Loop

31 failure reports named the loop in the last ten years, 151 since 1995, most often on the Bombardier CL-600 Challenger and CRJ; the condition most often found was "inoperative". 10 FAA approvals let 4 companies make a replacement loop, Amsafe Bridport holding the most (6). The reports call it "loop", "'a' loop", "b-loop", "loop b assy".

Reports by year

Reports by year, as a table

	reports
1995	4
1996	1
1997	1
1998	6
2000	7
2001	7
2002	5
2003	2
2004	4
2005	3
2006	4
2007	8
2008	4
2009	9
2010	8
2011	12
2012	9
2013	14
2014	7
2015	5
2016	4
2017	2
2018	5
2019	2
2020	1
2022	10
2023	1
2024	1
2025	2
2026	3

Which system the reports file it under last ten years

Emergency equipment16Heating, ice protection and utility systems13Cabin, seats and restraints2

Reports by system, as a table

	reports
Emergency equipment	16
Heating, ice protection and utility systems	13
Cabin, seats and restraints	2

Models most often reporting it last ten years

Bombardier CL-600 Challenger and CRJ11Boeing 7378Boeing 7674Mcdonnell Douglas MD-102Airbus A3211Boeing 7471Boeing 7771Embraer ERJ 170 E170 and E1751Embraer ERJ 190 E190 and E1951Learjet 601

Models most reported, as a table

	reports
Bombardier CL-600 Challenger and CRJ	11
Boeing 737	8
Boeing 767	4
Mcdonnell Douglas MD-10	2
Airbus A321	1
Boeing 747	1
Boeing 777	1
Embraer ERJ 170 E170 and E175	1
Embraer ERJ 190 E190 and E195	1
Learjet 60	1

How it failed the condition found, last ten years

inoperative5out of position4failed3faulty3warning message3contaminated1damaged1defective1detached1dirty1

Conditions found, as a table

	reports
inoperative	5
out of position	4
failed	3
faulty	3
warning message	3
contaminated	1
damaged	1
defective	1
detached	1
dirty	1

Engines most often reporting it

General Electric CFM56 series 1

Approved replacement parts 10 parts manufacturer approvals

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

Amsafe Bridport 6 Northwest Aerospace Technologies 2 Volant 1 Aar Component Services - Hot Springs, LLC 1

For these models most: Boeing 767 (4), Boeing 747 (3), Boeing 757 (2), Boeing 737 (1).

Maker	Part	Replaces	Fits	Granted	Status
Aar Component Services - Hot Springs, LLC	Loop A-411U1234-10	411U1234-10	The Boeing Company 747-200 Series	2025-05-21	current
Amsafe Bridport	LOOP 65B52480-23	65B52480-23	BOEING 747-100 SERIES, 747-200B SERIES,...	2022-09-27	current
Amsafe Bridport	LOOP 416T2027-34	416T2027-34	BOEING 767-200 SERIES, 767-300 SERIES	2022-09-27	current
Amsafe Bridport	LOOP 416T2027-15	416T2027-15	BOEING 767-200 SERIES, 767-300 SERIES	2022-09-27	current
Amsafe Bridport	LOOP 416T2027-15	(416T2027-15)	BOEING 767-200 SERIES, 767-300 SERIES	2011-02-03	current
Amsafe Bridport	LOOP 65B52480-23	(65B52480-23)	BOEING 747-100 SERIES, 747-200B SERIES,...	2011-02-03	current
Amsafe Bridport	LOOP 416T2027-34	(416T2027-34)	BOEING 767-200 SERIES, 767-300 SERIES	2011-02-03	current
Volant	Loop Assembly 413A3610-200HT	413A3610-200HT	Boeing 737-700 Series	2009-09-03	current
Northwest Aerospace Technologies	Loop G80494002-109	Modification Part	Boeing 757-200 S/Ns 29025, 29026, 29027	2004-11-07	current
Northwest Aerospace Technologies	Loop G80494003-101	Modification Part	Boeing 757-200 S/Ns 29025, 29026, 29027	2004-11-07	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.