AMC
25.812(l)(1) Transverse Separation of the Fuselage
ED Decision 2017/015/R
Within CS 25.812(l)(1), the phrase ‘in addition to the lights that are
directly damaged by the separation’ means that when calculating the percentage
of electrically illuminated emergency lights rendered inoperative by the
fuselage separation, the number of lights whose function is lost due to loss
of power or loss of control input to the lights should be divided by the total
number of electrically illuminated emergency lights installed. The lights that
are directly damaged by the fuselage separation should not be included in the
numerator of the calculation, but only those whose function is lost due to
loss of power and/or control. The denominator should be the total of all
electrically illuminated emergency lights installed.
Applicable parts of FAA AC 25.812-1A, Floor proximity emergency escape path marking, 22 May 1989 may be used.
[Amdt 25/19]
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