Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Boeing Model 737-100, -200, -200C, -300, -400, and -500 series airplanes. This proposal would require a one-time inspection to determine whether the lower bearing support of the aileron transfer mechanism directly below the first officer's control column has a "pocket," and follow-on corrective actions, if necessary. This action is necessary to prevent jamming of the first officer's control wheel due to the presence of a foreign object on the lower bearing support of the transfer mechanism, which could result in reduced controllability of the airplane. This action is intended to address the identified unsafe condition.