Chapter 2.1

Transcript

1. 2.1 Category II 2.2 Category III 2.3 Decision Height and Alert Height 2.4 Runway Visual Range 2.5 Fail-passive Autoland System 2.6 Fail-operational Autoland System 2.7 Minimum Approach Break-off Height 2.8 Concept of Minima Module 2 - General Concepts
2. This Module addresses some essential definitions and concepts for CAT II or III operations. The definitions are taken from ICAO, FAA, or JAA documents and are presented in a separate way when necessary. General Information
3. The category II is a precision approach corresponding to weather minima as mentioned here below. CAT II Definitions
4. A category II approach is a precision instrument approach and landing with decision height lower than 60 m (200 ft) but not less than 30 m (100 ft), and a runway visual range not less than 350 m (1200 ft). ICAO CAT II Definitions
5. A category II approach is a precision instrument approach and landing with decision height lower than 200 ft (60 m) but not lower than 100 ft (30 m), and a runway visual range less than 2400 ft (800 m) but not less than 1200 ft (350 m). FAA CAT II Definitions
6. A category II approach is a precision instrument approach and landing with decision height lower than 200 ft (60 m) but not lower than 100 ft (30 m), and a runway visual range not less than 300 m (1000 ft). The three definitions refer to the concepts of Decision Height (DH) and Runway Visual Range (RVR), which will be explained later in this Module. It is worth noting the difference between CAT II definitions by ICAO and FAA, and the definition by JAA of the minimum runway visual range (not less than 350 m for ICAO and FAA but not less 300m for JAA). JAA CAT II Definitions
7. The main objective of CAT II operations is to provide a level of safety equivalent to other operations, but in more adverse weather conditions and lower visibility. The desired level of safety is achieved through: • Airborne equipment, • Non-visual aids (ILS facility), • Visual aids (runway marks, lighting systems), • Flight crew training, CAT II Objective
8. • Flight crew procedures, • ATC procedures, • Aircraft maintenance, • Airfield maintenance, • Criteria for obstacle clearance. CAT II Objective
9. CAT II weather minima has been established to provide sufficient visual references at DH to permit a manual landing (or a missed approach) to be executed (it does not mean that the landing must be made manually). CAT II Objective