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1.8.4.2 The following information may be presented in the CDL appendix:
a) When the aeroplane is operated using the CDL, it must be operated in accordance with the limitations specified in the AFM, as amended in the CDL.
b) The associated limitations should be listed on a placard affixed in the cockpit in clear view of the pilot in command and other appropriate crew member(s).
c) No more than one part for any one system may be missing, unless specific combinations are indicated in the CDL. Unless otherwise specified, parts from different systems may be missing. The performance penalties are cumulative, unless specifically designated penalties are indicated for the combination of missing parts.
d) No more than three parts that have each been determined to cause a negligible performance degradation may be missing for take-off without applying a performance penalty. When more than three such parts are missing, a performance penalty of either 0·05 per cent of the maximum take-off mass or 50 kg, whichever is less, should be applied for take-off, en route, and landing for each missing part.
e) Take-off performance penalties should be applied to the take-off mass that is limited by performance considerations (i.e. take-off field length, first, second, or, final segment climb, or take-off flight path). If the performance limited take-off mass is greater than the maximum certified take-off mass, the take-off performance penalties should be applied to the maximum certified take-off mass to ensure compliance with the noise requirements.
f) Landing performance penalties should be applied to the landing mass that is limited by performance considerations (i.e. landing field length, landing climb or approach climb). If the performance limited landing mass is greater than the maximum certified landing mass, the landing performance penalties should be applied to the maximum certified landing mass to ensure compliance with the noise requirements.
g) En route performance penalties apply only to operations that are limited by the one- or two-engine (s) inoperative en route climb performance.
h) The numbering and designation of systems in the CDL appendix should be based on Air Transport Association (ATA) Specification 2200 (formerly Specification 100). The parts within each system are identified by functional description and, when necessary, by part numbers.
1.8.4.3 Accountability of performance degradation relative to both minor design changes and CDL items.
1.8.4.3.1 General. Whenever a minor change to the type design aerodynamic configuration or a CDL proposal (e.g. installation of wing tip mounted emblem lights, missing flap hinge covers, etc.), has been submitted for CAA approval, the applicable performance degradation needs to be determined. In lieu of a complete flight test analysis to determine the performance degradation, simple criteria are prescribed below for establishing an acceptable level of airworthiness for the affected items.
1.8.4.3.2 Criteria
a) Estimated Drag. The aerodynamic drag of the type design change or CDL item should be evaluated. Design changes or CDL items that have no impact on, or actually improve, the aerodynamic drag of the aircraft are considered to have no performance penalty. In cases where there are quantifiable effects on aerodynamic drag (no matter how small), the drag value should be estimated and then increased by a factor of 2, unless the estimated drag was determined with equivalent conservatism.
b) Performance Penalty. Performance penalties (usually expressed in kg or percent mass) should be determined for all appropriate performance limitations (take-off, en route and landing) based on the effects of the estimated drag. If the resulting mass penalty is less than the smaller of 0·05% of the maximum certified take-off mass or 50kg, the performance degradation may be considered negligible. The AFM supplement or CDL appendix should identify those type design changes or CDL items that result in a negligible performance degradation. If the performance degradation is not considered negligible, the appropriate performance penalty should be provided as a limitation in the AFM supplement or in the CDL appendix.
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适航手册 AIRWORTHINESS MANUAL(41)
