Limit to battery starts on a C208B?
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Join Date: Apr 2006
Location: Turks & Caicos Islands
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Limit to battery starts on a C208B?
We are having some internal discussions in our unit that I would like an external opinion on.. Namely is there any truth in the theory that the more battery starts the Caravan does in a day 'degrades' the battery anhd could lead to a Hot Start?
Or is it as simple as, watch you temps on the initial start and as long as your alternator is working fine you should be OK for another 'fresh' start after a 30min flights and a 30min cool down?
Appreciate the feedback
Or is it as simple as, watch you temps on the initial start and as long as your alternator is working fine you should be OK for another 'fresh' start after a 30min flights and a 30min cool down?
Appreciate the feedback
Join Date: Feb 2006
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Hi SpeedyG,
Take a look at the battery university:
What causes car batteries to fail?
Testing deep cycle lead acid batterie
Do and don't battery table
In short - yes, there is truth in the theory.
I bet you wish you didn't ask now!
Take a look at the battery university:
What causes car batteries to fail?
Testing deep cycle lead acid batterie
Do and don't battery table
In short - yes, there is truth in the theory.
I bet you wish you didn't ask now!
Join Date: Aug 2003
Location: Sale, Australia
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Proper battery maintenance by some one who knows what he is doing and you will never have troubles, or extremely rarely. One cue we used on one particular type was when you initially hit the start button if the voltage didn't drop below 14 (28 volt system) you would have no trouble. Anything less, watch out. On one operation we were doing, flights only lasted 15 minutes (not good use for the cycle count and not a Caravan) and the last start of the day was always as good as the first. Again we had exceptional maintenance.
Join Date: Aug 2005
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Your 30 minutes flight time plus taxi time should be enough to recharge what you have used during the start. So, I personally dont see any problem with that. The Caravan was built with battery starts in mind.
Like Brian said, when you flick the start switch, have a look at what voltage you see indicated. A good battery will give you around 18 Volts initially (PT6 small series and 40Ah lead acid battery in warm climate), gradually increasing as Ng builds up.
If you get at least 16% Ng before introducing fuel, the electrical side is fine.
In the operation I am in at the moment, we only do battery starts and the company gives us a new battery every 18 months. They found it is cheaper than mess with ageing batteries.
Like Brian said, when you flick the start switch, have a look at what voltage you see indicated. A good battery will give you around 18 Volts initially (PT6 small series and 40Ah lead acid battery in warm climate), gradually increasing as Ng builds up.
If you get at least 16% Ng before introducing fuel, the electrical side is fine.
In the operation I am in at the moment, we only do battery starts and the company gives us a new battery every 18 months. They found it is cheaper than mess with ageing batteries.
Join Date: Jun 2008
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Hello SpeedyG
My company operates more than a handful of Bell 212 helicopters which also run on PT6 engines (-3B twinpack)
And work up between 5 and 15 starts a day on batteries, and this in temperatures ranging from 20+ in the summer to -35 in the winter (itīs in the arctic) And they never give us any grief. We run on Ni.Cad "Marathon" batteries. Itīs only good that they work and are exercised. And if you have a good Batt.overhaul facility which check the individual cells on overhauls you should be fine.
Regards
My company operates more than a handful of Bell 212 helicopters which also run on PT6 engines (-3B twinpack)
And work up between 5 and 15 starts a day on batteries, and this in temperatures ranging from 20+ in the summer to -35 in the winter (itīs in the arctic) And they never give us any grief. We run on Ni.Cad "Marathon" batteries. Itīs only good that they work and are exercised. And if you have a good Batt.overhaul facility which check the individual cells on overhauls you should be fine.
Regards
Last edited by Heliarctic; 7th Nov 2009 at 17:58. Reason: Add on
