AC 120-42B ETOPS and Polar Ops - Code7700

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AC 120-42B 6/13/08ETOPS Alternate MinimumApproach FacilityConfiguration 1For airports with at least oneoperational navigationalfacility providing a straight-innon-precision approachprocedure, or Category Iprecision approach, or, whenapplicable, a circlingmaneuver from an instrumentapproach procedure.For airports with at least twooperational navigationalfacilities, each providing astraight-in approach procedureto different suitable runways.Alternate Airport IFRWeather Minimum Ceiling 2Add 400 ft to the MDA(H) orDA(H), as applicable.Add 200 ft to the higherDA(H) or MDA(H) of the twoapproaches used.Alternate Airport IFRWeather MinimumVisibility 3Add 1 sm or 1600m to thelanding minimum.Add ½ sm or 800m 4 to thehigher authorized landingminimum of the twoapproaches used.One useable authorizedCategory II ILS IAP.One useable authorizedcategory III ILS InstrumentApproach Procedure (IAP).300 feet 3/4 sm (1200 m) or RVR 4000(1200 m)200 feet 1/2 sm (800 m) 4 or RVR 1800feet (550 m)1 When determining the usability of an IAP, wind plus gust must be forecast to be within operating limits, includingreduced visibility limits, and should be within the manufacturer’s maximum demonstrated crosswind value.2 Conditional forecast elements need not be considered, except that a PROB40 or TEMPO condition below thelowest applicable operating minima must be taken into account.3 When dispatching under the provisions of the MEL, those MEL limitations affecting instrument approach minimamust be considered in determining ETOPS alternate minima.4 For operations outside United States, because of variations in the international metric weather forecastingstandards, 700m may be used in lieu of 800m.Page 28 Par 303
6/13/08 AC 120-42B(6) Fuel Supply. The certificate holder must comply with the ETOPS en route fuelsupply as specified in § 121 .646(b) as follows:(a) No person may dispatch or release for flight or takeoff a turbine enginepoweredairplane in ETOPS unless, considering wind and other weather conditions expected, ithas the fuel required by normal Flag or supplemental carrier requirements and enough fuel tosatisfy paragraphs 1 through 4 below:1. The greater amount of fuel sufficient to fly to an ETOPS alternate underthe following three scenarios:• Assuming a rapid decompression at the most critical point followed bydescent to a safe altitude in compliance with the oxygen supplyrequirements of § 121.333, or• At the approved one-engine inoperative cruise speed assuming a rapiddecompression and a simultaneous engine failure at the most criticalpoint followed by descent to a safe altitude in compliance with theoxygen supply requirements of § 121.333, or• At the approved one-engine inoperative cruise speed assuming an enginefailure at the most critical point followed by descent to the one-engineinoperative cruise altitude.2. Upon reaching the alternate, hold at 1,500 ft above field elevation for15 minutes and then conduct an instrument approach and land.3. Add a 5 percent wind speed factor (that is, an increment to headwind or adecrement to tailwind) on to the actual forecast wind used to calculate fuel in paragraph 1 aboveto account for any potential errors in wind forecasting. If a certificate holder is not using theactual forecast wind based on a wind model acceptable to the FAA, the airplane must carry5 percent of the fuel required for paragraph 1 above, as reserve fuel to allow for errors in winddata. A wind aloft forecast distributed worldwide by the World Area Forecast System (WAFS) isan example of a wind model acceptable to the FAA.4. After completing the calculation in paragraph 3, compensate inparagraph 1 above with additional fuel for the greater of the following scenarios:• The effect of airframe icing during 10 percent of the time during whichicing is forecast (including ice accumulation on unprotected surfaces,and the fuel used by engine and wing anti-ice during this period). Unlessa reliable icing forecast is available, icing may be presumed to occurwhen the total air temperature at the approved one-engine cruise speed isless than +10 degrees Celsius, or if the outside air temperature isbetween 0 degrees Celsius and -20 degrees Celsius with a relativehumidity of 55 percent or greaterPar 303 Page 29
Page 1 and 2: U.S. Departmentof TransportationFed
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Page 7 and 8: 6/13/08 AC 120-42BCHAPTER 2. BACKGR
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Page 25 and 26: 6/13/08 AC 120-42Bk. Engine Conditi
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Page 35 and 36: 6/13/08 AC 120-42Bflight crewmember
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Page 43 and 44: 6/13/08 AC 120-42B(1) 75-minute ETO
Page 45 and 46: 6/13/08 AC 120-42Brobust to protect
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Page 56 and 57: AC 120-42B 6/13/8Appendix 19. ETOPS
Page 59 and 60: AC 120-42BAppendix 2APPENDIX 2. ETO
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AC 120-42B ETOPS and Polar Ops - Code7700

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