Atmosphere Zones

Question 1

Physiologic Zone

Answer 1

Sea level to 10,000 MSL

Question 2

Night Vision is decreased beginning at

Answer 2

5,000 MSL

Question 3

Physiologically deficient zone

Answer 3

10k to 50k ft MSL

Question 4

Oxygen or pressurization required to survive above

Answer 4

10k

Question 5

If in a pressurized cabin and a sudden decompression occurs in the physiologically deficient zone, time of useful consciousness (TUC) is:

Answer 5

cut in half

Question 6

A sign of compression loss is:

Answer 6

cooler temps in the cabin and windows fogging

Question 7

There is normally 90 sec of useful consciousness at

Answer 7

30k ft

Question 8

If a rapid decompression occurs at 30K ft, TUC is now around

Answer 8

45 sec

Question 9

Space Equivalent Zone

Answer 9

> 50k ft

Question 10

Oxygen adjustment calculation

Answer 10

(FiO2 x P1)/P2 = FiO2 required for ascent

Question 11

FiO2 =

Answer 11

fraction of inspired oxygen

Question 12

P1 =

Answer 12

the pressure you are at (on the ground)

Question 13

P2 =

Answer 13

the pressure you are flying to (cruising altitude)

Question 14

Pressure (P) values

Answer 14

torr and mmHg are essentially the same thing

Question 15

Sea level value

Answer 15

760 torr or mmHg (1 ATM)

Question 16

10k ft. MSL P value

Answer 16

523 torr or mmHg

Question 17

18k ft. MSL P value

Answer 17

380 torr or mmHg (1/2 ATM)

Question 18

63k ft. MSL P value

Answer 18

0 torr or mmHg (0 ATM)

Question 19

Example O2 adj. calc.: Patient on NRB at 0.5 FiO2 @ sea level. Flying to altitude with torr 500. What will be the O2 requirement at this pressure?

Answer 19

0.5 x 760/500 = 0.76 FiO2 required for ascent (76% O2)