AMC 25.1403 Wing icing detection lights
ED Decision 2016/010/R
Unless operations at night in icing conditions are prohibited by an
operating limitation, CS 25.1403
requires that a means be provided, during flight at night, to illuminate or
otherwise determine ice formation on parts of the wings that are critical from
the standpoint of ice accumulations resulting from Appendix C and
Appendix O icing conditions. For showing compliance with the CS-25
certification specifications relative to SLD icing conditions represented by
Appendix O, the applicant may use a comparative analysis. AMC 25.1420(f)
provides guidance for comparative analysis.
a. If the
flight crew cannot see the wings, one acceptable means of compliance with this
regulation would be to install an ice evidence probe in a position where the
flight crew can observe ice accumulation. The applicant should substantiate
that formation of ice on this device precedes formation of ice on the wings or
occurs simultaneously with it. Consideration should be given to the need for
illuminating the ice evidence probe.
b. Wing
icing detection lights should be evaluated both in and out of clouds during
night flight to determine that the component of interest is adequately
illuminated without excessive glare, reflections, or other distractions to the
flight crew. These tests may be accomplished during the aeroplane
certification flight tests. Typically, aeroplane-mounted illumination has been
used to comply with this regulation. Use of a hand-held flashlight has not
been considered acceptable because of the associated workload. The appropriate
manual should identify the ice characteristics which the flight crew is
expected to observe as well as the action the flight crew must perform if such
ice is observed.
[Amdt 25/16]
[Amdt 25/18]
For large airplanes, ensure a method exists to detect wing ice formation at night, especially under icing conditions. This can be achieved through wing illumination or ice probes visible to the flight crew. The system must provide clear ice detection without causing distractions, and flight manuals should detail ice characteristics and required crew actions.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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