Preamplifier
No failure report names the preamplifier. 3 FAA approvals let 2 companies make a replacement preamplifier, Bae Systems Controls INC holding the most (2).
Approved replacement parts 3 parts manufacturer approvals
A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a preamplifier and sell it as an approved part for the models named. These are the companies holding such approvals for a preamplifier:
For these models most: Boeing 747 (2), Boeing 737 (2), Gulfstream GV-SP G550 (1), Boeing 727 (1).
| Maker | Part | Replaces | Fits | Granted | Status |
|---|---|---|---|---|---|
| L3 Communications Integrated Systems LP | Preamplifier, 1 – 40 GHZ EAP158-0000-1 | Modification Article | Gulfstream Aerospace Corp. GV-SP | 2026-08-25 | current |
| Bae Systems Controls INC | PREAMPLIFIER ASSY 69B47534-1 | 69B47534-1 | The Boeing Company 737-200 SERIES, 747SP SERIES, 747-100 SERIES | 2009-08-20 | current |
| Bae Systems Controls INC | PREAMPLIFIER assembly 69B47534-1 | 69B47534-1 | Boeing 727-200 SERIES, 737-200 SERIES, 747SP SERIES | 2005-04-05 | 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.