AD 90-16-51 R1

90-16-51 R1 MCDONNELL DOUGLAS: Amendment 39-6710. Final rule of and revision to T90-16-51, as corrected. Docket No. 90-NM-162-AD.

Applicability: Model DC-9-10, DC-9-30, and C-9 (military) series airplanes, equipped with a forward upper cargo door, certificated in any category.

Compliance: Required within 14 calendar days after the effective date of this amendment, unless previously accomplished.

To prevent inadvertent opening of the main cargo door during flight, accomplish the following:

A. Except as provided in paragraph B. of this AD, perform a torque test on the cargo door latch spool fitting attach bolts, in accordance with the instructions for Group 1, Phase 1, of McDonnell Douglas DC-9 Service Bulletin 52-119, Revision 1, dated January 30, 1981.

NOTE: The requirements of this AD are applicable to all Model DC-9-10, DC-9-30, and C-9 (military) series airplanes equipped with a forward upper cargo door, regardless of the effectivity as specified inthe McDonnell Douglas DC-9 service bulletin.

1. If a bolt breaks, prior to further flight, replace it with a new bolt and seal in accordance with Figure 1 of the service bulletin.

2. If a bolt passes the torque test, prior to further flight, retorque the bolt and seal in accordance with the instructions for Group 1, Phase 1, of the service bulletin.

B. The test required by paragraph A. of this AD is not required for Inconel bolts, part numbers RA21026-7-28, 77711-7-28 and 3D0031-7-28.

C. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes unpressurized to a base for the accomplishment of the requirements of this AD.

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, Los Angeles Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate.

NOTE: The request should be submitted directlyto the Manager, Los Angeles ACO, and a copy sent to the cognizant FAA Principal Inspector (PI). The PI will then forward comments or concurrence to the Los Angeles ACO.

All persons affected by this directive who have not already received the appropriate service documents from the manufacturer, may obtain copies upon request to McDonnell Douglas Corporation, P.O. Box 1771, Long Beach, California 90846-0001, Attention: Business Unit Manager, Technical Publications, C1-HCW (54-60). These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue S.W., Renton, Washington, or the Los Angeles Aircraft Certification Office, 3229 East Spring Street, Long Beach, California.

Portions of this amendment were effective earlier to recipients of telegraphic AD T90-16-51, issued on August 3, 1990, and a correction to that AD issued on August 7, 1990.

This amendment (39-6710, AD 90-16-51 R1) becomes effective on September 10, 1990.