density altitude


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Related to density altitude: Pressure altitude

density altitude

[′den·səd·ē ′al·tə‚tüd]
(meteorology)
The altitude, in the standard atmosphere, at which a given density occurs.

density altitude

density altitude
Calculation of density altitude when pressure altitude and temperature are known.
An atmospheric density expressed in terms of the altitude, which corresponds with that density in the standard atmosphere. It is the pressure altitude corrected for temperature. Density altitude is used for computing and predicting aircraft and engine performance, including takeoff, climb, and landing performance, instead of true or pressure altitude. On most computers, it can be read directly when calculations for true air speed (TAS) are made.
References in periodicals archive ?
Using round numbers and maximum gross weight, density altitude of7500 feet on the ground means an initial climb rate of about 500 FPM.
Unless you're simulating high density altitude conditions, always use full takeoff power.
Pressure Altitude/Density Altitude (PADA)--computes the following parameters: sea level pressure (SLP), altimeter setting (ALSTG), pressure altitude (PA), density altitude (DA) and the standard atmosphere based on the upper/lower station pressure and the following optional data fields: station elevation (for ALSTG, PA, DA), 12-hour mean temperature (for SLP), temperature (for DA) and dew point for DA.
Nearly one quarter of aerial-application crashes were related to density altitude (4).
The combined effects of being slow, with a tailwind, in an environment of high density altitude, and in a high gross weight configuration, placed the CH-53D in a hover-out-of-ground-effect situation without sufficient power.
The elements to be controlled and understood must include the changes in the daily density altitude along with the different barometric pressure levels that occur in different geographic locations.
If you've never used a whiz wheel, it has two main parts: a circular slide rule side for making quick airspeed and density altitude calculations (to name two), plus a wind side for computing groundspeed and wind correction angle.
I understand I'm a spoiled flatlander, but operations in high density altitude conditions to and from locations I normally would reject for an emergency landing seem to leave little margin for error, at least the kind of margin with which I'm accustomed.
While that's not impossible, add a little density altitude to the airport elevation--it is West Texas, after all--and you could get a close look at just why the climb rate is required.
The rescue team which comprised Wg Cdr DC Tiwari, Flt Lt A Agrawal and Flt Lt A K Bharmoria, led by Wg Cdr S Srinivasan knew well the challenges they were about to face but upholding the unit tradition they decided to take on the mission and operated their machines to the fringes of their limits as the mission involved flying into unknown territory and landing at a density altitude of approximately 23000 ft over an inhospitable glacier.
Recognizing the risks of a single-engine, heavyweight landing on a wet runway at high density altitude with weather near ILS minimums, Capt Lanto made the decision to emergency jettison his munitions on a controlled range.