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

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Bell417
Starting to 'Torque
Starting to 'Torque


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


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

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...
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Linc
Shy 'Torquer
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Joined: Dec 25, 2006
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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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