Chapter 5.5 - Exam Review

Question 1

Why does Density decrease with decreasing Temperature as an Aircraft climbs?

Answer 1

Because the rate of decreasing Pressure is greater than the decreasing Temperature.

Question 2

Define Height?

Answer 2

The vertical dimension of an object.

Question 3

With regards to Altimetry, what is the essential element before Aircrafts can use their Altimeter for vertical separation?

Answer 3

That all Aircrafts are using the same Pressure-Datum settings.

Question 4

How can a Pilot obtain the Local QNH at an aerodrome when sitting in the cockpit of an Aircraft on the ground?

Answer 4

By using the Pressure-Datum adjuster to read the elevation of aerodrome.

Question 5

What is Pressure Height?

Answer 5

The height above sea level in ISA or 1013 hPa.

Question 6

How does a Pilot determine the Pressure Height when in the cockpit of an Aircraft?

Answer 6

By setting the Pressure-Datum subscale to read 1013 hPa.

Question 7

An Aircraft is cruising at 6,500 ft on an Area QNH of 1002 hPa. What is the Pressure Height?

Answer 7

• ANSWER = 6,830 ft.
• Add 11 hPa to get 1013 hPa.
• 11 x 30 = +330 ft.
• 6,500 + 330 = 6,830 ft/7,000 ft (to the nearest 500 ft)

Question 8

How is the ISA temperature found at any particular level?

Answer 8

+15°C + (PH / 1000 x 2°C).

Question 9

Convert -10°C to °F?

Answer 9

• ANSWER = +14°F.

- -10°C x (9 / 5) + 32.

Question 10

Convert +5°F to °C?

Answer 10

• ANSWER = -15°C.

- +5°F – 32 x (5 / 9).

Question 11

Define Density Height?

Answer 11

Pressure Height corrected for any difference between the actual temperature and ISA.