The U.S. aircraft register, updated daily
Parts

Pt Line

0 failure reports named the pt line in the last ten years, 28 since 1995. The reports call it "pt7 line", "pt2 line", "pt 7 line", "pt 2 line", "pt-7 line".

Reports by year

03681131995101141998
Reports by year, as a table
reports
19953
199610
199711
19984

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.