DEPARTMENT OF TRANSPORTATION i-";.~\,..r"",,,,; Sl'MIIOL 14 CFR Part 39 . Federal Aviation Administration



# 1/57 [Docket No. FAA-2010-*****; Directorate Identifier 201O-NM-137-ADj R1N 2120-AA64 Airworthiness Directives; Bombardier, Inc. Model DI-IC-8-102, -103, -106, -201, -20 -301, -311, -315, -401, and -402 Ai!]Jlanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed rulemaking (NPRM). SUMMARY: We propose to adopt anew ainvorthiness directive (AD) for the product listed above. This proposed AD results from mandatory continuing airworthiness information (MeAl) originated by an aviation authority of another country to identify 

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Corrosion ofthe lower windshield frames, including the anchor nuts that secure the windshield to the aircraft structure, can result in a serious structural degradation possibly leading to the loss ofthe windshield during flight. Also, water could leak inlo the cockpit and cause either a malfunction or failure of the electrical and electronics systems illthe area ofthe cockpit instrument panels. There have been several in-service reports offinding trapped water on the bottom ofthe cockpit windshield frames (or lower windshield frames) that resulted in either corrosibn or water ingress into the cockpit. In one occurrence, the trapped )vater caused severe corrosion ofnumerous anchor nuts that secure the windshield to the lower windshield frame, such that the intended fastening function was seriously compromised. [NI'IIAI ~SIG 

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IM •. n~U'lJ~~AM" A. Socias 00" ~ -sv ""'~ ANt:_170 DEPARTMENT OF TRANSPORT AnON Federal Aviation Administration 14CFR P'rt 39 IDocket No. FAA-2010-* •••• ; Director.te Ideotifier 2010-NM-137-AD) RIN 2120-AA64 Ainvorthiness Directives; Bombardier, Inc. Model Dl-IC-8Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed rulemaking (NPRM). SUMMARY: Wepropose to adopt anew airworthiness directive (AD) forthe products listed above. This proposed AD results from mandatory continuing airworthiness information (MeAl) originated byan aviation authority ofanother country to identify and Correctan unsafe condition

# do an aviation product. The MeAl describes the unsafe condition as: There have been several in-service reports offinding trapped water on the boltom ofthe cockpit wirldshield frames (or lower windshield frames) that resulted ineither corrosiof orwater ingress into the cockpit. Inone occurrence, the trapped "later caused severe corrosion ofnumerous anchor nuts that secure the windshield tothe lower windshield frame, such that the intended fastening fUllctionwas seriously compromised. Corrosion ofthe lower wlndshield frames, including the anchor nuts that secure the windshield to the aircraft structure, can result ina serious slructural degradation po~sibly leading to the loss ofthe windshield during flight. Also, water couldIleakinto thecockpit and cause either a malfunction orfailure ofthe electrical and electronics systems inthe area ofthe cockpit instrument panels. 

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