Parts · Heating, ice protection and utility systems

Defog System

11 failure reports named the defog system in the last ten years, 17 since 2007, most often on the Cessna 550 Citation II; the condition most often found was "shorted".

Reports by year

Reports by year, as a table

	reports
2007	1
2008	2
2010	2
2011	1
2018	1
2021	1
2025	1
2026	8

Which system the reports file it under last ten years

Heating, ice protection and utility systems11

Reports by system, as a table

	reports
Heating, ice protection and utility systems	11

Models most often reporting it last ten years

Cessna 550 Citation II8Agusta Aerospace Corp AW1391Bell 206 JetRanger and LongRanger1Boeing 7171

Models most reported, as a table

	reports
Cessna 550 Citation II	8
Agusta Aerospace Corp AW139	1
Bell 206 JetRanger and LongRanger	1
Boeing 717	1

How it failed the condition found, last ten years

shorted8malfunctioned2faulted1

Conditions found, as a table

	reports
shorted	8
malfunctioned	2
faulted	1

Engines most often reporting it

Pratt & Whitney Canada PT6C-67C 1

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.