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14 CFR Part 39 .

Federal Aviation Administration

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[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 of proposed rulemaking (NPRM).

SUMMARY: We propose to adopt a new 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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and correct an unsafe condition on an aviation product. The MeAl describes the unsafe INITIAl.SiS'(;

condition as:

Corrosion of the 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 of the windshield during

flight. Also, water could leak inlo the cockpit and cause either a

malfunction or failure of the electrical and electronics systems ill the area

of the cockpit instrument panels.

There have been several in-service reports of finding trapped water on the

bottom of the 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 of numerous anchor

nuts that secure the windshield to the lower windshield frame, such that

the intended fastening function was seriously compromised.

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DEPARTMENT OF TRANSPORT AnON

Federal Aviation Administration

14 CFR P'rt 39

IDocket No. FAA-2010-* •••• ; Director.te Ideotifier 2010-NM-137-AD)

RIN 2120-AA64

Ainvorthiness Directives; Bombardier, Inc. Model Dl-IC-8 Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

SUMMARY: We propose to adopt a new airworthiness directive (AD) for the products

listed above. This proposed AD results from mandatory continuing airworthiness

information (MeAl) originated by an aviation authority of another country to identify

and Correct an unsafe condition do an aviation product. The MeAl describes the unsafe

condition as:

There have been several in-service reports of finding trapped water on the

boltom of the cockpit wirldshield frames (or lower windshield frames) that

resulted in either corrosiof or water ingress into the cockpit. In one

occurrence, the trapped "later caused severe corrosion of numerous anchor

nuts that secure the windshield to the lower windshield frame, such that

the intended fastening fUllctionwas seriously compromised.

Corrosion of the lower wlndshield frames, including the anchor nuts that

secure the windshield to the aircraft structure, can result in a serious

slructural degradation po~sibly leading to the loss of the windshield during

flight. Also, water could Ileak into the cockpit and cause either a

malfunction or failure ofthe electrical and electronics systems in the area

of the cockpit instrument panels.

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