Airworthiness Directive · Amendment 39-9712 · The Boeing Company Airplanes
The Boeing Company Airplanes
Superseded. A later AD replaced this one: AD 2000-15-18. Comply with the one in force.
This AD applies to The Boeing Company 737-100 Series, 737-200 Series, 737-200C Series.
The models as the FAA's AD index lists them. The serial ranges, installed parts and exceptions are in the AD itself: read it at the FAA.
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 737-100 and -200 series airplanes, that requires inspections to detect cracking of the support fittings of the Krueger flap actuator and, if necessary, replacement of existing fittings with new steel fittings and modification of the aft attachment of the actuator. This amendment is prompted by reports of cracking due to fatigue and stress corrosion of the support fittings of the Krueger flap actuator. The actions specified by this AD are intended to prevent such cracking, which could result in fracturing of the actuator attach lugs, separation of the actuator from the support fitting, severing of the hydraulic lines, and resultant loss of hydraulic fluids. These conditions, if not corrected, could result in possible failure of one or more hydraulic systems, and subsequent reduced controllability of the airplane.
