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Flight Planning

VFR Flight Planning, Weather

Preflight planning is a very important element of any flight and especially so when going on a cross country flight. There are a number of items to be done in preparation for a VFR cross country in such a way that nothing is overlooked and the intended flight is done as safely as possible.

The most important parts of preflight planning involve checking flight information publications, aviation weather reports and determining airplane performance, including the computation of weight and balance and fuel requirements.

The influence of altitude, temperature and wind should not be ignored and you should be familiar with the pressure and density altitudes and the effect that they have on aircraft performance. Verifying available runway lengths and comparing them to your takeoff requirements and the rotational and initial climb speeds recommended in your airplane's manual (POH).

This part is the weather pre-flight and is usually completed on the day the flight will actually take place.



Weather Briefing

In todays world we as pilot have a huge amount of weather services available. It is best to start with the big picture and work your way down. Make note of where the fronts are with interest in low pressure systems as these carry most adverse weather.

The weather pre-flight items that have to be completed on the day of the flight are listed below.

Airport Runway

Weather

Obtain a thorough weather briefing, see our weather section for more information and study getting a weather briefing before the flight document.

When requesting weather information from a certified weather office, 1-800-WX-BRIEF.com, be prepared to have the following information before hand:

  • Type of aircraft and flight, VFR or IFR
  • Departure airport and time and or date, mention if local or on UTC time
  • Intended route, Altitude and Speed
  • Destination airport and if applicable: time of return
  • Any other pertinent info about your flight (previous received WX info, endurance, etc etc)

It sure makes a difference to know if you intend to fly with a C-150 or a King Air C-90, or even heavier iron, in terms of any reported or forecasted turbulence and its effect on your flight.

Wind Chill TableWind Chill Table

Be sure to get at least the following meteorological reports (observations, analysis and forecasts):

  • Current and Forecast conditions, destination and departure airport, TAF / METAR
  • Winds aloft forecast, especially in mountainous areas
  • Surface analysis and radar/ satellite images
  • Any pilot reports and NOTAMs
  • Any other important weather data: AIRMET, SIGMET etc
  • 500 mb (18000 ft) chart to see in which direction a front(s) is moving

Note that: METARS, TAFs and AIRMETs use above ground level (AGL) altitudes for cloud bases. Others such as clouds are referenced to mean sea level (MSL). Make sure that you are familiar with the various SIGMET and AIRMET types available and the conditions under which they are issued.

Use this information to visualize an image in your head of the weather along your route and, most importantly, keep obtaining updated reports from ATIS, FIS/FSS or even from Tower.

More tips and tricks for using 1-800-WX-BRIEF and Aviationweather.gov can be found at Self-Brief The Weather article from AVweb.

Winter flying

During winter, flying takes on a new meaning. Getting lost due to white out in mountain areas is easy and an emergency landing could end up badly. Even when refueling the wind chill factor is going to be a serious issue, read flying in winter conditions for more info. Check the table to the right for greater detail on wind chill.

The following document contains tips for applying weather information during the trip.

Mountain flying

Guaranteed awesome sceneries for you and your passengers but not without danger. Even relatively light winds can create turbulence too much to handle for the aircraft possibly resulting in a disaster. Our section has more tips on this. Be sure to read it.

written by EAI.





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