GA1-2TP Rev C
Page 3 of 7
Scope
This document is a test plan to be used to establish that newly installed electrical equipment does
not interfere with essential aircraft equipment in any way that would impair safety of flight of the
aircraft. Satisfactory completion of this test plan confirms that the newly installed equipment satisfies
the EMI requirements of the Federal Aviation Administration. This test plan is applicable to FAR part
29 Rotorcraft.
Applicable Documents
CFR 29.1309(c), 29.1351(b)(1), 29.1351(b)(2) and AC25-10 Paragraph 5, sections: (m)(4) & (n).
Witnessing of EMI Test
This test shall be witnessed by someone who is authorized by the FAA to return the aircraft to
service. This would include an FAA licensed Avionics Technician, A&P Mechanic, Inspector of
Airworthiness, or the Repair Station’s Director of Maintenance. In addition, an FAA representative,
such as a DAR or DER may witness the test.
Equipment Under Test
The newly installed Equipment Under Test (EUT) by this test plan shall be in proper working order
throughout the test. If the EUT fails during this test, then this test shall be repeated with the EUT in
proper working order.
Test Procedure
Testing shall normally be conducted with the aircraft running on the ground, or with battery or
external ground power where appropriate. In the event that an aircraft system or component can
only be evaluated for the effects of interference with the aircraft in flight, then the evaluation of that
system or component shall be conducted with the aircraft in flight. Testing conducted with the
aircraft in flight shall be performed with safety of flight in mind and with only necessary personnel on
board.
Testing shall be conducted on the aircraft with all aircraft systems and equipment operating
normally, and cycled as necessary to conduct the test. The EUT shall be operated normally. The
EUT shall be cycled on and off. The EUT shall also be cycled through all of its operating modes.
Each aircraft system or component being evaluated for the effects of EMI will be observed as the
EUT is cycled. A transient motion or flicker is acceptable provided no permanent deviation is
established. There can be no stand-off conditions displayed on an instrument. In the case of audio
equipment being evaluated for the effects of EMI, a change in the audio (such as background noise)
that does not interfere with the intended purpose of the audio is acceptable.
For each aircraft system or component being evaluated for the effects of EMI, mark the item as
PASS or FAIL based upon the outcome of this test procedure.
If an aircraft system or component being evaluated for the effects of EMI Fails this test procedure,
then corrective action must be taken to reduce the interference to an acceptable level which allows
the aircraft system or component being evaluated for the effects of EMI to PASS this test. When re-
testing after corrective action, the only tests to be repeated are the tests that Failed previously.
Items that previously Passed do not need to be re-tested, unless the method of corrective action
results in changes to the EUT, which might cause the EUT to Fail previously Passed items. Mark
the N/A __ field on the re-test test plan for the items that previously Passed and are not being re-
tested.
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