The U.S. aircraft register, updated daily
Parts

Mac Modification

No failure report names the mac modification. 2 FAA approvals let 1 company make a replacement mac modification, Mccoy Avionics CORP holding the most (2).

Approved replacement parts 2 parts manufacturer approvals

A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a mac modification and sell it as an approved part for the models named. These are the companies holding such approvals for a mac modification:

For these models most: Taylorcraft BC12 BC-12D (2), Siai-Marchetti F.260 (2), Piper PA-60 Aerostar (2), Dehavilland DHC-6 (2), Dehavilland DHC-3 (2), Dehavilland DHC-2 (2), Aerostar International Inc S-55 (2), Aerostar International Inc S-51 (2), Aerostar Acft Corp Of Texas M20 (2).

MakerPartReplacesFitsGrantedStatus
Mccoy Avionics CORPMAC 1700 Modification, Transceiver 82-01445-000Modification PartAermacchi S.p.A. F.260, PA-60, DH.1141991-03-06current
Mccoy Avionics CORPMAC 170A Modification, Transceiver 82-FSMOD-000Modification PartAermacchi S.p.A. F.260, PA-60, DH.1141991-03-06current

Sources: the FAA's service difficulty reports since 1995 (a report is a part that failed and was fixed, as filed by an airline, repair station or owner; the count shows reporting as much as reliability) and the parts manufacturer approvals in the FAA's Dynamic Regulatory System. The part name is the reporters' and the approval holders' own words, reduced to the first plain words so that spellings meet.