Mnemonics and Main Memory Items | Meteorology 2

Question 1

True altitude corrects -

Density altitude corrects -

Answer 1

Indicated altitude for temperature error

Pressure altitude for non-standard temperature

Question 2

Formula for true altitude -

Answer 2

4% for each 10 degrees ISA deviation.

Also, you need to correct for pressure if needed. If the QNH is lower than standard(lower pressure exist, the altimeter will over-read, you need to subtract from PA), if higher (higher pressure, altimeter will under-read, you need to add to PA).

Just remember hot to cold, don’t be bold. High to low, look down below.

Question 3

You plan a flight over a mountain range at a true altitude of 15000 FT/AMSL. The air is on an average 15°C colder than ISA, the pressure at sea level is 1003 hPa. What indication must the altimeter (setting 1013.2 hPa) read?

A
15690 FT

B
16230 FT

C
14370 FT

D
13830 FT

Answer 3

B

16230 FT

Question 4

The QNH of an airport at sea level is 983hPa and the temperature deviation from ISA is -15°C below FL 100. What is the true altitude of FL 100?

A
8590 FT

B
10210 FT

C
9790 FT

D
11410 FT

Answer 4

A

8590 FT

Question 5

What is the formula to convert Fahrenheit to Centigrade?

A
(°F − 32) × 9/5

B
(°F − 32) × 5/9

C
(°F + 32) × 5/9

D
(°F - 32) + 5/9

Answer 5

B

(°F − 32) × 5/9

Question 6

What is the formula to convert Centigrade to Fahrenheit?

A
(°C × 9/5) + 32

B
(°C × 9/5) - 32

C
(°C − 32) × 5/9

D
(°C × 5/9) + 32

Answer 6

A

(°C × 9/5) + 32

Question 7

The DALR:

The SALR:

The ELR:

Answer 7

3 degrees/1 000ft or 1 degree/100m
1.5 degrees/1 000ft or 0.6/100m
2 degrees/1 000ft 0r 0.65/100m

Question 8

Conditional instability occurs when -

Answer 8

DALR > ELR > SALR