• Skip to main content
  • Skip to primary sidebar
  • Home
  • Contact

Golf Hotel Whiskey

Golf Hotel Whiskey: for pilots and aviation enthusiasts

All about density altitude

The July/August issue of FAA Safety Briefing featured an interesting article (“Climbing into Thin Air”) discussing density altitude – an invisible danger for high-altitude mountain flyers on hot summer days. The FAA article began by providing this description of density altitude:

There is a thief among us! Without warning, it can sneak into your airplane and rob you of precious lift, thrust, and power. And, if you’re not careful, it can quickly put you in a deadly spot during your next flight.

The culprit here is not something particularly obvious, nor is it something pilots who routinely fly at or near sea level are used to dealing with.

The article then related the story of a fatal accident that recently occurred in Arizona where a pilot failed to attain and maintain an adequate airspeed during takeoff in high density-altitude conditions. This resulted in an aerodynamic stall.

The article continued by noting that when density altitude is high as a result of temperatures that are above standard at a given altitude, the air is less dense than normal. Hence, an aircraft will perform as if it were flying at a higher altitude with decreased climb performance and acceleration ability. This can be a big problem if you are flying on a hot and humid summer day and if you are operating from a short runway that has a few tall pine trees at the end of it.

However, a hot day can have an affect on aircraft performance at any altitude. Hence, the article quoted one flying expert who suggested that pilots need to become familiar with the weight-and-balance along with the performance and limitations sections of a pilot’s operating handbook (POH) or airplane flight manual. In addition, avoiding takeoffs and landings at midday when temperatures are usually at their highest and instead taking advantage of cooler mornings or evenings will also help to avoid performance surprises.

In other words and if you plan on doing any summer flying, be aware that humidity and temperatures can impact your aircraft’s performance and be sure to plan accordingly.

Reader Interactions

Comments

  1. Blake Crosby says

    July 29, 2010 at 15:05

    Density altitude is very important when you need to calculate your performance numbers. It's amazing how much a few degrees can make a different to your take-off roll.

    NavCanada in Canada is in the process up updating all of their AWOS to include the density altitude in the METARs. For example:

    METAR CYTZ 291400Z AUTO 01006KT 320V040 9SM CLR 22/13 A3001 RMK SLP161 DENSITY ALT 1000FT RVR MISG

    You can see the density altitude in the "Remarks section".

    Reply
  2. Melvyn R. Tichy says

    February 28, 2011 at 05:15

    It's a weight problem. Here, near Big Bear California. Folks fly in, but don't fly out. The hotest part of the day here is around 14:00.

    With only 70% power, and allready a mile high, you do not need a full tank of fuel to take off and get home. They say that the only time you can have too much fuel is if your on fire. (Not true) You can also have too much fuel to make a short field high altitude takeoff.

    Click off at a maximum of 70% Full… to fly again; another day.

    Reply

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Primary Sidebar

Matthew Stibbe
Matthew Stibbe is CEO of Articulate Marketing and Turbine, the easy, online way to deal with office paperwork. He has an FAA CPL/IR and an EASA PPL/IR and sometimes flies a Cirrus SR-22. He also writes about wine at Vincarta and being a better manager at Geek Boss.
Bureaucracy must die eBook
Subscribe via RSS

Recent Posts

  • IATA Airport Abbreviations
  • Upcoming Concorde and Apollo documentaries
  • Lie Back And Think Of England: London To Austin On BA’s New 787 Dreamliner
  • Video: Parachuting from the edge of space
  • Hilarious preflight safety video for GA aircraft
  • San Francisco Airport at night – beautiful time lapse video
  • A practical jetpack (finally) takes off
  • A man in a hot air balloon realises he is lost
  • Pegasus House: The former HQ of the Bristol Aeroplane Company is restored
  • Vintage British aviation posters from the 1920-1930s

Copyright © 2023 Golf Hotel Whiskey. All rights reserved.