Airworthiness Directives; Saab AB, Saab Aerosystems Model 340A (SAAB/SF340A) and SAAB 340B Airplanes Modified in Accordance With Supplemental Type Certificate (STC) ST00224WI-D, ST00146WI-D, or SA984GL-D
airworthiness · Rule · Final rule. · Published 2011-04-20 · Effective 2011-05-25 · 76 FR 22007
Document
Document number
2011-9279
Federal Register citation
76 FR 22007
Type
Rule
Action
Final rule.
Category
airworthiness
Publication date
2011-04-20
Effective date
2011-05-25
FAA docket
Docket No. FAA-2010-0042
Abstract
We are adopting a new airworthiness directive (AD) for the products listed above. This AD requires inspecting the fuselage surface for corrosion and cracking behind the external adapter plate of the antennae installation, and repair if necessary. This AD was prompted by a report of a crack found behind the external adapter plate of the antennae during inspection. Similar cracking was found on two additional airplanes, and extensive corrosion was found on one airplane. We are issuing this AD to detect and correct corrosion and cracking behind the external adapter plate of the antennae of certain damage-tolerant structure, which could result in reduced structural integrity and consequent rapid depressurization of the airplane.