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Pitot static

 
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riddon(at)sent.com
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PostPosted: Mon Jun 16, 2014 11:15 pm    Post subject: Pitot static Reply with quote
I had an interesting experience yesterday when attempting a permit test flight. Had my plane at home for a 50 hour check and its annual inspection. Trailered it down to the field for test flight but on the first take off run noticed that the ASI was stuck on zero. Aborted the run and checked the pitot. All looked Ok. gentle blowing into the pitot made the ASI twitch. Tried a rubber pipe on it and rolled it up to produce pressure. ASI responded OK and held the reading. Attempted a second run with same result. Still no air speed indication. On further examination I noticed hat the plastic tip rom the static port was missing. Obviously the static pressure was the same as the pitot hence a zero ASI reading. As an emergency temporary fix I disconnected the static pipe at a connection inside the cockpit which then gave me a satisfactory reading and I was able to do the test flight OK. Comparing airspeed to GPS it seemed fairly accurate. I guess somewhere along the line I must have caught the plastic tip and broken it off. It would seem to be a vulnerable arrangement and wondered if I could get a more robust replacement or locate a static port somewhere else to avoid a repetition?

Richard Iddon.

G-RIXS

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pete(at)lawless.info
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PostPosted: Mon Jun 16, 2014 11:29 pm    Post subject: Pitot static Reply with quote
Hi Richard

Been there done exactly the same thing! Drill out the remains of the
plastic plug. Drill a small hole right through the metal about half an
inch back from the end of the static pipe and plug the end. Works a
treat, no noticeable difference on indications and you can't knock the
end off again.

Regards

Pete

On 17/06/14 08:01, Richard Iddon wrote:
Quote:


I had an interesting experience yesterday when attempting a permit test flight. Had my plane at home for a 50 hour check and its annual inspection. Trailered it down to the field for test flight but on the first take off run noticed that the ASI was stuck on zero. Aborted the run and checked the pitot. All looked Ok. gentle blowing into the pitot made the ASI twitch. Tried a rubber pipe on it and rolled it up to produce pressure. ASI responded OK and held the reading. Attempted a second run with same result. Still no air speed indication. On further examination I noticed hat the plastic tip rom the static port was missing. Obviously the static pressure was the same as the pitot hence a zero ASI reading. As an emergency temporary fix I disconnected the static pipe at a connection inside the cockpit which then gave me a satisfactory reading and I was able to do the test flight OK. Comparing airspeed to GPS it seemed fairly accurate. I guess somewhere along the line I must have!
caught the plastic tip and broken it off. It would seem to be a vulnerable arrangement and wondered if I could get a more robust replacement or locate a static port somewhere else to avoid a repetition?

Richard Iddon.

G-RIXS



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riddon(at)sent.com
Guest
PostPosted: Tue Jun 17, 2014 7:13 am    Post subject: Pitot static Reply with quote
That sounds like a good solution.

Thanks Pete.

Richard Iddon

G-RIXS
On 17 Jun 2014, at 08:28, Pete Lawless <pete(at)lawless.info> wrote:

Quote:


Hi Richard

Been there done exactly the same thing! Drill out the remains of the plastic plug. Drill a small hole right through the metal about half an inch back from the end of the static pipe and plug the end. Works a treat, no noticeable difference on indications and you can't knock the end off again.

Regards

Pete



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