Column Distribution
No failure report names the column distribution. 2 FAA approvals let 2 companies make a replacement column distribution, Northwest Aerospace Technologies 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 column distribution and sell it as an approved part for the models named. These are the companies holding such approvals for a column distribution:
For these models most: Boeing 777 (1), Airbus A330 (1).
| Maker | Part | Replaces | Fits | Granted | Status |
|---|---|---|---|---|---|
| Northwest Aerospace Technologies | Column Distribution Unit 1137-1 | Modification Part | Boeing 777-200 Series | 2001-12-19 | current |
| General Dynamics Electronic Systems | Column Distribution Unit 1137-1 | Modification Part | Airbus A330-343 | 2001-10-01 | 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.