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KA 44B ENVIRONMENTAL PERFORMANCE
The KA 44B ADF Antenna (071-1234-XX) is certified to TSO C41c with RTCA DO-160A
environmentals per B2D2/A/LJY/XXXXXX/ABABA.
Recent "not-for-certification-credit" testing has been performed on this antenna to
determine expected performance in selected DO-160D environmental conditions.
DO-160D Section 20 (RF Susceptibility) Tests
A KA 44B production test sample was subjected to Category TT fields as defined in the
test environment called out in RTCA DO-160D Section 20 (Change No. 1). This unit was
tested in conjunction with the KTR 2280 Multi-Mode Digital Radio. All conducted and
radiated susceptibility performance requirements were passed except for radiated
susceptibility in the band of interference frequencies between 277 MHz and 339 MHz.
Within this band the KA 44B could not tolerate interference levels greater than 0.8 V/m
(for acceptable audio signal-to-noise) or greater than 1.1 V/m (for acceptable bearing
error).
A KA 44B production test sample was subjected to the 100 V/M (and greater) HIRF levels
expected for aircraft system level certification. This test was done in a manner consistent
with aircraft system level HIRF certification testing. No permanent damage was noted
during the HIRF exposure and the unit returned immediately to normal operation after the
HIRF event terminated.
DO-160D Section 22 (Lightning Induced Transient Susceptibility) Tests
A KA 44B production test sample was subjected to Category A3J33 as defined and in the
test environment called out in RTCA DO-160D Section 22 (Change No. 3). The KA 44B
passed all requirements.
DO-160D Section 23 (Lightning Direct Effects) Tests
A KA 44B production test sample was subjected to Category 2A as defined in the test
environment called out in RTCA DO-160D Section 23. The KA 44B passed all
requirements.
Other DO-160D based test data has been collected and is available on request from
Honeywell.
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