If the altimeter setting drops 0.15 inHg, how much will pressure altitude change?

Prepare for your Mental Math for Pilots Test. Utilize quizzes with multiple-choice questions, all featuring hints and explanations. Ace your exam!

Multiple Choice

If the altimeter setting drops 0.15 inHg, how much will pressure altitude change?

Explanation:
Pressure altitude shifts in direct proportion to changes in the altimeter setting. Roughly, 1 inHg change equals about 1000 ft. A drop in the altimeter setting of 0.15 inHg means the difference (29.92 − QNH) increases by 0.15, so the pressure altitude increases by 0.15 × 1000 ≈ 150 ft. Using PA = Elevation + (29.92 − QNH) × 1000 helps see this: lower QNH (the setting) raises the PA by the corresponding amount. A 0.30 inHg change would give about 300 ft, but a 0.15 inHg change yields about 150 ft.

Pressure altitude shifts in direct proportion to changes in the altimeter setting. Roughly, 1 inHg change equals about 1000 ft. A drop in the altimeter setting of 0.15 inHg means the difference (29.92 − QNH) increases by 0.15, so the pressure altitude increases by 0.15 × 1000 ≈ 150 ft.

Using PA = Elevation + (29.92 − QNH) × 1000 helps see this: lower QNH (the setting) raises the PA by the corresponding amount. A 0.30 inHg change would give about 300 ft, but a 0.15 inHg change yields about 150 ft.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy