The Aircraft Electronics Association
tells ANN on August 6, the Federal Aviation Administration (FAA)
published in the Federal Register a final rule directed at High
Intensity Radiation Fields in all classes of aircraft.
This final rule amends FAA regulations by adding airworthiness
certification standards to protect aircraft electrical and
electronic systems from HIRF. This action was deemed necessary by
the FAA due to the vulnerability of aircraft electrical and
electronic systems and the increasing use of high-power radio
frequency transmitters.
AEA says the final rule amends the airworthiness standards for
normal, utility, acrobatic, and commuter category airplanes
certificated under Part 23; transport category airplanes
certificated under Part 25; normal category rotorcraft certificated
under Part 27; and transport category rotorcraft certificated under
Part 29.
Under the rule, applicants for certification of aircraft under
these parts are required to demonstrate that any electrical and
electronic system that performs a function whose failure would
prevent the continued safe flight and landing of the aircraft must
be designed and installed so that:
Each function is not adversely affected during and after the
time the aircraft is exposed to a specifically designated HIRF
environment (HIRF environment I);
Each electrical and electronic system automatically recovers
normal operation of that function, in a timely manner, after the
aircraft is exposed to HIRF environment I, unless this conflicts
with other operational or functional requirements of that system;
and
Each electrical and electronic system is not adversely affected
during and after the aircraft is exposed to a less severe, but more
commonly encountered HIRF environment (HIRF environment II).
These amendments become effective September 5, 2007.
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