ETOPS is a standard of the flying duration with only one engine that mandated by International Civil Aviation Organization (ICAO) to all twin-engined commercial aircrafts. The minimum of 60 minutes ETOPS has been applied to smaller aircrafts such as Airbus A320 which AirAsia is flying.Larger aircrafts such as Airbus A330 and Boeing 777 are fitted with a stricter ETOPS of 180 minutes. In 2007, United Airlines Boeing 777 from Auckland to San Francisco made a historical record of flying the plane with single engine for 192 minutes and landed safely after an engine failure that force the pilots to divert to the nearest airport which demanded more hours than the ETOPS suggested.
ETOPS may be replaced by a newer system, referred to as LROPS (Long Range Operational Performance Standards), which will affect all civil airliners, not just those with a twin-engine configuration.
Government-owned aircraft (including military) do not have to abide to the ETOPS. In 1980s, the term EROPS (extended range operations) was used before being superseded by ETOPS usage.
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