Browse Publications Technical Papers 2001-01-2926
2001-09-11

Lightning Current Levels in Aircraft Fuel System Plumbing 2001-01-2926

Lightning currents passing through fuel system tubing and other conductors in fuel tanks have long been recognized as potential fuel vapor ignition sources. Tests have been conducted on joints, interfaces, and flexible couplers to verify their ability to conduct lightning currents without creating ignition hazards. Prior to the work reported here, there has been very little data upon which to select representative current and voltage levels for these tests.
Using the worst case data (amplitudes and durations) obtained from tests on a Bombardier Dash 8 Q100 representative wing box fuel system, test levels for internal plumbing components were proposed. Using a 6 dB margin on amplitude and a 6 dB margin on duration (2 to 3 times the measured amplitudes and durations for a 12 dB margin overall), the following test levels and waveforms were suggested for testing fuel system components used in this type of medium-sized commuter aircraft:
  • fuel system components exposed to Zone 3 currents would be subjected to Waveform (WF) 5B currents (as defined in SAE ARP5412) at 375 A
  • fuel system components exposed to Zone 2A currents (through a connection to surfaces subject to direct strike attachment) would be subjected to WF 5B currents of 1,100 A
  • fuel system components designed to prevent induced currents would be subjected to WF 4 voltages of 300 V

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Protection from Ignition Sources Due to Lightning, EMI and Wire Harness Shorts for Aircraft Fuel Tank Gauging Systems

2000-01-2120

View Details

TECHNICAL PAPER

Resistive Slab Modeling for Predicting Lightning Currents in Fastened Composite Structure

2001-01-2875

View Details

TECHNICAL PAPER

Factors Affecting Fuel System Certification Against Lightning Hazards

2001-01-2902

View Details

X