BR-ANAC-R-IFRA Practice Questions - ANAC R-IFRA Regulations Theoretical Examination - Airplane IFR (Regulamentos, ênfase IFR Avião) Exam

What is the primary operational difference between a Decision Altitude (DA) and a Minimum Descent Altitude (MDA)?

MDA is referenced to height above threshold (HAT), whereas DA is referenced to sea level atmospheric pressure without altimeter setting DA is referenced to MSL on a precision approach (or APV) where descent continues to missed approach point if visuals are not met, whereas MDA is the lowest altitude on a non-precision approach below which descent is not authorized without visual reference MDA is used for ILS Category I approaches, while DA is used for VOR and NDB non-precision approaches DA allows descent 200 feet below published minima during bad weather, whereas MDA strictly forbids any descent

Correct Answer:

DA is referenced to MSL on a precision approach (or APV) where descent continues to missed approach point if visuals are not met, whereas MDA is the lowest altitude on a non-precision approach below which descent is not authorized without visual reference

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