Parts · Electrical power

Coupling Sleeve

2 failure reports named the coupling sleeve in the last ten years, 4 since 2004, most often on the Boeing 737; the condition most often found was "damaged". 18 FAA approvals let 8 companies make a replacement coupling sleeve, Seal Dynamics INC holding the most (4).

Reports by year

Reports by year, as a table

	reports
2004	1
2008	1
2019	1
2022	1

Which system the reports file it under last ten years

Electrical power1Heating, ice protection and utility systems1

Reports by system, as a table

	reports
Electrical power	1
Heating, ice protection and utility systems	1

Models most often reporting it last ten years

Boeing 7371Embraer EMB-135 ERJ 135 and Legacy1

Models most reported, as a table

	reports
Boeing 737	1
Embraer EMB-135 ERJ 135 and Legacy	1

How it failed the condition found, last ten years

damaged1unsecure1

Conditions found, as a table

	reports
damaged	1
unsecure	1

Approved replacement parts 18 parts manufacturer approvals

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

Seal Dynamics INC 4Aviation Materials Management INC 4Turbine Kinetics INC, A Heico Aerospace Company 2Spirit Aerosystems INC 2Aviation Materials Management, INC. 2Aviation Materials Management, INC 2Texas Aero Support 1Gemini Engineering 1

For these models most: Boeing 737 (13), Boeing 757 (11), Embraer EMB-145 ERJ 145 (4), Embraer EMB-135 ERJ 135 and Legacy (4).

Maker	Part	Replaces	Fits	Granted	Status
Turbine Kinetics INC, A Heico Aerospace Company	Coupling-Sleeve 256A3745-1KT	256A3745-1	The Boeing Company 737-8200	2025-12-23	current
Turbine Kinetics INC, A Heico Aerospace Company	Coupling-Sleeve 256A3745-1KT	256A3745-1	The Boeing Company 737-700 Series, 737-800 Series,...	2025-10-27	current
Aviation Materials Management, INC	Coupling Sleeve 251N4276-1	251N4276-1	Boeing 737-100 SERIES, 737-200 SERIES,...	2015-02-12	current
Aviation Materials Management, INC	Coupling Sleeve 251N4276-1	251N4276-1	Boeing 737-100 Series, 737-200 Series,...	2015-02-12	current
Aviation Materials Management, INC.	Coupling Sleeve 251N4276-1	251N4276-1	Boeing 737-100 SERIES, 737-200 SERIES,...	2014-09-04	current
Aviation Materials Management, INC.	Coupling Sleeve 251N4276-1	251N4276-1	Boeing 737-100 Series, 737-200 Series,...	2014-09-04	current
Aviation Materials Management INC	Coupling Sleeve 251N4276-1	251N4276-1	Boeing 737-100 SERIES, 737-200 SERIES,...	2013-03-24	current
Aviation Materials Management INC	Coupling Sleeve 251N4276-1	251N4276-1	Boeing 737-100 Series, 737-200 Series,...	2013-03-24	current
Seal Dynamics INC	Coupling Sleeve Kit 2-1/2 inch T30000SD-03	N/A	Embraer EMB-145, EMB-145ER, EMB-145MR	2013-03-10	current
Seal Dynamics INC	Coupling Sleeve Kit T30000SD	N/A	Embraer EMB-145, EMB-145ER, EMB-145MR	2013-03-10	current
Seal Dynamics INC	Coupling Sleeve Kit 2 inch T30000SD-02	N/A	Embraer EMB-145, EMB-145ER, EMB-145MR	2013-03-10	current
Seal Dynamics INC	Coupling Sleeve Kit 1-1/2 inch T30000SD-01	N/A	Embraer EMB-145, EMB-145ER, EMB-145MR	2013-03-10	current
Aviation Materials Management INC	Coupling Sleeve 251N4276-1	251N4276-1	Boeing 737-100 SERIES, 737-200 SERIES,...	2010-10-18	current
Aviation Materials Management INC	Coupling Sleeve 251N4276-1	251N4276-1	Boeing 737-100 Series, 737-200 Series,...	2010-08-08	current
Spirit Aerosystems INC	COUPLING SLEEVE 251N4276-1	251N4276-1	Boeing 757-200 SERIES, 757-200PF SERIES	2009-08-13	current
Spirit Aerosystems INC	COUPLING SLEEVE 251N4276-2	251N4276-2	Boeing 737-300 SERIES, 737-400 SERIES,...	2009-08-13	current
Gemini Engineering	Coupling Sleeve 251N4276-1	251N4276-1	Boeing 737-100 Series, 737-200 Series,...	2007-08-27	current
Texas Aero Support	Coupling Sleeve - Splined 1027008T-1, -2	Boeing 251N4276-1, -2	Boeing 737-300, -400, -500	1993-04-06	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.