Pitot tube moves

How to keep the Cessna 170 flying and airworthy.

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Robert Eilers
Posts: 652
Joined: Sat May 08, 2004 12:33 am

Pitot tube moves

Post by Robert Eilers »

I was washing bugs off the leading edge today and noticed that my pitot tube will move a quarter inch or so if pressed. I have the original style pitot. The pitot has the black rubber grommet on it and I have never noticed any problem with the airspeed indicator. The tube moves within the hole in the leading edge. Just curious if this is ordinary or not. I suppose a some what larger black rubber grommet would fix the problem.
"You have to learn how to fall before you learn how to fly"
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GAHorn
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Joined: Fri Apr 12, 2002 8:45 pm

Re: Pitot tube moves

Post by GAHorn »

Item (2)... (see the inset at lower left) is a Tinnerman clamp, part no. A-2980A-4-27. which holds the pitot in place. Be certain it's in place, otherwise, a small amount of movement is normal.
pitot.JPG
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'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons. ;)
bsdunek
Posts: 425
Joined: Wed Feb 11, 2004 6:42 pm

Re: Pitot tube moves

Post by bsdunek »

Mine, after 59 years has very little movement. I have replaced the grommet, as they do get hard and shrink and crack. I would check to see if all the clips are in place that hold the tube to the nearby rib. Could be one of the screws is loose, or a clip is cracked.
Bruce
1950 170A N5559C
Robert Eilers
Posts: 652
Joined: Sat May 08, 2004 12:33 am

Re: Pitot tube moves

Post by Robert Eilers »

Thanks again George.
"You have to learn how to fall before you learn how to fly"
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