ICAO ISA Flashcards by Victoria Johnson | Brainscape

Q

Mean sea level (MSL) temp

A

+15°C

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Q

Positive lapse rate MSL - 11km

A

98°C/1000ft (approx 2°C)

6. 5°C/km

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Q

Lapse rate 11-20km

A

Isothermal

-56.5°C (lowest ISA temp)

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Q

Neg. lapse rate 20-32km

A

0.3°C/1000ft (due to O3)

1°C/km

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Q

Jet Standard Atmosphere (JSA)

A

2°C/1000ft (all the way through)

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Q

MSL pressure

A

25 hPa

29. 92 inches of Hg

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Q

Average lapse rate MSL pressure

A

27ft/hPa (approx 30ft)

8m/hPa

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Q

Average lapse rate at 18,000ft pressure

A

50ft/hPa

15m/hPa

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Q

MSL density

A

1225gm/m3

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Q

Half density

A

20,000ft

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Q

Half atmosphere height

A

18,000ft (500hPa)

5.5 km

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Q

Tropopause

A

36,080ft

11km

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