AD 91-09-09

91-09-09 BOEING: Amendment 39-6973. Docket No. 90-NM-239-AD. Supersedes AD 89- 23-13.

Applicability: Model 727-200 series airplanes, except line number 001 through 765 which are currently subject to the inspection requirements of AD 76-13-01 (inspections adjacent to stringer (S) 28L and S-28R from body station (BS) 700 to BS 720), certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To prevent rapid decompression of the airplane, accomplish the following:

A. Within 15 days after November 20, 1989 (the effective date of Amendment 39- 6388, AD 89-23-13), conduct an external detailed visual inspection for cracks and corrosion of the fuselage skin adjacent to stringer (S) 28L and S-28R from body station (BS) 700 to BS 720, in accordance with Boeing Alert Service Bulletin 727-53A0203, dated October 20, 1989, or Revision 1, dated April 26, 1990. Any cracks or corrosion must be repaired prior to further flight, in accordance with the service bulletin.

B. Within 12 months after the initial inspection required by paragraph A. of this AD, or 6 months after the effective date of this AD, whichever occurs later, and thereafter at intervals not to exceed 12 months, repeat the inspection required by paragraph A. of this AD.

C. Modification in accordance with paragraph I. of the Accomplishment Instructions of Boeing Alert Service Bulletin 727-53A0203, Revision 1, dated April 26, 1990, constitutes terminating action for the inspections required by paragraph B. of this AD.

D. An alternative method of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Seattle Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate.

NOTE: The request should be forwarded through an FAA Principal Maintenance Inspector, who may concur or comment and then send it to the Manager, Seattle ACO.

E. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD.

All persons affected by this directive who have not already received the appropriate service documents from the manufacturer may obtain copies upon request to Boeing Commercial Airplane Group, P.O. Box 3707, Seattle, Washington 98124. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, Washington.

Airworthiness Directive 91-09-09 supersedes AD 89-23-13, Amendment 39-6388. This amendment (39-6973, AD 91-09-09) becomes effective on May 28, 1991.