AD 89-21-02

89-21-02 BOEING: Amendment 39-6342. (Docket No. 89-NM-171-AD) Applicability: All Model 727 and Model 737-100, -200, and -200C series airplanes certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To prevent engine separation, accomplish the following:

A. Within the next 5 days after the effective date of this AD, revise the FAA-approved maintenance program to indicate that only FAA-approved engine mount cone bolt nuts specified in the table below shall be installed on the engine mount cone bolt on Boeing Models 727 and 737-100, -200, - 200C airplanes.

Boeing Model 727:

Line No. FAA-approved engine mount cone bolt nut 1 - 193 BACN10B-10L or BACN10GW-10 or NAS1804-10 or LHEB220-108 or 69-59074-1 194 - 692 LHEB220-108 or 69-59074-1 693 - 1832 69-59074-1

Boeing Model 737-100, -200, -200C:

Line No. FAA-approved engine mount cone bolt nut 1 - 124 LHEB220-108 or 69-59074-1 125 -1585 69-59074-1

No substitute shall be used for the LHEB220-108 or Boeing 69-59074-1 engine mount cone bolt nut.

B. Within 60 days after the incorporation of paragraph A., above, conduct an inspection to verify that each installed engine mount cone bolt nut conforms to the approved type design as described in paragraph A., above, and, if the 69-59074-1 is installed, verify its authenticity. If the authenticity of the engine mount cone bolt nut 69-59074-1 cannot be verified, replace it with an authentic 69-59074-1 engine mount cone bolt nut prior to further flight. The authenticity of the FAA-approved 69-59074-1 engine mount cone bolt nut is determined by the following method:

The only FAA-approved sources for the 69-59074-1 engine mount cone bolt nuts are The Boeing Company and Standard Press Steel. The authentic part markings of the engine mount cone bolt nuts are labeled on the vertical rim of the nut base at the largest diameter; nuts produced prior to 1969 may have the part marking on the sloping surface in lieu of the vertical rim. The authentic cone bolt nut is identified as "-SPS 69-59074-1-" with a single space between the "S" and "6" and absolutely no other markings.

C. Within 10 days after completion of the inspection required by paragraph B., above, for each airplane, submit a report of findings of counterfeit engine mount cone bolt nuts installed on the airplane to the Manager, Manufacturing Inspection Office, ANM-108, FAA, Transport Airplane Directorate, 17900 Pacific Highway South, C-68966, Seattle, Washington 98168. This report must include the model of the airplane inspected, the date of inspection, and the number of cycles flown since the last engine maintenance where engine mount cone bolts were installed.

NOTE: The report should be forwarded through the assigned air carrier Principal Maintenance Inspector (PMI), who will then send it to the Manager, Manufacturing Inspection Office, ANM-108.

D. An alternatemeans 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, FAA, Northwest Mountain Region.

NOTE: The request should be forwarded through an FAA Principal Maintenance Inspector (PMI), who will either concur or comment and then send it to the Manager, Seattle 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 documents from the manufacturer may obtain copies upon request to Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, or the Seattle Aircraft Certification Office, 9010 East Marginal Way South, Seattle, Washington.

This amendment (39-6342, AD 89-21-02) becomes effective on October 16, 1989.