If the altimeter is 29.89, what is the lowest usable flight level?

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Multiple Choice

If the altimeter is 29.89, what is the lowest usable flight level?

Explanation:
Instruments use a standard pressure setting of 29.92 for flight levels. When the local altimeter setting is lower than standard, the true altitude corresponding to a given flight level is reduced. Here, the local setting is 29.89, so the difference is 29.92 − 29.89 = 0.03 inHg. About 1000 ft of altitude corresponds to 1 inHg, so 0.03 inHg ≈ 30 ft. For a flight level, true altitude is roughly the flight level times 1000, minus that 30 ft offset. - For the level corresponding to 18,000 ft pressure altitude: true altitude ≈ 18,000 − 30 = 17,970 ft (below 18,000). - For the level corresponding to 19,000 ft: true altitude ≈ 19,000 − 30 = 18,970 ft (above 18,000). Therefore, the first level that ensures at least 18,000 ft true altitude is the one at 19,000 ft pressure altitude—FL190.

Instruments use a standard pressure setting of 29.92 for flight levels. When the local altimeter setting is lower than standard, the true altitude corresponding to a given flight level is reduced.

Here, the local setting is 29.89, so the difference is 29.92 − 29.89 = 0.03 inHg. About 1000 ft of altitude corresponds to 1 inHg, so 0.03 inHg ≈ 30 ft. For a flight level, true altitude is roughly the flight level times 1000, minus that 30 ft offset.

  • For the level corresponding to 18,000 ft pressure altitude: true altitude ≈ 18,000 − 30 = 17,970 ft (below 18,000).

  • For the level corresponding to 19,000 ft: true altitude ≈ 19,000 − 30 = 18,970 ft (above 18,000).

Therefore, the first level that ensures at least 18,000 ft true altitude is the one at 19,000 ft pressure altitude—FL190.

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