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Conduct a test announcement from station 1 over
3. Turn the METER TEST switch to position 3 to
circuit 6MC. The circuit 6MC busy signal light should
test the power amplifier A output as the various
illuminate at all stations, and the announcement should
alarm test switches are energized.
be heard over the 6MC loudspeaker(s) only.
4. Hold the CHEMICAL test switch in the ON
position. The meter reading should be 02 dB.
ALARM CONTACT MAKER TEST.-- When
Release the switch.
conducting a test of the alarm contact makers, you must
monitor all the microphone stations and at least one
5. Hold the COLLISION test switch in the ON
loudspeaker in each loudspeaker group and any visual
position. The meter reading should fluctuate.
alarm indicators. Test the alarm contact makers in order,
Release the switch.
beginning with the lowest priority alarm first. The
6. Operate the GENERAL test switch momentarily
following procedure is for testing the general, chemical,
in the ON position. The meter reading should
and collision alarm contact makers only:
fluctuate for approximately 15 seconds. Release
1. Operate the general alarm contact maker
the switch.
momentarily to the ON position. The alarm should
7. Hold the UNASSIGNED test switch in the ON
sound for approximately 15 seconds.
position. The meter reading should fluctuate.
2. While the general alarm is sounding, operate the
Release the switch,
chemical alarm contact maker to the ON position and
8. Hold the FLIGHT CRASH test switch in the ON
hold it there. The chemical alarm should override the
position. The meter reading should fluctuate.
general alarm.
Release the switch.
3. While the chemical alarm is sounding, operate
This completes the testing of channel A and
the collision alarm contact maker to the ON position.
oscillator group 1. To test charnel B and oscillator group
The collision alarm should override the chemical alarm.
2, turn the AMPLIFIER CHANNEL SELECTOR
4. Return the chemical and collision alarm contact
switch to the 1MC-A/6MC-A position and the
makers to the OFF position.
OSCILLATOR GROUP SELECTOR switch to the NO.
1 position. Turn the METER TEST switch to position 4,
Operation of any alarm should light up the busy
and repeat steps 4 through 8.
signal lights and all visual alarm indicators of circuit
1MC and circuit 6MC. As each alarm contact maker is
Remote Testing
operated, the corresponding alarm should be heard over
all the circuit 1MC loudspeaker groups.
Remote testing consists of a test of the entire system.
The test will include testing for proper operation of the
MAINTENANCE
system from the microphone control stations and the
alarm contact makers. Figure 7-24 illustrates the proper
Maintenance of the system consists of routine
switch positions on the control rack for remote testing.
preventive maintenance and corrective maintenance.
MICROPHONE  CONTROL  STATION
Preventive Maintenance
TEST.-- When conducting a test of a microphone
control station, you must monitor all the other
Routine preventive maintenance of the system will
microphone stations and at least one loudspeaker in each
be accomplished according to the maintenance
loudspeaker group. Make several test announcements
requirement cards (MRCs) for the system, In most
over circuit 1 MC, selecting a different loudspeaker
cases, this will consist of cleaning the interior and
group for each transmission. The volume indicators
exterior of each rack, a visual inspection of equipment
should fluctuate at all stations, and the circuit 1 MC busy
components and wiring, checking for loose connections,
signal light should illuminate when each test
and testing the power amplifier tubes.
announcement is made. Each test should be heard on the
loudspeaker of the loudspeaker group selected and not
Corrective Maintenance
on loudspeakers of any other loudspeaker group. Check
the priority feature of microphone station 1 by
depressing the press-to-talk switch at station 1 while
Corrective maintenance of the system consists of
making an announcement from another station. This
troubleshooting and actual replacement of defective
parts. When performing corrective maintenance, you
should cut off the other station.
7-20

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