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DEPARTMENT OF TRANSPORTA nON

Federal Aviation Administration

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ACTION: Notice of proposed rulemaking (NPRM).

AGENCY: Federal Aviation Administration (FAA), DOT.

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700,70], & 702), CL-600-2D15 (Regional Jet Series 705), and CL·600-2D24 (Region

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[Docket No. FAA-WTO'-*****; Directorate Identifier 2010-NM-135-AD)

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

Jet Series 900) Airplanes

Airworthiness Directives; Bombardier, Inc. Model CL-600~2C 1a (Regional Jet Serie

RlN 2120· AA64

14 CFR Part 39

listed above. This proposed AD results from mandatory continuing airworthiness

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

[lATE

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

condition as:

There have been two reported cases of failure of the MLG [main landing

gear] piston axle, PIN [part number] 49203-3 or 49203-5, resulting from

fretting between the inboard axle sleeve and axle thrust face, damage to

the protective coating and consequent stress corrosion. In botb cases, the

MLG did not collapse.

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The unsafe condition is failure of the MLG, whicb could adversely affect the airplane'

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safe landing. The proposed AD would require actions that are intended to address the

unsafe condition described in the MCAL

FAA Form 1360-14.1 (6-89) OFFICIAL FILE COPY \~ U,S. GOVERNIAENT PRINTING OFFICE; 1995 - 769·211
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4910-13-1)1 "'R!l'~""-"'"''

ANE-171

DEPARTMENT OF TRANSPORTATION

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Federal Aviation Administration

14 CFR Part 39 LGB-AEG

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[Docket No. FAA-201O-*****; Directorate Identifier 2010-NM-135-AD] M it

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ANE·171

ANE-171 /

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RIN 2120-AA64

700.701, & 702), CL-600-2DI5 (Regional Jet Series 705), and CL·600~2D24 (Regional ".",

Jet Series 900) Airplanes

Ainvorthiness Directives; Bombardier. Inc. Model CL-600~2CI0 (Regional Jet Series

ACENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SLJMMARY: We propose to adopt a new airworthiness directive (AD) for {he products ANE·170

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IIste , db' a ave. This proposed AD results Irom mandatory continuing airworlhiness 1,'·_1_~o.~ia.',_,Q:._ ~ ~ ~ __

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information (MeAl) originated by an aviation authority of another country to identify \iJ. \ t.. \0

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

condition as: LlI II,

There have been twa reported cases offailure olthe MLG [main landing

gear] piston axle, PIN [part nLLmber]49203-3 or 49203-5, resulting from

fretting bet\'/een (he inboard axle sleeve and axle thrusl face, damage to

Ihe protective coating and consequent stress corrosion. In both cases. the

MLG did not collapse. "., '"

, , , , , ,

The unsare condition is failure of the MLG. which could adversely affect the airplane's

sare landing. The proposed AD would require actions that are intended 10 address the

unsafe condition described in the MeAL