AD 93-25-11

Final rule

93-25-11 SHORT BROTHERS, PLC: Amendment 39-8776. Docket 93-NM-75-AD. Supersedes AD 93-01-06, Amendment 39-8460 which superseded AD 89-07-14, Amendment 39-6176.
Applicability: Model SD3-60 series airplanes; serial numbers SH3601 through SH3691 inclusive, and SH3694; certificated in any category.

Compliance: Required as indicated, unless accomplished previously.

To prevent loss of the structural integrity of the horizontal stabilizer attachment to the fuselage, accomplish the following:

(a) Perform a visual inspection at the aft face of the rear spar web-to-boom riveting, top and bottom, between the fuselage attach fittings at 12.5 inches left and right of the airplane center line to detect loose, missing, or failed rivets in accordance with Shorts Service Bulletin SD360-55-16, dated April 1988, prior to the times specified in paragraphs (a)(1) and (a)(2) of this AD, as applicable. Repeat the inspection thereafter at intervals not to exceed 1,000 landings.(1) For airplanes on which the inspections (at the forward face of the rear spar web- to-boom riveting) required by AD 93-01-06, amendment 39-8460, have been accomplished previously and on which Modification 7948 has not been accomplished: Within 1,000 landings after the last inspection accomplished in accordance with AD 93-01-06, or within 100 landings after the effective date of this AD, whichever occurs later.

(2) For airplanes on which the inspections required by AD 93-01-06 have not been accomplished previously and on which Modification 7948 has not been accomplished: Inspect prior to the times specified in paragraphs (a)(2)(i) and (a)(2)(ii) of this AD, as applicable.

(i) For airplane serial numbers SH3680 through SH3691 inclusive, and SH3694; and for airplanes affected by this AD that have only used a 15-degree takeoff flap setting since before or upon reaching 5,000 landings: Prior to the accumulation of 12,000 total landings, or within 100 landings after theeffective date of this AD, whichever occurs later.
(ii) For airplanes other than those affected by paragraph (a)(2)(i) of this AD: Prior to the accumulation of 8,000 total landings, or within 100 landings after the effective date of this AD, whichever occurs later.
(b) If any defective rivet is found as a result of any inspection required by this AD, prior to further flight, repair in accordance with Part II of Shorts Service Bulletin SD360-55-16, dated April 1988. Following that repair, continue to perform the repetitive inspections required by paragraph (a) of this AD.

(c) Modification of the horizontal stabilizer spar webs (Modification 7948) in accordance with Shorts Service Bulletin SD360-55-12, Revision 2, dated November 1986, constitutes terminating action for the repetitive inspections required by paragraph (a) of this AD.

(d) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Standardization Branch, ANM-113, FAA, Transport Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Standardization Branch, ANM-113.

NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Standardization Branch, ANM-113.

(e) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished.

(f) The inspections, repair, and modification shall be done in accordance with the following Shorts service bulletins, which contain the specified effective pages:

Service Bulletin
and Date

Page Number
Revision Level
Shown on Page
Date
Shown on Page
SD360-55-16
April 1988
1-7
Original
April 1988
SD360-55-12
Revision 2
November 1986
1,4-5, 7-44

2-3, 6
2

Original
November 1986

April 1986

The incorporation by reference of these documents was approved previously by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51 as of March 2, 1993 (58 FR 6085). Copies may be obtained from Short Brothers PLC, 2011 Crystal Drive, Suite 713, Arlington, Virginia 22202-3719. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.

(g) This amendment becomes effective on January 26, 1994.