PS Engineering PMA7000B Spezifikationen PDF herunterladen (Seite 19)

PS Engineering

PMA7000B Series Audio Selector Panel and Intercom System

Installation and Operator’s Manual

200-780-0005 Page 2-12 Rev. 11, February 2015

13. Verify proper operation of all receiver sources by selecting them using the appropriate button. The but-

ton 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 ALL, ISO and CREW 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 equipment

on the aircraft.

2.10.2.1Marker Checkout

1. Connect a ramp generator at the antenna end of the marker coax. With the unit under test in HI sensitiv-

ity, 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 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.

2.11 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 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 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 .

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