ANN's Daily Aero-Tips (11.11.06): Hot Start | Aero-News Network
Aero-News Network
RSS icon RSS feed
podcast icon MP3 podcast
Subscribe Aero-News e-mail Newsletter Subscribe

** Airborne 04.18.14--CLICK HERE! ** HD iPad-Friendly Version--Airborne 04.18.14 **
** Airborne 04.16.14--CLICK HERE! ** HD iPad-Friendly Version--Airborne 04.16.14 **
** Airborne 04.14.14--CLICK HERE! ** HD iPad-Friendly Version--Airborne 04.14.14 **

Sat, Nov 11, 2006

ANN's Daily Aero-Tips (11.11.06): Hot Start

Aero-Tips!

A good pilot is always learning -- how many times have you heard this old standard throughout your flying career? There is no truer statement in all of flying (well, with the possible exception of "there are no old, bold pilots.")

Aero-News has called upon the expertise of Thomas P. Turner, master CFI and all-around-good-guy, to bring our readers -- and us -- daily tips to improve our skills as aviators. Some of them, you may have heard before... but for each of us, there will also be something we might never have considered before, or something that didn't "stick" the way it should have the first time we memorized it for the practical test.

Look for our daily Aero-Tips segments, coming each day to you through the Aero-News Network.

Aero-Tips 11.11.06

More and more airplanes in the general aviation fleet have fuel injected engines. One of the lessons pilots need to learn about starting fuel injected engines is how to start them when they are hot -- how to prevail in the dreaded "hot start".

Note: a "hot start" in turbine engines is a completely different situation, with a far more critical outcome. Today's we'll stick to our fuel-injected piston topic.

Why hot starts are an issue

Fuel injected engines depend on liquid fuel in the lines all the way to fuel injector nozzles, which combine air and fuel just before it enters the cylinders for combustion. Any vapor in the fuel lines interrupts flow, and may form a "vapor lock" that prevents fuel delivery altogether. Fuel vapor results from undissipated heat, usually in an engine-driven fuel pump but sometimes elsewhere in the fuel injection system.

Hot start

The procedure to perform a hot start differs based on the engine/airframe combination and, significantly, the type of fuel injection system involved, but all hot start procedures have one thing in common: replacing fuel vapor with liquid fuel. This can be accomplished in several ways:

  • Running a boost pump while the mixture control is in the idle cutoff position.
  • Attempting start with the mixture in idle cutoff, and advancing the mixture when the engine fires (note; this is the normal start procedure in some fuel-injected engines).
  • Purposely flooding the engine (by running the a boost pump with the mixture set to rich), then performing the Flooded Start procedure.
  • Performing the normal start with the throttle set more open than normal, hoping the engine-driven fuel pump pushes vapor out of the lines.

Put 20 pilots in a room and you'll probably come up with about 18 different ways to hot-start a fuel injected engine. Any may work on any given day, but generally there's one technique that works best for a specific engine/airframe combination. Some options (like intentionally flooding) may result in a damaging backfire or, in extreme cases, an engine-warping liquid lock in the cylinders.

Aero-tip of the day: Ask engine experts (user groups, manufacturers, etc.) to learn a safe, dependable way to hot start the fuel injected engines you fly.

FMI: Aero-Tips

Advertisement

More News

Airborne 04.18.14: SpaceX's Historic Pad, Sikorsky Going Presidential?, EAA B17

Also: Airmen Support Pilot's Son, Beyond The Blue!, More Wrong-Way SWA Fallout, Missing WWII Airman Comes Home NASA signed an agreement with Space Exploration Technologies Corporat>[...]

Aero-News: Quote Of The Day (04.21.14)

"Based on its Platinum Forecast System 2.0, Forecast International expects production of about 1,000 UAVs of all types in 2014, with output rising to nearly 1,100 units in each of >[...]

Aero-News: Quote Of The Day (04.20.14)

"The discovery of Kepler-186f is a significant step toward finding worlds like our planet Earth. Future NASA missions, like the Transiting Exoplanet Survey Satellite and the James >[...]

Skydive Jersey Announces Shuttle Service For 2014 Season

Removes 'Getting To The Airport' As An Excuse To Not Go Skydiving So imagine it's a beautiful day to go jump out of an airplane in the greater New York City area, but you just don'>[...]

Klyde Morris 04.21.2014

It's A Dog-Eat-Ant ... Errr ... Dog World, Klyde FMI: www.klydemorris.com>[...]

blog comments powered by Disqus



Advertisement

Advertisement

Podcasts

Advertisement

© 2007 - 2014 Web Development & Design by Pauli Systems, LC