Pitot-static system

[azaviator08]

Does anyone have a good reference or know the errors of the pitot-static system specific to a piper warrior pitot-tube. It has the drain seperate from the tube and the tube just contains ram air and 2 static sources. It is strange when you try to explain it because every book has the pitot and drain together and then the static source seperate. If the whole pitot tube gets iced over the drain will the drain still be open? Does anyone know where the actual drains are on the airplane? I know that there are two buttons on the pilot side where you can drain the system. But, where does this drain to? I've been struggling a little bit when explaining this to my students because I am really unsure myself.

[Douglas]

I thought there was drain on the pitot mast of pipers. I could be wrong seeing it has been a while since I've flown one.

[PeterPilot]

http://forums.jetcareers.com/technic...r-archers.html

[azaviator08]

Still doesn't really answer my question. I know for a fact (you can look in the POH) that the pitot tube has 3 holes. I for ram air and 2 static holes. The drain is seperate. I just want to know what will the errors be especially relating to this system because of its differences.

[PeterPilot]

Why do you believe moving the location of the holes would change the kind of errors the pitot static system might experience?

Differences in location can change the probability of experiencing a problem, but the same "plumbing" applies.

[azaviator08]

So lets say the whole pitot tube got iced over. All of the pitot static instruments would be affected. Except the drain whole would remain unblocked. So the ASI would read 0, Altimeter would be frozen, and VSI read 0. Can anybody think of a reason why the drain whole would become blocked? Because to me this seems impossible.

[mojo6911]

Originally Posted by azaviator08

So lets say the whole pitot tube got iced over. All of the pitot static instruments would be affected. Except the drain whole would remain unblocked. So the ASI would read 0, Altimeter would be frozen, and VSI read 0. Can anybody think of a reason why the drain whole would become blocked? Because to me this seems impossible.

If the pitot tube gets iced over, only the airspeed indicator will be effected. The Altimeter and VSI work on static air only.

[shdw]

Now I am not familiar with the warrior specifically, but the Arrow has the exact same pitot tube. I don't recall any separate drain hole? It had 3 holes: one for ram air, one for drain, and one static port. Who told you, or where did you read, that those two holes are both static ports? If they are, then where is the drain hole?

[Maurus]

Originally Posted by shdw

Now I am not familiar with the warrior specifically, but the Arrow has the exact same pitot tube. I don't recall any separate drain hole? It had 3 holes: one for ram air, one for drain, and one static port. Who told you, or where did you read, that those two holes are both static ports? If they are, then where is the drain hole?

Trying to figure that one out for myself. Front is ram air, bottom is drain, back is static. Same as on the Diamonds.

[juskl]

The piper series has a Pitot mast... The front hole is for the ram air, the hole on the bottom is the drain hole and the small pinpoint hole on the rear of the mast is the static port... there is only one drain hole and that is the one on the mast... There is an alternate static source that is located under the dash on the pilot's side. Feels like a small butterfly valve.. Otherwise, I have no idea what you are refering too.. there is no drain ability for the pilot to clear the system (so to speak) from the cockpit..

[shdw]

Originally Posted by Maurus

Trying to figure that one out for myself. Front is ram air, bottom is drain, back is static. Same as on the Diamonds.

I thought maybe some mechanic thought they would play a practical joke on the pilots by cutting a pin size hole under the rudder and saying it was the pitots tubes drain hole.

PS If anyone cares the official name appears to be "Piper Blade Pitot Tube." But interestingly enough I cannot find any of them for sale or with schematics. All I can find is stinken covers for them.

[azaviator08]

Actually an examiner told everyone at our flight school that they were both static sources.

[Mike H]

Originally Posted by juskl

there is no drain ability for the pilot to clear the system (so to speak) from the cockpit..

The Warrior/Archer & both the Arrow, and the Seminole have manual drains for the pitot/static system on the left side cabin wall, just below the pilot's seat. Draining the system is part of the preflight checklist.

[African_Swallow]

Google brought me to a 2002 thread on this site: http://forums.jetcareers.com/technic...r-archers.html

[Maurus]

Originally Posted by Mike H

The Warrior/Archer & both the Arrow, and the Seminole have manual drains for the pitot/static system on the left side cabin wall, just below the pilot's seat. Draining the system is part of the preflight checklist.

Not on older models.

[Mike H]

How old are you talking?

[Mike H]

update: the pitot/static system drain was definitely on the 1977 Archer II & Warrior.

I also flew a Cherokee 180 G (1971?) a few times but I don't recall if it had the drains in it