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-   -   Descending Deceleration 737 (https://www.pprune.org/tech-log/353692-descending-deceleration-737-a.html)

DC-ATE 7th December 2008 01:38

PantLoad has pretty well got it figured out.

Another thing you can try is descending at 350 to 12,500. Reduce to 1000FPM. At 10T you'll be right at 250. Simple. Continue down at 1500FPM. Slow to 200 at 3000AG. Select Flaps 1, 2, 5, 10, 15 as the speed gets to the appropriate spot.

All this at Idle, and assuming ATC is no problem.

As you cross the Marker, throw the gear out and select Flaps 25. Slide down the G/S and at 1000AG go to F30. At 500 AG, F40. If it wasn't for the "stabilized approach" procedure now used by everyone (I think) you could have landed without ever having to have touched the throttles (excuse me.....thrust levers!) from 35,000 feet!

Unfortunately, I guess you'll never get to try this all the way to touchdown these days. But, the -37 is a great little machine. Spent nine years on it in both seats.

BTW, this only works on the -200. The -300 takes a little more fiddling. I'm sure all the later models would be the same as the -300. Only spent a short time on the -300.

Denti 7th December 2008 06:34


Another thing you can try is descending at 350 to 12,500.
That could lead very fast to a tea without biscuits at the headquarter. Do it 20 kts slower and it might be safe. At least on -300 and higher models.

Yon Garde 27th December 2008 03:48

Stating the obvious I know, but why not just do it in VNAV. Works smoothly and efficiently (almost) every time unless of course ATC or other traffic is being unhelpful. Intervening with numerous pitch modes usually just increases workload with no real benefit. Just my 2 cent's worth :)

framer 27th December 2008 08:12

I agree.I normally only go into all this stuff if VNAV isn't playing the game due traffic.

BOAC 27th December 2008 08:49


Originally Posted by YG
Works smoothly and efficiently (almost) every time

- well, a little 'off thread' now, but I would disgree. I am constantly amazed at the poor pitch control of most 737s 3-7) in a/p VNAV. Whether it be maintenance or design faults I know not.

framer 27th December 2008 09:05

Maybe it's maintenance? I find that if there are accurate winds, temp and qnh in the descent forecast pg then it does a good job on the 300.

Sciolistes 28th December 2008 05:17

There are differences in our fleet, some OK some not so good. But there better ones are still course and clumsy in this regard.

Stating the obvious I know, but why not just do it in VNAV. Works smoothly and efficiently (almost) every time
On the Classic, inputing a descent forecast still results in the ubiquitous DRAG REQUIRED nearly every time. It seems one needs to fake additional tailwind to ensure a smooth VNAV PTH descent.

Intervening with numerous pitch modes usually just increases workload
with no real benefit. Just my 2 cent's worth
Agreed. If it isn't working out in VNAV then just extend the rwy centre line, LVL CHG and work it out from there.

framer 28th December 2008 23:07


one needs to fake additional tailwind to ensure a smooth VNAV PTH descent.
Ha ha good point, I have to admit that I round up tail winds and round down head winds....maybe thats the key with the ole 737's.


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