The U.S. aircraft register, updated daily
Parts

Autopilot Directional

No failure report names the autopilot directional. 2 FAA approvals let 1 company make a replacement autopilot directional, Sigma Tek INC 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 autopilot directional and sell it as an approved part for the models named. These are the companies holding such approvals for a autopilot directional:

For these models most: Helio H-250 (2), Beechcraft TC-45 (2), Siai-Marchetti F.260 (1), Beechcraft E18 (1), Beechcraft A65 (1), Beechcraft 65 (1).

MakerPartReplacesFitsGrantedStatus
Sigma Tek INCAutopilot Directional Gyro, Model 4000C, and Model 4000C-1 1U262-004-15Century Flight Systems Model Number 52D54 and...Aermacchi S.p.A. F.260, B, S.205-18R1998-05-17current
Sigma Tek INCAutopilot Directional Gyro, Model 4000C, and Model 4000C-1 1U262-003-14Century Flight Systems Model Number 52D54 and...Aerostar Aircraft 600, 601, P1998-05-17current

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.