AD 2025-21-01
Unsafe Condition
Cracks on the upper hex portion of pressure relief valve (PRV) adaptors could lead to uncontrolled leakage of liquefied petroleum gas (LPG), resulting in an in-flight fire and consequent emergency landing.
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Required Actions
Visually check the fuel cylinder PRV adaptor for cracks, remove any fuel cylinder with a cracked PRV adaptor from service, and replace the PRV adaptor as terminating action for the repetitive checks.
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Compliance Time
Within 50 flight hours
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Affected Aircraft
Cameron Balloons Ltd. fuel cylinders fitted with certain pressure relief valve (PRV) adaptors on hot air balloons.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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