The Moving Medium: All About Air

Question 1

OAT

Answer 1

Outside Air Temperature

Question 2

What’s the difference between altitude and height?

Answer 2

Altitude is: Above sea level (ASL)
Height is: Above ground level (AGL)

Question 3

CAR

Answer 3

Canadian Aviation Regulation

Question 4

Air Law CAR 605.31 (1)

Answer 4

Oxygen requirements:
- 10,000’ ASL, supplemental oxygen for all crew for 30 minutes along with 10% of passengers
- 13,000’ ASL, supplemental oxygen full time

Question 5

What is a Datum?

Answer 5

A reference point

Question 6

ISA

Answer 6

International Standard Atmosphere

Question 7

What are the compositions of air?

Answer 7

• Nitrogen (N2) 78%
• Oxygen (O2) 21%
• Carbon Dioxide (CO2) 0.4%
• Other Gases 0.96%

Question 8

What are some properties of air?

Answer 8

• Air has weight
• Air is fluid
• Air always moves from high to low pressure
• Air is viscous
• Air thins at a higher altitude due to gravity

Question 9

AGL

Answer 9

Above Ground Level

Question 10

ASL

Answer 10

Above Sea Level

Question 11

Hg

Answer 11

Mercury

Question 12

ISA Lapse Rate

Answer 12

• 1” Hg/1000’
• 2°C/1000’

Question 13

ISA Barometric Pressure

Answer 13

29.92” Hg

Question 14

ISA Temperature

Answer 14

15°C

Question 15

ISA Altitude

Answer 15

Sea Level

Question 16

KTAS

Answer 16

True Air Speed

Question 17

GPH

Answer 17

Gallons Per Hour

Question 18

What is less dense, moist air or dry air?

Answer 18

Moist air is less dense because water vapor molecules replace the heavier nitrogen and oxygen molecules in the atmosphere.

Question 19

PA

Answer 19

Pressure Altitude

Question 20

How do you calculate PA?

Answer 20

((29.92 - Barometric pressure) x 1000) + cruise altitude)

Question 21

What is the atmospheric pressure at sea level?

Answer 21

14.7 PSI