Retainer Rings
No failure report names the retainer rings. 3 FAA approvals let 2 companies make a replacement retainer rings, C & B Aviation holding the most (2).
Approved replacement parts 3 parts manufacturer approvals
A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a retainer rings and sell it as an approved part for the models named. These are the companies holding such approvals for a retainer rings:
| Maker | Part | Replaces | Fits | Granted | Status |
|---|---|---|---|---|---|
| B&B Manufacturing LLC | Retainer Rings CB-14 | Modification Part | Lycoming Engine TIO-541-E1A4, E1B4, & E1C4 | 2007-06-20 | current |
| C & B Aviation | Retainer Rings CB-14 | Modification Part | Lycoming Engine TIO-541-E1A4, E1B4, & E1C4 | 2007-06-20 | current |
| C & B Aviation | Retainer Rings CB-14 | Modification Part | Lycoming TIO-5541-E1A4, E1B4, & E1C4 | 2006-12-10 | 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.