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Ground Fault Interrupt (GFI)

Product Information

FAA safety regulation SFAR 88 requires transport-category aircraft manufacturers to modify fuel systems to eliminate the possibility of an ignition source developing within a fuel tank.

Boeing has selected Esterline Power Systems as the exclusive provider of Fault Current Detection (FCD) and Ground Fault Interrupt (GFI) relays to satisfy SFAR 88. Our GFI relays sense fuel pump ground faults, while our FCD relays  sense fuel pump ground faults and phase-to-phase shorts in the fuel pump and up-stream wiring. Through the use of a proprietary electronic circuit design, Esterline Power Systems GFI and FCD relays will detect these faults and open the circuit within milliseconds, thereby minimizing the potential of fuel-system combustion. Esterline Power Systems GFI relays have been selected for retrofit as well as for new production of 727, 737, 747, 757, 767, and 777 aircraft and FCD relays to retrofit all DC-10, MD-10 and MD-11 aircraft.

Press Releases

 Leach International’s Ground Fault Interrupt (GFI) Relay To Be Installed on A380 Aircraft (February 2005)
 Boeing Selects Leach International Fault Current Detection and Ground Fault Interrupt Relays (Dec. 2003)


 “Ground Fault Protection” from Avionics Magazine . featuring the Leach International GFI solution

Technical Papers

 Ground Fault Protection
 Arc Fault Detector


 Aircraft Ground Fault Detection & Isolation

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