Cessna 120-140 Association

1307 wrote: ↑Mon Jun 11, 2018 2:48 am I installed an Odyssey battery, model PC 625, in a Citabria 7GCBC, during the annual, in 2013. Installed the same model PC 625 in a Cessna 120 in 2014. Made a mounting assembly in the original battery location in the 7GCBC. The Cessna 120 battery box was a good fit with two wood blocks for positioning. Completed 337s for each installation, forwarded them to OK City, and they are on file there. No problems. The 2013 battery was replaced this annual in May. Still held a charge, but the owner wanted it changed. Over the years I've seen lawn tractor batteries, motorcycle batteries, car batteries, etc., installed in different planes. I've never had a Gill 12v battery last more than 3 tears. A Concorde RG-25 is in my Cessna 140. Been in there for 6 years.

Is there any way you can send me a copy of your 337 for the Odyssey install in the 120 or is there a way for me to find it? Good data points for my IA.

Thanks!

Here's a copy of my 337 (page 2) for the odyessy install..

I use a Concord RG35, original generator. I use a Battery Minder any time i'm not in the air. I'm in Southern Arizona where the extreme heat eats batteries. I got 9 years from my last battery. I installed with a logbook entry.

from AC 23-27

2. BATTERIES. Ifone type ofseries 35 battery ( e.g. a Gill 35) is approved as original equipment or a PMA part, and another type ofseries 35 banery ( e.g. a Concord 35) is PMA approved for some aircraft models but not your model aircraft, you may install the alternate type of series 35 battery and document the installation with only a logbook entry. This applies to all series 35 batteries. This philosophy also applies to other series, such as series 25 batteries. However, this part substitution is permissible only as long as the batteries are the same weight, within plus or minus one pound, and have such similar physical characteristics as to enable the use ofthe same securing or attaching devices, mechanisms, or containers.
Approval: This is a minor alteration and you may document it by a logbook entry. The logbook entry must reference the original and replacement manufacturer's identification or the performance specifications of the original and replacement battery.

I would be concerned with the installation documented in the above 337. Attaching the bracket to the aft wall of the battery box changes the forces at play in a frontal crash. Instead of being supported by the forward wall of the battery box, and the aft battery box attachments in shear, the force is now supported by the aft wall in tension. If you use wooden spacers (per AC43.13-2b) then the box carries the forces as it was originally designed to.

JMO...

Oh, btw, I installed the Odyssey in 2012, now over 6 years ago and it's still going strong.

6643 wrote: ↑Mon Jun 11, 2018 3:13 pm I would be concerned with the installation documented in the above 337. Attaching the bracket to the aft wall of the battery box changes the forces at play in a frontal crash. Instead of being supported by the forward wall of the battery box, and the aft battery box attachments in shear, the force is now supported by the aft wall in tension. If you use wooden spacers (per AC43.13-2b) then the box carries the forces as it was originally designed to.

JMO...

Oh, btw, I installed the Odyssey in 2012, now over 6 years ago and it's still going strong.

Yeup! Forgot to mention, I added blocks of wood between the bracket and the front of the box.. So if it goes anywhere, it's all or nothing.. And I've been pretty happy with the Odyssey battery. So much, I"m putting one in the airmaster soon.

Belt and suspenders! :thumb

Well, last night was a fun time. I got over the hurdles with my IA re: not needing a 337 for the RG25-XC. I got the new battery and went to put it in and surprise, there was not a Gill G25 even installed even though the last log entry stating a battery was installed was in 2013 and listed as a Gill. It was an Odyssey PC545 and they used a creative solution for keeping the battery in place. I have attached a picture.

Upon looking at the battery box, I think it is bigger than the original one from the factory. Does anyone have dimensions on the correct battery box and how the battery is supposed to be secured? I have not yet dug through the 100 series manual to see if it is like the 150 or not.

I'm putting in the Concorde but will need to solve this somehow. Feedback welcome.

"25" batteries used to be the size of today's "35" batteries. The RG-35 would fit correctly, but it's overkill.

Refer to AC43.13-2b for how to fit the battery. (Wooden blocks). Make sure your blocks have lips on them so the battery is held down as well as side to side.

Is that a battery tender connection? Where's the fuse? (Should be as close to the battery as possible!)

6643 wrote: ↑Tue Jun 12, 2018 3:43 pm "25" batteries used to be the size of today's "35" batteries. The RG-35 would fit correctly, but it's overkill.

Refer to AC43.13-2b for how to fit the battery. (Wooden blocks). Make sure your blocks have lips on them so the battery is held down as well as side to side.

Is that a battery tender connection? Where's the fuse? (Should be as close to the battery as possible!)

It is but came installed on the plane. Never used it and I’m probably going to pull it. Thanks for the wood block tip on the AC. Had not had a chance to read it all yet.

Thanks