PS Engineering PMA7000CD Installation Manual - Manual (Page 20)

PS Engineering
PMA7000CD- Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-790-0010 Page 2-12 Revision 10, September 2005
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 au-
dio 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 equipment
on the aircraft.
2.11.2.1 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 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.
2.11.3 Receiver Sensitivity
Although the PMA7000M meets FAA TSO-C35d sensitivity specifications, the sensitivity of the receiver
has been adjusted to meet real world requirements (150
µV and 430µV, soft). This will usually eliminate
the need for the avionics 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 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).
2.13 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,
or online at www.ps-engineering.com/warranty.shtml.