Summary
This document proposes to adopt a new airworthiness directive (AD) that would apply to certain Cessna Aircraft Company Model 172R airplanes. The proposed action would require modifying lower forward doorpost bulkhead by installing rivets. The proposed AD is the result of a report from the manufacturer that these rivets were erroneously omitted during manufacture of some of the new production airplanes. The actions specified by the proposed AD are intended to prevent reduced structural rigidity at the forward doorpost bulkhead, which, if not corrected, could result in structural cracking and possible loss of control of the airplane.