Transformer

49 failure reports named the transformer in the last ten years, 232 since 1995, most often on the Messerschmitt-Bolkow-Blohm BK 117; the condition most often found was "failed". 428 FAA approvals let 25 companies make a replacement transformer, Pacific Scientific, Oeco holding the most (177). The reports call it "transformer", "transformer/rec".

Reports by year

Reports by year, as a table

	reports
1995	4
1996	16
1997	11
1998	16
1999	8
2000	23
2001	28
2002	9
2003	9
2004	3
2005	4
2006	4
2007	7
2008	5
2009	8
2010	4
2011	3
2012	7
2013	5
2014	4
2015	5
2016	7
2017	2
2018	1
2019	8
2020	2
2021	5
2022	4
2023	5
2024	13
2025	2

Which system the reports file it under last ten years

Electrical power38Engine3Flight controls3Heating, ice protection and utility systems2Instruments and avionics1Cabin, seats and restraints1Landing gear1

Reports by system, as a table

	reports
Electrical power	38
Engine	3
Flight controls	3
Heating, ice protection and utility systems	2
Instruments and avionics	1
Cabin, seats and restraints	1
Landing gear	1

Models most often reporting it last ten years

Models most reported, as a table

	reports
Messerschmitt-Bolkow-Blohm BK 117	17
Boeing 767	9
Airbus A330	3
Mcdonnell Douglas Aircraft Co MD-88	3
Airbus A300	2
Airbus A320	2
Airbus A321	2
Boeing 737	2
Airbus A319	1
Boeing Of Canada/Dehav Div DHC-8	1
Boeing 717	1
Boeing 747	1

How it failed the condition found, last ten years

failed17fluctuates3malfunctioned3split3burned2defective2erratic2faulted2faulty2inoperative2

Conditions found, as a table

	reports
failed	17
fluctuates	3
malfunctioned	3
split	3
burned	2
defective	2
erratic	2
faulted	2
faulty	2
inoperative	2

Engines most often reporting it

Pratt & Whitney Canada PW123 1

Approved replacement parts 428 parts manufacturer approvals

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

For these models most: Boeing 737 (125), Boeing 727 (93), Boeing 747 (61), Boeing 707 (53), Mcdonnell Douglas DC-9 (47), Douglas DC-8 (37), Mcdonnell Douglas MD-11 (21), Mcdonnell Douglas DC-10 (19), Boeing 757 (17), Boeing 767 (15), Douglas DC-9 (14), Boeing 717 (14).

Maker	Part	Replaces	Fits	Granted	Status
Flight Specialties Components Corporation	Transformer TA135FS	TA135FT1218	The Boeing Company 757-200 Series, 757-200PF Series	2024-10-22	current
Eldec Corporation	Transformer 1-627	1-627	Boeing 747-200 Series, 747-300 Series	2022-07-12	current
Eldec Corporation	Transformer 1-431	1-431	Boeing 737-300 Series	2022-07-12	current
Eldec Corporation	Transformer 1-966	1-966	Boeing 737-100 Series, 737-200 Series,...	2022-07-12	current
Eldec Corporation	Transformer 1-901	1-901	Boeing 737-300 Series	2022-07-12	current
Thales Avionics INC	Transformer Assembly N37201-101	Modification Part	Boeing 737-900ER	2019-02-28	current
Pacific Scientific, Oeco	Transformer, Auto, LV, 25 VA 310-14416-01	310-14416-01	Boeing 737-8, 737-9	2018-10-17	current
Pacific Scientific, Oeco	Transformer, Variable, O/L 16432	16432	Boeing 737-8, 737-9	2018-10-17	current
Aerospace Turbine Rotables	Transformer TR-55-0502-1	Grimes 55-0502-1	Beechcraft G33, F33A, F33C	2017-10-17	current
Rockwell Collins INC	Transformer 159016	159016	Boeing 747-400 Series	2016-06-01	current
Rockwell Collins INC	Transformer 159007	159007	Boeing 737-400 Series, 737-800 Series,...	2016-06-01	current
Soundair Aviation Services	Transformer SP2510-00-5050	550-0377-3	Airbus A300-600, A300, Model B4-622R	2016-05-04	current
Kavlico Corporation	Transformer Assy GM5021-3	10-60810-6	Boeing 727, 737	2016-01-12	current
Kavlico Corporation	Transformer Assy, Linear 2-1032-93	10-60810-34	Boeing 747	2016-01-12	current
Soundair Aviation Services	Transformer SP2510-00-5050	550-0377-3	Airbus A300-600, A300, Model B4-622R	2015-10-15	current
Kavlico Corporation	Transformer Assy GM5021-3	10-60810-6	Boeing 727, 737	2015-09-21	current
Kavlico Corporation	Transformer Assy, Linear 2-1032-93	10-60810-34	Boeing 747	2015-09-21	current
Panasonic Avionics Corporation	TRANSFORMER ASSEMBLY 103418-02	103418-02	Airbus A340-313	2015-04-19	current
Panasonic Avionics Corporation	Transformer 103418-02	103418-02	Boeing 767-300 Series	2015-04-19	current
Panasonic Avionics Corporation	TRANSFORMER RD-AM4902	RD-AM4902	Fokker F.28 MARK 0070	2015-04-19	current
Honeywell International US LLC	TRANSFORMER 58-0084-1	58-0084-1	BOEING 747-200B SERIES, 747-400 SERIES,...	2013-03-24	current
Bae Systems Controls INC	Transformer Assy 69B48274-1	(69B48274-1)	The Boeing Company 747-200B Series 747-200C Series...	2012-05-15	current
Kavlico Corporation	Transformer Assy GM5021-3	10-60810-6	Boeing 727, 737	2011-08-30	current
Kavlico Corporation	Transformer Assy 2-1032-93	10-60810-34	Boeing 747	2011-08-30	current
Panasonic Avionics Corporation	TRANSFORMER RD-AM4902	RD-AM4902	Fokker F.28 MARK 0070	2011-05-19	current
Pacific Scientific, Oeco	Transformer 10796	10796	Fokker F27, F28MK1000, F28MK2000	2011-04-19	current
Pacific Scientific, Oeco	Transformer 6430A	10-60030-1	The Boeing Company 737, 747	2011-04-19	current
Pacific Scientific, Oeco	Transformer 6307	10-3310	The Boeing Company 727-100, 727-200	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-13642-01	7930621	The Boeing Company DC-9-11, DC-9-12, DC-9-13	2011-04-19	current
Pacific Scientific, Oeco	Transformer 12406	12406	The Boeing Company MD-11, MD-11F	2011-04-19	current
Pacific Scientific, Oeco	Transformer 5970	5970	The Boeing Company 707-300, 720, 727-200	2011-04-19	current
Pacific Scientific, Oeco	Transformer 13041	2758478	The Boeing Company DC-8-11, DC-8-12, DC-8-21	2011-04-19	current
Pacific Scientific, Oeco	Transformer 10380A	10380A	The Boeing Company 727-200	2011-04-19	current
Pacific Scientific, Oeco	Transformer 26447	AWN7000	The Boeing Company DC-10-10, DC-10-10F, DC-10-15	2011-04-19	current
Pacific Scientific, Oeco	Transformer 200-26557-01	200-26557-01	The Boeing Company 747-200, 747-300, 747-SP	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-13599-01	10-60828-12	The Boeing Company 727, 737	2011-04-19	current
Pacific Scientific, Oeco	Transformer 9445	10-60828-2	The Boeing Company 737-100, -200, -300	2011-04-19	current
Pacific Scientific, Oeco	Transformer 26447	26447	Lockheed Martin Corporation L-1011-385-1	2011-04-19	current
Pacific Scientific, Oeco	Transformer 314-14544-01	314-14544-01	The Boeing Company 737-200, 767-200, 767-300	2011-04-19	current
Pacific Scientific, Oeco	Transformer 10678	5917240	The Boeing Company DC-9-11, DC-9-12, DC-9-13	2011-04-19	current
Pacific Scientific, Oeco	Transformer 6292	AAN7029	The Boeing Company DC-8-11, DC-8-12, DC-8-21	2011-04-19	current
Pacific Scientific, Oeco	Transformer 12298	12298	The Boeing Company 747	2011-04-19	current
Pacific Scientific, Oeco	Transformer 12433	12433	The Boeing Company 707-300, 737-200	2011-04-19	current
Pacific Scientific, Oeco	Transformer 10169	10169	The Boeing Company 727	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-13848-01	10-60943-3	The Boeing Company 727	2011-04-19	current
Pacific Scientific, Oeco	Transformer 7076	7076	The Boeing Company 747-100, 747-200, 747-300	2011-04-19	current
Pacific Scientific, Oeco	Transformer 12311	12311	The Boeing Company 737-200, 737-300, 737-400	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-28247-02	310-28247-02	The Boeing Company DC-9-81 (MD-81), DC-9-82 (MD-82),...	2011-04-19	current
Pacific Scientific, Oeco	Transformer 6417	3651193	The Boeing Company DC-8-11, DC-8-12, DC-8-21	2011-04-19	current
Pacific Scientific, Oeco	Transformer 10163	10-60943-2	The Boeing Company 727	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-19573-01	6292	The Boeing Company DC-9-82 (MD-82), DC-9-83 (MD-83),...	2011-04-19	current
Pacific Scientific, Oeco	Transformer 6282	C-15875-1	The Boeing Company 707, 727	2011-04-19	current
Pacific Scientific, Oeco	Transformer 6292	7930666	The Boeing Company DC-9-11, DC-9-12, DC-9-13	2011-04-19	current
Pacific Scientific, Oeco	Transformer 10665	10665	The Boeing Company DC-8--61, -61F, -62	2011-04-19	current
Pacific Scientific, Oeco	Transformer 12627	12627	The Boeing Company 707-300, 737-200, 767-200	2011-04-19	current
Pacific Scientific, Oeco	Transformer 6292	6292	The Boeing Company MD-11, MD-11F	2011-04-19	current
Pacific Scientific, Oeco	Transformer 12406	AN7171	The Boeing Company DC-10-10, DC-10-10F, DC-10-15	2011-04-19	current
Pacific Scientific, Oeco	Transformer 12298	12298	The Boeing Company 747-100, 747-200, 747-300	2011-04-19	current
Pacific Scientific, Oeco	Transformer 10791	10-60828-6	The Boeing Company 737	2011-04-19	current
Pacific Scientific, Oeco	Transformer 12573	ALN7000	The Boeing Company DC-10-10, DC-10-10F, DC-10-15	2011-04-19	current
Pacific Scientific, Oeco	Transformer 12015	12015	The Boeing Company 747	2011-04-19	current
Pacific Scientific, Oeco	Transformer 10445	NBN6022	The Boeing Company DC-10-10, DC-10-10F, DC-10-15	2011-04-19	current
Pacific Scientific, Oeco	Transformer 12015	12015	The Boeing Company 747-200, 747-300, 747-400	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-13642-01	310-13642-01	The Boeing Company DC-9-81 (MD-81) DC-9-82 (MD-82)...	2011-04-19	current
Pacific Scientific, Oeco	Transformer 6426	5762825	The Boeing Company DC-8-11, DC-8-12, DC-8-21	2011-04-19	current
Pacific Scientific, Oeco	Transformer 6471	6471	Short Brothers PLC SD3-30, -60 SD3-60	2011-04-19	current
Pacific Scientific, Oeco	Transformer 10169	10169	The Boeing Company 727-200	2011-04-19	current
Pacific Scientific, Oeco	Transformer 12573	12573	The Boeing Company MD-11, MD-11F	2011-04-19	current
Pacific Scientific, Oeco	Transformer 10791	10-60828-6	The Boeing Company 737-100, 737-200, 727-200	2011-04-19	current
Pacific Scientific, Oeco	Transformer 314-13635-02	314-13635-02	The Boeing Company 747-200, 747-300, 747-SP	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-18132-01	310-18132-01	Bombardier CL600-2B19 Regional Jet	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-18831-01	310-18831-01	Fokker F27MK0050	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-18933-01	10-60828-17	The Boeing Company 737-300, 737-400, 737-500	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-19141-01	10-60828-18	The Boeing Company 737-200, 737-300, 737-400	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-13597-02	10-60828-9	The Boeing Company 707-300, 737-100, 737-200	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-19618-02	310-19618-02	The Boeing Company 777-200	2011-04-19	current
Pacific Scientific, Oeco	Transformer 6291	3645345	The Boeing Company DC-9-11, DC-9-12, DC-9-13	2011-04-19	current
Pacific Scientific, Oeco	Transformer 10380	10-3260-2	The Boeing Company 727	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-13602-02	10-60828-15	The Boeing Company 737-500, -600, -700	2011-04-19	current
Pacific Scientific, Oeco	Transformer 20288	10-60011-2	The Boeing Company 707, 747	2011-04-19	current
Pacific Scientific, Oeco	Transformer 16432	16432	The Boeing Company 707, 737	2011-04-19	current
Pacific Scientific, Oeco	Transformer 9985	9985	The Boeing Company 727	2011-04-19	current
Pacific Scientific, Oeco	Transformer 6307	10-3310	The Boeing Company 727	2011-04-19	current
Pacific Scientific, Oeco	Transformer 9451	10-3310-2	The Boeing Company 707, 720	2011-04-19	current
Pacific Scientific, Oeco	Transformer 16419	16419	The Boeing Company 737, 747	2011-04-19	current
Pacific Scientific, Oeco	Transformer 16422	16422	Short Brothers PLC SD3-30, -60 SD3-60	2011-04-19	current
Pacific Scientific, Oeco	Transformer 6444	5762825	The Boeing Company DC-8-11, DC-8-12, DC-8-21	2011-04-19	current
Pacific Scientific, Oeco	Transformer 16444	16444	Fokker F27, F28MK1000, F28MK2000	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-18833-01	10-60828-17	The Boeing Company 737-300, -400, -500	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-19141-01	10-60828-18	The Boeing Company 737-300, -400, -500	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-13598-02	10-60828-11	The Boeing Company 727-200	2011-04-19	current
Pacific Scientific, Oeco	Transformer 200-26570-01	200-26570-01	The Boeing Company 747-400	2011-04-19	current
Pacific Scientific, Oeco	Transformer 200-26567-01	200-26567-01	The Boeing Company MD-11, MD-11F	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-18844-01	310-18844-01	The Boeing Company 737-300, 737-400, 737-500	2011-04-19	current
Pacific Scientific, Oeco	Transformer 6558	10-3250-1	The Boeing Company 707-300, 720, 727-100	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-13597-02	10-60828-9	The Boeing Company 737-300, -400, -500	2011-04-19	current
Pacific Scientific, Oeco	Transformer 200-26604-02	200-26604-02	The Boeing Company 737-300 Series, 737-400 Series,...	2011-04-19	current
Pacific Scientific, Oeco	Transformer 16432	16432	The Boeing Company 707-300, 727-200, 737-200	2011-04-19	current
Pacific Scientific, Oeco	Transformer 6291	917240	The Boeing Company DC-9-11, DC-9-12, DC-9-13	2011-04-19	current
Pacific Scientific, Oeco	Transformer 080-20288-01	080-20288-01	The Boeing Company 767-200, 757-200	2011-04-19	current
Pacific Scientific, Oeco	Transformer 10844	10-60828-7	The Boeing Company 737	2011-04-19	current
Pacific Scientific, Oeco	Transformer 16444	16444	Fokker F28MK0100	2011-04-19	current
Pacific Scientific, Oeco	Transformer 10573	10-3260-4	The Boeing Company 727-200	2011-04-19	current
Pacific Scientific, Oeco	Transformer 16436	5762825	The Boeing Company DC-8-11, DC-8-12, DC-8-21	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-13644-01	7910960	The Boeing Company DC-9-11, DC-9-12, DC-9-13	2011-04-19	current
Pacific Scientific, Oeco	Transformer 12405	AAN7162	The Boeing Company DC-10-10, DC-10-10F, DC-10-15	2011-04-19	current
Pacific Scientific, Oeco	Transformer 16424	16424	The Boeing Company 707-300, 727-200, 747-100	2011-04-19	current
Pacific Scientific, Oeco	Transformer 16424	16424	The Boeing Company 707	2011-04-19	current
Pacific Scientific, Oeco	Transformer 6428	5777013	The Boeing Company DC-8-11, DC-8-12, DC-8-21	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-19618-02	310-19618-02	The Boeing Company 777-300 Series	2011-04-19	current
Pacific Scientific, Oeco	Transformer 12713	60B40026-25	The Boeing Company 747	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-13569-01	10-60828-10	The Boeing Company 727, 737	2011-04-19	current
Pacific Scientific, Oeco	Transformer 6291	6291	The Boeing Company MD-11, MD-11F	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-19083-01	310-19083-01	The Boeing Company 737-300, 737-400, 737-500	2011-04-19	current
Pacific Scientific, Oeco	Transformer 12311	AAN7034	The Boeing Company DC-10-10, DC-10-10F, DC-10-15	2011-04-19	current
Pacific Scientific, Oeco	Transformer 6291	6291	The Boeing Company MD-88	2011-04-19	current
Pacific Scientific, Oeco	Transformer 10715	10-3260-6	The Boeing Company 707-300	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-13601-01	10-60828-14	The Boeing Company 737	2011-04-19	current
Pacific Scientific, Oeco	Transformer 10273	7930666	The Boeing Company DC-9-11, DC-9-12, DC-9-13	2011-04-19	current
Pacific Scientific, Oeco	Transformer 12783	60B40026-27	The Boeing Company 757-200	2011-04-19	current
Pacific Scientific, Oeco	Transformer 6558	10-3250-1	The Boeing Company 727, 737	2011-04-19	current
Pacific Scientific, Oeco	Transformer 16423	16423	The Boeing Company 707	2011-04-19	current
Pacific Scientific, Oeco	Transformer 10747	10747	The Boeing Company 737-100, 737-200	2011-04-19	current
Pacific Scientific, Oeco	Transformer 10815	10815	The Boeing Company 727-200, 737-100, 737-200	2011-04-19	current
Pacific Scientific, Oeco	Transformer 10212	7930666	The Boeing Company DC-9-11, DC-9-12, DC-9-13	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-13639-01	7930621	The Boeing Company DC-9-11, DC-9-12, DC-9-13	2011-04-19	current
Pacific Scientific, Oeco	Transformer 10708	5917159	The Boeing Company DC-9-11, DC-9-12, DC-9-13	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-18831-01	310-18831-01	Fokker F28MK0100, F27MK050	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-19249-01	310-19249-01	The Boeing Company 737-300, -400, -500	2011-04-19	current
Pacific Scientific, Oeco	Transformer 200-26512-01	200-26512-01	Lockheed Martin Corporation L-1011-385-1, -1-14, -1-15	2011-04-19	current
Pacific Scientific, Oeco	Transformer 6430A	6430A	The Boeing Company 727-100, -200	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-13569-02	10-60828-10	The Boeing Company 737-100, -200, -300	2011-04-19	current
Pacific Scientific, Oeco	Transformer 16432	16432	The Boeing Company 737-100, -200, -300	2011-04-19	current
Pacific Scientific, Oeco	Transformer 12713	12713	The Boeing Company 747-200	2011-04-19	current
Pacific Scientific, Oeco	Transformer 6282	10-3256	The Boeing Company 707-300, 727-200, 720	2011-04-19	current
Pacific Scientific, Oeco	Transformer 6332	10-3254	The Boeing Company 707-300, 727-200, 737-200	2011-04-19	current
Pacific Scientific, Oeco	Transformer 6623B	6623B	The Boeing Company 737-200, 737-300	2011-04-19	current
Pacific Scientific, Oeco	Transformer 10615	10615	The Boeing Company 757-200	2011-04-19	current
Pacific Scientific, Oeco	Transformer 26437	26437	Lockheed Martin Corporation L-1011-385-1, -1-14, -1-15	2011-04-19	current
Pacific Scientific, Oeco	Transformer 16446	5764881	The Boeing Company DC-8-11, DC-8-12, DC-8-21	2011-04-19	current
Pacific Scientific, Oeco	Transformer 6907	6907	The Boeing Company 737-300, -400, -500	2011-04-19	current
Pacific Scientific, Oeco	Transformer 080-20705-01	10-3257-6	The Boeing Company 737-700	2011-04-19	current
Pacific Scientific, Oeco	Transformer 10445	3952138	The Boeing Company DC-9-11, DC-9-12, DC-9-13	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-19664-01	310-19664-01	The Boeing Company 777-200	2011-04-19	current
Pacific Scientific, Oeco	Transformer 10615	10615	Lockheed Martin Corporation L-1011-385-1, -1-14, -1-15	2011-04-19	current
Pacific Scientific, Oeco	Transformer 16425	16425	The Boeing Company 707-120, -320, -720	2011-04-19	current
Pacific Scientific, Oeco	Transformer 6623B	6623B	The Boeing Company 707	2011-04-19	current
Pacific Scientific, Oeco	Transformer 200-26513-01	200-26513-01	Lockheed Martin Corporation L-1011-385-1, -1-14, -1-15	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-14416-01	310-14416-01	The Boeing Company 777-200	2011-04-19	current
Pacific Scientific, Oeco	Transformer 310-13641-01	7930625	The Boeing Company DC-9-11, DC-9-12, DC-9-13	2011-04-19	current

The first 150 of 400.

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.