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THIS IS AN UNCONTROLLED DOCUMENT.
THIS ELECTRONIC DOCUMENT MAY HAVE BEEN SUPERCEDED.
THE MOST CURRENT DOCUMENT INFORMATION IS AVAILABLE
FROM YOUR BELL HELICOPTER TEXTRON REPRESENTATIVE.
PRODUCT DATA JANUARY 2003
COMBUSTION SECTION
Each engine has its' own separate ignition system exciter, shielded igniter plug cables
and
igniter plug. The engines are easy to start and require no warm-up. The battery is
capable of starting engines in cold weather to -32°C (-25° F). Starting capability with
external power extends to temperatures as low as -45°C (-49°F).
The combustion section consists of an outer case, a combustion liner, an igniter and a
fuel injector. The prechamber combustion system is designed to burn fuel at peak efficiency
and to minimize emissions. Fuel is sprayed into the chamber at a precisely controlled
rate. The single igniter produces a constant spark while the start circuit is energized,
until automatic starter disengage at 58% N
G
. Gas flow moves forward out of the chamber
to the first stage GP nozzle.
IGNITION & STARTING
FUEL REQUIREMENTS
Combustion is continuous as long as the proper fuel / air mixture is maintained. The
prechamber combustor provides reliable high altitude / cold starting; with Jet A (JP-5)
at 0°C (32°F) and Jet B (JP-4) at -45°C (-49°F). For operations when temperatures are
below -12°C (10°F), an anti-icing fuel additive is required.
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