Parts · Airframe structure

Cap Seal

18 failure reports named the cap seal in the last ten years, 22 since 1999, most often on the Boeing 737; the condition most often found was "corroded". 17 FAA approvals let 7 companies make a replacement cap seal, Safran Cabin INC. holding the most (8).

Reports by year

Reports by year, as a table

	reports
1999	2
2001	2
2017	9
2018	7
2022	1
2025	1

Which system the reports file it under last ten years

Airframe structure15Engine2Landing gear1

Reports by system, as a table

	reports
Airframe structure	15
Engine	2
Landing gear	1

Models most often reporting it last ten years

Boeing 73714Airbus A3201Boeing 7671

Models most reported, as a table

	reports
Boeing 737	14
Airbus A320	1
Boeing 767	1

How it failed the condition found, last ten years

corroded13cracked1damaged1elongated1fractured1leaking1

Conditions found, as a table

	reports
corroded	13
cracked	1
damaged	1
elongated	1
fractured	1
leaking	1

Engines most often reporting it

International Aero Engines V2527-A5 1

Approved replacement parts 17 parts manufacturer approvals

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

Safran Cabin INC. 8Kirkhill-Ta CO 2Hawker Pacific INC 2Hawker Pacific Aerospace 2Seal Dynamics INC 1Quest Aviation Supply INC 1Machen INC 1

For these models most: Bombardier CL-600 Challenger and CRJ (8), Boeing 747 (2), Bell 212 (2), Bell 205 (2), Piper PA-60 Aerostar (1).

Maker	Part	Replaces	Fits	Granted	Status
Safran Cabin INC.	CAP SEAL 4582091-3	4582091-3	MHI RJ Aviation ULC CL-600-2B19 MHI RJ Aviation ULC 100 Series	2025-08-22	current
Safran Cabin INC.	CAP- SEAL 4582091BJ3	4582091BJ3	MHI RJ AVIATION ULC CL-600-2B19 (REGIONAL JET...	2025-08-18	current
Safran Cabin INC.	CAP- SEAL 4582091N3	4582091N3	MHI RJ AVIATION ULC CL-600-2B19 (REGIONAL JET...	2025-08-18	current
Safran Cabin INC.	CAP- SEAL 4582091BD3	4582091BD3	MHI RJ AVIATION ULC CL-600-2B19 (REGIONAL JET...	2025-08-18	current
Safran Cabin INC.	CAP- SEAL 4582091AU3	4582091AU3	MHI RJ AVIATION ULC CL-600-2B19 (REGIONAL JET...	2025-08-18	current
Safran Cabin INC.	CAP- SEAL 4582091AE3	4582091AE3	MHI RJ AVIATION ULC CL-600-2B19 (REGIONAL JET...	2025-08-18	current
Safran Cabin INC.	CAP- SEAL 4582091AY3	4582091AY3	MHI RJ AVIATION ULC CL-600-2B19 (REGIONAL JET...	2025-08-18	current
Safran Cabin INC.	CAP- SEAL 4582091AD3	4582091AD3	MHI RJ AVIATION ULC CL-600-2B19 (REGIONAL JET...	2025-08-18	current
Kirkhill-Ta CO	CAP SEAL 5673-112	10-60754-112	Boeing 747-100 SERIES, 747-200BSERIES,...	2015-08-28	current
Kirkhill-Ta CO	CAP SEAL S-13117-112	10-60754-112	Boeing 747-100 SERIES, 747-200BSERIES,...	2015-08-28	current
Seal Dynamics INC	Cap Seal, Tee Hinge Pin, Transcowl D52B1401QAS-11	Middle River Aircraft Systems P/N D52B1401-11	General Electric CF6-80C2A1, CF6-80C2A2, CF6-80C2A3	2014-10-09	current
Quest Aviation Supply INC	Cap Seal, Tee Hinge Pin, Transcowl D52B1401QAS-11	D52B1401-11	General Electric CF6-80C2A1, -80C2A2, -80C2A3	2010-10-17	current
Machen INC	Cap Seal 66-40012-1, -3, -5 & -7	Modification Parts	Aerostar Aircraft PA-60-600, -601, -601P & -602P	1999-02-18	current
Hawker Pacific Aerospace	Cap Seal 2722371HPI-1	Parker Hannifin 2722371-1	Bell 205A, 205A-1	1998-08-12	current
Hawker Pacific Aerospace	Cap Seal 2722371HPI-2	Parker Hannifin 2722371-2	Bell 212	1998-08-12	current
Hawker Pacific INC	Cap Seal 2722371HPI-1	Parker Hannifin 2722371-1	Bell 205A, 205A-1	1992-07-12	current
Hawker Pacific INC	Cap Seal 2722371HPI-2	Parker Hannifin 2722371-2	Bell 212	1992-07-12	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.