The U.S. aircraft register, updated daily
Parts

Shell Reading

No failure report names the shell reading. 2 FAA approvals let 2 companies make a replacement shell reading, Gemini Engineering INC holding the most (1).

Approved replacement parts 2 parts manufacturer approvals

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

For these models most: Boeing 747 (2).

MakerPartReplacesFitsGrantedStatus
Gemini EngineeringSHELL READING LIGH 417U3026-2081417U3026-2081Boeing 747-400 Series, 747-400D Series2009-11-15current
Gemini Engineering INCSHELL READING LIGH 417U3026-2081417U3026-2081Boeing 747-400 Series, 747-400D Series2009-11-15current

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.