AMC E 910 Relighting In Flight
ED
Decision 2018/014/R
(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]
EASA engine regulations require demonstrating reliable in-flight relighting after shutdown. Compliance can be shown through altitude or flight testing, considering rapid restarts and rotor-lock potential. Engine design should minimize restart delays, and rotor-lock assessments must use conservative assumptions. Coordination between engine and aircraft manufacturers is recommended.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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