 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
airlion(at)bellsouth.net
Guest
|
 Posted: Sat Sep 06, 2008 11:40 am Post subject: wt and balance |
 |
|
I have just installed a skytec starter and a light weight alternator. I have removed about 20 pounds from the front end ,and now I am worried that I will be too tail heavy to carry any luggage. Oh, I have a cessna 140 with a C90.....Is it possible to move the battery to ahead of the firewall? Frustrated because I like to carry camping gear behind the seats. I have not done a compleat wt n balance yet ,but with full fuel the tail weighs 90 lbs. Any feedback would be greatly appreciated. Gardiner Mason
[quote][b]
| | - The Matronics Cessna-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?Cessna-List |
|
|
|
| Back to top |
|
 |
dmedd(at)telus.net
Guest
|
| Posted: Sat Sep 06, 2008 4:39 pm Post subject: wt and balance |
|
|
Yes, sounds like you need some help with this.
Your mechanic will need to enter the removal and replacement of the starter and alternator. The STC instructions likely include a note to amend the weight and balance. There will be moment arms, weight of the components removed, and weight of the components installed that need to be calculated in the amendment.
The alternative to the calculated weight and balance amendment is to reweigh the airplane as you refer to in your post. There are specific procedures for that too. The fuel quantity has to be known precisely, but even better is to drain all fuel. The aircraft needs to be leveled per the service manual before weighing. You don't mention if the tail was on the ground when you weighed it, or the airplane was level. The manual will call for the plane to be leveled to a certain reference, which turns out to be near a level flight attitude.
Once the new weight and balance are determined, then you can do some sample calculations to see if the airplane is within limits with a typical load for your mission.
Daryl
[quote] ---
| | - The Matronics Cessna-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?Cessna-List |
|
|
|
| Back to top |
|
|
airlion(at)bellsouth.net
Guest
|
| Posted: Sun Sep 07, 2008 6:24 am Post subject: wt and balance |
|
|
Daryl, thanks for getting back to me. The plane was weighed with full tanks ina level attitude and it came in 5 lbs heavier than it was before replacing the starter and alt. with the light weight. I don't know the CG yet, but I suspect it is going further aft. With that in mind, do you know if you can get a field approval to mov the battery forward. It seems to me that the STC's. for the starter and alt. would address these issues. Cheers, Gardiner Mason
[quote] ---
| | - The Matronics Cessna-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?Cessna-List |
|
|
|
| Back to top |
|
|
dmedd(at)telus.net
Guest
|
| Posted: Sun Sep 07, 2008 7:22 am Post subject: wt and balance |
|
|
Just google FAA STC and you'll come to a page where you can search for a list of every STC ever approved for the 140. I don't know off hand if there is a battery moving STC. I responded to your question mostly because it is so important that you amend the weight and balance for your aircraft. You need that information to ensure that you don't end up loaded out of limits and encounter handling difficulties. I'm not licensed to do it for you, and it's something that you need to be with the airplane to complete.
[quote] ---
| | - The Matronics Cessna-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?Cessna-List |
|
|
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
