ED Decision 2022/012/R
SUITABLE AERODROMES ā SUITABLE INSTRUMENT APPROACH PROCEDURES (IAPs) ā SAĀ CATĀ I AND SAĀ CATĀ II
ICAO design criteria for IAPs are contained in PANS-OPS (DocĀ 8168), VolumeĀ II.
The design criteria for SA CAT I are the same as those used for standard CAT I approaches, except that the procedures used for SA CAT I should have an OCH based on radio altimeter height loss, since the use of a radio altimeter or other device capable of providing equivalent performance to determine the DH is prescribed.
PANS-OPS Volume II contains the following statement about OCH based on the use of a radio altimeter: āIf the radio altimeter OCA/H is promulgated, operational checks shall have confirmed the repeatability of radio altimeter information.ā To assist in assessing the suitability of the approach area for the use of a radio altimeter, aerodromes may produce a precision approach terrain chart (PATC). Such a chart is a standard requirement for CAT II/III runways. The criteria for the PATC are contained in ICAO Annex 4, which explains the function as follows: āThe chart shall provide detailed terrain profile information within a defined portion of the final approach so as to enable aircraft operating agencies to assess the effect of the terrain on DH determination by the use of radio altimeters.ā A DH of 150Ā ft is located approximately 600Ā m before the threshold on a 3o glide path.
For SA CAT I operations, the instrument approach chart should contain an OCH based on the use of a radio altimeter or other device capable of providing equivalent performance, and the information in Part C of the operations manual must contain a DH based on the use of a radio altimeter. This procedure may be titled āSA CAT Iā or āCAT Iā.
For SA CAT II, the situation is similar. The design criteria are identical to those for CAT II approaches in PANS-OPS, the only exception being the lack of some lighting systems. The OCH and DH are based on the use of a radio altimeter or other device capable of providing equivalent performance.
Since some of the lighting systems are missing, it is unlikely that a State will publish the instrument approach chart as CAT II or OTS CAT II but preferably as SA CAT II, even though the design criteria are the same. If a State, however, promulgates such an instrument approach as CAT II, it can be used for SA CAT II operations.
SA CAT II operations can be conducted on regular CAT II runways and following CAT II procedures.
SA CAT I and II approach design criteria match standard CAT I/II, except radio altimeter-based OCH/DH and missing lighting for SA CAT II. PATC charts aid terrain assessment.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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