Diversions

Question 1

1. When is a take-off alternate required/not required
2. What weather is required at the take-off alternate

Answer 1

1. Not required if departure weather ≥ landing minima
   Required if departure weather < landing minima
2. Weather must be at or above operating minima at the estimated time of use

Question 2

How far may the take-off alternate be for a:
Single engine aircraft
Dual engine aircraft
Three/Four engine aircraft
Extended Diversion Time Operations aircraft

What if the POH does not publish OEI cruise speed

Answer 2

Single-engine:
- 20 minutes flying time

Twin-engine:
- 1 hour at OEI (one engine inoperative) cruise speed (still air, actual take-off mass)

Three- / Four-engine:
- 2 hours at OEI cruise speed

EDTO aircraft:
- Within approved maximum diversion time of the operator

Use maximum continuous power speed on remaining engine(s)

Question 3

1. Do IFR flights normally require a destination alternate
2. When is no destination alternate required
3. When must 2 destination alternates be selected
4. Which approach minima may you use

Answer 3

1. Yes
2. Only if all of the following apply:
   Reasonable certainty of VMC at ETA
   At least one runway has an instrument approach
   Separate runways are available (if one closes, another remains usable)
3. If at destination:
   Weather will be below operating minima, or
   No meteorological information is available
4. The least restrictive approach, provided:
   Facilities are operational
   Aircraft is equipped
   Crew is rated and current

Question 4

Do isolated aerodromes require destination alternates

Answer 4

No. Instead you must:

Determine a Point of No Return (PNR)

Reassess weather before passing PNR

Additional fuel must be carried

Question 5

What time window must weather meet planning minima

Answer 5

hour before to 1 hour after ETA