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Fokker 50 PEC fault

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Fokker 50 PEC fault

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Old 11th August 2002 | 04:10
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Joined: Jun 2000
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From: West of East
Fokker 50 PEC fault

In the F50, when a Prop Electronic Control fails the Np will go to 104%

The QRH then states that a speed limit of 220 knots TAS (not IAS) applies.

Anyone know why this limit would be a TAS and not an IAS?

It's definately not a typo in the QRH as a table is provided for you to work out TAS limits at various levels based on IAS.
Crash & Burn is offline  
Old 13th August 2002 | 11:36
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Joined: Oct 1999
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My ill informed guess Crash is that it is to do with issues of compressibility or mach no at the blade tips at high TAS and high RPM.
Bally Heck is offline  
Old 13th August 2002 | 21:05
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From: a fence in the sun
Spot on.
NorthernSky is offline  
Old 14th August 2002 | 00:59
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From: West of East
Thanks for that guys,

Now I have a direction to head in whilst looking for a definitive answer.

Cheers
Crash & Burn is offline  

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