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

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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
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
Published
minimums
minimums
minimums
plus 300-1
plus
plus
200-1/2
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
(2-02) Original
Page 8-7

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