Figure 7-3 Weather

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CHAPTER SEVEN
INSTRUMENTS FLIGHT PLANNING
8.  To clarify the use of PAR minimums when determining destination and alternate weather
requirements, remember:
a.
Look at the weather forecast for your destination.
b.
Look at the minimums for the runway in use including PAR minimums.
c.
Compare the two and enter the chart in Figure 7-3 with destination weather.
Remember that PAR minimums are taken into account for the destination weather side of the
chart, but not for the alternate weather side of the chart. Also note that if the PAR is NOTAM'd
down for the runway in use then you will not be not able to use PAR minimums to determine
your alternate weather. You would then use LOC/VOR/TAC/ASR or circling minima.
Example: In Figure 7-2 our destination is NAS Pensacola and we are planning an approach to
RWY 7R. Our forecast weather is 200 ­ ¼. Our possible minima for this RWY are S-7R
(400 ­ ¾), circling (500 ­ 1½) and S-PAR 7R (100 ­ ¼). Adjusted for single-piloted minima,
the PAR weather mins become (200 ­ ½). Our lowest possible minima after ensuring that the
PAR is not NOTAM'd down at NAS Pensacola are for the S-PAR 7R of (200 ­ ½). We enter
the destination weather side of the Figure 7-3 chart. Look at the first row: 0 ­ 0 up to, but not
including published minimums. Our destination weather of 200 ­ ¼ falls into this first category,
thus requiring alternate weather of 3000 ­ 3 or better.
DESTINATION WEATHER
ALTERNATE WEATHER
ETA plus and minus one (1) hour
ETA plus and minus one (1) hour
0 ­ 0 up to but not including
3000 ­ 3 or better
published minimums
Published minimums up to but not including
NON-
3000 ­ 3 (single-piloted absolute minimums
PRECISION
PRECISION
200 ­ ½)
ILS
PAR
*Published
Published
*Published
minimums
minimums
minimums
plus 300 ­ 1
plus
plus
200 ­ ½
200 ­ ½
3000 ­ 3 or better
No alternate required
*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.
Figure 7-3 Weather
VT-10/4 aircraft are always considered single-piloted and PAR/ASR minima may not be
used to choose an alternate. The PRECISION section is reserved for aircraft equipped with
ILS or for aircraft intending to use PAR if they are dual-piloted and have at least two radios.
7-10
IN-FLIGHT WEATHER ANALYSIS

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