Figure 2. Destination/Alternate Weather Examples -- Situation 1

T-45C TS INav-08

Fuel, Weather, and Alternate Airfield Planning

SITUATION 1- DESTINATION FORECASTING BELOW PUBLISHED MINIMUMS:

Assume NAS Jacksonville is forecasting weather of a 100-ft ceiling and 1/2-sm visibility during the period one hour before until one

hour after your planned ETA, with surface winds 090 degrees at 5 kts. You can see from Example A that the published minimums

for a PAR runway 9 approach are 100-1/4.

When evaluating your destination weather, you can use the lowest minimums for any approach you are equipped to make;

therefore, if available, you should look first at ILS or PAR minimums.

Example A

After evaluating the IFR filing criteria (Example B) and approach plate (Example A), fill in the following information:

Forecast weather for NAS Jacksonville is __________.

Your absolute single-piloted minimums are __________.

Your suitable alternate airfield must have forecast weather of __________ ceiling and ___________ miles visibility.

IFR Filing Criteria

ALTERNATE WEATHER

DESTINATION WEATHER

ETA plus and minus one (1) hour

0-0 up to but not including

3,000-3 or better

published minimums

Published minimums up to but

not including 3000-3 (single-piloted

NON-

PRECISION

absolute minimums 200-1/2)

PRECISION

PAR

ILS

* Published

Published

minimums

plus 300-1

plus

200-1/2

No alternate required

3,000-3 or better

*In the case of single-piloted or other aircraft with only one operable UHF/VHF transceiver,

radar approach minimums may not be used as the basis for selection of an alternate airfield.

Example B

As you have noted, NAS Jacksonville is forecasting weather of 100-1/2, which is above published minimums for a precision

approach (100-1/4) at this airfield, however, below the single-piloted minimums of 200-1/2. For this situation, you must select a

suitable alternate having forecast weather of 3,000-3 or better during the period of one hour before to one hour after your ETA at

alternate.

Figure 2: DESTINATION/ALTERNATE WEATHER EXAMPLES -- SITUATION 1

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