nuckolls.bob(at)aeroelect
Guest
|
 Posted: Sat Jan 25, 2014 2:57 pm Post subject: Fuse holders |
 |
|
At 02:32 PM 1/25/2014, you wrote:
| Quote: | Hi Bob. I found out about you through an EAA article I read. I have a question to ask if I may. I have a 69 Cherokee that I'm installing a timer, and some lighting in. I wanted to put in 2 1A c/bs, but I couldn't find any dimensionally to fit (I guess they don't make my size c/b anymore) so I thought maybe I could put in fuse holders. My airplane didn't come with fuse holders to get a part #, so I looked through 43-13, and the mechanic's handbook, but can find no mention of when you can, or can't use a fuse holder, or what the specs. need to be. Can I legally install a panel-mount, or in-line (aircraft wiring?) fuse holder such as from Spruce in a certified airplane? Thank You for your time.
|
First, this is between you and your IA. It's a
'modification' but can probably be considered
minor . . . perhaps needing nothing more than
a log-book entry and update to the weight and
balance. On the other hand, an IA that knows
a great deal about the need for balanced flight
control surfaces MIGHT elevate the task to
something akin to an STC for JATO assist
take-off bottles.
Do some IA shopping FIRST.
There is no reason in physics, legacy practices
nor past examples of type certificated aircraft
stating that you cannot use fuse-holders. The FARs
require only that feeders from the bus be protected from
conflagration due to faults . . . they speak to
'circuit protective' devices which has included
fuses, circuit breakers and (for the currents
you're talking about) PTC self resetting fuses.
First, are you sure you NEED to add any circuit
protection? It's entirely 'kosher' to run multiple
appliances from a single fuse/breaker as long as
loss of all appliances on the circuit does not
offer more than a maintenance event.
These things sound like they're rather innocuous
with respect to aircraft operation . . . can
you power them from an existing breaker powering
an equally innocuous appliance?
If you decide to add fuses, make them panel
mounted and accessible to crew is probably
unnecessary too. Consider in-line fuse holders
tied into wire bundles close to where they tap
the bus structure.
This style of fuse holder was used on many
of your airplane's ancestors . . .
[img]http://contentinfo.autozone.com/znetcs/product-info/en/US/val/31472/image/3/[/img]
An if you have both space and desire to panel
mount some fuse holders, these are one option
of several . . .
You can acquire the holder above or the one below
from a local car-parts store. The one below uses
the plastic ATC style fuse and would tie into the
wire bundles behind the panel.
[img]cid:.0[/img]
You probably wont find an ATC1 fuse in the
car parts store but an ATC3 or 5 is fine.
Bottom line is that there are no practical
restrictions in physics for adding these
devices to your airplane . . . it's more a
matter to be decided between you and whoever
is going to sign off your paperwork.
Bob . . .
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
| Description: |
|
| Filesize: |
43.17 KB |
| Viewed: |
701 Time(s) |
|
|
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
