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HeliTorque :: View topic - JetRanger 'Hot starts.'
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HeliTorque Forum Index » Flight Dynamics

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Starting to 'Torque
Starting to 'Torque

Joined: Mar 18, 2006
Posts: 11
Location: Ft. Worth, TX


PostPosted: Sun Apr 16, 2006 6:53 pm    Post subject: Reply with quote

Perhaps you know someone who knows someone, Bell417?

Through research, the 206A Flight manual doesn't say anything about battery cart starts, only external APU's.
"BATtery switch - ON (OFF if auxillary power is used). Observe ENG OUT, ROTOR LOW RPM (if installed) GEN FAIL, and TRANS OIL PRESS lights ON. Applicable RPM audio signals - Check." It then goes on to say..."External power - Remove - BATtery ON."

Now in the 206BII is where the change is present...
"Battery switch - On for battery or GPU start, OFF for Battery Cart start."

I'll add more if I'm able to gather it...
The comments and postings on this site by me are of my own and do not
neccessarily represent Bell Helicopter's position, strategies or
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Shy 'Torquer
Shy 'Torquer

Joined: Dec 25, 2006
Posts: 2


PostPosted: Sun Feb 11, 2007 4:36 pm    Post subject: Two reasons Reply with quote

There are two reasons for hot starts. One, not enough airflow to cool/contain the combustion; Two, too much fuel that even the proper airflow at the N1/NG speeds during start can't cool/contain it.

The first reason is almost always a voltage issue. The second reason is a little bit harder to account for. Sometimes, the drain is clogged and a previous aborted start leaves fuel in the can. Most often, the pilot introduces more fuel than the airflow can contain.

I've had one hot start (never in a B206, but in an OH-58D) as a result of my own brain stall and not making sure that the throttle was closed (it was in the idle detent), but it sounded so wrong that I was able to get it closed and keep it in the range of a visual inspection. The second I have experienced was with another pilot on the controls and a suspected weak battery in a dual-battery start. A weak, No. 1 battery created a drain that the No. 2 battery couldn't overcome. Again, we were able to catch the spike in time to only incur a visual inspection of the engine. Now, I always check both batteries to ensure they are both above the minimum charge to start, otherwise I will only start with the one battery that is adequately charged.

Also, I have personally set a temperature limit (725 deg C) that I will abort the start if I see the reading begin to spike through that temperature, and I brief this to the other pilot. I have yet to experience another hot start since (knock on wood).
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