I 25.4 Reliability requirements
ED
Decision 2003/2/RM
(See CS 25.1309
and AMC 25.1309)
(a) The occurrence of an ATTCS system failure
or a combination of failures in the ATTCS system during the critical time
interval which –
(1) Prevents the insertion of the required
thrust or power, must be shown to be Improbable;
(2) Results in a significant loss or reduction
in thrust or power, must be shown to be Extremely Improbable.
(b) The concurrent existence of an ATTCS
system failure and an engine failure during the critical time interval must be
shown to be Extremely Improbable.
(c) The inadvertent operation of the ATTCS
system must be shown either to be Remote or to have no more than a minor
effect.
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