General Aviation Pilot’s Guide to Preflight Weather Planning, Weather Self-Briefings, and Weather Decision Making(23)

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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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