The bulletin
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FAA Aircraft Certification Service
SPECIAL AIRWORTHINESS
INFORMATION BULLETIN http://www.faa.gov/aircraft/safety/alerts/SAIB
SAIB: CE-07-18 Date: March 14, 2007 This is information only. Recommendations aren’t mandatory.
Introduction
This Special Airworthiness Information Bulletin (SAIB) informs you, a registered owner and/or operator of Raytheon Aircraft Company Models, T-34A, T-34B, L-23B, 45, 35, 95, A95, B95, B95-A, 95-55, and 95B55 airplanes with production parts that may have escaped the Raytheon Aircraft Company Quality Control System with potential problems as noted.
Background
The parts are typically hinge halves for various control surfaces. Figures 1, 2, and 3 show the typical parts and assemblies and where the forming thinning, necking, and cracking are occurring. Parts, other than those shown in the figures, which may exhibit these production flaws are:
• 35-650120-2
• 35-650120-7002
• 35-650122-2
• 45-640005-39
• 35-650120-7002
• 45-640005-43
• 95-620010-60
Recommendation
The FAA recommends that owners and operators inspect the elevator and rudder control surface hinge halves for proper part forming if parts were replaced after February of 2001. Figures 1, 2, & 3 show examples of incorrectly formed hinge halves. These examples exhibit thinning, necking, and possible cracking. If hinge halves are found with theses forming deformities, then the hinge halve or hinge assembly needs to be replaced. The manufacture has not issued any service information on this condition.
For Further Information Contact
Steven Potter, Aerospace Engineer, FAA Wichita ACO, 1801 Airport Road, Room 100, Wichita, KS 67209, telephone: (316) 946-4124, fax: (316) 946-4407, e-mail: steven.potter@faa.gov
Figure 1. Hinge Half and Hinge Assembly
Figure 2. Hinge Assembly and Hinge Half
Figure 3. Hinge Half with forming crack
35-650121-4 Hinge Assembly Formed Correctly 35-650121-2 Hinge Half Formed Incorrectly Forming Crack Correctly Formed Incorrectly Formed Forming Crack
Incorrectly Formed Hinge Half Forming Crack
Registered aircraft it may concern
Registry models matched by Raytheon 35, 45 (Military YT-34), 50 and 7 more, the same way as ADs, with the most registered aircraft first.