| 1. | Without an airworthiness certificate, aircraft are not permitted to fly.
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| 2. | The jet spends six weeks at Edwards testing its basic airworthiness.
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| 3. | That was a violation of airworthiness regulations, the agency said.
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| 4. | It was his office that recommended that airworthiness certification be withdrawn.
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| 5. | Further testing and research are needed in tilt-rotor airworthiness,
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| 6. | Analysts say Concorde's airworthiness certification should speak for itself.
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| 7. | Even with the greatest attention to airworthiness, accidents still occur.
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| 8. | The ULF 2 received its Certificate of Airworthiness in February 1995.
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| 9. | The plane undertook its airworthiness test on July 26, 1990.
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| 10. | Airworthiness tests were conducted on the aircraft on 25 February 2016.
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