Relay Undervoltage
No failure report names the relay undervoltage. 3 FAA approvals let 1 company make a replacement relay undervoltage, Hartman Electrical Mfg holding the most (3).
Approved replacement parts 3 parts manufacturer approvals
A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a relay undervoltage and sell it as an approved part for the models named. These are the companies holding such approvals for a relay undervoltage:
For these models most: Aerospatiale ATR 72 (2), Aerospatiale/Aeritalia ATR 42 (2), Boeing 747 (1).
| Maker | Part | Replaces | Fits | Granted | Status |
|---|---|---|---|---|---|
| Hartman Electrical Mfg | Relay Undervoltage ac 3 Phase - Lowest of 3 E-316C | Boeing E-316C | Boeing 747-100, -200, -300 | 1994-03-21 | current |
| Hartman Electrical Mfg | Relay Undervoltage w/ Time Delay E-311PB | Hartman Elect. E-311PB | Aerospatiale ATR42, ATR72 | 1993-10-20 | current |
| Hartman Electrical Mfg | Relay Undervoltage w/ Time Delay E-311PA | Aeritalia 24-31-14 | Aerospatiale ATR42, ATR72 | 1993-10-20 | 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.