DEPARTMENT OF TRANSPORTATION

(4910-l3-_P]

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Federal Aviation Administration

14 CFR Part 39 D550

(Docket No. FAA-2010-*****; Directorate Identifier 2009-NM-124-AD]

RIN 2120-AA64

100 & 440) Airplanes; Model CL-600-2CIO (Regional Jet Series 700, 701, & 702)

Airplanes; Model CL-600-2DI5 (Regional Jet Series 705) AiIplanes; and Model

CL-600-2D24 (Regional Jet Series 900) Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

SUMlVlARY: We propose to adopt a new airworthiness directive (AD) for the product, C::./t 0 '0.

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Two cases of a crack on a "dry" ADG (aiLdriven generator] (Hamilton

Sundstrand part number in the 761339 series), in the aft area of the strut

and generator housing assembly, have been reported on CL-600-2B19

aircraft. The same part is also installed on CL-600-2ClO, -2DlS and

-2D24 aircraft. Investigation determined that the crack was in an area of

the strut where the wall thickness of the casting was below specification,

due to a manufacturing anomaly in a specific batch of ADGs. Structural

failure and departure of the ADG during deployment could possibly result

In damage to the aircraft. structure. If deployment was activated by a dual

engine shutdown, ADG structural failure would also result in loss of

hydraulics for the flight controls.

condition as:

and correct an unsafe condition on an aviation product. The MeAl describes the unsafe

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

listed above. This proposed AD results from mandatory continuing airworthiness
14910-I3-P) "()lffi"""."""_

ANE-I7I

DEPARTMENT OF TRANSPORT AnON

Federal Aviation Administration

14 CFR Part 39

(Docket No. FAA-2010-*****j Directorate Identifier 2009-NM-.124-AD)

RIN 2120-AA64

"'.".l1lllGsn

ANE-171

Ainvorthiness Directives; Bombardier, Inc. Model CL-600-2B 19 (Regional Jet Series

100 & 440) Airplanes; Model CL-600-2CIO (Regional Jet Series 700, 701 & 702)

Airplanes; Model CL-600-2D15 (Regional Jet Series 705) Airplanes; and Model

CL-600-2D24 (Regional Jet Series 900) 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 byan aviation authority of another country to identify

and correct an unsafe condition on an aviation product. The MCAI describes the unsafe

condition as:

Two cases of a crack all a "dry" ADG (HamiJton Sundstrand part number

in the 761339 series), in the aft area of the strut and generator housing

assembly, have been reported on CL-600-2BI 9 aircraft. The same part is

also installed on CL-600-2C IO. -2D 15 and -2D24 aircraft. Investigation

determined that the crack was in an area of the strut where the wall

thickness of the casting was below specification, due to a manufacturing

anomaly in a specific batch of ADGs. Structural failure and departure of

the ADG during deployment could possibly result in damage to the

aircraft structure. If deployment was activated by a dual engine shutdown,

ADG structural failure would also result in loss of hydraulics for the flight

controls.

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ANE-170

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