Airworthiness Directive · Amendment 39-9350 · The Boeing Company Airplanes
The Boeing Company Airplanes
This AD applies to The Boeing Company 757-200 Series, 757-200CB Series, 757-200PF Series, 757-300 Series, 767-200 Series, 767-300 Series, 767-300F 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 757 and 767 series airplanes, that requires replacement of the hydraulic pressure transfer tube of the ram air turbine (RAT) system with a new hose assembly. This amendment is prompted by reports that, during flight tests, the hydraulic pressure transfer tube of the RAT cracked when the RAT was extended on a Model 767 series airplane due to overload of the hydraulic transfer tube. The actions specified by this AD are intended to prevent such overload, which could result in cracking of the hydraulic transfer tube. Such cracking subsequently could lead to the loss of hydraulic fluid of the center system and the inability of the RAT to pressurize the center system; this situation could lead to loss of all hydraulic system power in the event that power is lost in both engines.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
