Dampener Spring
No failure report names the dampener spring. 5 FAA approvals let 2 companies make a replacement dampener spring, Seal Dynamics INC holding the most (4).
Approved replacement parts 5 parts manufacturer approvals
A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a dampener spring and sell it as an approved part for the models named. These are the companies holding such approvals for a dampener spring:
For these models most: Boeing 767 (2), Airbus A330 (2), Airbus A321 (2), Airbus A320 (2), Pilatus PC-12 (1), Mitsubishi MU-2 (1), Embraer EMB-110 (1), Dehavilland DHC-6 (1), British Aerospace HS 125 (1), Boeing 787 Dreamliner (1), Boeing 777 (1), Boeing 757 (1).
| Maker | Part | Replaces | Fits | Granted | Status |
|---|---|---|---|---|---|
| Seal Dynamics INC | Dampener-Spring SP20523SD | SP20523 | The Boeing Company 767-400ER Series, 787-10 | 2026-06-26 | current |
| Seal Dynamics INC | Dampener-Spring SP20523SD | SP20523 | Airbus SAS A320-233, A321-211, A330-203 | 2026-06-26 | current |
| Seal Dynamics INC | Dampener-Spring SP20523SD | SP20523 | Airbus SAS A320-271N, A321-231, A330-243 | 2025-10-17 | current |
| Seal Dynamics INC | Dampener-Spring SP20523SD | Goodrich P/N SP20523 | The Boeing Company 757-200 Series, 767-300 Series,... | 2018-10-25 | current |
| Naasco Northeast CORP | Dampener Spring N23032- 1910 | Lucas (LSI) 23032-1910 | Bell 47G series, 412, 206A & B | 2005-12-29 | 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.