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Height Deviations

Air Safety Week, Dec 12, 2005

An urgent airworthiness directive (AD) was issued Nov. 15 by the Civil Aviation Safety Authority (CASA) of Australia regarding the Dornier 328, directing that this statement be included in the airplane flight manual: "Operation in Reduced Vertical Separation Minimum [RVSM] airspace is prohibited."

Recall that in RVSM airspace the vertical separation of aircraft is only 1,000 feet, or half the separation allowed in non-RVSM airspace. According to the CASA AD: "The German Luftfahrt-Bundesamt (LBA) has advised that Eurocontrol has found large height deviations whilst monitoring the performance of the Dornier 328 RVSM fleet and that as a result the approval for RVSM operations has been suspended in European airspace. RVSM operations may be resumed following optional actions in accordance with the two referenced SBs [service bulletins]."

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Despite the fact that Dornier 328s operate in the United States, which, like the Europeans, has gone to RVSM to cram more airplanes into the sky, no comparable AD has evidently been issued by the Federal Aviation Administration (at least, a search did not turn up one).

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Height Deviations

Air Safety Week, Dec 12, 2005

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