160 to 4 - deceleration rate (again)
Only half a speed-brake
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160 to 4 - deceleration rate (again)
Hello, to clarify a discussion with a new colleague: How quickly do you need us to decelerate from 180 to 160 knots on final approach?
I like to keep 180 until instructed to reduce, and if that comes after GS intercept, say at 7,5 NM, then the flaps/gear sequence provided in the Pilot's Handbook for decelerated approaches would only yield 160 kt by 5 NM.
Those 50 seconds do not feel like doing what was asked for. Hence a different flap/gear sequence needs to be adopted, that would be my point.
Looking for facts to support my case, thanks.
I like to keep 180 until instructed to reduce, and if that comes after GS intercept, say at 7,5 NM, then the flaps/gear sequence provided in the Pilot's Handbook for decelerated approaches would only yield 160 kt by 5 NM.
Those 50 seconds do not feel like doing what was asked for. Hence a different flap/gear sequence needs to be adopted, that would be my point.
Looking for facts to support my case, thanks.
Last edited by FlightDetent; 9th Apr 2017 at 09:28. Reason: Unscrambled, hopefully.
Isn't it more a case of being instructed not to decelerate (i.e. "maintain 160 to 4"), rather than not being instructed to decelerate ?
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At the point the instruction is given the aircraft should still be at 180kts and ATC would expect a fairly rapid reduction to 160, especially if 2.5nm spacing is in force.
How quickly do you need us to decelerate from 180 to 160 knots once instructed on the final approach?
That's a speed loss of about 0.3 kts per second.
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There is to my knowledge nothing laid down but after talking to various crews one knot per second seems common and I think that matches what controllers would expect.
Only half a speed-brake
Thread Starter
I rewrote the original post as it was assembled in a confusing manner.
"... would expect a fairly rapid reduction" has all the emphasis I need.
"1 kt/s" translates to about 0,8 miles, same goal.
Thanks all, happy to see HD still watching over us.
"... would expect a fairly rapid reduction" has all the emphasis I need.
"1 kt/s" translates to about 0,8 miles, same goal.
Thanks all, happy to see HD still watching over us.