(a) Compliance with CS 29.1145(a) is considered to be demonstrated by providing for each engine one of the following design solutions:
(1) Independent ignition controls should be provided for each ignition circuit, or
(2) A single ignition control acting on two ignition switches should be provided to control each ignition circuit via a dual-channel FADEC.
(i) Each switch should be connected to one channel of the FADEC.
(ii) The FADEC should ensure the following functions:
(A) Ability to control automatically and independently each ignition circuit of the engine
(B) Ability to perform a health monitoring of each ignition circuit for the aircraft to meet the safety objectives of CS-29
(b) The check of the health condition of each ignition circuit could be achieved in automatic or initiated test or by procedure without any difference.
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