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Speedometer drops to 0 in snowy weather


gx22

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My stock 737 plane takes off close to sea level. When attitude reaches 4-5 thousand feet, the airplane speedometer suddenly drops to 0. This happens when I start with weather of Snow Storm or Winter Wonderland (with snow). If I change weather back to non-snow or start with non-snow weather, speedometer is normal. Has anyone seen this bug?
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Yes, I've seen the bug in reallife once. It was a cold day in december and it turned out that we forgot to pull a switch on the anti-ice panel.

 

After landing I reported the bug to Cessna. They said they'd look into it. :-)

 

 

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Actually that was a frozen engine, not a pitot tube. Pitots can be blocked by multiple things. Ice, but also insects for example. Which is why you learn to fly on nose positions and thrust settings as well as looking on instruments.

 

A blocked pitot is a hickup that's not that hard to tackle once it's properly diagnosed.

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Well...

 

This post is about a blocked pitot tube which here symptomatically gave an IAS readout around zero, in which case you're perfectly able to fly. This was what I was referring to. There are ofcourse lots of possibilities as to pitot/static port (partially) freeze-overs, but I was referring to this specific post. ;-)

 

As far as the Air Florida is concerned: I believe you instantly. I call it a frozen engine because I'm just a mortal soal. :-) I fly single engine piston, not jets.

Would it have made a difference for them to manually apply full thrust, if we could leave iced wings out of the equation, since it was only the thrust reading that was wrong?

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Actually that was a frozen engine, not a pitot tube. Pitots can be blocked by multiple things. Ice, but also insects for example. Which is why you learn to fly on nose positions and thrust settings as well as looking on instruments.

 

A blocked pitot is a hickup that's not that hard to tackle once it's properly diagnosed.

 

It was an iced-over pitot tube in the engine inlet causing erroneous readings to the pilots causing them to not push the throttles up to actual full power.

 

 

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USAF E-3 Crew Chief 1981-2001

FS2004 Century of Flight, FSX, flying since version 1.0!

A&P Mechanic...still getting my hands dirty on E-3's!...

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