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An aircraft equipped with RNAV 1 navigation specifications is cleared by the ATC to execute a Standard Instrument Departure (SID) that requires RNP 1 equipment. The pilot is not qualified for RNP 1 procedures, and the aircraft is not equipped with RNP 1. What should the pilot do?
  • A
    He/she shall accept the SID, since the requirement for lateral accuracy is assured.
  • B

    Advise ATC, that he/she is UNABLE to comply and should request a different SID.

  • C
    He/she shall accept the SID and monitor system performance during departure.
  • D
    He/she should first check the integrity of the system and then advise ATC accordingly.

ICAO Annex 6
Chapter 1. DEFINITIONS
Navigation specification - A set of aircraft and flight crew requirements needed to support performance-based navigation operations within a defined airspace. There are two kinds of navigation specifications:

  • Required navigation performance (RNP) specification. A navigation specification based on area navigation that includes the requirement for performance monitoring and alerting, designated by the prefix RNP, e.g. RNP 4, RNP APCH.
  • Area navigation (RNAV) specification. A navigation specification based on area navigation that does not include the requirement for performance monitoring and alerting, designated by the prefix RNAV, e.g. RNAV 5, RNAV 1.

ICAO Doc 8168
Chapter 1 GENERAL REQUIREMENTS
1.3.6 PBN operational approval

1.3.6.1 Pilots shall verify, before operating on any PBN route or procedure, that they have approval to operate on the navigation specification(s) used in the design of the procedure. Where there are additional restrictions, for example, sensor use or optional functionality as discussed in 1.3.2, the pilot shall also verify that these restrictions are complied with.

RNAV 1 and RNP 1 are two different navigation specifications. The aircraft is unable to execute a Standard Instrument Departure (SID) that requires RNP 1 navigation specification if it is not equipped and qualified for RNP 1.

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