Thru Bolt
4 failure reports named the thru bolt in the last ten years, 29 since 1998, most often on the Boeing 737; the condition most often found was "loose". 13 FAA approvals let 3 companies make a replacement thru bolt, Hartzell Engine Technologies LLC holding the most (8). The reports call it "thru bolt", "thru-bolt".
Reports by year
Reports by year, as a table
| reports | |
|---|---|
| 1998 | 2 |
| 2001 | 2 |
| 2002 | 3 |
| 2003 | 1 |
| 2004 | 2 |
| 2006 | 1 |
| 2007 | 1 |
| 2008 | 2 |
| 2010 | 1 |
| 2011 | 2 |
| 2012 | 3 |
| 2013 | 4 |
| 2015 | 1 |
| 2017 | 1 |
| 2019 | 1 |
| 2020 | 2 |
Which system the reports file it under last ten years
Reports by system, as a table
| reports | |
|---|---|
| Engine | 2 |
| Landing gear | 1 |
| Airframe structure | 1 |
Models most often reporting it last ten years
Models most reported, as a table
| reports | |
|---|---|
| Boeing 737 | 1 |
| Cessna TU206 | 1 |
| Dassault FALCON 900 | 1 |
How it failed the condition found, last ten years
Conditions found, as a table
| reports | |
|---|---|
| loose | 1 |
| missing | 1 |
| sheared | 1 |
| stripped | 1 |
Engines most often reporting it
Approved replacement parts 13 parts manufacturer approvals
A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a thru bolt and sell it as an approved part for the models named. These are the companies holding such approvals for a thru bolt:
For these models most: Scottish Aviation SERIES 100 (6), Cessna 172 Skyhawk (2).
| Maker | Part | Replaces | Fits | Granted | Status |
|---|---|---|---|---|---|
| Hartzell Engine Technologies LLC | Thru Bolt Retainer 4242 | Ford Motor Co. C8FF-10B383-A | Textron Aviation... 100, 120, 140 | 2022-05-03 | current |
| Hartzell Engine Technologies LLC | Thru Bolt 4243 | Ford Motor Co. C8FF-10A396-A | Textron Aviation... 100, 120, 140 | 2022-05-03 | current |
| Hartzell Engine Technologies LLC | Thru Bolt Retainer 4242 | Ford Motor Company C8FF-10B383-A | Cessna Series 100, 200, 300 Single & Twin Airplanes | 2013-02-24 | current |
| Hartzell Engine Technologies LLC | Thru Bolt 4243 | Ford Motor Co. C8FF-10A396-A | Cessna Series 100, 200, 300 Single & Twin Airplanes | 2013-02-24 | current |
| Hartzell Engine Technologies LLC | Thru Bolt Retainer 4242 | Ford Motor Co. C8FF-10B383-A | Cessna Series 100, 200, 300 Single & Twin Airplanes | 2013-02-24 | current |
| Superior Air Parts INC | Thru-Bolt 1/2-20 UNF SA641931-10.75 | 641931-10.75 | Continental IO-470-C O-470-A, -B, -E | 2011-03-24 | current |
| Superior Air Parts INC | Thru-Bolt 1/2-20 UNF SA641931-9.81 | 641931-9.81 | Continental IO-470-C O-470-A, -B, -E | 2011-03-24 | current |
| Superior Air Parts INC | Thru-Bolt 1/2-20 UNF SA641931-10.94 | 641931-10.94 | Continental IO-470-C O-470-A, -B, -E | 2011-03-24 | current |
| Hartzell Engine Technologies LLC | Thru Bolt Retainer 4242 | Ford Motor Company C8FF-10B383-A | Cessna Series 100, 200, 300 Single & Twin Airplanes | 2010-10-21 | current |
| Hartzell Engine Technologies LLC | Thru Bolt 4243 | Ford Motor Co. C8FF-10A396-A | Cessna Series 100, 200, 300 Single & Twin Airplanes | 2010-10-21 | current |
| Hartzell Engine Technologies LLC | Thru Bolt Retainer 4242 | Ford Motor Co. C8FF-10B383-A | Cessna Series 100, 200, 300 Single & Twin Airplanes | 2010-10-21 | current |
| Superior Air Parts INC | Thru bolt SA641994 | Teledyne Continental Part No. 641994 | Teledyne Continental IO-360-A, C, D | 1995-07-11 | current |
| Electrosystems INC | Thru Bolt 4243 | Ford Motor Company Alternator Thru Bolt C8FF-10A396-A | Cessna Single Engine Aircraft equipped w/ a... | 1991-06-25 | 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.