AMC1 NCO.IDE.A.195(b) Navigation
equipment
ED
Decision 2022/012/R
APPROPRIATE
CONTINGENCY ACTION
An
appropriate contingency action is an alternative offered in NCO.IDE.A.195(b) to completion of the planned
flight to a safe landing, either at the planned destination or a destination
alternate, using normal procedures and using navigation equipment meeting the
requirements of NCO.IDE.A.100, installed for redundancy or as a backup.
The
contingency action should be considered before flight and take into account
the information identified by flight preparation according to NCO.OP.135. It may depend on the flight and
availability of navigation solutions (satellites, ground navaids, etc.) and
weather conditions (IMC, VMC) along the flight.
The
contingency action addresses partial loss of navigation capability. An
appropriate contingency action to meet the requirements of NCO.IDE.A.195(b) does not rely on the performance of
any function of the item of equipment whose potential failure is being
considered. For example, in considering the failure of a VOR/LOC/DME receiver,
none of the functions of that receiver should be relied upon in the contingency
action.
Examples
of contingency actions include:
—
seeking
navigational assistance from ATS, using communication, navigation and
surveillance systems that remain operational, to enable a safe instrument
approach or a safe descent to VMC;
—
unusually
long periods of dead reckoning.
A
contingency action is required such that the failure of one item of navigation
equipment has a reasonable likelihood of a safe outcome to the flight,
consistent with other risks to which the operation is exposed.
EASA regulations require pilots to plan for navigation equipment failure. Contingency plans must ensure a safe landing using alternative navigation methods, considering available solutions and weather. These plans cannot rely on the failing equipment's functions and should include options like ATS assistance or dead reckoning.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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