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

Jam Nut

12 failure reports named the jam nut in the last ten years, 41 since 1995, most often on the Boeing 737; the condition most often found was "loose". 22 FAA approvals let 9 companies make a replacement jam nut, Crane Resistoflex holding the most (8). The reports call it "jam-nut", "jam nut".

Reports by year

01234199520072012201732026
Reports by year, as a table
reports
19951
19991
20011
20031
20062
20072
20083
20093
20104
20114
20122
20132
20142
20151
20162
20171
20181
20221
20241
20253
20263

Which system the reports file it under last ten years

Airframe structure8Flight controls2Landing gear2
Reports by system, as a table
reports
Airframe structure8
Flight controls2
Landing gear2

Models most often reporting it last ten years

Boeing 7374Boeing 7573Airbus A3211Boeing 7471Bombardier CL-600 Challenger and CRJ1Cessna 560 Citation V, Ultra, Encore and Excel1Cirrus SR201
Models most reported, as a table
reports
Boeing 7374
Boeing 7573
Airbus A3211
Boeing 7471
Bombardier CL-600 Challenger and CRJ1
Cessna 560 Citation V, Ultra, Encore and Excel1
Cirrus SR201

How it failed the condition found, last ten years

loose7unsecure2backed out1out of adjust1undertorqued1
Conditions found, as a table
reports
loose7
unsecure2
backed out1
out of adjust1
undertorqued1

Engines most often reporting it

Lycoming IO-390-A1A6 1

Approved replacement parts 22 parts manufacturer approvals

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

Crane Resistoflex 8Seginus INC 3Emtam, LLC 3Sterling Helicopter 2Intelsat Inflight LLC 2Snaky Creek Enterprises DBA Spectrum Aeromed 1Rotair Industries INC 1Ram Aerospace 1Jet Avion Corporation A Heico Aerospace Company 1

For these models most: Messerschmitt-Bolkow-Blohm BK 117 (2), Airbus BD-500 (2), Sikorsky S-61 (1), Agusta Spa A109 (1).

MakerPartReplacesFitsGrantedStatus
Ram AerospaceJam Nut, MS3186C107P 727-43727-43Pratt & Whitney Canada Corp. PW305A, PW305B, PW306A2026-08-04current
Jet Avion Corporation A Heico Aerospace CompanyJam Nut 5007538JA5007538International Aero... V2522-A5, V2524-A5, V2527-A52023-12-01current
Sterling HelicopterJam Nut Connector Doubler RMMD-000176-02Modification PartAirbus Helicopters... BK117 B-2, BK117 C22022-09-13current
Sterling HelicopterJam Nut Connector Doubler RMMD-000176-01Modification PartAirbus Helicopters... BK117 B-2, BK117 C22022-09-13current
Intelsat Inflight LLCJam Nut Mount Hermetic BHD Feed Thru 233-103-H7Z117-35SN-02233-103-H7Z117-35SN-02Airbus BD-500-1A10 C Series, (A220-100/CS100)2019-04-09current
Intelsat Inflight LLCJam Nut Mount Hermetic BHD Feed Thru 233-103-H7Z117-35SC-02233-103-H7Z117-35SC-02Airbus BD-500-1A10 C Series, (A220-100/CS100)2019-04-09current
Emtam, LLCJam Nut M62290-6EMTM62290-6Pratt & Whitney PW4052, PW4056, PW40602015-09-01current
Emtam, LLCJam Nut M62290-4EMTM62290-4Pratt & Whitney PW4052, PW4056, PW40602015-09-01current
Emtam, LLCJam Nut M62290-10EMTM62290-10Pratt & Whitney PW4052, PW4056, PW40602015-09-01current
Seginus INCJam Nut M62290-4EHAero Controlex P/N M62290-4, Pratt & Whitney...Pratt & Whitney PW4052, PW4056, PW40602014-10-26current
Seginus INCJam Nut M62290-6EHAero Controlex P/N M62290-4, Pratt & Whitney...Pratt & Whitney PW4052, PW4056, PW40602014-10-26current
Seginus INCJam Nut M62290-10EHAero Controlex P/N M62290-4, Pratt & Whitney...Pratt & Whitney PW4052, PW4056, PW40602014-10-26current
Snaky Creek Enterprises DBA Spectrum AeromedJam Nut 04A02160049Modification PartsAGUSTA S.p.A. AW109SP, A109S2014-08-17current
Crane ResistoflexJam Nut R44118P-05OEMLockheed L-1011-3851995-10-18current
Crane ResistoflexJam Nut R44118P-16OEMLockheed L-1011-3851995-10-18current
Crane ResistoflexJam Nut R44118P-08OEMLockheed L-1011-3851995-10-18current
Crane ResistoflexJam Nut R44118P-20OEMLockheed L-1011-3851995-10-18current
Crane ResistoflexJam Nut R44118P-10OEMLockheed L-1011-3851995-10-18current
Crane ResistoflexJam Nut R44118P-04OEMLockheed L-1011-3851995-10-18current
Crane ResistoflexJam Nut R44118P-06OEMLockheed L-1011-3851995-10-18current
Crane ResistoflexJam Nut R44118P-12OEMLockheed L-1011-3851995-10-18current
Rotair Industries INCJam Nut R6130-62056-1S6130-62056-1Sikorsky S-61A (TC H2EA) S-61L/N/NM/R (TC 1H15)1995-05-14current

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.