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"Position error" of outflow valve B737-300/-500 (4th altimeter)
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28th December 2009 | 09:07
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Cough
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Flying with packs on and outflow valve open at FL80 indicates about 83 at 250 kt, but just over 90 at 330kt. Once low, fly slow to compensate.
(found when positioning an aircraft back to base with an inop outflow valve which was secured open)
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