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Questions tagged [pitot-static]

A pressure-based system for measuring airspeed and altitude

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How does a G1000 equipped with a GDC 74 calculate IAS from dynamic pressure?

How exactly does a G1000 system equipped with a GDC 74 air data computer calculate the indicated airspeed that is displayed on the PFD from difference between the total and static pressure (i.e. ...
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1answer
72 views

Pitot tube model

EDIT: Background on my application I am making a few measurement models for an extended Kalman filter (EKF). The EKF is meshing an INS and a GPS currently, but the GPS update rate does not update ...
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2answers
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Pitot tube pressure question

I have this question is the pressure measured in the entry of the pitot tube the same when the plane is flying headwind or turning a 360 degree turn while maintaining the same indicated airspeed?
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2answers
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Do any aircraft automatically test that the pitot-static system is functioning properly before liftoff?

Given that a properly-functioning pitot-static system is absolutely essential for flight (a plane cannot be flown without valid airspeed data, or at least not for long), are there aircraft that ...
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2answers
142 views

Static port and Bernoulli [duplicate]

Static ports open directly to the outside of fuselage. When aircraft is flying, there will be air flowing outside of static port. How does this not cause a vacuum effect inside the static port. Due to ...
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5answers
689 views

What does the Airspeed indicator show when your pitot tube is blocked?

So the question in the topic. I want to clarify whether the speed indications is maintained or go to 0.
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1answer
254 views

Which company manufactures the air data system on the Boeing 787-9 'Dreamliner'

I'm asking specifically about the manufacturer and model of the Pitot probes/tubes that provide the pilots with current air speed readings. Pretty sure it's either UTC or Honeywell but can't find ...
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Does the pressure at the static ports drop as the aircraft's speed increases?

This answer by Tyler Durden explains what static ports are and how they work: The "static ports" allow air into the instrument to provide the input for the air pressure on the side of the aircraft. ...
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1answer
660 views

Is it possible to totally override the flight computer on the Airbus A320-family (in simple non-technical terms)?

As I know, in the autopilot oriented airplanes like an A321 the plane doesn't let the pilots pitch down when the plane gets an over-speed warning. So what if the pitot-static system isn't working ...
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477 views

Where exactly are the pitot tubes positioned on the A330/340?

While going through a document for analysis I came across a statement saying the positions 1 and 2 of the pitot probes are symmetrical on long-range Airbus aircraft but not on their single-aisle ...
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1answer
387 views

How is the static pressure in the pitot static system reconciled when there are two outside static pressure ports?

On airplanes where there are two static pressure sources (ports) on each side of the fuselage what is the result of the static pressure as compared to aircraft with a single port. (I'm not talking ...
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1answer
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What additional functionality is provided by the F-14 nose pitot, absent in early models?

Early model F-14A had no nose pitot: ... but they seem to have quickly acquired them sometime in the late 1970s. The Iranian F-14s have them, and it's quite hard to find a picture of an F-14 without ...
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2answers
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Why does the Boeing 737 have a pitot tube on the tail?

From this link: Can anyone explain why the Boeing 737 has a pitot tube for the elevators? Wouldn't the airspeed be measured the same from the front of the airplane and the tail? Is the airspeed ...
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What is the meaning of “static pressure”?

I don't really know what static pressure is. Does the ASI (Airspeed Indicator) use cockpit pressure as static pressure, to find the dynamic or differential pressure? I just found this statement : ...
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2answers
194 views

How does the mechanical linkage of the airspeed indicator convert dynamic pressure to KIAS?

I understand the underlying principle of an airspeed indicator, ie. that it uses the Pitot-static system to measure the dynamic pressure as the difference between total pressure and static pressure. ...
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1answer
551 views

When was the pitot-based ASI first used on aircraft?

The pitot was first invented well before aircraft, yet early aircraft lacked an airspeed indicator (ASI). What aircraft first had a pitot-based ASI, and when?
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578 views

Why can the aircraft not turn on pitot heaters itself?

There have already been some posts about pitot heaters: when to turn them on/off, why not leave them on etc. I don't want to go over that. I am an engineer, so I'd like to ask: if the flight ...
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1answer
561 views

What would be the effects of installing pitot tubes on the engine covers?

What are the effects on airspeed measurements, if the pitot tubes were installed right on the engine covers of an aircraft instead of being on the nose. Would the reading be false? If so, would the ...
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1answer
256 views

How does an ADIRU convert ram air pressure from the Pitot tube into Airspeed?

I know how the analog Airspeed Indicator shows the Airspeed from the ram air pressure from the pitot tube. But I'd like to know how an ADIRU converts the raw pressure data to Airspeed that is ...
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6answers
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Is it possible to accurately measure airspeed without pitot tube?

This is a follow-up to my previous question: How does this IMU work and how to convert its output into meaningful information? for which many people asserted that I need a pitot tube and a static ...
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1answer
954 views

How to calculate the static pressure in a pitot tube?

In a pitot-static tube, we have two different pressure, the static pressure $p_s$ and the total pressure $p_0 = p_s + \frac{1}{2}\rho v^2$, which comes from the Beroulli equation for incompressible ...
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What were the safety recommendations following the Aeroperú Flight 603 crash?

I just watched the Mayday Air Crash Investigation about Aeroperú Flight 603 and two questions that weren't answered are: Who was responsible What caused the ATC to relay false altitude information to ...
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1answer
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Are there typical values of pitot-static and TAT probe measurement uncertainties?

I'm working on flight sensors for a project and I'm supposed to model noise in the Static Port, Pitot tube, and TAT probe measurements. I looked a lot for it online and could not get a convincing ...
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Why does indicated airspeed change with altitude?

I know that if you fly at a low altitude and at a high altitude at the same TAS, your IAS will be lower at the high altitude than at the low altitude. Why is this though? Wouldn't the static vent ...
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0answers
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What may cause a pitot tube and Honeywell pressure sensor calibration inconsistency?

It is possible that my issue is specific to my setup, but I thought I'd try here if someone has experienced a similar issue. I will try to explain this clearly as possible, but it may be slightly ...
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2answers
2k views

What is the difference between a pitot tube and a pitot-static tube?

What is the difference between a Pitot tube and a Pitot-static tube? If an aircraft fitted with Pitot tube and static holes on the fuselage, is it necessary to consider the static pressure ...
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1answer
533 views

Why are some pitot tubes more prone to icing than others?

I understand that there were several cases pitot tube failure in a certain way. The pitot tubes were clogged by ice when the airplane was in cold and wet conditions. The remedy was to exchange the ...
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1answer
470 views

Why are static ports external on a non pressurized aircraft?

Seems like the intruments in a non pressurized aircraft have access to the static pressure right where they are. It seems like external ports would be subject to more error being exposed, and lines ...
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1answer
2k views

What temperature are Pitot Tubes heated to?

What temperature is a pitot tube usually heated to prevent ice? And are pitot tubes always heated to the same temperature, is there any difference between aircraft (say, a C172 and an A321)?
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Why not have Pitot Heat always on?

Most (all?) aircraft have a Pitot Heat Switch which must be turned on in certain conditions. Seems Pitot Heat is one of those things you don't want to forget to switch on when it's needed, or worse, ...
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1answer
291 views

How does Pitot Heat influence airspeed indication (assuming no ice or moisture)?

Should Pitot Heat ON (in dry weather conditions) decrease airspeed indication because warmer (so less dense) air flows through the tube?
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2answers
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What alternatives to pitot static systems are available or in development?

Air France 447 is a powerful example of what a serious situation unreliable air data indications can be if not handled properly by a crew. Still, whether crews are properly trained or use that ...
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Why does the Lockheed D-21B have three air data probes?

The Lockheed D-21 has three air data booms / pitot intake tubes: one on the nose and one on each wing. (Images here and here.) All three appear to be pitot-static tubes. Anyone know what purpose ...
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2answers
467 views

How does a Machmeter behave if the static port is blocked during a constant CAS climb?

Question: How will the machmeter behave in a constant CAS climb if the static source becomes blocked? Answer: The machmeter reading will decrease. Why? I couldn't find any logical reason for the ...
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1answer
808 views

How does headwind influence the results of a pitot tube and therefore the airspeed indicator?

What I know so far I recently read about pitot tubes and their use in aircraft. For the basics I consulted Wikipedia, and also went through the definitions for airspeed, groundspeed, and the various ...
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1answer
462 views

How does the static pressure system keep the ambient pressure?

I understand that the compressed airflow around the aircraft effectively lowers the air pressure, and that's the reason why the alternate air switch affects your altimeter ­­— it uses the slightly ...
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1answer
173 views

How easy is it to make a connection to the aircraft pitot-static system?

I've recently discovered the device named Levil 2 AW which gives complete navigation functionalities, including Air Data computations once it is connected to the pitot-static system. In this regard, ...
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Is it possible to detect a pitot static failure (blockage) of air data probe during flight and alert the pilot?

Loss of static and pitot tubes affect the display of airspeed, altitude, vertical speed information. Loss of this information can be catastrophic for flight. How are the pilots communicated about the ...
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How can a pitot tube freeze when it's heated?

Reading Why turn off pitot tube heating?, it appears that the pitot tube heat can be switched off to extent its lifetime and also in case of short-circuit. (Thales pitot-static probe, source BEA) On ...
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4answers
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Which air stream pressure / speed is measured by the pitot?

The pitot tube is used to measure the air pressure later converted into air speed. However air pressure varies according to several elements, including the location related to the wing: (Source: av8n....
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1answer
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When is compressibility a problem for a pitot tube?

One of the errors for a pitot tube is 'compressibility.' However, I don't understand this in detail. I get that the ASI will read slower because the ram air is compressing against the air already in ...
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What steps have been taken to rule out instrument failure due to blocked static ports or pitot tubes?

In the case of Aeroperu Flight 603, a fatal crash was caused by duct tape that was accidentally left over some or all of the static ports on the underside of the fuselage after the aircraft was ...
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1answer
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How does a pitot plate work?

I understand the basic concept of the pitot tube in that it measures the air pressure coming into the tube in order to compare it to a static pressure measured elsewhere on the aircraft. The B-2 ...
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407 views

What is the standard procedure in case of inconsistent sensor readings?

After reading the answers I now know there are three independent sensors. I will leave the question as-is, to not take the answers out of context: I do remember reading that airliners have two ...
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1answer
4k views

How can I check pitot static leak without a test box?

More than once on the ramp, I've wished I could check an aeroplane's pitot-static system for leaks, but I didn't have the test box. I've since seen, in the FAA's handbook for checking homebuilts, a ...
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Why don't airliners have a navigation GPS as back up in case of a pitot tube malfunction? [duplicate]

Why don't airliners have a navigation GPS as "back up" in case of a pitot tube malfunction? Aeropero 603 and Air France 447 plus many other im sure, could have been saved if these aircrafts would have ...
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How is the pitot/static system of a helicopter affected by rotor downwash?

Since the fuselage of a helicopter is affected by downwash from the rotors, how is the pitot static system affected?
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1answer
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How is the pitot system drained?

Since pitot static systems are open the outside, how does the system remain clear of water or other contaminants?
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10k views

Why turn off pitot tube heating?

I'm merely an amateur simulator (X-Plane) pilot. On a flight yesterday the airspeed indicator stopped working. After the initial panic I remembered reading something about pitot tubes freezing, found ...
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3answers
6k views

How does an A330 detect stall without airspeed?

On Air France 447 the crew had experienced complete failure of the pitot static system, which meant they lost their readings on their airspeed indicators, but according to the Mayday / Air Crash ...