The U.S. aircraft register, updated daily
Parts · Airframe structure

Lock Ring

1 failure reports named the lock ring in the last ten years, 18 since 1995, most often on the Boeing 737; the condition most often found was "missing". 37 FAA approvals let 20 companies make a replacement lock ring, Hrd Aerosystems INC holding the most (4).

Reports by year

012341995201112016
Reports by year, as a table
reports
19952
19962
19974
19992
20051
20111
20123
20131
20141
20161

Which system the reports file it under last ten years

Airframe structure1
Reports by system, as a table
reports
Airframe structure1

Models most often reporting it last ten years

Boeing 7371
Models most reported, as a table
reports
Boeing 7371

How it failed the condition found, last ten years

missing1
Conditions found, as a table
reports
missing1

Approved replacement parts 37 parts manufacturer approvals

A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a lock ring and sell it as an approved part for the models named. These are the companies holding such approvals for a lock ring:

Hrd Aerosystems INC 4Aviation Materials Management INC 4Aviation Materials Management, INC 3Vision Air INC 2Spirit Aerosystems INC 2Rotair Industries INC 2Pacific Sky Supply INC 2Mcfarlane Aviation INC. 2Mcfarlane Aviation INC 2Goodrich Landing Gear 2Dynatech Aerospace INC 2Aviation Materials Management, INC. 2Woodward Hrt, INC 1Univair Aircraft CORP 1Turbine Kinetics INC, A Heico Aerospace Company 1Gemini Engineering INC 1Gemini Engineering 1Ge Aviation LLC (Formerly Smiths Aerospace) 1Dec Technologies INC 1Berkley International INC 1

For these models most: Boeing 767 (12), Boeing 747 (4), Boeing 737 (4), Boeing 757 (3), Sikorsky S-64 (2), Cessna T210 Turbo Centurion (2), Cessna R172 Hawk XP (2), Cessna A152 (2), Cessna A150 (2), Cessna 172 Skyhawk (2), Cessna 152 (2), Cessna 150 (2).

MakerPartReplacesFitsGrantedStatus
Hrd Aerosystems INCLock Ring H208255208255The Boeing Company 737-900ER Series2026-03-09current
Hrd Aerosystems INCLock Ring H208255208255Gulfstream Aerospace... GIV-X2025-12-04current
Mcfarlane Aviation INC.LOCK RING, Nose Strut MC0841200-250841200-25Textron Aviation Inc. R172E (USAF T-41B) (USAF T-41C or...2024-06-24current
Mcfarlane Aviation INC.LOCK RING MC0841200-190841200-19Textron Aviation Inc. R172E (USAF T-41B) (USAF T-41C or...2024-06-24current
Hrd Aerosystems INCLock Ring H22152-0122152-01The Boeing Company 737-900 Series, 737-8, 737-92023-10-19current
Aviation Materials Management, INCLOCK RING ASSY 273N1105-1273N1105-1Boeing 757-200 SERIES, 757-200CB SERIES,...2021-03-24current
Woodward Hrt, INCLock Ring 1165-121165-12Boeing 737-100 Series, 737-200 Series,...2019-06-20current
Turbine Kinetics INC, A Heico Aerospace CompanyLock Ring DEC09-072-501Pratt & Whitney P/N 519834Pratt & Whitney JT8D-1, -1A, -1B2016-02-17current
Aviation Materials Management, INCLock Ring 161T1195-2161T1195-2Boeing 767-200 Series, 767-300 Series,...2015-02-12current
Aviation Materials Management, INCLock Ring Assy 161T1195-1161T1195-1Boeing 767-200 Series, 767-300 Series,...2015-02-12current
Pacific Sky Supply INCLock Ring, Turbine Blade 6843872P-46843872P-4Rolls-Royce 501-D22, -D22A, -D22C2014-12-07current
Pacific Sky Supply INCLock Ring, Turbine Blade 6843872P-56843872P-5Rolls-Royce 501-D22, -D22A, -D22C2014-12-07current
Aviation Materials Management, INC.Lock Ring Assy 161T1195-1161T1195-1Boeing 767-200 Series, 767-300 Series,...2014-09-04current
Aviation Materials Management, INC.Lock Ring 161T1195-2161T1195-2Boeing 767-200 Series, 767-300 Series,...2014-09-04current
Mcfarlane Aviation INCLOCK RING, Nose Strut MC0841200-250841200-25Cessna 150 s/n all, 150A s/n all, 150B s/n all2013-10-29current
Mcfarlane Aviation INCLOCK RING, Nose Strut MC0841200-190841200-19Cessna 150 s/n all, 150A s/n all, 150B s/n all2013-10-29current
Aviation Materials Management INCLock Ring 161T1195-2161T1195-2Boeing 767-200 Series, 767-300 Series,...2013-02-26current
Aviation Materials Management INCLock Ring Assy 161T1195-1161T1195-1Boeing 767-200 Series, 767-300 Series,...2013-02-26current
Aviation Materials Management INCLock Ring 161T1195-2161T1195-2Boeing 767-200 Series, 767-300 Series,...2010-10-05current
Aviation Materials Management INCLock Ring Assy 161T1195-1161T1195-1Boeing 767-200 Series, 767-300 Series,...2010-10-05current
Gemini EngineeringLOCK RING 69B80020-169B80020-1Boeing 747-100 Series, 747-200B Series,...2009-11-15current
Gemini Engineering INCLOCK RING 69B80020-169B80020-1Boeing 747-100 Series, 747-200B Series,...2009-11-15current
Goodrich Landing GearLOCK RING 162W1544-1162W1544-1Boeing 777-300ER SERIES2008-11-24current
Goodrich Landing GearLOCK RING 162W1544-1162W1544-1Boeing 777-300ER SERIES2008-11-24current
Ge Aviation LLC (Formerly Smiths Aerospace)Lock Ring 1452-0111452-011Boeing 737-600 series, 737-700 series,...2007-11-07current
Spirit Aerosystems INCLOCK RING 69B91055-269B91055-2Boeing 747-100 SERIES, 747-100B SERIES,...2007-03-02current
Univair Aircraft CORPLock Ring UA85-218B.F.Goodrich A85-218, Piper 750 026, Ercoupe A-85-21Piper J3C-40, J3C-50, J3C-652007-01-08current
Hrd Aerosystems INCLock Ring H208255208255Aerospatiale ATR72-101, ATR72-201) Gulfstream...2006-04-10current
Spirit Aerosystems INCLOCK RING 69B91055-269B91055-2Boeing 747-100 SERIES, 747-100B SERIES,...2005-11-30current
Dec Technologies INCLock Ring DEC09-072-501519834Pratt & Whitney JT8D-1, -1A, -1B2004-07-07current
Vision Air INCLock Ring VA-1-100-423-01Lycoming 1-100-423-01Textron Lycoming T5311, T5313, T53172002-04-28current
Berkley International INCLock Ring B4571325001-1MPC 325-4571-001 ABoeing 767-2001998-07-26current
Vision Air INCLock Ring VA-1-100-423-01Lycoming 1-100-423-01Textron Lycoming T5311, T5313, T53171998-07-23current
Rotair Industries INCLock-Ring R1565-61308Sikorsky S1565-61308Sikorsky S-58B/BT/F/FT (TC 1H11), S-61N/NM/R...1997-08-05current
Rotair Industries INCLock Ring R1565-64308S1565-64308-0Sikorsky S-64A (TC H1EA) S-64F(TC H6EA)1996-03-30current
Dynatech Aerospace INCLock Ring, Jam Nut CM-2-101-101-01Textron Lycoming 2-101-101-01Honeywell ALF502R1991-07-04current
Dynatech Aerospace INCLock Ring, Accessory Drive CM-2-101-108-01Textron Lycoming 2-101-108-01Honeywell ALF502R1991-07-04current

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.