chopper
Posts: 129
Joined: Mon Aug 08, 2005 12:16 am

How Hot Does Pitot

Sun Jan 28, 2001 1:03 am

tube get on the airliner jets
 
Guest

RE: How Hot Does Pitot

Sun Jan 28, 2001 1:18 am

Probably not hot at all considering it is up at 30,000 and has a wind chill factor.
If you fly throw clouds (in a small aircraft I am not sure with a jet) you have to turn on your pito heat to stop water going in it and freezing, so I guess most of the time you fly it is below 0.
Iain
 
chopper
Posts: 129
Joined: Mon Aug 08, 2005 12:16 am

RE: How Hot Does Pitot

Sun Jan 28, 2001 1:34 am

NO THESE JETS I BEEN WORKING ON LOOK LIKE THEY GET REALY HOT LOOKS LIKE ITS ALMOST BURNT
 
JETPILOT
Posts: 3094
Joined: Tue May 18, 1999 6:40 am

RE: How Hot Does Pitot

Sun Jan 28, 2001 2:12 am

If I remeber correctly the number of 180 degees F comes to mind.

JET
 
FDXmech
Posts: 3219
Joined: Sun Mar 19, 2000 9:48 pm

RE: How Hot Does Pitot

Sun Jan 28, 2001 3:48 am

Let me tell you a story, amazingly stupid but true.
One day when I was working for Continental EWR, I was assigned a job of replacing an angle of attack probe on an A300B4. This wasn't the type that looks like a moveable vane but resembles (for lack of a better description) a cigar probe sticking out of the forward fuselage.

Before removing this probe, I pulled the heater circuit breakers as was standard practice. Well, as can be expected the probe mount had several stripped out screws. I left the aircraft and went back to the hangar to get a drill and extraction tools to remove the bad screws. I returned to the airplane and got on the manlift to continue the job, unbeknownst to me, when I left, power was reapplied to the heater circuit for troubleshooting by someone else. I grabbed the probe and holy mackerel, all I saw was white in front of my eyes, it was so shockingly painful. My right hand received a 2nd degree burn in the image of the probe. I rushed back to the hangar and my lead stuck my hand in a bucket of freezing water and ice he got off an airplane. Whenever I took my hand out of the bucket, the pain would be excruciating. I was taken to the airport infirmary where my hand was treated. The kicker was with my poor aching hand I had to take a urine test.
You're only as good as your last departure.
 
Guest

RE: How Hot Does Pitot

Sun Jan 28, 2001 8:51 am

Pitot Heat Ramp story......

I guess that down in some states they have this bug called the Muddauber. Anyway these thing like building nests out of mud in tiny spaces. Like that little hole that is in the middle of a pitot tube. Anyway a lot of guys have the habit of blowing into that hole to check and see if that tube is plugged. Mechanics cringe at this practice of course. It isn't good for the gauges.

Anyway this guy was doing his walkaround and started inside the cabin. Anyway it was his habit to turn the breaker for the pitot heat off at this point and then do his outside walkaround, including blowing on the pitot tube. Well on this day he forgot to pull the breaker.

He reported had these two neat little half moon blisters on his lips for a coupe of days. One on each lip.
 
Guest

RE: How Hot Does Pitot

Sun Jan 28, 2001 9:00 am

It can burn your skin! The B767, for example, has lower heat on the ground than in flight, determined by the air/ground sensing system.
Many years ago I accidently grabbed a F86 pitot head while checking it for heat as I was about to put the cover on. I ended up with very bad burns as my hand stuck to it. Never again!!!
 
NKP S2
Posts: 1665
Joined: Mon Dec 20, 1999 3:16 am

RE: FDX Mech

Sun Jan 28, 2001 1:41 pm

Talk about a small world! Same thing happened to me but with the AOA vane in the PE/BA days...you may remember this. I was R&R-ing a 737 windshield in hangar 14... Outside on a none-too-steady BA ladder torqueing the screws. I lost my balance and freaked out...and grabbed ANYthing just to steady myself...Grabbed the AOA vane and smelled my own burning flesh and then felt the intense pain and saw the white mark. I might have been working with you, but I don't remember. Anyway, sorry to hear of your incident at Frank's place. Take care, Tom
 
XFSUgimpLB41X
Posts: 3960
Joined: Fri Aug 25, 2000 1:18 am

RE: FDX Mech

Sun Jan 28, 2001 3:35 pm

Chopper: if the pitot heat isnt turned on that thing will get very very cold....if the pitot heat is on..very very hot.
Chicks dig winglets.
 
Guest

RE: How Hot Does Pitot

Sun Jan 28, 2001 5:07 pm

It gets hot enough to if a human hand touches it, you'll be having the worst degree of burns there are! I've seen guys have inprints in their hand for life from touching it. It has to get warm enough to prevent ice from building up on it seeing as three of the major flight insturments are connected to it, the air speed indicator, the Altimeter. and the vertical speed indicator.
If you have a false reading on those due to ice or no reading at all, you're bumming big time
 
crjmech
Posts: 257
Joined: Wed Jun 07, 2000 6:31 am

RE: How Hot Does Pitot

Mon Jan 29, 2001 3:35 am

All the pitot tubes, static ports, AOA vanes, etc. I've ever dealt with get hot enough to cause burns almost instantly. On the CRJ, all the heated items are cold provided the aircraft is weight-on-wheels, neither of the engines are running (with IDGs on-line), and the heat switches are off. The exception are the ice detectors located on both sides of the forward fuselage. The detectors work by vibrating at a set frequency. Ice build-up changes the frequency and is sensed by the detector which triggers an ice warning in the cockpit and heats the ice detector. This is regardless of the aircraft's configuration; so long as the plane is powered-up, the detectors are active. Many a new mechanic has been burnt after grabbing an ice detector, puzzled by it's function. They get very, very hot very, very quickly.
Thou shalt mind thine altitude,lest the ground reach up and smite thee.
 
OldMan
Posts: 207
Joined: Thu Sep 28, 2006 7:38 am

RE: How Hot Does Pitot

Mon Jan 29, 2001 8:49 am

This is directed to the first reply Mr. Ihinhol

Why do you "puke" out your opinions when you do not know of what you speak? This reply only serves to polute the the text and show how uninformed you are? Think before jumping in son!
 
cdfmxtech
Posts: 1319
Joined: Wed Jul 05, 2000 11:37 am

RE: How Hot Does Pitot

Tue Jan 30, 2001 6:00 am

Let's just say this.
Touch one on the ground and you can rob a couple of banks and not get caught because of a fingerprint!!
 
wilcharl
Posts: 1151
Joined: Sun Jun 25, 2000 11:19 am

RE: How Hot Does Static Get

Tue Jan 30, 2001 9:15 am

does the static port not get as hot or am I just not senstive to heat? ive touched them and not gotten burnt, just warmed
 
me
Posts: 220
Joined: Sat Oct 21, 2000 4:57 am

RE: How Hot Does Static Get

Wed Jan 31, 2001 3:10 am

This is very embarrassing, but I don't know any of you so I'll tell the story.

I was a flight instructor at a tiny little general aviation airport right out of college in '93. A student of mine had his private pilot checkride scheduled at 9am at an airport about 25miles north of where the flight school was based. We met at the flight school at 7:30, he did the preflight and soon we were rolling down the runway in our C172 on our way to meet the FAA examiner.

On the takeoff roll, we never got an airspeed indication. I aborted the takeoff, had him taxi off the runway and into the runup area. "Must be some ice in the pitot tube" I said as he shut down the engine, "I'll be right back". I got out of the Cessna and very gently blew into the pitot tube. BIG MISTAKE!!

In the 3-4 minns that the pitot heat was on, the pitot tube got very hot, super hot. I was burnt pretty bad, picking up snow and pressing it against my lips. The good news was I cleared the pitot tube and the airspeed indicator worked fine. The bad news was I quickly developed two HUGE blisters, one on each lip.

I had a hard time explaining to people, who know nothing about airplanes or pitot tubes, what I did.
 Wow!

P.S. My student passes his ride with flying colors.

 
wilcharl
Posts: 1151
Joined: Sun Jun 25, 2000 11:19 am

RE: How Hot Does Pitot

Wed Jan 31, 2001 3:38 am

Now I dont feel so stupid for drinking the skydrol
 
NKP S2
Posts: 1665
Joined: Mon Dec 20, 1999 3:16 am

RE: How Hot Does Pitot

Wed Jan 31, 2001 6:19 am

Using ones lungs as a pitot/static test set...That's a good one Smile Wonder how many knots a good exhale is good for?
 
JETPILOT
Posts: 3094
Joined: Tue May 18, 1999 6:40 am

RE: How Hot Does Pitot

Wed Jan 31, 2001 6:43 am

LOL

I hope you didn't drink Skydrol....Did you? That would answer many questions.  Smile/happy/getting dizzy

JET
 
crjmech
Posts: 257
Joined: Wed Jun 07, 2000 6:31 am

The Taste Of Skydrol

Wed Jan 31, 2001 7:25 am

While I haven't actually ingested Skydrol, I did get a pretty good a taste of it once. It seems that while replacing some hydraulic widget I got some on my mini Maglite. Later on said flashlight ended up in my mouth. It tastes rather like that super-hot habenero pepper sauce. Not as spicy, but it stays with you for hours. Happily, my lips and tounge remained intact.
Thou shalt mind thine altitude,lest the ground reach up and smite thee.
 
chopper
Posts: 129
Joined: Mon Aug 08, 2005 12:16 am

RE: How Hot Does Pitot

Wed Jan 31, 2001 9:51 am

Thanks for the stories everyone . maybe this will keep me from touching pitot tubes before checking.
 
Guest

RE: How Hot Does Pitot

Wed Jan 31, 2001 11:50 am

NKP_S2 - a human sneeze is measured at 60 knots. Big grin

I think the respiratory tract warming system works somehow like the Pitot heat system?
 
HeavyCapt
Posts: 61
Joined: Mon Jan 15, 2001 5:00 pm

RE: How Hot Does Pitot

Thu Feb 01, 2001 6:13 pm

Hot enough to cause 2nd degree burns by momentarily touching it and 3rd degree burns if you actually "grab" it. That folks......I learned the hard way

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