Stud Engine
No failure report names the stud engine. 4 FAA approvals let 1 company make a replacement stud engine, Yesteryear Aviation INC holding the most (4).
Approved replacement parts 4 parts manufacturer approvals
A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a stud engine and sell it as an approved part for the models named. These are the companies holding such approvals for a stud engine:
For these models most: Boeing IB75 (4), Boeing E75 Stearman Kaydet (4), Boeing D75 (4), Boeing B75 Stearman Kaydet (4), Boeing A75 Stearman Kaydet (4), Boeing 75 (4).
| Maker | Part | Replaces | Fits | Granted | Status |
|---|---|---|---|---|---|
| Yesteryear Aviation INC | Stud-Engine Mount STD. YA73-2131-STD | 73-2131 | Boeing A75L3, 75 (Army PT-13), A75 (Army PT-13A | 2020-01-27 | current |
| Yesteryear Aviation INC | Stud-Engine Mount +.008 Oversize Thread YA73-2131-008 | 73-2131 | Boeing A75L3, 75 (Army PT-13), A75 (Army PT-13A | 2020-01-27 | current |
| Yesteryear Aviation INC | Stud-Engine Mount-Step Stud 1/2-7/16 YA73-2131-STEP | 73-2131 | Boeing A75L3, 75 (Army PT-13), A75 (Army PT-13A | 2020-01-27 | current |
| Yesteryear Aviation INC | Stud-Engine Mount +.004 Oversize Thread YA73-2131-004 | 73-2131 | Boeing A75L3, 75 (Army PT-13), A75 (Army PT-13A | 2020-01-27 | current |
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.