Which airborne incident would require that the nearest NTSB field office be notified immediately?

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Operating regulations for U.S.-registered civil airplanes require that during movement on the surface, takeoffs, and landings, a seat belt and shoulder harness (if installed) must be properly secured about each

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Who is primarily responsible for maintaining an aircraft in an airworthy condition?

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During flight a fire, which was extinguished, burned the insulation from a transceiver wire. What action is required by regulations?

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