AMC 25.812(l)(1) Transverse Separation of the Fuselage

• ED Decision 2017/015/R found in: CS-25 Amdt 27 - Large Aeroplanes (Jan 2023)

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]