FAA Advisory Circular 43.13-1B
Acceptable Methods, Techniques, and Practices
Aircraft Inspection and Repair
AC 43.13-1B | 11. Aircraft Electrical Systems | 8. Wiring Installation Inspection Requirements | 11-108. Identification Stencils and Placards On Electrical Equipment
AC 43.13-1B CHG 1
9/27/01
c. All associated electrically operated
equipment and systems on the airplane must
be on and operating before conducting inter-
ference tests, unless otherwise specified.
d. The effects on interference must be
evaluated as follows:
(1) The equipment shall not be the
source of harmful conducted or radiated inter-
ference or adversely affect other equipment or
systems installed in the airplane.
(2) With the equipment energized on
the ground, individually operate other electri-
cally operated equipment and systems on the
airplane to determine that no significant con-
ducted or radiated interference exists. Evalu-
ate all reasonable combinations of control set-
tings and operating modes. Operate communi-
cation and navigation equipment on at least
one low, high and mid-band frequency. Make
note of systems or modes of operation that
should also be evaluated during flight.
(3) For airplane equipment and systems
that can be checked only in flight, determine
that no operationally significant conducted or
radiated interference exists. Evaluate all rea-
sonable combinations of control settings and
operating modes. Operate communications
and navigation equipment on at least one low,
high and mid-band frequency.
the equipment manufacturer should
design for all installation environ-
ments. The installing facility will be
responsible for resolving any incom-
patibility between this equipment and
previously installed equipment in the
airplane. The various factors con-
tributing to the incompatibility should
be considered.
NOTE: Ground EMI test have consis-
tently been found adequate for fol-
low-on approvals of like or identical
equipment types, irrespective of the
airplane model used for the initial ap-
proval. Radio frequency transmission
devices, such as wireless telephones,
must also be tested with respect to
their transmission frequencies and
harmonics.
11-108. IDENTIFICATION STENCILS
AND PLACARDS ON ELECTRICAL
EQUIPMENT. Replace worn stencils and
missing placards.
11-109.11-114. [RESERVED.]
NOTE: Electromagnetic compatibil-
ity problems which develop after in-
stallation of this equipment may result
from such factors as design charac-
teristics of previously installed systems
or equipment, and the physical in-
stallation itself. It is not intended that
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