Airworthiness Directive · Amendment 39-10010 · Boeing Model 737-100, -200, -300, -400, and -500 Series Airplanes
Boeing Model 737-100, -200, -300, -400, and -500 Series Airplanes
Superseded. A later AD replaced this one: AD 2000-02-18, AD 2002-20-07. Comply with the one in force.
Model 737-100, -200, -300, -400, and -500 series airplanes equipped with a rudder power control unit (PCU) having part number (P/N) 65-44861-( ) and a serial number less than 1252A; or an aileron or elevator PCU having P/N 65-44761-( ) (except those having P/N's that contain an "ss") and a serial number less than 5360A; certificated in any category.
This amendment adopts a new airworthiness directive (AD), applicable to all Boeing Model 737-100, -200, -300, -400, and -500 series airplanes, that requires an inspection of reworked aileron/ elevator power control units (PCU's) and rudder PCU's to determine if reworked PCU manifold cylinder bores containing chrome plating are installed, and replacement of the cylinder bores with bores that have been reworked using the oversize method or the steel sleeve method, if necessary. This amendment is prompted by a review of the design of the flight control systems on Model 737 series airplanes. The actions specified by this AD are intended to prevent a reduced rate of movement of the elevator, aileron, or rudder due to contamination of hydraulic fluid from chrome plating chips; such reduced rate of movement, if not corrected, could result in reduced controllability of the airplane.
