Stnelson903 Posted May 30, 2018 Report Share Posted May 30, 2018 I have a “new to me” 1978 M20k 231. Poh shows a drain at the port side wing root for the pitot system. I see an empty hole. Is the supposed to be a button sticking down or do I press inside with a small punch? S. T. Nelson N231JG Just Go Quote Link to comment Share on other sites More sharing options...
Guest Posted May 30, 2018 Report Share Posted May 30, 2018 2 minutes ago, Stnelson903 said: I have a “new to me” 1978 M20k 231. Poh shows a drain at the port side wing root for the pitot system. I see an empty hole. Is the supposed to be a button sticking down or do I press inside with a small punch? S. T. Nelson N231JG Just Go Normally there is a small 3/16” pin sticking out of the lower wing surface right beside the fuselage. Clarence Quote Link to comment Share on other sites More sharing options...
Stnelson903 Posted May 30, 2018 Author Report Share Posted May 30, 2018 Thanks. Just an empty hole S. T. NelsonN231JGJust Go Quote Link to comment Share on other sites More sharing options...
Bryan Posted May 30, 2018 Report Share Posted May 30, 2018 On my 252, yes, right next to the fuselage on the wing root at the pilot-side window, I have a push button drain button. There is also a static drain (same type of button) on the fuse on the same side b/w the wing and the elevator. Quote Link to comment Share on other sites More sharing options...
Stnelson903 Posted May 30, 2018 Author Report Share Posted May 30, 2018 On my 252, yes, right next to the fuselage on the wing root at the pilot-side window, I have a push button drain button. There is also a static drain (same type of button) on the fuse on the same side b/w the wing and the elevator. ThanksS. T. NelsonN231JGJust Go Quote Link to comment Share on other sites More sharing options...
Mooneymite Posted May 30, 2018 Report Share Posted May 30, 2018 Seems like we just discussed this? Quote Link to comment Share on other sites More sharing options...
carusoam Posted May 31, 2018 Report Share Posted May 31, 2018 Now the next question... How does one get access to remount the drain valve? Is that from inside the cabin? Don’t accidently open a fuel bay... aircraft spruce may have pictures of Pitot drain valves... that may be enlightening..? PP thoughts only, not a mechanic... Best regards, -a- Quote Link to comment Share on other sites More sharing options...
Stnelson903 Posted May 31, 2018 Author Report Share Posted May 31, 2018 Seems like we just discussed this? Thank you. S. T. NelsonN231JGJust Go Quote Link to comment Share on other sites More sharing options...
Marauder Posted May 31, 2018 Report Share Posted May 31, 2018 Thank you. S. T. NelsonN231JGJust Go If you are just seeing a hole, my guess is the O ring failed in the valve and instead of replacing it or the valve, the easier solution was to remove it. I believe the static and pitot drains are the same. Sent from my iPhone using Tapatalk Pro Quote Link to comment Share on other sites More sharing options...
Stnelson903 Posted May 31, 2018 Author Report Share Posted May 31, 2018 If you are just seeing a hole, my guess is the O ring failed in the valve and instead of replacing it or the valve, the easier solution was to remove it. I believe the static and pitot drains are the same. Sent from my iPhone using Tapatalk Pro Thanks. I’ll look this weekend. If missing, I’ll have to figure how to drain it. Airspeed dose not return to zero. S. T. NelsonN231JGJust Go Quote Link to comment Share on other sites More sharing options...
Guest Posted May 31, 2018 Report Share Posted May 31, 2018 47 minutes ago, Stnelson903 said: Thanks. I’ll look this weekend. If missing, I’ll have to figure how to drain it. Airspeed dose not return to zero. S. T. Nelson N231JG Just Go Your ASI not returning to zero likely has nothing to do with the drain or lack there of. If there is concern of contamination in the pitot line, you can blow the line out from the ASI end of the system. Be sure to disconnect the air speed safety switch for the landing gear before blowing through the lines. Clarence Quote Link to comment Share on other sites More sharing options...
Mark89114 Posted June 1, 2018 Report Share Posted June 1, 2018 Has anybody ever gotten moisture out of it? I press the button on preflight, probably going to wear the o ring out....... Quote Link to comment Share on other sites More sharing options...
Marauder Posted June 1, 2018 Report Share Posted June 1, 2018 Just now, Mark89114 said: Has anybody ever gotten moisture out of it? I press the button on preflight, probably going to wear the o ring out....... I have on the static drain and the fact the seat corroded suggests water was in there. Quote Link to comment Share on other sites More sharing options...
Mooneymite Posted June 1, 2018 Report Share Posted June 1, 2018 In a short 20 years, I have never gotten anything out of either pitot, or static drains. Of course, in the last 15 years of that 20, I gave up checking because I never found any water. I'm not sure whether the risk of water is greater than the risk of a drain not properly sealing after checking. 3 1 Quote Link to comment Share on other sites More sharing options...
ArtVandelay Posted June 1, 2018 Report Share Posted June 1, 2018 In a short 20 years, I have never gotten anything out of either pitot, or static drains. Of course, in the last 15 years of that 20, I gave up checking because I never found any water. I'm not sure whether the risk of water is greater than the risk of a drain not properly sealing after checking. How often do you fly through rain? Quote Link to comment Share on other sites More sharing options...
Mooneymite Posted June 1, 2018 Report Share Posted June 1, 2018 1 hour ago, teejayevans said: How often do you fly through rain? Sometimes.... Keeping the airplane hangared is probably a bigger factor. Quote Link to comment Share on other sites More sharing options...
Marauder Posted June 1, 2018 Report Share Posted June 1, 2018 24 minutes ago, Mooneymite said: Sometimes.... Keeping the airplane hangared is probably a bigger factor. Not to mention covering the static ports with blue painter's tape when washing the plane. 1 Quote Link to comment Share on other sites More sharing options...
Marcopolo Posted June 1, 2018 Report Share Posted June 1, 2018 On 5/30/2018 at 5:48 PM, Stnelson903 said: I see an empty hole. Is the supposed to be a button sticking down or do I press inside with a small punch? If you have the normal 231 wing root fairing then the button will not be evident in the hole, you will need to press it with a pen cap or other smaller device. Ron Quote Link to comment Share on other sites More sharing options...
carusoam Posted June 1, 2018 Report Share Posted June 1, 2018 7 hours ago, Mark89114 said: Has anybody ever gotten moisture out of it? I press the button on preflight, probably going to wear the o ring out....... Iirc... 201er video taped issues caused by water in the Pitot/static system after being outside in a strong rainstorm... A fair amount came out... Best regards, -a- Quote Link to comment Share on other sites More sharing options...
Marauder Posted June 1, 2018 Report Share Posted June 1, 2018 Iirc... 201er video taped issues caused by water in the Pitot/static system after being outside in a strong rainstorm... A fair amount came out... Best regards, -a- And I thought that was caused by him hooking up the José relief tube system incorrectly. Sent from my iPad using Tapatalk Pro 2 1 Quote Link to comment Share on other sites More sharing options...
carusoam Posted June 1, 2018 Report Share Posted June 1, 2018 Noooooo! he said Pitot drain, not pilot drain! Can I get a snare drum for that.... -a- 2 1 Quote Link to comment Share on other sites More sharing options...
Stnelson903 Posted June 1, 2018 Author Report Share Posted June 1, 2018 Noooooo! he said Pitot drain, not pilot drain! Can I get a snare drum for that.... -a- Ba-da-boom. S. T. NelsonN231JGJust Go 2 Quote Link to comment Share on other sites More sharing options...
Stnelson903 Posted June 1, 2018 Author Report Share Posted June 1, 2018 Any ideas then on why asi is not returning to zero?S. T. NelsonN231JGJust Go Quote Link to comment Share on other sites More sharing options...
Guest Posted June 1, 2018 Report Share Posted June 1, 2018 34 minutes ago, Stnelson903 said: Any ideas then on why asi is not returning to zero? S. T. Nelson N231JG Just Go Remove the glare shield and remove the pitot line from the back of the ASI and see if it returns to zero. If it doesn’t the ASI requires a repair. Clarence Quote Link to comment Share on other sites More sharing options...
thinwing Posted June 2, 2018 Report Share Posted June 2, 2018 On 5/30/2018 at 6:47 PM, carusoam said: Now the next question... How does one get access to remount the drain valve? Is that from inside the cabin? Don’t accidently open a fuel bay... aircraft spruce may have pictures of Pitot drain valves... that may be enlightening..? PP thoughts only, not a mechanic... Best regards, -a- On a Bravo it is from inside cabin after removing pilots side lower interior panel.I had an avionics shop while sourcing a static leak caused by a cracked o ring ,prepare to drill rivets to remove left wing filet when I said...stop ..call Mooney or an MSC! 1 Quote Link to comment Share on other sites More sharing options...
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