AD 90-13-02

90-13-02 GULFSTREAM AEROSPACE CORP: Amendment 39-6660. Docket No. 90-NM-126-AD. Final copy of Priority Letter issued June 14, 1990.

Applicability: Model G-1159 (G-II) series airplanes, serial numbers as follows, certificated in any category:

001 011 021 031 040 050 061 002 012 022 033 041 051 063 003 013 023 034 043 052 065 005 014 024 035 044 053

006 015 025 037 045 055

007 017 026 038 046 056

008 018 027 039 047 057

010 019 028

049 059

020 029

Compliance: Required as indicated, unless previously accomplished.

To prevent reduced structural integrity of the wing, accomplish the following:

A. Within the next 10 days after the effective date of this AD, perform the following inspections:

1. Perform a visual inspection to detect corrosion or cracks in the wing rear beam/upper cap angle, wing upper aft plank, and the clothespin attach fitting, part number 1159WM20016, located at fuselage station 452.

2. Inspect the lower cavity of the clothespin attach fitting, using a 4.9 mm or smaller flexible borescope through the existing drain hole. If no drain hole exists, prior to further flight, install a drain hole in accordance with Gulfstream G-II Customer Bulletin No. 42, Section V, dated December 15, 1969.

3. Inspect the upper cavity of the clothespin attach fitting, using the borescope through the gaps where the clothespin mates with the fitting. If foam filler is present and the inspection cannot be accomplished, prior to further flight, perform the inspection in accordance with a method approved by the Manager, Atlanta Aircraft Certification Office, FAA, Central Region.

4. Inspect the wing upper aft plank adjacent to the clothespin fitting for corrosion or defects using pulse echo ultrasonic equipment (CAUTION: a machined step in this area may be misinterpreted as material loss.)

B. If corrosion or cracks are found, prior to further flight, replace the affected parts or repair the corroded area in a manner approved by the Manager, Atlanta Aircraft Certification Office, FAA, Central Region.

C. Within 7 days after accomplishing the inspections required by paragraph A., above, submit a written report of the inspection results to the Manager, Atlanta Aircraft Certification Office, FAA, Central Region, 1669 Phoenix Parkway, Suite 210C, Atlanta, Georgia 30349.

D. An alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Atlanta Aircraft Certification Office, FAA, Central Region.

NOTE: The request should be submitted directly to the Manager, Atlanta Aircraft Certification Office, and a copy sent to the cognizant FAA Principal Maintenance Inspector (PMI), if appropriate. The PMI will then forward comments or concurrence to the Atlanta Aircraft Certification Office.

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 document (Gulfstream G-II Customer Bulletin No. 42, dated December 15, 1969) from the manufacturer may obtain copies upon request to Gulfstream Aerospace Corporation, P. O. Box 2206, M/S D-10, Savannah, Georgia 31402-9980. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, or at the FAA, Central Region, Atlanta Aircraft Certification Office, Suite 210C, 1669 Phoenix Parkway, Atlanta, Georgia.

This amendment (39-6660, AD 90-13-02) becomes effective on July 31, 1990, as to all persons, except those persons to whom it was made immediately effective by priority letter AD 90-13-02, issued June 14, 1990, which contained this amendment.