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Guidance concerning Air Navigation in and above the NAT MNPSA

CHAPTER 10

10.7.10

The NAT CMA will take follow-up action in the following circumstances:

  • a)

    when reports are received from height monitoring systems indicating that aircraft altimetry system performance may not be compliant with the airworthiness requirements. i.e. measurements which are in magnitude equal to, or greater than, the following criteria:

    • Total Vertical Error (TVE) : 110 m (300 ft);

    • Altimetry System Error (ASE) : 90 m (300 ft); or

    • Assigned Altitude Deviation (AAD) : 90 m (300 ft);

  • b)

    when reports are received from ATS Provider units, or other sources, that detail for any reason operational errors that have resulted in an aircraft being at a level 90 m (300 ft) or more from its cleared flight level. Follow–up action with the appropriate State of Registry will normally only be taken when the information contained in the reports is not sufficiently comprehensive to determine the cause of the deviation; and

  • c)

    when receiving reports from ATS Provider units of height deviations of 90 m (300 ft) or more resulting from turbulence, TCAS manoeuvres or contingency action.

10.7.11

These reports are taken into account when compiling the annual risk in RVSM Airspace and

MNPS Airspace, for the NAT Region.

Other Reports to the CMA

10.7.12

Details of the following occurrences should also be reported to the CMA by the ATS

Provider units:

a)

erosions of longitudinal separation between aircraft within MNPS Airspace, in excess of 3 minutes;

  • b)

    occasions when action is taken to prevent a GNE;

  • c)

    lateral deviations from cleared route of less than 25NM

  • d)

    discrepancies of 5 minutes or more between an ETA/ATA at a waypoint; and

  • e)

    occasions when an Operator is suspected of not being in possession of an MNPS/RVSM

approval.

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NAT Doc 007

70

Edition 2010

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