Alternates and planning minima
8 min read
Kinds of alternate
Take-off alternate: needed when the weather at the departure aerodrome would not allow a return. For a twin it must be within one hour at one-engine-out cruise speed in still air (two hours for three or more engines; for an EDTO-approved twin, its approved diversion time but not more than two hours), in still air and standard conditions.
Destination alternate: where to go if you cannot land at the destination. Normally at least one is required for IFR; two in some cases (for example when the destination forecast is below the applicable planning minima, or no meteorological information is available).
En-route alternates: for long flights, especially EDTO.
IN THIS LESSON
- Planning minima
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