Data Unit

8 failure reports named the data unit in the last ten years, 19 since 1999, most often on the Boeing 737; the condition most often found was "failed". 1 FAA approvals let 1 company make a replacement data unit, Rotor Dynamics Amer INC holding the most (1).

Reports by year

Reports by year, as a table

	reports
1999	1
2012	1
2013	6
2014	1
2015	2
2018	1
2019	1
2021	2
2023	1
2024	1
2025	2

Which system the reports file it under last ten years

Instruments and avionics5Engine2Heating, ice protection and utility systems1

Reports by system, as a table

	reports
Instruments and avionics	5
Engine	2
Heating, ice protection and utility systems	1

Models most often reporting it last ten years

Boeing 7374Airbus A3001Airbus A3211Boeing 787 Dreamliner1Embraer EMB-145 ERJ 1451

Models most reported, as a table

	reports
Boeing 737	4
Airbus A300	1
Airbus A321	1
Boeing 787 Dreamliner	1
Embraer EMB-145 ERJ 145	1

How it failed the condition found, last ten years

failed5malfunctioned2faulty1

Conditions found, as a table

	reports
failed	5
malfunctioned	2
faulty	1

Approved replacement parts 1 parts manufacturer approvals

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

Rotor Dynamics Amer INC 1

For these models most: Bell 222 (1).

Maker	Part	Replaces	Fits	Granted	Status
Rotor Dynamics Amer INC	Data Unit Assembly 775-3302-03	Modification Part	Bell 222, 222B, 222U	1993-10-20	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.