The International Cessna^® 170 Association

I'm interested in replacing the 26A generator in my 1952 C170B with an alternator. There are already several posts regarding electrical systems, and two of the three topics have no reply. Here are links to them:

http://www.cessna170.org/phpBB2/viewtopic.php?t=145
http://www.cessna170.org/phpBB2/viewtopic.php?t=160
http://www.cessna170.org/phpBB2/viewtopic.php?t=39

I sent a note to Tom Hall about wanting to upgrade to an alternator, but thought I would open it up for wider discussion. I haven't seen any of the STC's or 337's, so am not sure if bus loads, bladed circuit breakers, and other issues are discussed in them. Here's my note to Tom, any feedback would be appreciated.

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Hi, Tom. I just joined TIC170A and am delighted to see a number of STC's are available for 75 cents apiece. I've owned N2449D, a 1952 Cessna 170B, serial numbe 20601, since late January this year. I've been struggling along with a generator that was apparently remanufactured by Aero Electric, part #1101879, serial number A109174. The data plate says it's 12V and 26A. The 337s/STCs available from HQ include the following items that apply to C170B's:

* 20 AMP GEN TO 60 AMP ALT (170B)
* 35 AMP GEN TO 60 AMP ALT (170A-B)
* *50 AMP ALT, JASCO (170-A-B)
* 6 AMP ALT (170-A-B)

My mechanic turned up the following in his STC search:

STC SEARCH
STCNumber SA00202NY
Manufacturer CESSNA
MakeModel 170, 170A, 170B
TCNumber A-799
Description Installation of alternator system on Cessna170, 170A, & 170B with Continental engine C145-2 and O-300-A.
Status Issued 7/15/94
ACO NE-NY
STCHolder
Barnstormers Aviation
911 Sportsman Neck Road
Queenstown MARYLAND 21658

I've tried locating Barnstormers Aviation but haven't had any luck. Can you recommend which STC or 337 I should pursue? Thanks much!

Rich Faust
Richmond, TX

Thanks to Tom Hall for his prompt reply. Here it is...

Rich,
The 60 amp alt can be installed using the information contained in the Cessna Service kit SK172-22F with a field approval or you can buy the use of the STC held by Barnstormers Aviation (tele 410-827-7896). The cost for their STC is currently $85.00. Or you could use the Jasco 50 Amp alt and that is available from Chief Aircraft, Aircraft Spruce or Wag Aero. This kit includes the STC. By the time you you pay a core charge for the Cessna/Ford Alternator the cost is pretty much the same. Just make sure that all the wiring is changed and circuit breakers are installed. When you change to an alternator use the old style coupler, it is a lot cheaper than the new model, see Continental Service Bulletin SB95-3A.

A note: by law, now you must have permission from the owner of the STC in order for the FAA to accept it. So any copies of STC's from any source other than the owner are not valid or usable.

Happy Landings,

Tom