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.  ‘Category I (CAT I) approach operation’ means a precision instrument approach and landing using an instrument landing system (ILS), microwave landing system (MLS), GLS (ground-based augmented global navigation satellite system (GNSS/GBAS) landing system), precision approach radar (PAR) or GNSS using a satellite-based augmentation system (SBAS) with a decision height (DH) not lower than 200 ft and with a runway visual range (RVR) not less than 550 m for aeroplanes and 500 m for helicopters.
.  ‘Category II (CAT II) operation’ means a precision instrument approach and landing operation using ILS or MLS with:
(a)  
DH below 200 ft but not lower than 100 ft; and

(b)  
RVR of not less than 300 m.

.  ‘Category IIIA (CAT IIIA) operation’ means a precision instrument approach and landing operation using ILS or MLS with:
(a)  
DH lower than 100 ft; and

(b)  
RVR not less than 200 m.

.  ‘Category IIIB (CAT IIIB) operation’ means a precision instrument approach and landing operation using ILS or MLS with:
(a)  DH lower than 100 ft, or no DH; and
(b) RVR lower than 200 m but not less than 75 m. . ‘Category A with respect to helicopters’ means a multi-engined helicopter designed with engine and system isolation features specified in the applicable airworthiness codes and capable of operations using take-off and landing data scheduled under a critical engine failure concept that assures adequate designated surface area and adequate performance capability for continued safe flight or safe rejected take-off in the event of engine failure. . ‘Category B with respect to helicopters’ means a single-engined or multi-engined helicopter that does not meet Category A standards. Category B helicopters have no guaranteed capability to continue safe flight in the event of an engine failure, and unscheduled landing is assumed.  . ‘Certification Specifications’ are technical standards adopted by the Agency indicating means to show compliance with the essential requirements of Annexes I, IV and Va to Regulation (EC) No 216/2008. . ‘Circling’ means the visual phase of an instrument approach to bring an aircraft into position for landing on a runway/FATO that is not suitably located for a straight-in approach. . ‘Clearway’ means a defined rectangular area on the ground or water under the control of the appropriate authority, selected or prepared as a suitable area over which an aeroplane may make a portion of its initial climb to a specified height. . ‘Cloud base’ means the height of the base of the lowest observed or forecast cloud element in the vicinity of an aerodrome or operating site or within a specified area of operations, normally measured above aerodrome elevation or, in the case of offshore operations, above mean sea level. . ‘Code share’ means an arrangement under which an operator places its designator code on a flight operated by another operator, and sells and issues tickets for that flight.
　
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本文鏈接地址：Annexes to the draft Commission Regulation on ‘Air Operations - OPS’(2)