Airworthiness Directive · Amendment 39-8856 · The Boeing Company Airplanes
The Boeing Company Airplanes
This AD applies to The Boeing Company 707-300 Series, 707-300B Series, 707-300C Series, 707-400 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 Boeing Model 707 series airplanes, that requires the incorporation of a certain structural modification of the wing front spar lower chord. This amendment is prompted by an evaluation and recommendation by the Airworthiness Assurance Task Force to mandate the actions described in certain Boeing service bulletins as part of the "Aging Airplane Structural Modification Program." The actions specified by this AD are intended to prevent reduced structural integrity of the wing. The actions also reflect the FAA's decision that long term continued operational safety should be assured by actual modification of the airframe rather than repetitive inspections.
