Summary
The FAA proposes to adopt a new airworthiness directive (AD) for the airplanes listed above. For certain airplanes, this proposed AD would require inspecting to determine the airplane's cargo configuration, and reporting findings to the FAA. For airplanes modified in accordance with a certain STC or with a cargo configuration that deviates from the as-delivered configuration, this proposed AD would require revising certain manuals and manual supplements to specify certain cargo limitations. This proposed AD also would require relocating all cargo restraints on the main cargo deck. This proposed AD is prompted by reports that deficiencies related to the cargo loading system may exist on all McDonnell Douglas Model DC-9-15F airplanes modified in accordance with STC SA1993SO. We are proposing this AD to ensure that cargo in the main cabin is adequately restrained and to prevent failure of components of the cargo loading system, failure of the floor structure, or shifting of cargo. Any of these conditions could cause cargo to exceed load distribution limits or cause damage to the fuselage or control cables, which could result in reduced controllability of the airplane.