Pitotstatic and instruments

Question 1

What type of pressure comes from the pitot probes?

Answer 1

Combination of dynamic and static pressure

Question 2

Which pressure port(s) connect to the VSI?

Answer 2

Static

Question 3

Which port(s)connect to the ASI?

Answer 3

Pitot and static

Question 4

Which port(s) connect to the altimeter?

Answer 4

Static

Question 5

How does a mechanical ASI work?

Answer 5

The static pressure from the static port fills the case while the combined pressures from the pitot probe fills the bellows. This causes the static pressure in the bellows to be cancelled out by the pressure in the case leaving the dynamic pressure to expand/contract the bellows and move the needle on the gauge to the correct airspeed.

Question 6

How would electronic instruments get the same information as their mechanical variants?

Answer 6

The same pressure inputs would be sent to the pressure relevant pressure sensors for the air data computer which would convert the input data into digital signals through the CPU to send to the display.

Question 7

How does a mechanical altimeter work?

Answer 7

The static pressure is sent into the airtight case and used to expand/contract the 2 aneroid diaphragms as the pressure increase or decreases. This drives the gear train to move the pointer around the gauge.

Question 8

Why would an altimeter need to be corrected during flight?

Answer 8

To change between standard BARO altitude and airport altitude

Question 9

How does a VSI work?

Answer 9

The static proof input fills the both the diaphragm and the case, but the case as a calibrated leak that restricts airflow. As the aircraft climbs or descends the pressure in the diaphragm changes almost immediately with the change in altitude while the case takes longer to change due to the calibrated leak. This differential pressure causes the bellows to expand/contract and move the needle to move in the relevant position on the gauge.

Question 10

How many static and pitot inputs does the elevator feel computer receive?

Answer 10

2 of each

Possibly 1 pitot if there are only 3 pitot probes in total

Question 11

Are the static ports on either side of the fuselage connected?

Answer 11

Yes

Question 12

Which static and pitot ports connect to the RAT?

Answer 12

Alternate static ports

Auxiliary pitot port

Question 13

What is the barometric (BARO) pressure at sea level?

Answer 13

1013.2 mb