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19 Jun 2025, 05:56 [ UTC - 5; DST ]


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 Post subject: Re: The Cost of Pratt & Whitney Overhauls
PostPosted: 15 Jun 2025, 01:02 
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A CJ4 landed behind me at Billy Mitchell Airport (KHSE) on Thursday. It's 3000'. I was pretty impressed.

Larry Ellison's CJ4 operates out of KSQL, 2621 ft.

CJ4 has a proper lift dump system that other small cabin Citations lack, but also has no TRs.

Mike C.


ISTR no CJ's have thrust reversers. At least some have thrust attenuators to help minimize residual thrust, control taxi speeds, etc.

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 Post subject: Re: The Cost of Pratt & Whitney Overhauls
PostPosted: 15 Jun 2025, 12:57 
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At least some have thrust attenuators to help minimize residual thrust, control taxi speeds, etc.

The thrust attenuators are on the DEEC engines which have higher idle thrust. The DEEC has limited authority to control the engine.

The engines with FADEC have lower idle thrust since they have complete closed loop control and full authority.

I suspect the DEEC airplanes with paddles deployed are similar idle thrust as the FADEC engines with no paddles. In other words, I wouldn't assume the paddles mean better idle thrust.

Mike C.

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 Post subject: Re: The Cost of Pratt & Whitney Overhauls
PostPosted: Yesterday, 09:45 
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Are the runway requirements similar? I don't have a POH on hand for either.

I've seen B200s operating out of KPAO (2440') , I don't know how much more runway B350s take


The 350 would be better.

A B200GT (big motors but no winglets or Raisbeck mods) would use around 1900 ft ground roll on a calm wind 25° C day at gross weight. 2600 ft to clear a 50 ft obstacle. That’s around 3800 lbs of fuel or payload

The accelerate-go distance would be 5000 ft to 35 AGL

A 350 doesn’t have takeoff roll data, but same weather conditions carrying more weight (5000 lbs) yields an accelerate-go of 3600 ft.

You can infer that it’ll be a shorter takeoff roll

No planes allowed into PAO with max gross weight over 12500 lbs though, even though that’d be the better machine getting in and out of there


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