AIRCRAFT PROTECTION FROM THUNDERSTORM ELECTROMAGNETIC EFFECTS-I (FIN CAP AND RADOME ANTENNA SYSTEM LIGHTNING PROTECTION)
LIGHTNING AND TRANSIENTS RESEARCH INST ST PAUL MN
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Thunderstorm lightning to aircraft reports from over 700 incidents are tabulated and, although the data on jets is not yet complete, show the greatest incidence of strikes to occur near 0 C and around 10,000 ft altitudes with some lightning incidents at 40,000 ft. Point-of-strike frequencies are also tabulated. Applications of artificial lightning generators and model studies to determine point-of-strike probabilities and reproduce natural lightning in- flight effects are discussed. Specific topics included are the use of HF lightning arresters to protect the antenna and radio equipment, and the use of graded resistance diverter rods to provide localized point-of-strike control. The development of radome protection is also discussed in detail with particular emphasis on foil strip protection systems and proper use of bonding wires. The extension of HF protection systems of VHF and UHF antennas, and possible fuel tank and fuel vent hazards from lightning discharges and the feasibility and need for an increased test facility to enable tests on full scale aircraft to be made more effectively are also discussed.
- Military Aircraft Operations