AD 93-20-06

93-20-06 AYRES CORPORATION: Amendment 39-8714; Docket No. 93-CE-31-AD.

Applicability: The following model and serial number airplanes, certificated in any category:

Models Serial Numbers S2D all serial numbers S2R 5000 through 5099, 1380R, and 1416R through 2582R S2R-R1340 R1340-001 through R1340-028 (with or without DC suffix) S2R-R3S R3S-001 through R3S-011 (with or without DC suffix) S2R-R1820 R1820-001 through R1820-035 (with or without DC suffix) S2R-T11

T11-001 through T11-005 (with or without DC suffix) S2R-T15 T15-001 through T15-029 (with or without DC suffix); and T27-001 through T27-029 (with or without DC suffix) S2R-T34 6000 through 6049, T34-001 through T34-143, T34-145, T34-147 through T34-167, T34-170, T34-171, and T34-180 (with or without DC suffix); and T41-001 through T41-143, T41-145, T41-147 through T41-167, T41-170, T41-171, and T41-180 (with or without DC suffix) S2R-T45 T45-001 (with or without DC suffix)

Compliance: Required as indicated, unless already accomplished.

NOTE 1: The compliance times specified in this AD take precedence over those referenced in Ayres Service Bulletin (SB) No. SB-AG-33, dated February 24, 1993.

To prevent structural damage to the wing caused by damaged aluminum outboard wing huckbolts, which could result in loss of control of the airplane, accomplish the following:

(a) Within the next 50 hours time-in-service after the effective date of this AD, inspect the existing aluminum outboard wing huckbolts for cracks, shearing, or fatigue in accordance with the ACCOMPLISHMENT INSTRUCTIONS: I. Inspection, section of Ayres SB No. SB-AG-33, dated February 24, 1993.

(1) If sheared, cracked, or fatigued aluminum outboard wing huckbolts are found, prior to further flight, replace the last 13 vertical rows of aluminum huckbolts with NAS 1103 steel bolts or with steel huckbolts in accordance with the ACCOMPLISHMENT INSTRUCTIONS: II. Repair, section of Ayres SB No. SB-AG-33, dated February 24, 1993.

(2) If no cracked, sheared, or fatigued huckbolts are found, reinspect at intervals not to exceed 100 hours TIS. Accomplish no more than five 100-hour inspection repetitions before replacing the huckbolts as required by paragraph (b) of this AD.

NOTE 2: The FAA established the compliance times of the initial inspection and the repetitive inspections to coincide with the replacement compliance time specified in paragraph (b) of this AD.

(b) Within the next 650 hours TIS after the effective date of this AD, unless already accomplished in accordance with paragraph (a)(1) of this AD, replace the last 13 vertical rows of aluminum huckbolts with NAS 1103 steel bolts or with steel huckbolts in accordance with the ACCOMPLISHMENT INSTRUCTIONS: II. Repair, section of Ayres SB No. SB-AG-33, dated February 24, 1993.

NOTE 3: The FAA established the replacement compliance time by estimating airplane operation rates in order to allow the operator the opportunity to accomplish the action during the next annual maintenance inspection.

(c) Replacing the huckbolts as specified in paragraph (b) of this AD eliminates the inspection requirement of this AD and may be accomplished prior to 650 hours TIS.

(d) 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.

(e) An alternative method of compliance or adjustment of the initial or repetitive compliance times that provides an equivalent level of safety may be approved by the Manager, Atlanta Aircraft Certification Office, 1669 Phoenix Parkway, Suite 210C, Atlanta, Georgia 30349. The request shall be forwarded through an appropriate FAA Maintenance Inspector, who may add comments and then send it to the Manager, Atlanta Aircraft Certification Office. NOTE 4: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Atlanta Aircraft Certification Office.

(f) The inspection and replacement required by this AD shall be done in accordance with Ayres Service Bulletin No. SB-AG-33, dated February 24, 1993. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from the Ayres Corporation, P.O. Box 3090, Albany, Georgia 31708. Copies may be inspected at the FAA, Central Region, Office of the Assistant Chief Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri, or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.

(g) This amendment (39-8714) becomes effective on December 3, 1993.