View Full Version : B200 OEI perf question in icing
Flap Sup
5th Sep 2009, 12:46
Hi there,
I have had some discussions with colleges regarding oei performance in icing on the B200.
Raisbeck says climbspeed 121kt, but Beechcraft requires 140kt in order to avoid ice buildup on the underside of the wings.
I have during simulated oei situations tested that it will climb with 140kt, but at what rate? Anyone has any data?
Brgs
Flaps
Kelly Hopper
6th Sep 2009, 06:15
No official data but I can confirm a MIN climb speed of 140kts (it may actually be 160 kts, but twas a long time ago) to avoid ice buildups.
A former colleague experienced it once and it became very nasty indeed so well worth abiding by. If my memory serves me well 121 kts is blue line but assuming no icing?
eyeinthesky
7th Sep 2009, 11:02
121kts (blue line) to get away from the ground as quickly as possible, then accelerate to 140+ when able to minimise ice build-up.
If the ice build-up is so fast that you can't get far enough away from the ground to be able to accelerate before the ice makes you too heavy, then it's just not your day!:eek:
Flap Sup
7th Sep 2009, 12:38
eyeinthesky,
I'm afraid that I find that explanation is too easy.
Vyse is 121 - and all published performance data is calculated on that speed. I havent been able to find any performance data on 140kt.
If I have to start from an airfield with a high msa and have to climb through icing conditions, i need some kind of performance data to show to the caa if they ask. I know from simulated oei flight that the aircraft will climb with 140kt, but I dont have any data for it.
/Flaps
Kelly Hopper
7th Sep 2009, 18:56
Just a thought:
It's been a very long time since I was flying the 200 but I remember it as a perf C aircraft. Are you sure you are not applying perf A requirements to this?
His dudeness
7th Sep 2009, 19:55
IŽd guess eye is right.
Its a class B airplane, and it certified by FAR/JAR23 and I guess youŽll have to live with the problems or rather gray areas that result from that.
E.G.: takeoff wise you can use all engine to 50ft by 115% which in reality means nothing. All Engine you`re okay anyways and SE it does not give you enough margin to make it.
IIRC there is no provision for A/I speedwise (as you already found out) and that is that. But why not ask Raisbeck? In my experience they are good people...
Raisbeck Engineering, Inc. (800) 537-7277; (206) 723-2000 Home Page (http://www.raisbeck.com)