Quad Ring
No failure report names the quad ring. 7 FAA approvals let 6 companies make a replacement quad ring, Jet Parts Engineering INC holding the most (2).
Approved replacement parts 7 parts manufacturer approvals
A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a quad ring and sell it as an approved part for the models named. These are the companies holding such approvals for a quad ring:
For these models most: Cessna T210 Turbo Centurion (1), Cessna R172 Hawk XP (1), Cessna 182 Skylane (1), Bombardier CL-600 Challenger and CRJ (1), Boeing 767 (1), Boeing 747 (1).
| Maker | Part | Replaces | Fits | Granted | Status |
|---|---|---|---|---|---|
| Mcfarlane Aviation INC. | QUAD RING, Nose Strut Seal 1100 | MS28775-329, AN6227B32 | Textron Aviation Inc. R172E (USAF T-41B) (USAF T-41C or... | 2024-06-24 | current |
| Aerocess, INC | Quad Ring APQ4339 | Q-4339 | Hartzell Propeller Inc. (B, C, D)HC-C2Y | 2023-07-31 | current |
| Turbine Kinetics INC, A Heico Aerospace Company | Quad Ring Q4217-559NKT | Hartwell P/N Q4217-559N | Bombardier Inc. CL-600-2B19, (Regional Jet Series... | 2020-01-28 | current |
| Jet Parts Engineering INC | Quad Ring Q4201-366YJP | Q4201-366Y | Boeing 747-400 Series | 2018-05-28 | current |
| Jet Parts Engineering INC | Quad Ring Q4201-366YJP | Q4201-366Y | The Boeing Company 767-200 Series, 767-300 Series | 2017-08-16 | current |
| Aeroprop INC | Quad Ring APQ4339 | Hartzell Q-4339 | Hartzell BHC-J2Y (TC P37EA) BHC-L2Y, HC-L2Y... | 1995-04-25 | current |
| Aerocess INC | Quad Ring APQ4339 | Hartzell Q-4339 | Hartzell HC-C2Y, BHC-C2Y, CHC-C2Y | 1994-12-21 | 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.