The U.S. aircraft register, updated daily
Parts

Externally Mounted

No failure report names the externally mounted. 1 FAA approvals let 1 company make a replacement externally mounted, Air Cruisers holding the most (1).

Approved replacement parts 1 parts manufacturer approvals

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

MakerPartReplacesFitsGrantedStatus
Air CruisersExternally Mounted Liferaft with Pneumatic Activation 68160-101 68160-103Modification PartBell Helicopter... Bell 4072014-05-08current

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.