The U.S. aircraft register, updated daily
Parts

Bubble Chin

No failure report names the bubble chin. 5 FAA approvals let 4 companies make a replacement bubble chin, Nordam-Texas holding the most (2).

Approved replacement parts 5 parts manufacturer approvals

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

For these models most: Hiller UH-12 (5).

MakerPartReplacesFitsGrantedStatus
Nordam Transparency DivReplacement Bubble Assy Chin P-UH-12E-7, -8,-9, -10, -11, -12Hiller Aviation64004-112, -113, -123Hiller Aviation UH-12 E, C, D UH-12E-L1999-10-12current
Nordam-TexasReplacement Bubble Assembly Chin P-UH-12E-7, -8, -9, -10, -11, -12Hiller 64004-112, -113, -123Hiller Aviation UH-12 E, C, D1997-08-20current
Nordam-TexasReplacement Bubble Assembly Chin P-UH-12E-7, -8,-9, -10, -11, -12Hiller 64004-112, -113, -123Hiller Aviation UH-12 E, C, D1997-02-12current
M & N AerospaceReplacement Bubble Assembly Chin P-UHE-12-7, -8, -9, -10, -11, -12Hiller 64004-112, -113, -123Hiller Aviation UH-12C, D, UH-12E1993-09-09current
Ten Cate Aerospace INCReplacement Bubble Assembly Chin P-UHE-12-7, -8, -9, -10, -11, -12Hiller 64004-112, -113, -123Hiller Aviation UH-12E, C, D1993-05-16current

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.