Valve Spring
3 failure reports named the valve spring in the last ten years, 35 since 1995, most often on the Bombardier CL-600 Challenger and CRJ; the condition most often found was "broken". 10 FAA approvals let 2 companies make a replacement valve spring, Superior Air Parts INC holding the most (6).
Reports by year
Reports by year, as a table
| reports | |
|---|---|
| 1995 | 2 |
| 1997 | 1 |
| 1998 | 5 |
| 2000 | 1 |
| 2001 | 2 |
| 2002 | 2 |
| 2003 | 1 |
| 2007 | 1 |
| 2008 | 1 |
| 2009 | 2 |
| 2010 | 3 |
| 2011 | 1 |
| 2012 | 4 |
| 2013 | 3 |
| 2014 | 1 |
| 2015 | 2 |
| 2017 | 2 |
| 2025 | 1 |
Which system the reports file it under last ten years
Reports by system, as a table
| reports | |
|---|---|
| Engine | 2 |
| Airframe structure | 1 |
Models most often reporting it last ten years
Models most reported, as a table
| reports | |
|---|---|
| Bombardier CL-600 Challenger and CRJ | 1 |
| Cessna 550 Citation II | 1 |
| Cessna U206 Stationair | 1 |
How it failed the condition found, last ten years
Conditions found, as a table
| reports | |
|---|---|
| broken | 1 |
| corroded | 1 |
| worn | 1 |
Engines most often reporting it
Approved replacement parts 10 parts manufacturer approvals
A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a valve spring and sell it as an approved part for the models named. These are the companies holding such approvals for a valve spring:
| Maker | Part | Replaces | Fits | Granted | Status |
|---|---|---|---|---|---|
| Superior Air Parts INC | Outer Valve Spring SL11800 | P/N LW11800, P/N 65427, P/N 76994 | Lycoming Engines O-235-C, -C1, -C1A | 2014-09-17 | current |
| Superior Air Parts INC | Inner Valve Spring SL11795 | P/N LW11750, P/N 65567 | Lycoming Engines O-235-C, -C1, -C1A | 2014-09-17 | current |
| Ram Aircraft Limited Partnership | Valve Spring 1791-1 | TCM P/N 637837 | Teledyne Continental IO-520 A, B, BA | 2008-01-10 | current |
| Ram Aircraft Limited Partnership | Valve Spring 1791-2 | TCM P/N 631521 | Teledyne Continental IO-520-A, B, BA | 2008-01-10 | current |
| Ram Aircraft Limited Partnership | Valve Spring 1791-2 | TCM P/N 631521 | Teledyne Continental IO-520-A, B, BA | 2006-12-03 | current |
| Ram Aircraft Limited Partnership | Valve Spring 1791-1 | TCM P/N 637837 | Teledyne Continental IO-520-A, B, BA | 2006-12-03 | current |
| Superior Air Parts INC | Inner Valve Spring SL-11795 | Avco Lycoming P/N LW11795 | Avco Lycoming,... 0-235-C1, C1B, C2C | 1984-09-04 | current |
| Superior Air Parts INC | Outer Valve Spring SL-11800 | Avco Lycoming P/N LW11800 | Avco Lycoming,... A3B, A3C, B2A | 1984-09-04 | current |
| Superior Air Parts INC | Valve Spring, Outer SL-11796 | Avco Lycoming P/N LW-11796 | Avco Lycoming,... HIO-360-A1A, AI0-360-A1A, A1B | 1984-06-26 | current |
| Superior Air Parts INC | Valve Spring, Inner SL-11797 | Avco Lycoming P/N LW-11797 | Avco Lycoming,... HIO-360-A1A, AI0-360-A1A, A1B | 1984-06-26 | 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.