Parts · Airframe structure

Ventral Fin

1 failure reports named the ventral fin in the last ten years, 3 since 1996, most often on the Boeing 737; the condition most often found was "exposed". 2 FAA approvals let 2 companies make a replacement ventral fin, Test Instrumentation INC holding the most (1).

Reports by year

Reports by year, as a table

	reports
1996	1
2011	1
2023	1

Which system the reports file it under last ten years

Airframe structure1

Reports by system, as a table

	reports
Airframe structure	1

Models most often reporting it last ten years

Boeing 7371

Models most reported, as a table

	reports
Boeing 737	1

How it failed the condition found, last ten years

exposed1

Conditions found, as a table

	reports
exposed	1

Approved replacement parts 2 parts manufacturer approvals

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

Test Instrumentation INC 1Fliegen Works INC 1

For these models most: Mitsubishi MU-2 (1), Cessna 172 Skyhawk (1), Cessna 170 (1).

Maker	Part	Replaces	Fits	Granted	Status
Test Instrumentation INC	Ventral Fin Assy, Aft Fuselage TII-34120-1	030A-34120-1030A-34120-2	Mitsubishi Heavy Industries MU-2B-30, MU-2B-35, MU-2B-36	2024-02-08	current
Fliegen Works INC	Ventral Fin Assembly (no holes) 35A-59035-10	35A-59035-10	Cessna 170A, 170B, 172	2016-09-27	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.