Summary
We propose to supersede Airworthiness Directive (AD) 2016-18- 01, which applies to certain The Boeing Company Model 737-600, -700, - 700C, -800, -900, and -900ER series airplanes. AD 2016-18-01 requires repetitive lubrication of the forward and aft trunnion pin assemblies of the right and left main landing gears (MLGs); repetitive inspection of these assemblies for corrosion and chrome damage, and related investigative and corrective actions, if necessary; and installation of new or modified trunnion pin assembly components, which terminates the repetitive lubrication and repetitive inspections. Since we issued AD 2016-18-01, we have determined that rotable parts were not addressed in that AD and that all airplanes of the affected models, excluding those with a certain configuration, should be inspected to determine if affected MLG trunnion pin assemblies are installed. This proposed AD would therefore add airplanes to the applicability. We are proposing this AD to address theunsafe condition on these products.