Parts · Airframe structure

Tee Fitting

541 failure reports named the tee fitting in the last ten years, 1,196 since 1995, most often on the Boeing 757; the condition most often found was "corroded". 17 FAA approvals let 8 companies make a replacement tee fitting, Gulfstream Aerospace LP holding the most (4).

Reports by year

Reports by year, as a table

	reports
1995	2
1996	9
1997	5
1998	2
2000	1
2001	4
2002	14
2003	25
2004	24
2005	22
2006	30
2007	33
2008	33
2009	71
2010	37
2011	68
2012	92
2013	65
2014	56
2015	62
2016	79
2017	72
2018	78
2019	64
2020	65
2021	49
2022	10
2023	19
2024	39
2025	25
2026	41

Which system the reports file it under last ten years

Airframe structure522Heating, ice protection and utility systems7Emergency equipment4Fuel system3Landing gear3Engine2

Reports by system, as a table

	reports
Airframe structure	522
Heating, ice protection and utility systems	7
Emergency equipment	4
Fuel system	3
Landing gear	3
Engine	2

Models most often reporting it last ten years

Boeing 75796Boeing 76783Mcdonnell Douglas MD-1183Boeing 73775Mcdonnell Douglas MD-1058Lockheed 38233Bombardier CL-600 Challenger and CRJ24Embraer EMB-145 ERJ 14512Mcdonnell Douglas Aircraft Co MD-8812Boeing 71711Boeing 7478Airbus A3205

Models most reported, as a table

	reports
Boeing 757	96
Boeing 767	83
Mcdonnell Douglas MD-11	83
Boeing 737	75
Mcdonnell Douglas MD-10	58
Lockheed 382	33
Bombardier CL-600 Challenger and CRJ	24
Embraer EMB-145 ERJ 145	12
Mcdonnell Douglas Aircraft Co MD-88	12
Boeing 717	11
Boeing 747	8
Airbus A320	5

How it failed the condition found, last ten years

corroded265cracked217damaged24leaking8worn6gouged5bent3blocked1broken1chafed1

Conditions found, as a table

	reports
corroded	265
cracked	217
damaged	24
leaking	8
worn	6
gouged	5
bent	3
blocked	1
broken	1
chafed	1

Engines most often reporting it

General Electric CF6-80C2B1F 1Rolls-Royce RB211-535E437 1Turbomeca (Safran) ARRIEL 1E2 1

Approved replacement parts 17 parts manufacturer approvals

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

Gulfstream Aerospace LP 4Galaxy Aerospace CO LP 4Triumph Composite Systems INC 2Spirit Aerosystems INC 2Designed Metal Connections, INC. DBA Permaswage 2Monogram Systems 1Gulfstream Aerospace Corporation 1Designed Metal Connections INC 1

For these models most: Israel Aircraft Industries 1125 (7), Israel Aircraft Industries ASTRA SPX (6), Israel Aircraft Industries GALAXY (5), Boeing 777 (2), Boeing 757 (2), Embraer ERJ 190 E190 and E195 (1).

Maker	Part	Replaces	Fits	Granted	Status
Monogram Systems	Tee-Fitting 19600-996-009	19600-996-009	Embraer ERJ 190-300	2018-05-15	current
Designed Metal Connections, INC. DBA Permaswage	Tee Fitting D10023-060406	D10023-060406	Israel Aircraft Industries 1125 Westwind ASTRA, ASTRA SPX	2011-10-13	current
Designed Metal Connections, INC. DBA Permaswage	Tee Fitting D10023-060604	D10023-060604	IAI Galaxy	2011-10-13	current
Gulfstream Aerospace Corporation	Tee Fitting Assy. Extension, Transfer 25W653130-501	25W653130-501	Gulfstream 1125 Westwind Astra, Astra SPX, 100	2008-06-09	current
Spirit Aerosystems INC	TEE FITTING 141W8544-23	141W8544-23	Boeing 777-200 SERIES, 777-300 SERIES	2007-03-05	current
Spirit Aerosystems INC	TEE FITTING 141W8544-23	141W8544-23	Boeing 777-200 SERIES, 777-300 SERIES	2006-02-28	current
Triumph Composite Systems INC	TEE FITTING, END 65C25629-80	65C25629-80	Boeing 757-200PF SERIES	2005-11-25	current
Designed Metal Connections INC	Tee Fitting D10023-060406	D10023-060406	Israel 1125 Westwind ASTRA ASTRA SPX	2005-01-27	current
Triumph Composite Systems INC	Tee Fitting 65C25629-80	65C25629-80	Boeing 757-200PF Series	2003-08-14	current
Gulfstream Aerospace LP	Tee Fitting Assembly 25W783019-521	IAI 25W783019-521	Israel 1125 Westwind Astra, Astra SPX	2001-06-06	current
Gulfstream Aerospace LP	Tee Fitting Assembly 25W783019-519	IAI 25W783019-519	Israel 1125 Westwind Astra, Astra SPX	2001-06-06	current
Gulfstream Aerospace LP	Tee Fitting 4AS7810104-519	IAI 4AS7810104-519	Gulfstream Galaxy	2001-06-06	current
Gulfstream Aerospace LP	Tee Fitting 4AS7810104-521	IAI 4AS7810104-521	Gulfstream Galaxy	2001-06-06	current
Galaxy Aerospace CO LP	Tee Fitting Assembly 25W783019-519	IAI 25W783019-519	Israel 1125 Westwind Astra, Astra SPX	2001-05-08	current
Galaxy Aerospace CO LP	Tee Fitting Assembly 25W783019-521	IAI 25W783019-521	Israel 1125 Westwind Astra, Astra SPX	2001-05-08	current
Galaxy Aerospace CO LP	Tee Fitting 4AS7810104-519	IAI 4AS7810104-519	Gulfstream Galaxy	2001-05-08	current
Galaxy Aerospace CO LP	Tee Fitting 4AS7810104-521	IAI 4AS7810104-521	Gulfstream Galaxy	2001-05-08	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.