AWO.B.CATII.101 CS AWO.B.CATII.101 Applicability

An xLS (as defined in CS AWO.B.CATI.102) which has outputs that indicate the magnitude and sense of deviation from a preset azimuth and elevation angle giving operational characteristics equivalent to those of a conventional ILS is considered a precision approach system.

An aeroplane with a basic airworthiness approval for IFR operations is eligible to perform xLS precision approaches down to a DH of 60 m (200 ft), assuming that the necessary xLS receiver(s) and instruments and their installation have been approved. The purpose of Subpart B Section 3 is to specify the supplementary airworthiness requirements for the performance of xLS approaches with DHs below 60 m (200 ft) down to 30 m (100 ft). Depending upon the applicable operational regulations, aeroplanes that are certified in accordance with this Section may also be eligible to conduct SA CAT II operations.

Terminology

(a)The term ‘approach system’ used here refers only to the airborne system. It includes the equipment listed in CS AWO.B.CATII.111, and all related sensors, instruments and power supplies.

(b)‘Decision height (DH)’ is the wheel height above the runway elevation by which a go-around must be initiated unless adequate visual reference has been established and the aircraft position and approach path have been visually assessed as satisfactory to continue the approach and landing safely. Where ‘DH’ is used in Section 3, it means the minimum DH for which compliance with the requirements of Section 3 has been demonstrated.

(c)A ‘go-around’ is the transition from an approach to a stabilised climb.

(d)‘Failure condition’ and the terms describing the probabilities and effects of failure conditions are defined in AMC 25.1309.

The term ‘localiser’ and ‘glide path’ have been retained for use with either ILS, MLS or GLS.

Cross reference is made in this Section to AMC AWO.A.ALS.110 which provides guidance on controls, indicators and alerts associated with installations incorporating more than one type of approach system (e.g. ILS and MLS and/or GLS).

[Issue: CS-AWO/2]