Parts · Rotorcraft systems

Rotor Head

5 failure reports named the rotor head in the last ten years, 54 since 2001, most often on the Messerschmitt-Bolkow-Blohm BK 117; the condition most often found was "out of limits". 1 FAA approvals let 1 company make a replacement rotor head, Arkwin Industires INC holding the most (1). The reports call it "rotor head", "rotor head assy".

Reports by year

Reports by year, as a table

	reports
2001	1
2002	10
2003	23
2004	10
2008	1
2009	2
2010	1
2011	1
2016	2
2025	1
2026	2

Which system the reports file it under last ten years

Rotorcraft systems5

Reports by system, as a table

	reports
Rotorcraft systems	5

Models most often reporting it last ten years

Messerschmitt-Bolkow-Blohm BK 1172Bell 2121Bell 4071Boeing-Vertol 2341

Models most reported, as a table

	reports
Messerschmitt-Bolkow-Blohm BK 117	2
Bell 212	1
Bell 407	1
Boeing-Vertol 234	1

How it failed the condition found, last ten years

out of limits2cracked1misoverhauled1not seated1

Conditions found, as a table

	reports
out of limits	2
cracked	1
misoverhauled	1
not seated	1

Engines most often reporting it

Allison (Rolls-Royce) 250-C47B 1

Approved replacement parts 1 parts manufacturer approvals

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

Arkwin Industires INC 1

For these models most: Sikorsky Aircraft Corp S-92 (1).

Maker	Part	Replaces	Fits	Granted	Status
Arkwin Industires INC	Rotor Head Damper. 1911012-003	Sikorsky P/N 92106-15801-103	Sikorsky Aircraft Corporation S-92A	2010-05-20	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.