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An "Alternate Intercom Mode" is incorporated in KMA 28B. This allows the passengers and crew to con-
verse, but removes radio traffic from the passengers' headphones, and blocks passenger mics from the
crew during radio receptions.
A 3-light Marker Beacon receiver is integrated in the KMA 28B. This provides the necessary Marker
Beacon lights and audio indications necessary for an Instrument Landing System (ILS) approach.
1.4
APPROVAL BASIS -
TSO Approval.
The KMA 28B-series Audio Selector Panels is manufactured by, and the TSO approval held by PS Engi-
neering, Inc. The system is FAA approved under TSO C50c (Audio Amplifiers) and TSO C35d (Marker
Beacon Receivers), as the PMA7000 (series). In addition, they are approved by the Joint Airworthiness
Authorities under JTSO C50C and JAR-TSO 2C35d.
All systems comply with relevant portions of EUROCAE RTCA MPS WG No. 7/70, DO-143 and (Marker
Beacon Receivers), ED-14C/DO-160C (Environmental Conditions and Test Procedures for Airborne
Equipment), ED12B/DO-178B (Software Considerations for Airborne Equipment), and ED- 18/DO-214
(Audio Systems Characteristics and Minimum Operational Performance Standards for Aircraft Audio
Systems).
Operation is subject to the following conditions:
This device may not cause harmful interference.
This device must accept any interference received, including interference that may cause undesired opera-
tion.
1.5
SPECIFICATIONS
Marker Beacon:
Audio Selector/Intercom:
APPLICABLE DOCUMENTS:
ENVIRONMENTAL Qualifications:
Operating Temperature Range:
Altitude:
DIMENSIONS:
WEIGHT (With Rack & Connectors):
POWER REQUIREMENTS (Including Internal Lighting):
Voltage:
Maximum Current:
D201106000060
Bendix/King
KMA 28B Audio Selector Panel and Intercom System
Installation and Operator's Manual
TSO COMPLIANCE
C35d, Class A
C50c, Class A
RTCA/DO-214 RTCA/DO-143 RTCA/DO-160C
RTCA/DO-178B
A1D1/CA(MN)XXXXXXBBBBTBKXX
-15º C to 55ºC
Up to 50,000 feet in an non-pressurized area
Height: 1.3 in. (3.3 cm) Width: 6.25 in. (16.9 cm)
Depth: 6.8 in. (17.3 cm)
1.5 lb. (0.54 kg)
11 to 33 VDC
2.5 Amp (Externally protected by a 3A pull-type
breaker)
Page 1-2
June 2011
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