PS Engineering
PMA7000B Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-780-0004 Page 2-12 Feb. 2004
17. 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.
2.11.1.1 Marker Checkout
1. Connect a ramp generator at the antenna end of the marker coax. With the unit under test in HI sensi-
tivity, verify that a 160 µV, 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 (M) push-
button has been depressed. 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. Repeat with the unit in LOW sensitivity, with 430 µVolts applied.
3. Connect the marker antenna and verify proper operation.
2.11.2 Receiver Sensitivity
Although the receiver meets FAA TSO-C35d sensitivity specifications, the sensitivity has been adjusted to
meet real world requirements (150µV and 430µV, soft). This will usually eliminate the need for the avion-
ics shop to reduce the sensitivity in the field so as to prevent early detection of the marker beacons. If your
particular installation requires more or less sensitivity, see adjustment section 2.6, and figure 2-1.
2.12 Cellular Interface Checkout
When a wireless telecommunication system is installed and the unit configured for duplex, a dial tone will
appear in the headset of the pilot when the COM 3 Xmt selector activated. In “ALL” intercom mode, a dial
tone will be heard whenever the copilot or passenger’s hook switch is closed.
2.13 Internal Recorder Checkout (Optional)
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 at least five incoming radio transmissions.
This audio should only appear in the pilot’s headset, and only be incoming transmissions from the trans-
ceiver selected in the mic select switch. Depress the panel or yoke mounted playback switch, and verify
that messages play, in the order received. Repeat for COM 2, and COM 3 (if installed).
2.14 Digital Annunciation Checkout (Optional)
If interfaced with an annunciation system, verify that all alert messages play at the appropriate time, and
that they are silenced by the “ACK” button.
2.15 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 accor-
dance 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 log book entry, FAA Form 337, weight and balance computation and other documentation as
required. 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.
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