Federal Register Volume 80, Number 229 (Monday, November 30, 2015)] [Proposed Rules] [Pages 74726-74729] From the Federal Register Online via the Government Publishing Office [
www.gpo.gov] [FR Doc No: 2015-30223]
DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA-2015-6541; Directorate Identifier 2015-NM-135-AD] RIN 2120-AA64 Airworthiness Directives; The Boeing Company Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). -----------------------------------------------------------------------
SUMMARY: We propose to adopt a new airworthiness directive (AD) for all The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes. This proposed AD was prompted by reports of a manufacturing oversight, in which a supplier omitted the required protective finish on certain bushings installed in the rear spar upper chord on horizontal stabilizers, which could lead to galvanic corrosion and consequent cracking of the rear spar upper chord. This proposed AD would require an inspection or records check to determine if affected horizontal stabilizers are installed, related investigative actions, and for affected horizontal stabilizers, repetitive inspections for any crack of the horizontal stabilizer rear spar upper chord, and corrective action if necessary. We are proposing this AD to detect and correct cracking of the rear spar upper chord, which can result in the failure of the upper chord and consequent departure of the horizontal stabilizer from the airplane, which can lead to loss of continued safe flight and landing.
DATES: We must receive comments on this proposed AD by January 14, 2016.
http://www.gpo.gov/fdsys/pkg/FR-2015...2015-30223.htm
Costs of Compliance We estimate that this proposed AD affects 1,397 airplanes of U.S. registry.