Parts · Electrical power

Gcu

307 failure reports named the gcu in the last ten years, 994 since 1995, most often on the Boeing 767; the condition most often found was "failed". 12 FAA approvals let 3 companies make a replacement gcu, Hamilton Sundstrand Corporation holding the most (10).

Reports by year

Reports by year, as a table

	reports
1995	11
1996	26
1997	25
1998	45
1999	45
2000	35
2001	35
2002	42
2003	41
2004	25
2005	22
2006	22
2007	26
2008	28
2009	51
2010	44
2011	40
2012	39
2013	41
2014	15
2015	29
2016	25
2017	26
2018	36
2019	34
2020	35
2021	28
2022	13
2023	22
2024	35
2025	25
2026	28

Which system the reports file it under last ten years

Electrical power297Engine6Flight controls2Landing gear1Heating, ice protection and utility systems1

Reports by system, as a table

	reports
Electrical power	297
Engine	6
Flight controls	2
Landing gear	1
Heating, ice protection and utility systems	1

Models most often reporting it last ten years

Boeing 76767Boeing 73735Boeing 75726Airbus A30021Airbus A32120Messerschmitt-Bolkow-Blohm BK 11719Boeing 77714Bombardier CL-600 Challenger and CRJ13Airbus A3209Embraer ERJ 170 E170 and E1759Airbus A3198Bombardier DHC-8 Dash 8 and Q4006

Models most reported, as a table

	reports
Boeing 767	67
Boeing 737	35
Boeing 757	26
Airbus A300	21
Airbus A321	20
Messerschmitt-Bolkow-Blohm BK 117	19
Boeing 777	14
Bombardier CL-600 Challenger and CRJ	13
Airbus A320	9
Embraer ERJ 170 E170 and E175	9
Airbus A319	8
Bombardier DHC-8 Dash 8 and Q400	6

How it failed the condition found, last ten years

failed106malfunctioned49faulted48faulty32inoperative17defective7disconnected5unknown5warning message5damaged4

Conditions found, as a table

	reports
failed	106
malfunctioned	49
faulted	48
faulty	32
inoperative	17
defective	7
disconnected	5
unknown	5
warning message	5
damaged	4

Engines most often reporting it

Rolls-Royce RB-211 series 2CFM International CFM56 series 1Garrett (Honeywell) TPE331-10N 1International Aero Engines PW1133GA-JM 1International Aero Engines V2524-A5 1Pratt & Whitney Canada PT6A-42A 1Pratt & Whitney JT8D-219 1Pratt & Whitney PT6A series 1Pratt & Whitney PW2037 1Rolls-Royce RB211-535E4 1

Approved replacement parts 12 parts manufacturer approvals

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

Hamilton Sundstrand Corporation 10Rapco INC 1Lucas Aerospace Equipment CORP 1

For these models most: Mcdonnell Douglas DC-10 (2), Airbus BD-500 (2), Airbus A330 (2), Airbus A300 (2), Israel Aircraft Industries ASTRA SPX (1), Douglas DC-10 (1), Boeing 747 (1), Airbus Canada Ltd Ptnrsp BD-500 (1).

Maker	Part	Replaces	Fits	Granted	Status
Hamilton Sundstrand Corporation	GCU 1714668M	C07500000	Airbus Canada... BD-500-1A10, BD-500-1A11	2024-10-15	current
Hamilton Sundstrand Corporation	GCU 1714668L	C07500031-009	C Series Aircraft... CSALP) (BD-500-1A10, BD-500-1A11	2019-04-15	current
Hamilton Sundstrand Corporation	GCU 976J931-4	Airbus P/N 976J931-4	Airbus A300-B2-1A, B2-1C, B2K-203	2007-05-29	current
Hamilton Sundstrand Corporation	GCU 758930G	Gulfstream 1159SCAV502-1	Gulfstream V	2002-12-12	current
Rapco INC	GCU - Generator Control Unit 976J862-16	Boeing 976J862-16	McDonnell Douglas DC-10-10, -10F, -30	1998-11-03	current
Hamilton Sundstrand Corporation	GCU - Generator Control Unit 976J862-16	Boeing 976J862-16	McDonnell Douglas DC-10-10, -10F, -30	1998-10-18	current
Hamilton Sundstrand Corporation	GCU - Generator Control Unit 977J003-10	Boeing 977J003-10	McDonnell Douglas DC-10-40	1998-10-18	current
Lucas Aerospace Equipment CORP	GCU - Generator Control Unit 51539-010A	Israel Aircraft Industries Ltd. V25W8320 02-001	Gulfstream ASTRA-SPX	1998-03-04	current
Hamilton Sundstrand Corporation	GCU 976J931-4	Airbus 976J931-4	Airbus A300-B2-1A, B2-1C, B2K-203	1996-09-09	current
Hamilton Sundstrand Corporation	GCU 976J931-3	Airbus 976J931-3	Airbus A330-301	1996-04-24	current
Hamilton Sundstrand Corporation	GCU 976J931-2	Airbus 976J931-2	Airbus A330-301	1996-04-24	current
Hamilton Sundstrand Corporation	GCU 746011K	Boeing 746011K	Boeing 747-400	1995-12-06	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.