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g. If contact was not established prior to deviating, continue trying to contact ATC to obtain clearance. If contact was established, continue to keep ATC advised of intentions and obtain traffic information. h. When returning to track and within approximately 10NM of track, be at the assigned flight level. 1.7 Aircraft Deviations – Greater Than Moderate Turbulence 1.7.1 If greater than moderate turbulence is experienced, and the pilot believes it will impact on the aircraft’s capability to maintain the Cleared Flight Level (CFL), the pilot should proceed as follows: a. Watch for possible conflicting traffic and make maximum use of exterior lights. b. Broadcast callsign, position, level, nature and severity of turbulence and intentions on 121.5MHZ (inter-pilot frequency may be used as a back-up). c. Notify ATC as soon as possible and request level change if necessary. d. If the CFL cannot be maintained, execute established contingency procedures to leave assigned track or route. Note: Based on pilot advice and traffic assessment, the ATS provider may suspend RVSM operations. 1.8 Aircraft Deviations – Other Than Weather 1.8.1 The following procedures are applicable primarily when sub-sonic aircraft require rapid descent and/or turn-back or diversion to an alternate airport. The pilot’s judgment will determine the sequence of actions to be taken, taking into account specific circumstances. 1.8.2 If an aircraft is unable to continue flight in accordance with its air ATC clearance, a revised clearance must, whenever possible, be obtained prior to initiating any action, using the radiotelephony distress or urgency signal as appropriate. 1.8.3 If prior clearance cannot be obtained, an ATC clearance must be obtained at the earliest possible time. Until a revised clearance is received, the pilot must comply with the following: a. If possible, deviate away from an organised track or route system. b. Broadcast the following at suitable intervals on the frequency in use and on frequency 121.5MHZ (as a back-up, the VHF interpilot air-to-air frequency 123.45MHZ may be used): GEN TOC ENR TOC AD TOC Index ENR (EN ROUTE) A/L 45 effective 24 NOV 05 (1) flight identification (operator call-sign), (2) flight level, (3) aircraft position including track code or ATS route designator, and (4) intentions, including the extent of deviation expected. c. Watch for conflicting traffic both visually and by reference to TCAS/ACAS (if equipped). d. Turn on all aircraft exterior lights (commensurate with appropriate operating limitations). 1.8.4 If unable to obtain a revised ATC clearance, the aircraft should leave its assigned route or track by turning 90° right or left, whenever this is possible. The direction of turn should be determined by the position of the aircraft relative to any organised route or track system (eg, whether the aircraft is outside, at the edge of, or within the system). Other factors to consider are terrain clearance and the levels allocated to adjacent routes or tracks. 1.8.5 Subsequent Actions. The following actions should be followed subsequent to an aircraft deviation in oceanic controlled airspace: a. Aircraft Able to Maintain Level: An aircraft able to maintain its assigned level should acquire and maintain, in either direction, a track laterally separated by 25NM from its assigned route or track, and once established on the offset track, climb or descend 500FT (150M). b. Aircraft Unable to Maintain Level: An aircraft NOT able to maintain its assigned level should, whenever possible, minimise its rate of descent while turning to acquire and maintain, in either direction, a track laterally separated by 25NM from its assigned route or track. For subsequent level flight, a level should be selected which differs by 500FT (150M) from those normally used. c. Diversion Across the Flow of Adjacent Traffic: Before commencing a diversion across the flow of adjacent traffic, the aircraft should, while maintaining the 25NM offset, expedite climb above or descent below levels where the majority of oceanic traffic operate (eg, to a level at or above FL410 or below FL285) and then maintain a level which differs by 500FT (150M) from those normally used. GEN TOC ENR TOC AD TOC Index ENR (EN ROUTE) A/L 45 effective 24 NOV 05 1.8.6 If the pilot is unable or unwilling to carry out a major climb or descent, the aircraft should be flown at a level 500FT (150M) above or below levels normally used, until a new ATC clearance is obtained. 1.9 Aircraft Deviations – ETOPS Aircraft www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：澳大利亚AIP下
