Superseded. This AD was superseded by AD 2018-23-09. Verify which one applies to your serial and effectivity before any maintenance action.
AD 2016-13-16
Effective 08/12/2016 · Published 07/08/2016
Airworthiness Directives; The Boeing Company Airplanes
Summary
We are adopting a new airworthiness directive (AD) for all The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes. This AD was prompted by reports of a manufacturing oversight, in which a supplier omitted the required protective finish on certain bushings installed in the rear spar upper chord on horizontal stabilizers, which could lead to galvanic corrosion and consequent cracking of…