INRAT Instrument Rating · Question
According to CAR 605, what is the maximum permissible altimeter error when comparing reported field elevation to the altimeter setting with the current local altimeter setting?
CAR 605.36 states that the altimeter must display the aerodrome elevation within 75 feet of the published elevation when set to the local altimeter setting. How
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Question: According to CAR 605, what is the maximum permissible altimeter error when comparing reported field elevation to the altimeter setting with the current local altimeter setting?
Answer options:
- ±75 feet ✅ ±50 feet
- ±25 feet
- ±100 feet
Correct answer: ±50 feet
Explanation: CAR 605.36 states that the altimeter must display the aerodrome elevation within 75 feet of the published elevation when set to the local altimeter setting. However, for certification and in-service checks, a tolerance of +/- 50 feet is often expected when comparing to an accurate source, but the CAR states 75 feet 'of the reported field elevation'. The typical standard for pre-flight check when adjusted to current local is +/- 75 feet, but an instrument that consistently reads 50 feet off is often borderline.
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Question explanations
- When flying an NDB approach, what instrument is primarily used to track the inbound course?
- How does an aneroid barometer in an altimeter respond to a change in atmospheric pressure?
- What is the primary characteristic that differentiates a Localizer Performance (LP) approach from a Localizer
- When interpreting a TAF (Terminal Aerodrome Forecast), what does 'PROB30' indicate?
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