Pitot Static Blockages

Which of the following best describes how the Airspeed Indicator works?

A diaphragm expands as it is filled with static pressure from the aircraft's surroundings

A calibrated leak helps the Airspeed Indicator measure the difference between the dynamic pressure of the pitot tube and static pressure from the static port

The Airspeed Indicator's aneroid wafer expands and contracts with altitude due to pressure being lower at higher altitudes

The Airspeed Indicator effectively compares total pressure and static pressure for airspeed indication

Which of the following best describes the effects of an alternate static source?

A) Alternate static source in the Piper Archer uses air from the cabin, so it has the airspeed indicator and altitude indicator read higher than normal because the air temperature is lower than outside.

B) Alternate static source in the Piper Archer uses air from the exhaust, so it has the airspeed indicator and altitude indicator read higher than normal because the air temperature is higher than outside.

C) Alternate static source in the Piper Archer uses air from the outside, so it has the airspeed indicator and altitude indicator read lower than normal because the air temperature is lower than outside.

D) Alternate static source in the Piper Archer uses air from the cabin, so it has the airspeed indicator and altitude indicator read higher than normal because the air temperature is higher than outside.

Which of the flight instruments are affected by pitot tube blockage assuming the static port of the airplane is on the fuselage?

A) Altimeter

B) Vertical Speed Indicator

C) Airspeed Indicator

D) Heading Indicator

How is the analog altimeter able to detect changes in pressure from the altitude it is at?

A) It utilizes a network of miniature barometers attached to mechanical gears

B) It relies on a diaphragm to detect pressure variations. The diaphragm expands as the airplane climbs.

C) It employs a calibrated leak to measure altitude changes. This prevents the instrument from exploding at high pressures.

D) It uses an aneroid wafer to sense altitude fluctuations. It is like a bag of potato chips taken to altitude.

What will happen to the airspeed indicator if the ram hole of the pitot tube becomes blocked but the drain hole remains open during a descent from 3,500 to 2,600?

A) The airspeed indicator will drop to around zero.

B) The airspeed indicator will show a higher than actual airspeed.

C) The airspeed indicator will show a lower than actual airspeed.

D) The airspeed indicator will freeze at its current reading.

What will happen to the airspeed indicator if the ram hole and drain hole of the pitot tube become blocked during a descent from 3,500 to 2,600?

A) The airspeed indicator will drop to around zero.

B) The airspeed indicator will show a higher than actual airspeed

C) The airspeed indicator will show a lower than actual airspeed.

D) The airspeed indicator will freeze at its current reading.

Your altimeter seems to be frozen while your airspeed continues to increase. Your VSI is still stuck saying +100. What is going on?

The drain hole has frozen over and you are maintaining straight-and-level flight

The static port has become blocked and you are descending

The static port has become blocked and you are climbing

The static port and the drain hole have become blocked, but the ram hole is still open. You are climbing.

Your airspeed continues to decrease towards stall speed. You hear "Pull Up." What happened?

There is a blocked pitot and drain hole that the pilot was not aware of. He or she then pitched down to avoid a stall.

There is a blocked pitot and drain hole that the pilot was aware of. He or she then tried climbing, but could not climb fast enough.

There is blocked pitot, but open drain hole that the pilot was not aware of. He or she then pitched down to avoid a stall.

There is a blocked static port, so the pilot decided to descend to melt the ice.

How will the VSI act if there is a blocked static port obtained during cruise?

It will show a climb

It will show a descent

It will show zero

It will show a climb, but with a negative rate

Which of the following best describes the Vertical Speed Indicator?

Uses the concept of dynamic pressure

Consists of a stack of evacuated, corrugated bronze aneroid capsules whose thickness changes as the air pressure changes and this drives dials

Both the inside of its aneroid and the inside of its instrument case are vented to the static system

If the indication is off by more than 75 feet from the surveyed elevation, the instrument should be referred to a certificated instrument repair station for recalibration

What will happen to the airspeed indicator if the static port becomes blocked during a descent from 3,500 to 2,600?

A) The airspeed indicator will drop to around zero.

B) The airspeed indicator will show a higher than actual airspeed

C) The airspeed indicator will show a lower than actual airspeed.

D) The airspeed indicator will freeze at its current reading.

When would the airspeed indicator freeze at its current reading during a descent from 3,500 to 2,600?

The airspeed indicator would freeze at its current reading if the outside air temperature is below freezing (0°C or 32°F) during the descent.

The airspeed indicator would freeze at its current reading if the aircraft enters a cloud layer with supercooled water droplets during the descent and just the static port becomes blocked.

The airspeed indicator would freeze at its current reading if just the pitot tube (ram hole only)becomes blocked by ice during the descent.

The airspeed indicator would freeze at its current reading if the static port and pitot tube (drain hole and ram hole) becomes blocked by ice during the descent.

How can you best verify a pitot-static blockage?

Open the alternate static source and check to see if the instruments agree with each other again?

Declare an emergency and attempt to fly back to Grand Forks

Look outside and see icing has started to accumulate on the door stop

Descend to see if you can get to warmer temperatures and get rid of the ice

If you do not have an alternate static source, how can you respond in the event of blocked static port?

Break the windshield so instruments get static pressure that way

Open the storm window so instruments can sense outside air pressure

Break the magnetic compass as it is the least essential instrument

Break the VSI as it is the least essential instrument

What is the role of the calibrated orifice in the Vertical Speed Indicator?

A) The calibrated orifice in the Vertical Speed Indicator is responsible for measuring altitude changes.

B) The calibrated orifice controls the flow of air into the altimeter to determine vertical speed.

C) The calibrated orifice is used to maintain static pressure for the Vertical Speed Indicator.

D) The calibrated orifice restricts the rate of air pressure change, allowing the instrument to display the rate of climb or descent.

You are flying a diverse departure when your airspeed indicator show a bright red "x" on the PFD. The altimeter and VSI soon also show a red "x". What failed in the G1000?

GDL 59

Garmin Integrated Avionics Unit

Garmin Air Data Computer

Garmin Attitude and Heading Reference System

You are cruising in turbulence inside of a cloud at altitude. The airspeed indicator was oscillating and now has frozen over. The VSI still shows 0 fpm, and the altimeter is at your assigned flight level. What happened?

There is a blocked pitot tube but open drain hole

The ADC has failed

The static port is definitely not blocked

There is not enough information to answer this question

Pitot Static Blockages

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