Does the phrase ".78/280/250" have a standard meaning to an airline pilot, in the context of a long descent?
Specific context-- the table in this answer-- Is the descent performance of the PMDG 737-800 accurate?
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asked Mar 10, 2020 at 13:01
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1$\begingroup$ OK, appears to be duplicate of aviation.stackexchange.com/questions/49028/… , so I guess I have my answer. $\endgroup$– quiet flyerCommented Mar 10, 2020 at 13:10
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1 Answer
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It means the profile is based on descending at 0.78 Mach until the IAS increases to 280 knots, at which point that speed is maintained to 10,000', at which point the aircraft slows to 250 knots for the remainder of the descent until it's time to slow & configure for landing. That 0.78/280/250 is a very standard profile for descent planning in the 737, although variations such as 0.80/320/250 or 0.76/250 are certainly possible.
answered Mar 10, 2020 at 13:13