PAI 700 Vertical card compass FAA form 337

[hharney]

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

[n86121]

From my first helicopter onwards.

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