Third Stage
No failure report names the third stage. 5 FAA approvals let 3 companies make a replacement third stage, Turbine Kinetics INC, Subsidiary of Heico CORP holding the most (2).
Approved replacement parts 5 parts manufacturer approvals
A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a third stage and sell it as an approved part for the models named. These are the companies holding such approvals for a third stage:
| Maker | Part | Replaces | Fits | Granted | Status |
|---|---|---|---|---|---|
| Jet Avion Corporation A Heico Aerospace Company | Third Stage Ring, Air Sealing Assy of, Turbine M8A2726 | Pratt & Whitney P/N 8A2726 | Pratt & Whitney... PW2037, PW2037M, PW2040 | 2020-07-22 | current |
| Turbine Kinetics INC, Subsidiary of Heico CORP | Third Stage LPT Inner Shroud Pin KT-1122 | 795365 | Pratt & Whitney JT9D-7R4D, -7R4D1, -7R4E | 2001-07-10 | current |
| Mcclain International INC | Third Stage, Seal Segment M2735 | P&W 8A2735 | Pratt & Whitney PW2037, 2037(M), 2040 | 1994-05-17 | current |
| Mcclain International INC | Third Stage, Seal Segment M2734 | P&W 8A2734 | Pratt & Whitney PW2037, 2037(M), 2040 | 1994-05-17 | current |
| Turbine Kinetics INC, Subsidiary of Heico CORP | Third Stage LPT Inner Shroud Pin KT-1122 | P&W 795365 | Pratt & Whitney JT9D-7R4D, 7R4D1, 7R4E | 1994-03-01 | 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.