Valve Gear
No failure report names the valve gear. 3 FAA approvals let 2 companies make a replacement valve gear, Parker Hannifin CORP 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 valve gear and sell it as an approved part for the models named. These are the companies holding such approvals for a valve gear:
For these models most: Boeing 747 (2).
| Maker | Part | Replaces | Fits | Granted | Status |
|---|---|---|---|---|---|
| Eaton Aerospace Sterer Engineering | Valve Gear Emergency Assy. 53620-5 | 6600078-5 | Bombardier Learjet 24, Learjet 25, Learjet 28 | 2022-04-21 | current |
| Parker Hannifin CORP | Valve Assy-Gear Operated Door Sequence 2670296 | 60B00220-1 | Boeing 747-8F Series | 2011-11-14 | current |
| Parker Hannifin CORP | Valve Assy-Gear Operated Door Sequence 2670296 | 60B00220-1 | Boeing 747-8F Series | 2011-11-14 | 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.