PAI 700 Vertical card compass FAA form 337
 

Hello all. I installed a PAI 700 compass in my 1965 C337 and need the approval data (FAA Form 337) if anyone has it?? The compass is TSO'd but the approved data for installing is required. I'm sure the many Skymasters out there someone has updated their "Whiskey" compass and probably purchased the PAI 700 if you have and are willing to send me your data I'd appreciate it!
Thanks, BILLS bstory@pa.rr.com:

I have never seen any requirement for the vertical card compass replacement. It meets the FAA requirements for compass so there should be no problem. It is TSO'd, nothing required. The log entry is no different than replacing the landing light or battery

PAI 700 Vertical card compass FAA form 337
 

Herb.
The TSO is just the document for the part to be allowed to be installed into an airplane. BUT it doesn't approve for the actual install, ie, Form 337 approved data. I ran into this problem on my C172 when I installed a TSO'd electric tach, the local FSDO would not allow the install without approved documentation, ie, Field approval through a designated maintenance engineer. Or a Form 337.
BILLS

Compass is required equipment per TC - but any approve compass should meet that requirement. I would not see a need for a "Major Alteration" 337 form.

A&P, log book entry, equipment list modification, and reference to W&B (likely no wt chg) W&B & Equip list should be current and in the Aircraft. Oh, and don't forget Compass Correction Card

I have always used vertical compass
 

From my first helicopter onwards.

But these days, with redundant GPS on board, which always display compass headings,
less critical.