Mooney M20A — Service Bulletins

This Service Bulletin M20-345A, issued by Mooney International Corporation on December 13, 2022, addresses the replacement of hybrid elevator weights on specific Mooney aircraft models. The bulletin primarily affects M20F aircraft with smooth skin elevators and outlines the procedures for inspecting and replacing the hybrid balance weights (P/N 430018-1) with solid lead weights (P/N 430016-7). The bulletin is crucial for ensuring the safety and airworthiness of the affected aircraft, as it addresses issues related to galvanic corrosion and structural integrity of the elevator balance weights. Compliance is required before the next flight and during annual inspections until the replacement is completed.

• Affected models include M20C, M20D, M20E, M20F, and M20G with serial numbers 680170 or earlier.
• Replace hybrid elevator weights (P/N 430018-1) with solid lead weights (P/N 430016-7).
• Maximum allowable static unbalance moment: 22.0 inch/pounds (1.725 pounds) at 12.75 inches aft of hinge line.
• Minimum allowable static unbalance moment: 20.00 inch/pounds (1.57 pounds) at 12.75 inches aft of hinge line.
• Inspection for cracks or damage to the hybrid weights is mandatory before flight.