Dual Altimeter
No failure report names the dual altimeter. 2 FAA approvals let 2 companies make a replacement dual altimeter, Learjet 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 dual altimeter and sell it as an approved part for the models named. These are the companies holding such approvals for a dual altimeter:
For these models most: Learjet 35 (1), Boeing 727 (1).
| Maker | Part | Replaces | Fits | Granted | Status |
|---|---|---|---|---|---|
| Learjet INC | (IS&S) Dual Altimeter System M100319ICT | Modification Part | Learjet 35/35A, 36/36A, C-21A | 2006-11-13 | current |
| Kollsman INC | Dual altimeter and Differential Pressure Indicator A39439 10 001 | - | Boeing 727-(all) | 1974-07-14 | 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.