how instruments use the pitot static & bloackage

Question 1

how the altimeter use the pitot tube/ ram air and the static port

Answer 1

impact air into the pitot tube creates ram air pressure and the static port measures the ambient air pressure

then the difference, specifically impact air MINUS static pressure = dynamic pressure (aka airspeed)

Question 2

how does the vsi work

Answer 2

it uses the static port to measure static pressure. it measures changes in static pressure and how fast those changes are happening to calculate rate of climb (or descent)

Question 3

how does the altimeter work

Answer 3

it uses the static port to detect changes in density. as you go higher in the atmosphere, density decreases. therefore if the static port receives lots of density it means the aircraft is at lower altitudes, if the static port receives less dense air it means the aircraft is at higher altitudes

Question 4

what instruments use the static port

Answer 4

altimeter, vertical speed indicator, & airspeed

Question 5

which instrument uses the pitot tube

Answer 5

airspeed

Question 6

what happens if the pitot tube is blocked

Answer 6

ONLY AIRSPEED IS AFFECTED
two situations
- air inlet blocked BUT drain hole is open
OR
- air inlet AND drain hole blocked

Question 7

what happens if only the pitot tube AIR INLET is blocked

Answer 7

ONLY AIRSPEED AFFECTED

airspeed will drop to zero

Question 8

what happens if the pitot tube AIR INLET and DRAIN HOLE are blocked

Answer 8

ONLY AIRSPEED IS AFFECTED

the air speed indicator will act like an altimeter and is no longer reliable

Question 9

what happens if the static port is blocked

Answer 9

altimeter (*), airspeed (~) and vertical speed (#) are ALL AFFECTED

Question 10

what happens if the static port is blocked (*)

Answer 10

altimeter is one instrument that is affected

it will freeze on the altitude where it was blocked

Question 11

what happens if the static port is blocked (~)

Answer 11

airspeed is one instrument affected

• only indicates correctly AT BLOCKAGE ALTITUDE
• at higher altitudes = airspeed indicates LOWER then it should
• at lower altitudes = airspeed indicates HIGHER then it should

Question 12

what happens if the static port is blocked (#)

Answer 12

vertical speed is one instrument affected

vsi drop to and freeze on zero

Question 13

what happens when you use an alternate static source

Answer 13

a lower static pressure is measured

airspeed = indicates a FASTER speed then it should
altimeter = indicate HIGHER then it should
vsi = momentarily shows a climb