Instrument approaches legally require a certified and authorized altimeter setting; if one is unavailable (even from approved alternate sources), the approach is unusable per regulations (AIM ...
Mechanical altimeters, despite their ingenious design, are susceptible to various instrument errors including mechanical wear, scale inaccuracies, installation/position effects, and hysteresis, which ...
French investigators are highlighting the importance of validating altimeter pressure settings, after a Hop Bombardier CRJ1000 descended below the glidepath on approach to Nantes. The aircraft (F-HMLD ...
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