Appendix to CS FCD.400 Compilation of DR tables
ED Decision 2021/012/R
This Appendix specifies the compilation of DR tables. The applicant conducts a detailed evaluation of the differences of the aircraft concerned and incorporates it into the DR tables.
(a) DR 1: General
The general characteristics of the candidate aircraft are compared with the base aircraft with regard to:
(1) general dimensions and aircraft design (number and type of rotors, wingspan or category);
(2) flight deck general design;
(3) cabin layout;
(4) engines (number, type, and position);
(5) limitations (flight envelope).
(b) DR 2: Systems
Consideration is given to differences in design between the candidate aircraft and the base aircraft. For this comparison the Air Transport Association (ATA) 100 index is used. This index establishes a system and subsystem classification and then an analysis performed for each index item with respect to the main architectural, functional and operations elements, including controls and indications on the systems control panel.
(c) DR 3: Manoeuvres
Operational differences encompass normal, abnormal and emergency situations and include any change in aircraft handling and flight management. It is necessary to establish a list of operational items for consideration on which an analysis of differences can be made.
The operational analysis should take the following into account:
(1) flight deck dimensions (size, cut-off angle and pilot eye height);
(2) differences in controls (design, shape, location and function);
(3) additional or altered function (flight controls) in normal or abnormal conditions;
(4) handling qualities (including inertia) in normal and in abnormal configurations;
(5) aircraft performance in specific manoeuvres;
(6) aircraft status following a failure;
(7) management (such as Electronic Centralised Aircraft Monitoring (ECAM), Engine Indication and Crew Alerting System (EICAS), navaid selection and automatic checklists).
[Issue No: FCD/2]
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