AMCÂ 25.1326 Flight instrument external probes heating systems
alert
ED
Decision 2015/008/R
CSÂ 25.1326
requires that if a flight instrument external probe heating system is
installed, an alert must be provided to the flight crew when the flight
instrument external probes heating system is not operating or not functioning
normally.
It is expected that probe heating system failures are indicated to the
flight crew if such failures have an impact on the performance of the heating
system to the extent of having an “effect on operational capability or safety”
(see CSÂ 25.1309).
In accordance with CSÂ 25.1309(c) and CSÂ 25.1322(b), a
Caution category of alert is required by CSÂ 25.1326 for
immediate crew awareness and subsequent crew action.
It should be assumed that icing conditions exist during the failure
event. The decision to provide heating system failure indication should not be
based on the numerical probability of the failure event. If the failure could
potentially have hazardous or catastrophic consequences, then this failure
must be indicated.
The reliability of the system performing the probe heating system
failure detection and alerting should be consistent with the safety effect
induced by the failure. Refer to AMCÂ 25.1309,
chapter 9(c) for more detailed guidance.
[Amdt No:
25/16]
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