1.8.4 Configuration deviation list (CDL)
1.8.4.1 The CDL identifies any external parts of an aircraft type which may be missing at the commencement of a flight, and which contains, where necessary, any information on associated operating limitations and performance correction. Operation of the aircraft without certain secondary airframe and engine parts could be allowed through the use of an approved CDL. The CDL should be included in the AFM as a separately approved appendix. The following guidance should be followed when preparing the CDL.
a) The parts or combinations of parts permitted to be missing, together with the associated performance penalties and other limitations should be determined and presented in the same format as the Master Minimum Equipment List (MMEL).
b) Unless it can be established that a zero or negligible performance degradation occurs as a result of a part missing from the aircraft, a performance penalty should be presented for each part or for each combination of parts.
c) Performance penalties are normally presented as mass or percent mass decrements. Equivalent penalties expressed as other parameters are also acceptable. A single performance penalty applicable to all AFM performance limitations may be presented for a missing part or, subject to certain restrictions, performance penalties may be presented for each phase of flight. Typical examples are:
1) Only a single performance penalty for take-off and a single performance penalty for landing will be permitted. For take-off, the penalty shall be the most restrictive of the take-off field length, first, second and final segment climbs, and take-off flight path considerations. For landing, the penalty shall be the most restrictive of approach climb, landing climb, and landing distance considerations.
2) Only a single mass penalty for en-route climb performance, applying to both the one-engine-inoperative and two-engine-inoperative cases, as applicable, will be permitted.
3) The CDL should contain the explanations of take-off performance penalty, landing performance penalty and en route performance penalty, as appropriate for the aircraft, when individual penalties are used.
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