PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-450-0000
Page 2-13
Rev. 6, Dec. 2015
15. Verify proper Intercom system operation in the
A
LL
, I
SO
and
C
REW
modes (see Table 3-1).
16. Verify that the audio selector panel system does not adversely affect any other aircraft system by sys-
tematically switching the unit on and off, while monitoring the other avionics and electrical equipment
on the aircraft.
2.11.3 Marker Checkout (050-450-0100, only)
1. Connect a ramp generator at the antenna end of the marker coax. With the unit under test, verify that a
430
Volt, modulated 95% with 1300 Hz, signal will illuminate the amber (M) marker light, and that
marker audio is present in the headphones when the Marker Audio (MKR) push-button has been de-
pressed. Select SPR for speaker to verify marker audio availability on the cabin speaker. Verify that
the white (I) and blue (O) lights will illuminate within
3dB of the amber lamp, with 3000 HZ and
400 Hz applied, respectively.
2. Put unit in High Marker sensitivity (
See §3.7
). Repeat with the unit in HIGH sensitivity, 160
V with
applied.
3. Connect the marker antenna and verify proper operation.
2.11.4 Bluetooth Checkout
Verify that the PMA450 will “pair” with a Bluetooth device, and interface with cellular phone and Music
source. See section 3.12 for more information.
2.11.4.1 TEL Checkout
Pair the PMA450 with a Bluetooth telephone device. Verify that the pilot headset is connected to the cellu-
lar telephone system (if installed). Verify that by using the pilot side PTT, the pilot can transmit on the oth-
er selected radio (Com 1 or Com 2). The telephone function will allow any person heard by the pilot on the
intercom, also heard on the telephone.
2.11.5 Internal Recorder Checkout
With headset plugged into pilot’s side jacks, tune COM 1 to local frequency, such as FSS or ATC ground.
Select Com 1 on mic selector switch, and record several incoming radio transmissions.
Press the Com receiver pushbutton (C1 or C2) that corresponds to the selected radio transmitter and
hold
for approximately one second. This action will then automatically play back the last recorded message.
The appropriate line-select buttons can be used to stop, skip or beack up playback.
This audio should appear in the pilot and copilot headsets, and only be incoming transmissions from the
transceiver selected in the mic select switch. Depress the audio panel or yoke mounted playback switch,
and verify that messages play, in the order received. Repeat for other COM. The playback will be stopped
by audio on the selected com. The message can be replayed from the beginning, and audio received during
the playback will not be stored.
2.12 Final Inspection
Verify that the wiring is bundled away from all controls and no part of the installation interferes with air-
craft control operation. Move all controls through their full range while examining the installation to see
that no mechanical interference exists. Verify that the cables are secured to the aircraft structure in accord-
ance with good practices, with adequate strain relief. Ensure that there are no kinks or sharp bends in the
cables and coaxial cables. Verify that the cables are not exposed to any sharp edges or rough surfaces, and
that all contact points are protected from abrasion.
Complete documentation that may be required, such as a logbook entry, weight and balance computation
and FAA Form 337. Sample text for FAA Form 337, and instructions for continuing airworthiness can be
found in Appendix F. Return completed warranty registration application to PS Engineering, or complete
online at www.ps-engineering.com.