AMC E 910 Relighting In Flight

(1)AMC 25.903(e)(2) contains guidance that can be used to establish the objectives of the demonstration of compliance of the Engine with CS-E 910. Active coordination between the Engine type-certificate applicant and the aircraft type-certificate applicant is recommended.

(2)Either Engine altitude testing or Engine flight testing are considered to be acceptable means of demonstrating compliance. However, other appropriate tests or evidence can be proposed by the applicant.

(3)The following specific threats should be considered in the demonstration of compliance:

(a)Rapid relight after an in-flight Engine shutdown If a functioning Engine is shut down for any reason and the pilot quickly initiates a restart command (after an initial delay of at least 5 seconds to simulate the pilot response time during an actual in-flight event), the Engine design, and in particular the Engine Control System, should not introduce any unnecessary delay in the Engine returning to the previous power or thrust setting.

(b)Rotor-lock The potential for rotor-lock and its impact on the capability of the Engine to relight in flight should be determined. Any assessment should be based upon conservative assumptions that include but are not limited to clearances (taking into account tolerances), the initial conditions, flight effects, thermal effects and the dwell time. All the Engine rotors should be considered. If a demonstration through flight test is proposed, it should represent a set of conservative operating assumptions for the Engine in terms of rotor-lock, or it should be supplemented by an analysis that satisfactorily addresses the conservative operating assumptions.

[Amdt No: E/5]