At 14 : 24 Central Standard Time, Flight 553 was cleared by air traffic control to Midway Airport on an approach to runway 31L . The localizer approach for runway 31L used an Outer Marker Beacon ( OMB ) named " Kedzie, " located prior to the threshold of runway 31L . Under the published landing procedures, the aircraft was to maintain a minimum altitude of until it passed the OMB, at which point the flight was allowed to descend to a minimum altitude of.
22.
That's pretty much what I wanted to know, thanks ! ( BTW, in the scenario I have in mind, the beacon is near the approach end of the runway and aligned with it, sort of like a LOM ( Locator Outer Marker ) but closer to the runway . ) Just one more thing, what would be a ballpark figure for a typical NDB approach MDA in these circumstances ? 1000 feet AGL, maybe less ? talk ) 23 : 29, 24 August 2009 ( UTC)
23.
:Another possibility that nobody so far has mentioned is that the Boeing's 511-knot cruising speed is only achievable at high altitude ( above 25, 000 feet )-- below that level, it drops off sharply so that near sea level, the V ( ne ) ( that's the MAXIMUM safe speed ) is only 330 knots ! ( This is true of ALL jetliners, as a matter of fact-- the engines produce less power at low altitude, and the denser, more turbulent air puts unacceptable stress on the airframe . ) And since for such a relatively short flight, the plane spends a greater part of the journey at low altitudes, even its average FLYING speed will be lower because of this . ( Not to mention the time spent in the holding pattern at the outer marker while waiting to land . ) talk ) 04 : 59, 21 May 2013 ( UTC)
