The U.S. aircraft register, updated daily
Parts

Mfdau

No failure report names the mfdau. 13 FAA approvals let 4 companies make a replacement mfdau, Teledyne Controls LLC holding the most (5).

Approved replacement parts 13 parts manufacturer approvals

A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a mfdau and sell it as an approved part for the models named. These are the companies holding such approvals for a mfdau:

For these models most: Embraer EMB-120 (2), Boeing 727 (2), Airbus Helicopters MBB-BK 117 C-2 (2), Airbus Helicopters EC 155 (2), Airbus Helicopters EC-135 now H135 (2), Raytheon Corporate Jets Inc HAWKER 800 (1), Raytheon Corporate Jets Inc BAE 125 (1).

MakerPartReplacesFitsGrantedStatus
Teledyne Controls LLCMFDAU 2231230-62231230-6Boeing 727-100, -2002016-01-03current
Teledyne Controls LLCMFDAU 2231230-5A2231230-5AIsrael Aircraft Industries IAI) (Astra SPX2016-01-03current
Teledyne Controls LLCMFDAU 2231230-5A2231230-5ARaytheon Aircraft Company BAE 125 800A, 1000A, Hawker 8002016-01-03current
Teledyne Controls LLCMFDAU 2231266-4-A2231266-4-AEmbraer EMB-1202016-01-03current
Teledyne Controls LLCMFDAU 2243500-362243500-36Lear Jet L-60, CL-6012016-01-03current
North Flight Data System, LLCMFDAU N009-1010Modification PartEurocopter France EC 155B, EC155B12012-12-12current
North Flight Data System, LLCMFDAU N009-1010Modification PartEurocopter Deutschland GMBH EC135 P1, P2, P2+2012-12-12current
North Flight Data System, LLCMFDAU N009-1010Modification PartEurocopter Deutschland GMBH MBB-BK 117 C-22012-12-12current
North Flight Data Systems LLCMFDAU N009-1010Modification PartEurocopter France EC155B, EC155B12012-06-07current
North Flight Data Systems LLCMFDAU N009-1010Modification PartEurocopter Deutschland GmbH MBB-BK 117 C-22012-06-07current
North Flight Data Systems LLCMFDAU N009-1010Modification PartEurocopter Deutschland GmbH EC135 P1, P2, P2+2011-12-11current
Teledyne ControlsMFDAU 2231230-6Teledyne Control 2231230-6Boeing 727-100, -2001998-12-15current
Teledyne ControlsMFDAU 2231266-4-ATeledyne Control 2231266-4-AEmbraer Empresa EMB-1201998-12-13current

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.