Fuel Summation
No failure report names the fuel summation. 5 FAA approvals let 2 companies make a replacement fuel summation, Smiths Industries/Aerospace holding the most (3).
Approved replacement parts 5 parts manufacturer approvals
A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a fuel summation and sell it as an approved part for the models named. These are the companies holding such approvals for a fuel summation:
For these models most: Boeing 737 (4), Boeing 727 (1).
| Maker | Part | Replaces | Fits | Granted | Status |
|---|---|---|---|---|---|
| Smiths Industries/Aerospace | Fuel Summation Unit 4050-04-1 | Modification Part | Boeing 737-300, 737-400, 737-500 | 2001-08-14 | current |
| Smiths Industries/Aerospace | Fuel Summation Unit 4050-01 | Boeing 10-61219-78 | Boeing 737-200, -300, -400 | 1992-07-23 | current |
| Smiths Industries/Aerospace | Fuel Summation Unit 4050-01-1 | Boeing 10-61219-116 | Boeing 737-200, -300, -400 | 1992-07-20 | current |
| Simmonds Precision Products INC Goodrich Sensors and Integrated Systems - Vt | Fuel Summation Unit 473048 | Boeing part number 10-61219-47 | Boeing 737 | 1980-05-14 | current |
| Simmonds Precision Products INC Goodrich Sensors and Integrated Systems - Vt | Fuel Summation Unit 473049 | Boeing part number 10-60520-60 | Boeing 727 | 1980-05-14 | 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.