GM1
CAT.POL.A.255(a)(2) Approval of reduced required landing distance operations
ED Decision 2021/005/R
AEROPLANE ELIGIBILITY
The factors required by CAT.POL.A.230(a)(1) or (a)(2), as applicable, provide an operational safety margin to take into account landing distance operational variability in normal operations compared to the conditions and procedures set out to determine the actual landing distances during the certification of the aeroplane. The reduction of this margin, allowed when operating with reduced required landing distance, is based on a set of mitigating conditions required by CAT.POL.A.255.
However, if the factors required by CAT.POL.A.230(a)(1) or (a)(2), as applicable, have been used during the certification of the aeroplane to demonstrate compliance with certification standards such as, but not limited to, CS 25.1309 or equivalent, the aeroplane is not eligible for a reduction of the margin provided by those factors.
Furthermore, certification methods offer different options for the determination of the air distance portion of the landing distance in terms of assumption that can be made for parameters such as, but not limited to, glide path angle and sink rate at touchdown. The assumptions made during the certification of the aeroplane may increase the landing distance operational variability in normal operations. The effect of parameters such as temperature or runway slope, when these were not considered during certification, may as well increase the landing distances achievable in normal operations. Overall, the set of assumptions made during the certification of the aeroplane may not be always compatible with the operational safety margin reduction allowed in reduced required landing distance operations under CAT.POL.A.255.
Whether the factors required by CAT.POL.A.230(a)(1) or (a)(2), as applicable, have been used to demonstrate compliance with certification standards, or the set of assumptions made to determine actual landing distances during the certification of the aeroplane are compatible with reduced landing distance operations, may be only declared by the aeroplane manufacturer or by the TC/STC holder.
Reduced landing distance operations require specific aircraft eligibility. Airplanes whose certification relied on safety margins for landing distance calculations, or used assumptions incompatible with reduced margins, are ineligible. Aircraft manufacturers or certificate holders must declare compatibility for reduced landing distance approval, ensuring operational safety.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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