The U.S. aircraft register, updated daily
Parts

Back Up

No failure report names the back up. 42 FAA approvals let 15 companies make a replacement back up, Hrd Aerosystems INC holding the most (14).

Approved replacement parts 42 parts manufacturer approvals

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

Hrd Aerosystems INC 14Trelleborg Sealing Solutions 6Pacific Propeller INC 4Bas Incorporated 3Seal Dynamics INC 2Hemico INC. 2General Pneumatics Inflation Systems LLC 2Apical Industries, INC. DBA Dart Aerospace 2Wencor, LLC 1Wencor LLC 1Spirit Aerosystems INC 1Kinetic Structures Corporation 1Gemini Engineering 1Gm Nameplate 1Cub Crafters INC 1

For these models most: Boeing 757 (13), Boeing 767 (8), Boeing 747 (5), Boeing 737 (5), Cessna T337 (2), Cessna P337 (2), Cessna M337 (2), Cessna 337 Skymaster (2), Cessna 336 (2), Airbus A320 (2), Airbus A300 (2), Agusta Aerospace Corp AW139 (2).

MakerPartReplacesFitsGrantedStatus
Hemico INC.Back-Up Ring HEM68-155168-1551De Havilland... DHC-8-400 Series2024-10-17current
Hemico INC.Back-Up Ring HEM56-117856-1178De Havilland... DHC-8-400 Series2024-10-17current
Wencor, LLCBack-Up Seal 337-081-301-0WE337-081-301-0CFM International CFM56-5B1/3, CFM56-5B2/3, CFM56-5B3/32022-10-25current
Apical Industries, INC. DBA Dart AerospaceBack-up Handle and Cable Assy 651.98013G2560V02032Agusta AW1392018-04-08current
Wencor LLCBack-Up Seal 337-081-301-0WE337-081-301-0CFM International, S.A. CFM56-5B1, CFM56-5B1/P, CFM56-5B1/2P2017-11-19current
Apical Industries, INC. DBA Dart AerospaceBack-up Handle and Cable Assy 650.88033G2560V02031Agusta AW1392017-09-25current
General Pneumatics Inflation Systems LLCBack-Up Ring GP1BT012GP1BT012Boeing 737-100, 200, 3002016-12-13current
General Pneumatics Inflation Systems LLCBack-Up Ring GP1BT011GP1BT011Boeing 737-100, 200, 3002016-12-13current
Hrd Aerosystems INCBack-Up Ring 680119-11H680119-11Boeing 767, 767-200 Series, 767-300 Series2015-02-03current
Hrd Aerosystems INCBack-Up Ring 680118-115H680118-115Boeing 767, 767-200 Series, 767-300 Series2015-02-03current
Hrd Aerosystems INCBack-Up Ring 680123-8H680123-8Boeing 737, 737-100 Series, 737-200 Series2015-02-03current
Trelleborg Sealing SolutionsBACK-UP RING BACR12BM343BACR12BM343THE BOEING COMPANY 747-200B SERIES, 747-200C SERIES,...2013-04-28current
Trelleborg Sealing SolutionsBACK-UP RING BACR12BM348BACR12BM348THE BOEING COMPANY 747-100 SERIES, 747-200B SERIES,...2013-04-28current
Trelleborg Sealing SolutionsBACK UP RING BACR12BM121BACR12BM121THE BOEING COMPANY 767-200 SERIES, 767-300 SERIES,...2013-04-28current
Trelleborg Sealing SolutionsBACK-UP, RING BACR12BP325BACR12BP325THE BOEING COMPANY 747-400 SERIES2013-04-28current
Trelleborg Sealing SolutionsBACK-UP, RING BACR12BP326BACR12BP326THE BOEING COMPANY 777-200 SERIES2013-04-28current
Trelleborg Sealing SolutionsBACK-UP, RING BACR12BP326BACR12BP326THE BOEING COMPANY 767-400ER SERIES2013-04-28current
Bas IncorporatedBack Up Channel PN 1-B-177-1,-3Modification PartCessna 177, 177A, 177B2011-07-18current
Bas IncorporatedBack Up Plate PN 5-337Modification PartCessna 336, 337, 337A2011-07-18current
Spirit Aerosystems INCBACK-UP RING 69-69875-169-69875-1Boeing 737-200 SERIES, 737-200C SERIES,...2010-07-22current
Hrd Aerosystems INCBack Up Ring H8011102580111025The Boeing Company 757-200 Series, 757-300 Series2010-02-02current
Hrd Aerosystems INCBack Up Ring H8011102480111024The Boeing Company 757-200 Series, 757-300 Series2010-02-02current
Hrd Aerosystems INCBack Up Ring H2902315429023154The Boeing Company 757-200 Series, 757-300 Series2010-02-02current
Hrd Aerosystems INCBack Up Ring H2902315729023157The Boeing Company 757-200 Series, 757-300 Series2010-02-02current
Hrd Aerosystems INCBack Up Ring H2902314729023147The Boeing Company 757-200 Series, 757-300 Series2010-02-02current
Hrd Aerosystems INCBack Up Ring H2902315329023153The Boeing Company 757-200 Series, 757-300 Series2010-02-02current
Hrd Aerosystems INCBack Up Ring H2902344429023444The Boeing Company 757-200 Series, 757-300 Series2010-02-02current
Hrd Aerosystems INCBack Up Ring H8011102880111028The Boeing Company 757-200 Series, 757-300 Series2010-02-02current
Hrd Aerosystems INCBack Up Ring H2902315529023155The Boeing Company 757-200 Series, 757-300 Series2010-02-02current
Hrd Aerosystems INCBack Up Ring H2902341929023419The Boeing Company 757-200 Series, 757-300 Series2010-02-02current
Hrd Aerosystems INCBack Up Ring H8011101980111019The Boeing Company 757-200 Series, 757-300 Series2010-02-02current
Seal Dynamics INCBack-Up Ring 326791-014SDGoodrich Actuation Systems 326791-014Airbus A300-600 series2009-07-13current
Kinetic Structures CorporationBack Up Plate P1009Barry Controls R18924-1McDonnell Douglas DC-9-11, DC-9-12, DC-9-132009-04-05current
Seal Dynamics INCBack-up Ring 326791-014SDGoodrich Actuation Systems 326791-014Airbus A300 series A310 series2009-03-19current
Bas IncorporatedBack Up Plate 5-337Modification PartCessna 336, 337, 337A2008-07-28current
Gm NameplateL3448 BACK UP LIGHT BAC27TEL55BAC27TEL55Boeing 767 Series2006-01-27current
Pacific Propeller INCBack-up Ring Torque Cylinder 68518046851804Pacific Propeller Aeroproducts A6441FN 606/606A2005-06-27current
Pacific Propeller INCBack-up Ring 65289666528966Pacific Propeller Aeroproducts A6441FN 606/606A2005-06-27current
Gemini EngineeringBACK-UP RING 69-69875-169-69875-1Boeing 737-200 SERIES, 737-200C SERIES,...2003-10-05current
Pacific Propeller INCBack-up Ring Torque Cylinder 68518046851804Pacific Propeller Aeroproducts A6441FN 606/606A2001-09-13current
Pacific Propeller INCBack-up Ring 65289666528966Pacific Propeller Aeroproducts A6441FN 606/606A2001-09-13current
Cub Crafters INCBack Up Angle 101310Modification PartPiper PA-18, -18S, -18 1052001-09-04current

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.