Interphone System
(4)
AMM 23-51-00/501, Flight Interphone System
(5)
AMM 24-22-00/201, Electrical Power - Control
(6)
AMM 31-51-00/501, Warning System
C. Equipment
(1) Encoder
(a)
CTS-700 Ramp Test Set (PN: 10000005-01 or 10000005-02) Avtech Corporation 3400 Wallingford Ave N Seattle, WA 98013
(b)
N1304A Encoder - SELCAL Ground Equipment Motorola Inc 1000 Mittel Drive Wood Dale, IL 60191
NOTE: This encoder is used with HF and VHF transmitters as
____ part of a SELCAL ground station.
D. Access
(1) Location Zones
211/212 Flight Compartment
E. Prepare for Test
S 865-002
(1)
Supply electrical power (AMM 24-22-00/201).
S 715-048
(2)
Make sure these items are serviceable:
(a)
AIRPLANES WITH HF COMMUNICATIONS SYSTEMS; HF communications system (AMM 23-11-00/501).
(b)
VHF communications system (AMM 23-12-00/501).
(c)
Pilots' call panel (AMM 23-42-00/501).
(d)
Captain's audio selector panel (AMM 23-51-00/501).
(e)
Aural warning system (AMM 31-51-00/501).
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757 MAINTENANCE MANUAL
S 865-003
(3) Make sure this circuit breaker on the overhead circuit breaker panel, P11, is closed:
(a) 11G3, SELCAL
S 865-004
(4) Connect the headset/boom mic to the captain's auxiliary
instrument-panel P13.
F. Procedure
S 715-087
(1) Do a check of the SELCAL system to make sure you receive signals from the VHF-L system:
(a)
Make the applicable selections and settings on the captain's audio-selector panel, on the pilots' aft control-stand P8: 1) Push the VHF-L microphone selector switch. 2) Adjust the VHF-L volume control knob to approximately the
12 o'clock position. 3) Set the BOOM/OXY (or the BOOM/MASK) switch to the BOOM position.
(b)
Find an appropriate test frequency. Use the VHF-L system to have the airplane assigned SELCAL-code transmitted from the ground station over the VHF-L communications.
NOTE: If the transmitting station is not available, make a
____ SELCAL coded transmission with the SELCAL encoder. Make sure the transmissions are approved.
(c)
Make sure the indications that follow occur: 1) The VHF-L switchlight on the pilots' call panel (P5) comes
on. 2) Make sure you hear a chime in the flight compartment.
(d)
Push the VHF-L switchlight on the pilots' call panel.
(e)
Make sure the VHF-L switchlight goes off.
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757
MAINTENANCE MANUAL
