## 14910-13-Pj

Federal Aviation Administration

RIN 2120-AA64

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# 1>'-1 IDocket No. FAA-2009-**"'**; Directorate Identifier 2009-NM-119-AD)

The proposed AD would require actions that are intended to address the unsafe condition information (MeAl) originated byan aviation authority ofanather country to identify listed above. This proposed AD results from mandatory continuing aif\vorthiness

Two cases of acrack on a ··dry'"ADO (Air 

### Driven Generator) (l1amilton Sundstrand pan number inthe 761339 series) inthe aft area orthe strut and generator housing assembly. have been reported on CL-600-2B I9 aircraft. The same pal1 number is also installed on CL 600-2B 16(CL-604) aircraft. Investigation determined that the crack was in an area ofthe strut where the wall thickness ofthe casting was below specification.. due to a manufacturing anomaly in a specific batch ofADOs. Structural failure and departure ofthe ADG during deployment could possibly result in damage to the aircraft structure. Ifdeployment were activated by adual engine shutdown, ADO structural failure would also result in loss of hydraulics for the flight controls. ACTION: Notice ofproposed rulemaking (NPRM). ACENCY: Federal Aviation Administration (FAA), DOT. Airworthiness Directives; Bombardier Model CL-600~2B 16(CL~604) Airplanes

and correct an unsafe condition on an aviation product. The MeAl desc-ribesthe unsafe DEPARTMENT OFTRANSPORTAnON 14CFR Part 39

SUMMARY: We propose to adopt anew airworthiness directive (AD) forthe products14910-I3-PI DEPARTMENT OF TRANSPORTAnON Federal Aviation Administration 14eFR Part 39 (Docket No. FAA-l009-H""" .••. ; Directorate Identifier 2009-NM-1l9-AD} RIN 2120-AA64 Ain\lorthiness Directivesj Bombardier Model CLw600-2B16 (CL~604) Airplanes AGENCY: FederaJ 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 byan aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MeAl describes the unsafe condition as:

Two cases of a crack on a "dry" ADO (Air Driven Generator) (Hamilton SUlldstrand part number in the 761339 series) in the

# an area of the strut and generator housing assembly, have been reported on CL-600-2B 19 aircraft. The same part number is also installed on CL 600~2B 16 (CL-604) aircraft. Investigation determined that the crack was in an area of the strut where the wall thickness orthe casting was below specification, due to a manufacturing anomaly in a specific batch of ADOs. Structural failure and departure of the ADO during deployment could possibly result in damage to the aircraft structure. Ifdeployment were activated by a dual engine shutdown, ADO structural failure would also result in loss of hydraulics for the flight controls. IW I. 'VMOOL ANE-171 j~ITT"""""S"]

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# , 11."1- The proposed AD would require actions that are intended to address the unsafe condition described in the MeAl.