Lock Nut
17 failure reports named the lock nut in the last ten years, 55 since 1995, most often on the Cirrus SR20; the condition most often found was "loose". 27 FAA approvals let 13 companies make a replacement lock nut, Aerocess, INC holding the most (6).
Reports by year
Reports by year, as a table
| reports | |
|---|---|
| 1995 | 1 |
| 1996 | 1 |
| 1997 | 2 |
| 1998 | 1 |
| 2005 | 1 |
| 2006 | 2 |
| 2007 | 2 |
| 2008 | 2 |
| 2011 | 1 |
| 2012 | 2 |
| 2013 | 8 |
| 2014 | 5 |
| 2015 | 10 |
| 2016 | 3 |
| 2019 | 3 |
| 2023 | 3 |
| 2025 | 3 |
| 2026 | 5 |
Which system the reports file it under last ten years
Reports by system, as a table
| reports | |
|---|---|
| Engine | 6 |
| Airframe structure | 4 |
| Flight controls | 2 |
| Landing gear | 2 |
| Rotorcraft systems | 2 |
| Propeller | 1 |
Models most often reporting it last ten years
How it failed the condition found, last ten years
loose5defective2failed2missing2corroded1cracked1disconnected1undertorqued1unknown1wrong part1
Conditions found, as a table
| reports | |
|---|---|
| loose | 5 |
| defective | 2 |
| failed | 2 |
| missing | 2 |
| corroded | 1 |
| cracked | 1 |
| disconnected | 1 |
| undertorqued | 1 |
| unknown | 1 |
| wrong part | 1 |
Engines most often reporting it
Approved replacement parts 27 parts manufacturer approvals
A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a lock nut and sell it as an approved part for the models named. These are the companies holding such approvals for a lock nut:
Aerocess, INC 6Rotair Industries INC 5Aeroprop INC 3Aerocess INC 3Aviation Materials Management INC 2Turbine Kinetics INC, A Heico Aerospace Company 1Tulsa Heliparts INC 1Kelly Aerospace Energy Systems LLC 1Hartzell Engine Technologies LLC 1Aviation Materials Management, INC. 1Aviation Materials Management, INC 1Aviation Component Solutions 1Aero Accessories INC 1
For these models most: Boeing 737 (4), Sikorsky S-61 (3), Sikorsky S-64 (2), Bell 47 (1), Airbus A300 (1), Airbus Helicopters AS-365 (1).
| Maker | Part | Replaces | Fits | Granted | Status |
|---|---|---|---|---|---|
| Hartzell Engine Technologies LLC | Lock Nut AB-382936 | Continental10-382936 | Lycoming Engines O-320-H1AD, -H2AD, -H3AD | 2023-12-08 | current |
| Aerocess, INC | Lock Nut APA-880-1 | A-880-1 | Hartzell Propeller Inc. HC-B3T, HC-B4T | 2023-07-31 | current |
| Aerocess, INC | Lock Nut APA2043-1 | A2043-1 | Hartzell Propeller Inc. (B, C, D)HC-C2Y(D)HC-E2Y | 2023-07-31 | current |
| Aerocess, INC | Lock Nut ACA-1373 | A-1373 | Hartzell Propeller Inc. HC-B3M, HC-B3P, HC-B3R | 2023-07-31 | current |
| Aerocess, INC | Lock Nut APB-3359 | B3359 | Hartzell Propeller Inc. HC-C2Y, (B, C | 2023-07-31 | current |
| Aerocess, INC | Lock Nut ACB-3807 | B-3807 | Hartzell Propeller Inc. HC-E2Y, HC-F2Y, (E | 2023-07-31 | current |
| Aerocess, INC | Lock Nut ACA2044 | A-2044 | Hartzell Propeller Inc. HC-C2Y, (B, C | 2023-07-31 | current |
| Turbine Kinetics INC, A Heico Aerospace Company | Lock Nut A5351028120000KT | A5351028120000 | Airbus SAS A300 Model B4-203, A300 Model... | 2022-10-04 | current |
| Kelly Aerospace Energy Systems LLC | Lock Nut AB-382936 | Continental Motors P/N 10-382936 | Textron Lycoming O-320-H1AD, -H2AD, -H3AD | 2015-05-14 | current |
| Aviation Materials Management, INC | Lock Nut 273A1118-1 | 273A1118-1 | Boeing 737-600 Series, 737-700 Series,... | 2015-02-12 | current |
| Aviation Materials Management, INC. | Lock Nut 273A1118-1 | 273A1118-1 | Boeing 737-600 Series, 737-700 Series,... | 2014-09-04 | current |
| Aviation Materials Management INC | Lock Nut 273A1118-1 | 273A1118-1 | Boeing 737-600 Series, 737-700 Series,... | 2013-02-26 | current |
| Aviation Component Solutions | Lock-nut P01084 | Goodrich P/N 800691 Installed in Goodrich main... | Airbus Helicopters SA-365N, SA-365N1, AS-365N2 | 2012-05-23 | current |
| Aviation Materials Management INC | Lock Nut 273A1118-1 | 273A1118-1 | Boeing 737-600 Series, 737-700 Series,... | 2010-10-05 | current |
| Aero Accessories INC | Lock Nut 82-50124 | Airborne lock nut and Aero Accessories lock... | Franklin Engine Co. Any engine series where Airborne... | 1999-10-17 | current |
| Tulsa Heliparts INC | Lock Nut Mast (Main) 90-130-116-1 | Bell 47-130-116-1 | Bell 47B, 47B3, 47D | 1996-01-10 | current |
| Aeroprop INC | Lock Nut APA2043-1 | Hartzell A2043-1 | Hartzell BHC-J2Y (TC P37EA) HC-C2Y, BHC-C2Y, CHC-C2Y | 1995-04-25 | current |
| Aeroprop INC | Lock Nut APB-3B07 | Hartzell B3807 | Hartzell HC-E2Y (TC PSEA) HC-F2Y (TC P27EA)... | 1995-04-25 | current |
| Aeroprop INC | Lock Nut APA-1373 | Hartzell A-1373 | Hartzell HC-B4T (TC P40EA), -B4W (TC P10EA),... | 1995-04-25 | current |
| Rotair Industries INC | Lock Nut R6130-62057-1 | Sikorsky S6130-62057-1 | Sikorsky S-61A, S-61L, R | 1995-01-09 | current |
| Aerocess INC | Lock Nut APB-3359 | Hartzell B3359 | Hartzell HC-E3Y, HC-I3Y (T.C. P33EA) EHC-L3Y,... | 1994-12-21 | current |
| Aerocess INC | Lock Nut APA-880-1 | Hartzell A-880-1 | Hartzell HC-B3T (T.C. P15EA) HC-B4T (T.C. P40EA) | 1994-12-21 | current |
| Aerocess INC | Lock Nut APA2043-1 | Hartzell A2043-1 | Hartzell HC-C2Y, BHC-C2Y, CHC-C2Y | 1994-12-21 | current |
| Rotair Industries INC | Lock Nut R1510-24237-0 | Sikorsky S1510-24237-0 | Sikorsky S-64A | 1993-08-03 | current |
| Rotair Industries INC | Lock Nut R1510-24237-0, Dwg.... | S1510-24237-0 | Sikorsky S64A (T.C. H1EA) | 1993-08-03 | current |
| Rotair Industries INC | Lock Nut R1565-90120-0, Dwg.... | S1565-90120-0 | Sikorsky S61N/NM/R (T.C. 1H15) | 1993-05-05 | current |
| Rotair Industries INC | Lock Nut R1565-90120-0 | Sikorsky S1565-90120-0 | Sikorsky S-61N, NM, R | 1993-05-05 | 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.