PS Engineering
PMA450B Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-450-0600
Page 2-16
Rev. 5, August 2020
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.
2.12.3 Marker Checkout (050-450--0601 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 (
). Repeat with the unit in HIGH sensitivity, 160
V with
applied.
3.
Connect the marker antenna and verify proper operation.
2.12.4 Bluetooth Checkout
Verify that the PMA450B will “pair” with a Bluetooth device, and interface with cellular phone and Music
source. See
2.12.4.1 TEL Checkout
Pair the PMA450B with a Bluetooth telephone device. Verify that the pilot headset is connected to the cellular
telephone system (if installed). Verify that by using the pilot side PTT, the pilot can transmit on the other
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.
2.12.5 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 (top) Com receiver pushbutton (C1 or C2) that corresponds to the selected radio transmitter and
hold
for approximately one second until you hear audio playing, then release. This action will then auto-
matically play back the last recorded message. Holding down the top C1 or C2 button will stop the play-
back.
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, if
installed (J2 pin 22), and verify that messages play, in the order received. Repeat for the other COMs. 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.
Final Inspection
Verify that the wiring is bundled away from all controls and no part of the installation interferes with aircraft
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 accordance 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.
