Light Sys

79 failure reports named the light sys in the last ten years, 79 since 2024, most often on the Boeing 737; the condition most often found was "malfunctioned". The reports call it "light sys", "e light sys".

Reports by year

Reports by year, as a table

	reports
2024	8
2025	23
2026	48

Which system the reports file it under last ten years

Electrical power79

Reports by system, as a table

	reports
Electrical power	79

Models most often reporting it last ten years

Models most reported, as a table

	reports
Boeing 737	27
Airbus A330	8
Airbus A319	5
Embraer ERJ 170 E170 and E175	5
Airbus BD-500	4
Boeing 767	4
Boeing 787 Dreamliner	4
Cessna 680 Citation Sovereign and Latitude	4
Airbus A320	3
Boeing 717	2
Boeing 757	2
Boeing 777	2

How it failed the condition found, last ten years

malfunctioned28faulted19inoperative12no discrepancy8intermittent4unknown2abnormal1cracked1dim1failed1

Conditions found, as a table

	reports
malfunctioned	28
faulted	19
inoperative	12
no discrepancy	8
intermittent	4
unknown	2
abnormal	1
cracked	1
dim	1
failed	1

Engines most often reporting it

CFM International CFM56-7B27 2

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.