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Flashcards in ICAO ISA Deck (12)
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1

Mean sea level (MSL) temp

+15°C

2

Positive lapse rate MSL - 11km

1.98°C/1000ft (approx 2°C)
6.5°C/km

3

Lapse rate 11-20km

Isothermal
-56.5°C (lowest ISA temp)

4

Neg. lapse rate 20-32km

0.3°C/1000ft (due to O3)
1°C/km

5

Jet Standard Atmosphere (JSA)

2°C/1000ft (all the way through)

6

MSL pressure

1013.25 hPa
29.92 inches of Hg

7

Average lapse rate MSL pressure

27ft/hPa (approx 30ft)
8m/hPa

8

Average lapse rate at 18,000ft pressure

50ft/hPa
15m/hPa

9

MSL density

1225gm/m3

10

Half density

20,000ft

11

Half atmosphere height

18,000ft (500hPa)
5.5 km

12

Tropopause

36,080ft
11km