Airworthiness Directive · Amendment 39-15343 · Boeing Model 727 Airplanes
Boeing Model 727 Airplanes
This AD applies to all Boeing Model 727, 727C, 727-100, 727-100C, 727-200, and 727-200F series airplanes, certificated in any category.
We are adopting a new airworthiness directive (AD) for all Boeing Model 727 airplanes. This AD requires repetitive external high frequency eddy current (HFEC) inspections of the crown skin for cracks at certain stringer attachment holes, and repair if necessary. This AD results from a report of cracks at multiple locations on certain areas of the crown skin. We are issuing this AD to detect and correct fatigue cracks of the crown skin, which could result in rapid decompression of the airplane.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Before the accumulation of 66,000 total flight cycles, or within 3,500 flight cycles after the effective date of this AD, whichever occurs later, do an external high frequency eddy current inspection of the crown skin for cracks at stringer attachment holes between stringer 11 left and stringer 11 right and from body station (BS) 259.5 to BS 1183. Repair any crack found before further flight. Do the actions in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 727-53A0224, dated April 10, 2003, except as provided by paragraph (g) of this AD. Repeat the inspection at intervals not to exceed 3,500 flight cycles.
(g) Although Boeing Alert Service Bulletin 727-53A0224, dated April 10, 2003, specifies to submit certain information to the manufacturer, this AD does not include that requirement.
