Airworthiness Directives; Lockheed Model 382, 382B, 382E, 382F, and 382G Series Airplanes

We are adopting a new airworthiness directive (AD) for all Lockheed Model 382, 382B, 382E, 382F, and 382G series airplanes. This AD requires an inspection to identify discrepant barrel nuts in the upper wing joint, engine truss, and rear beam pylon support; and replacement of any discrepant barrel nut with a new barrel nut, if necessary. This AD results from a report of severe cracking of multiple barrel nuts in the wing station (WS) 220 upper wing joint found during scheduled maintenance. We are issuing this AD to prevent cracking of the barrel nuts in the upper wing joint, engine truss, and rear beam pylon support, which could result in reduced structural integrity of the affected part and consequent detachment of the wing or engine from the airplane.