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--Do current or forecast ceiling and visibility conditions require me to select and file an alternate? (1-2-3 rule.)
--Where is the nearest GOOD weather alternative?
. How do reported and forecast conditions for ceiling and visibility compare with my personal minimums for IFR?
Aircraft Performance
.
Given temperature, altitude, density altitude, and aircraft loading, what is the expected aircraft performance?
o Takeoff distance
o Time & distance to climb
o Cruise performance
o Landing distance
.
Are these performance values sufficient for the runways to be used and the terrain to be crossed on this flight?
(Remember that it is always good practice to add a 50% to 100% safety margin to the “book numbers” you derive from the charts in the aircraft’s approved flight manual (AFM)).
. Will weight restrictions allow me to carry more than the normal fuel reserve?
(More fuel means that you have more options to escape weather.)
. Icing. What is the forecast freezing level for this flight?
o Are there any pilot reports (PIREPS) for my route, or points on the route that support or rebut the icing forecast?
o Where are the cloud bases and cloud tops?
Turbulence
.
Are the wind conditions at the departure and destination airports within the gust and crosswind capabilities of both the pilot and aircraft?
.
What is the maneuvering speed (VA) for this aircraft at the expected weight?
(Remember that VA is lower if you are flying at less than maximum gross weight.)
. Thunderstorms. Does the forecast include convective activity at any point along my proposed route?
34 12/09
IFR Analy
s
is
W
o
rksheet
Turbulence Ceiling & Visibility Visibility & Performance Trends
Place Time Wind Visibility Weather Ceiling Temp/Dewpt Altimeter
Turbulence Analysis Ceiling and Visibility Analysis Performance Analysis
Nearest
VFR
Weather
Direction:
N S E W
Distance:
____ nm
Flying time to nearest good VFR:_______
Personal Minimums: Personal IFR Approach Minimums:
Wind speed = ______ Ceiling = __________
Gust factor = _______ Visibility = _________
Crosswind = _______
Planned altitude = _____________ ___________ -Lowest en route ceiling = ______
Departure wind = ______@_______ ground clearance
Destination wind = _____@_______ Planned altitude = _____________
En route wind = _______@_______ -Highest en route obstacle =_____
Maneuvering speed = ___________* clearance Planned altitude = _____________
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本文链接地址：General Aviation Pilot’s Guide to Preflight Weather Planning, Weather Self-Briefings, and Weather Decision Making(23)
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