Document ID: chunk:federal_register_of_legislation:F2025C00187:reg:5:p1
Version: federal_register_of_legislation:F2025C00187
Segment Type: reg
Provision Reference: reg 5 (pt 1/9)
Character Range: 152107–154890

5     Less than 963 hPa                           FL 130

Note   The intention is to retain a minimum buffer of 1 000 ft above the transition altitude.
       (4) An aircraft must not cruise within the transition layer.
       (5) For an operation at or below the transition altitude, an aircraft's altimeter setting must be:
(a) the current local QNH (either an accurate QNH as defined in section 10.06 or a forecast QNH) of a station along the route within 100 NM of the aircraft; or
(b) the current forecast area QNH.
Note   Under section 10.03, if an aircraft is at a known elevation, and an accurate QNH is available, then, before take-off, the pilot in command of the aircraft must check the accuracy of each of the aircraft's pressure altitude systems.
       (6) For an operation above the transition altitude, an aircraft's altimeter setting must be 1 013.2 hPa.
       (7) On climb, after passing the transition altitude, but before levelling off, an aircraft's altimeter setting must be changed from QNH to 1 013.2 hPa.
       (8) On descent, just before passing the transition layer, an aircraft's altimeter setting must be changed from 1 013.2 hPa to QNH.

11.03 Oceanic airspace
       (1) This section applies to a flight in any class of airspace that is oceanic airspace.
Note   Oceanic airspace is defined in section 11.01. At the commencement of this instrument, the AIP document specifying the geographic boundaries of oceanic control areas is the Designated Airspace Handbook.
       (1A) In this subsection:
INS means inertial navigation system.
IRS means inertial reference system.
long range navigation system, or LRNS, means a navigation system, capable of area navigation in oceanic airspace, that comprises an INS, or an IRS, or an approved GNSS position source.
       (1B) The pilot in command of an aircraft that has been declared in a flight plan as capable of navigating to a navigation specification that is RNP 2, RNP 4 or RNP 10 must, immediately before entering oceanic airspace, ensure that a check has been completed that the aircraft has at least 2 independent and operative LRNSs capable of navigating to the required navigation specification (capable LRNS).
Note   The requirements of this subsection do not override the minimum navigation system equipment requirements required by the Part 91, Part 121, Part 133 or Part 135 Manual of Standards.
       (1C) If, as a result of the check mentioned in subsection (1B), the number of capable LRNSs is less than 2, the pilot in command of the aircraft must ensure that ATS is notified of the situation as soon as practicable.
       (2) Before the departure of a flight planned to operate in oceanic airspace using GNSS, the pilot in command must obtain a prediction for GNSS FDE availability for