RESUMO DIRETO
O que é Top of Descent (TOD)?
Top of Descent (TOD) is the computed geographic point along a flight route where an aircraft must begin descending from cruise altitude to reach the target fix on a 3-degree descent profile.
Significado: Calculated Descent Initiation PointExplicação Técnica Completa
Calculated using the standard 3:1 aviation rule (Altitude to lose in thousands of feet × 3 = nautical miles before target fix).
FÓRMULA / REGRA PRÁTICA
Descent Distance (NM) = (Cruise Altitude - Target Altitude) / 1000 × 3 + Deceleration Buffer