Pitot – Static Instruments & Blockages

Question 1

Pitot Static System (What parts & instruments)

Answer 1

-Contains Ram air port, drain hole (pitot tube), and the pitot static source
-Instruments dependent: Vertical Speed, Airspeed, and Altitude

Question 2

Vertical Speed

Answer 2

Has a diaphragm and a calibrated leak. Air goes through the casing (calibrated leak) which slows the air coming in and that is compared to the diaphragm air to give vertical speed.

Question 3

Airspeed

Answer 3

Has a diaphragm that compares the Ram air from the diaphragm to the Static air from the casing to give us dynamic pressure (airspeed)

Question 4

Altimeter

Answer 4

Contains an aneroid wafer (set pressure of 29.92) that gets information from a static source that goes to the casing, the wafer expands and contracts as pressure changes

Question 5

Ram Air Blockage

Answer 5

Airspeed will indicate 0

Question 6

Drain Hole & Ram Air Blockage

Answer 6

Airspeed will work similarly to the altimeter

Question 7

Static Source Blockage

Answer 7

Airspeed will act as a reverse Altimeter, Vertical Speed and Altimeter do not read.

Question 8

What to do if there is a blockage (i.e icing)

Answer 8

-Pitot heat
-Descend
-Use alternate static

Question 9

GI 275 (standby) Battery & ADC/AHRS

Answer 9

-1hr if the electrical system fails (own power)
-Own ADC & AHRS

Question 10

What Vaccum Pump do we have

Answer 10

Engine driven

Question 11

How does the vacuum system work for the attitude indicator

Answer 11

The engine creates a vacuum, rigidity in space wants to keep the gyro spinning where it is. Two gimbals around the gyro allow us to rotate around it (aka what is shown) (horizontally)

Question 12

How does the vacuum system work for the HSI indicator

Answer 12

The engine creates a vacuum, rigidity in space wants to keep the gyro spinning where it is. One gimbal around the gyro allow us to rotate around it (aka what is shown) (vertical)