Flight cannot begin, till wasn't detect all the due resources, that they were completes all following conditions:

1. Adequate machinery, which are needs for flying and for safe running include aircraft communication system and navigation instrument, are available to realisation flight.
2. Aircrew must be apprise of place and using relevant emergency system
and passengers must be knowing about it. For aircrew and passengers must be available
full incident informations about emergency practice and usage safety cabin system.
3. Captain of aircraft must be sure, that:

a)aircraft is able to flying;
b)instruments and machineries, which are needs to realisation this flight, are install in aircraft and they are function;
c)mass & balance must are realize in limits

Too many accidents happen because the aircraft is not loaded within the limits of mass & balance. For some reason, a number of pilots never makes a mass & balance calculation, often because they think it's too complicated or it takes too much time. This attitude not only jeopardizes their life but also the life of their passengers and of people on the ground.

4. Aircrew must have informations about meteorological conditions for flight away airport , target airport, and eventually for alternate airport, and condition on flight path too. Individual care must be give to potential danger atmospherics condition.
5. When is knows or expects icing creation, must be aircraft furnished or adapting , to can fly safely in this conditions.
6. Quantity of fuel and oil aboard must be full to provide, that planned flight can be safely realize, in consideration of meteorological conditions, any element, which influence power aircraft and any delay, which myself look forward to in time flight. Also they must carry about reserve fuel on emergency events too.

KEY ELEMENTS OF PREFLIGHT PLANNING

1. Charts

A basic element of preflight preparation requires the use of current navigational charts on which pilots can mentally review their intended route of flight. They may or may not wish to draw a line on the chart representing the true course. They should, however, review the projected path across the face of the chart for the location of good checkpoints, restricted areas, obstructions, other flight hazards, and suitable airports.

2. Route

Since the shortest distance between two points is a straight line, a majority of pilots disire direct routes for most flights. Quite often there are factors that should be considered that may make a direct flight undesirable. Restricted and prohibited areas present obstacles to direct flights. In single-engine aircraft, pilots should give consideration to circumnavigating large, desolate areas. Pilots should also consider the single-engine service ceiling of multiengine aircraft when operating over high altitude terrain since the terrain elevation may be higher than the single-engine service ceiling of the multiengine aircraft being flown.

3. Weather

A weather briefing is an important part of preflight planning. An overview of the synoptic situation and general weather conditions an be obtained from public media (radio, TV, etc.) or by telephone from recorded sources. This will help the pilot to better understand the overall weather picture. The weather information should be weighed very carefully in considering the go/no-go decision. This decision is the sole responsibility of the pilot and compulsion should never take the place of good judgment.

Making a proper preflight preparation is an important part of flight safety. Before each flight must by an aircraft checks by preflight preparation, to find out, if it is able for planned flying. Cockpit helps pilots make their preflight preparation by offering a convenient preflight preparation software. This consists of a navigation log, a mass & balance and a conversions calculation programme.