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Mon, Jan 09, 2012

AD: The Boeing Company Airplanes

AD NUMBER: 2011-27-03

MANUFACTURER: All Boeing Model 737 airplanes
SUBJECT: Airworthiness Directive 2011-27-03
ACTION: Final rule

SUMMARY: The FAA is adopting a new airworthiness directive (AD) for all Model 737 airplanes.

This AD was prompted by a report of extensive corrosion of a ballscrew used in the drive mechanism of the horizontal stabilizer trim actuator (HSTA). This AD requires repetitive inspections, lubrications, and repetitive overhauls of the ball nut and ballscrew and attachment (Gimbal) fittings for the trim actuator of the horizontal stabilizer; various modification(s); and corrective actions if necessary; as applicable.

The FAA is issuing this AD to prevent an undetected failure of the primary load path for the ballscrew in the drive mechanism of the HSTA and subsequent wear and failure of the secondary load path, which could lead to loss of control of the horizontal stabilizer and consequent loss of control of the airplane.

DATES: This AD is effective February 10, 2012

FMI: AD

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