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MauleDriver(at)nc.rr.com
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 Posted: Thu Jul 15, 2010 11:50 am Post subject: Panel Accessible breaker for Mission Critical Item |
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I have chosen to mainly use fuses on my (non-flying) RV10 with a Z-14.
I do have 4 breakers in no particular order:
#1 & #2 for 2 LRC3 regulators
#3 for the autopilot which I consider a quick dis-connect switch
#4 for the flaps
I don't think a no-flap landing in '10 is a big deal but I came up with
the same scenarios (high speed deployment, ice) which 'could' blow the
circuit protection and justify a reset.
My fuses are on two panels in the right seat leg well wall.
I've been flying my Maule for over 10 years and 1300+ hours and never
had a breaker pop. My thinking goes something like, "it probably won't
happen in my lifetime, if it does on a CAVU day, land it and don't risk
a fire, if does happen on a dark and stormy, use the backups to land it
since you have like 3 layers of them"
But I'm not flying it yet
Bill "Polyurethaning" Watson
Durham, NC
ray wrote:
[quote]
FWIW
Could attempting to deploy flaps at too high a speed result in an
overload resulting in a blown CB?
Could attempting to deploy flaps with an ice buildup result in an
overload resulting in a blown CB?
Could there be any other conditions (bird's nest, or ????) that might
be cleared during flight or by multiple attempts to deploy flaps?
I'm in favor of a resettable CB.
Raymond Julian
Kettle River, MN.
On 07/15/2010 01:23 PM, longg(at)pjm.com wrote:
>
>
> Thanks,
>
> Ok, so we're all in agreement that either resetting a breaker or
> replacing a fuse on flaps in flight is completely futile? And were quite
> sure no one in history has recovered from a popped breaker on a flap
> motor?
>
> That makes my decision easy.
>
> Glenn E. Long
> --
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franz(at)lastfrontierheli
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| Posted: Thu Jul 15, 2010 12:05 pm Post subject: Panel Accessible breaker for Mission Critical Item |
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Hi All,
The one thing to consider is the fact that there is no harm done in landing
with the flaps retracted. Therefore I see very little value in having the
ability to reset the breaker or change the fuse if the flaps don't extend.
Now of course we can look at the scenario where the flaps are extended
already and the breaker or fuse blew during a full extension or when trying
to retract. This would most likely be in a case during a go around in which
case all hands are busy to fly the airplane anyway and the PIC should not
distract himself with other things .
Franz
RV7A-450h
On 15/07/10 12:30 PM, "longg(at)pjm.com" <longg(at)pjm.com> wrote:
[quote]
Thanks All,
Yes, I tend to agree - there must be some value (and a lot of memorable
stories) in being able to reset flaps at least once. Sure, if a problem
exists, or I see smoke - forget it, but for all the reasons mentioned
it's worth $20.
Glenn E. Long
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jay(at)horriblehyde.com
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| Posted: Thu Jul 15, 2010 1:15 pm Post subject: Panel Accessible breaker for Mission Critical Item |
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I am also building a Legacy and I feel that there may be a possibility that
the motor could be overloaded - more particularly with the landing gear
which is hydraulic. Here the motor drives a hydraulic pack and I think that
one may get an overload which could be due to a bit of dirt in the fluid or
something like that. One reset may (?) allow this to be cleared and you can
try again. Of course you also have the option, when needing to lower the
gear, of a dump valve that allows the gear to swing free and down.
It seems to me that flap loss in a Legacy can be a big deal so one reset
should be allowed. The guy I am building for is an airline pilot and he
wants to see breakers. After much persuasion I managed to convert him to
the fuse options but threw in a bone with it; flaps and gear could have
breakers.
My philosophy is that if it is possible to overload the circuit, such as
with a motor, then a CB is permissible. If it is a non-varying load, such
as a light, no reset.
Jay
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N20DG
Joined: 02 Jan 2008
Posts: 61
Location: lancaster, texas
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| Posted: Thu Jul 15, 2010 2:13 pm Post subject: Panel Accessible breaker for Mission Critical Item |
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It happens in flight
Can't reset the breaker or replace the fuse
you know this application has but one remedy
install a mechanical AOA and learn how to use it
Always be proficient in no flap landings to a point where it will not be a big deal to do it. Practice it four or five times a month to maintain the proficiency
Now chew my a__ for saying this
Dick
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longg(at)pjm.com
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| Posted: Mon Jul 19, 2010 1:10 pm Post subject: Panel Accessible breaker for Mission Critical Item |
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AOA's are great and I agree with the need. They should be careful
calibrated and even then while helpful, don't bet the bank on them.
Per my original email if you fly a Lancair there is no such thing as a
proficient no flaps landing. It's simply risky. Certainly it can be done
in an emergency. Take whatever precaution you need to ensure the flaps
are working or as I indicated earlier, find a long runway.
Glenn E. Long
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