Combined with an air temperature of, creating a condition known as " hot and high " ( high density altitude ), the C-414 could do little but struggle into the air within ground effect, and once airborne was left virtually uncontrollable.
32.
Also, a new Automated Weather Observation System ( AWOS ) was installed in 2007 and records weather data such as wind speed, wind gusts, wind direction, variable wind direction, temperature, dew point, altimeter setting, density altitude, visibility, variable visibility, precipitation, sky condition, and cloud height .
33.
Although employed extensively throughout the war as a ground attack platform, the Hind suffered from a weak tail boom and was found to be underpowered for some missions it was called upon to perform in the mountains of Afghanistan, where high density altitude is especially problematic for rotary-wing aircraft.
34.
Situated at an altitude of above sea level, the density altitude is as high as when the outside air temperature ( OAT ) is 30 �C . Special consideration must be given to flight planning in the summer when the ambient temperature is that high; there have been many accidents at this airfield as a result of reduced aircraft performance under these extreme conditions.
35.
The one engine inoperative ( OEI ) service ceiling of a twin-engine, fixed-wing aircraft is the density altitude at which flying in a clean configuration, at the best rate of climb airspeed for that altitude with one engine producing maximum continuous power and the other engine shut down and feathered, will produce a given rate of climb ( usually 50 feet per minute ).
36.
For A-7A aircraft, high density altitude and maximum weight runway takeoffs often necessitated a " low transition ", where the aircraft was intentionally held in " ground effect " a few feet off the runway during gear retraction, and as much as a departure at treetop altitude before reaching a safe flap retraction speed . ( A-7A wing flap systems were either fully extended or fully retracted.
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