Airworthiness Directive · Amendment 39-17758 · Fuselage
the Boeing Company Airplanes
This AD applies to The Boeing Company Model 727-200 and 727-200F series airplanes, certificated in any category, line numbers 1103 and subsequent.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 727-200 and 727-200F series airplanes. This AD is intended to complete certain mandated programs intended to support the airplane reaching its limit of validity (LOV) of the engineering data that support the established structural maintenance program. This AD requires a one-time inspection for cracking of the pressure floor of both main wheel wells, and related investigative and corrective actions if necessary; and modifying the pressure floor of both main wheel wells. We are issuing this AD to prevent fatigue cracking in the pressure floor of the main wheel wells, which could lead to rapid loss of cabin pressurization.
Before the accumulation of 60,000 total flight cycles, or within 24 months after the effective date of this AD, whichever occurs later: Do a one-time detailed inspection for cracking of the pressure floor of both main wheel wells, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 727-53A0124, Revision 3, dated November 30, 1989, except as specified in paragraph (h) of this AD. If any indication of distress is found (such as cracking or flaked paint): Before further flight, do an eddy current inspection or penetrant inspection for cracking of the pressure floor of both main wheel wells, and do all applicable related investigative and corrective actions, by accomplishing all the actions specified in the Accomplishment Instructions of Boeing Service Bulletin 727-53A0124, Revision 3, dated November 30, 1989. Do all applicable related investigative and corrective actions before further flight.
Where Boeing Service Bulletin 727-53A0124, Revision 3, dated November 30, 1989, specifies a close visual inspection, this AD requires a detailed inspection, which is an intensive examination of a specific item, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at an intensity deemed appropriate. Inspection aids such as mirror, magnifying lenses, etc., may be necessary. Surface cleaning and elaborate procedures may be required.
Before further flight after accomplishing the actions required by paragraph (g) of this AD: Do a preventive modification of the pressure floor of both main wheel wells, in accordance with Part III of the Accomplishment Instructions of Boeing Service Bulletin 727-53A0124, Revision 3, dated November 30, 1989.
