Parts · Airframe structure

Spar Cap

492 failure reports named the spar cap in the last ten years, 1,664 since 1995, most often on the Mcdonnell Douglas MD-11; the condition most often found was "corroded". 1 FAA approvals let 1 company make a replacement spar cap, Yesteryear Aviation INC holding the most (1). The reports call it "spar cap", "rear spar cap", "spar cap assy", "spar cap fitting".

Reports by year

Reports by year, as a table

	reports
1995	54
1996	75
1997	77
1998	65
1999	17
2000	48
2001	59
2002	48
2003	62
2004	43
2005	35
2006	96
2007	84
2008	32
2009	44
2010	50
2011	55
2012	76
2013	51
2014	46
2015	55
2016	62
2017	70
2018	61
2019	63
2020	50
2021	50
2022	23
2023	19
2024	29
2025	39
2026	26

Which system the reports file it under last ten years

Airframe structure492

Reports by system, as a table

	reports
Airframe structure	492

Models most often reporting it last ten years

Mcdonnell Douglas MD-11207Boeing 71764Cessna 680 Citation Sovereign and Latitude59Mcdonnell Douglas Aircraft Co MD-8831Cessna 40229Lockheed 38212Mcdonnell Douglas MD-1012Boeing 73710Cessna 560 Citation V, Ultra, Encore and Excel10Embraer EMB-145 ERJ 1456Cessna 750 Citation X5Mcdonnell Douglas Aircraft Co MD 835

Models most reported, as a table

	reports
Mcdonnell Douglas MD-11	207
Boeing 717	64
Cessna 680 Citation Sovereign and Latitude	59
Mcdonnell Douglas Aircraft Co MD-88	31
Cessna 402	29
Lockheed 382	12
Mcdonnell Douglas MD-10	12
Boeing 737	10
Cessna 560 Citation V, Ultra, Encore and Excel	10
Embraer EMB-145 ERJ 145	6
Cessna 750 Citation X	5
Mcdonnell Douglas Aircraft Co MD 83	5

How it failed the condition found, last ten years

corroded306cracked143damaged29not reported3none2worn2delaminated1distressed1failed1gouged1

Conditions found, as a table

	reports
corroded	306
cracked	143
damaged	29
not reported	3
none	2
worn	2
delaminated	1
distressed	1
failed	1
gouged	1

Engines most often reporting it

Pratt & Whitney Canada PW123 2Pratt & Whitney Canada PT6B-37A 1Pratt & Whitney PT6A series 1

Approved replacement parts 1 parts manufacturer approvals

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

Yesteryear Aviation INC 1

Maker	Part	Replaces	Fits	Granted	Status
Yesteryear Aviation INC	Lower Spar Cap Wing Center Section YA66-13198	66-13198	Rockwell... BC-1A, AT-6, (SNJ-2) (also known as...	2010-03-23	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.