PS Engineering PMA7000B Installation Manual - Manual (Page 19)

PS Engineering
PMA7000B Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-780-0005 Page 2-12 Rev. 10, December 2012
pilot has radio transmit capability in Com3 duplex mode, on the selected Com ( 1 or 2). However, he
will have Com 3 capability if the copilot hook switch is grounded.
13. Verify proper operation of all receiver sources by selecting them using the appropriate button. The
button illuminates to show which source is in use.
14. Push the SPR button. Verify that all selected audio is heard in the cockpit speaker. Verify that the
audio mutes when the mic is keyed.
15. Verify that the appropriate LED in the lower right side blinks when either push to talk is keyed.
16. Verify proper Intercom system operation in the A LL , I SO and C REW modes (see Table 3-1).
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 equip-
ment on the aircraft.
2.10.2.1 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 V, 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 Volts applied.
3. Connect the marker antenna and verify proper operation.
2.10.3 Receiver Sensitivity
Although the receiver meets FAA TSO-C35d sensitivity specifications, the sensitivity has been adjusted to
meet real world requirements (150V and 430V, soft). This will usually eliminate the need for the avi-
onics 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.
2.11 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.
2.12 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 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 logbook entry, and other documentation as required such as FAA Form 337, weight and balance
computation. 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 register online at www.ps-
engineering.com/support.shtml .