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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39 , ~ -,/_

"'OID-O,- 11.0 0-

[Docket No. FAA-:Z:OOY"-*****; Directorate Identifier 2009-NM-144-AD]

RlN 2120-AA64

Airworthiness Directives; Bombardier Model CL-600-2B19 (Regional Jet Series lOO

440) 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 product

listed above that would supersede an existing AD. This proposed AD results from

mandatory continuing airworthiness infonnation (MCAf) originated by an aviation

authority of another country to identi fy and correct an unsafe condition on an aviation

product. The MeAl describes the unsafe condition as:

Three cases of in-flight loss of cabin pressurization have been reported,

resulting from failure ofa bulkhead check valve in combination with

failure of an air supply duct.

Tn addition to mandating inspection, rework andlor replacement of l'he air

supply ducts, Airworthiness Directive (AD) CF-2003-0S (subsequently

revised to CF-2003-0SRl) [which corresponds to FAA AD 2004-22-08]

mandated the incorporation of a 4 000 flight-hour repetitive inspection

task for bulkhead check valves, Part Numbers (PIN) 92E20-3 and

92£20-4, into the approved maintenance schedule. However, this

repetitive inspection task has since been superseded by a 3000 flight~hour

periodic discard task for these bulkhead check valves.

This directive mandates revision oftlle approved maintenance schedule to

incorporate the discard task for bulkhead check valves, PIN 92E20-3 and

92E20-4, and supersedes the instructions in Corrective Actions, Part A, of

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listed above that would supersede an existing AD. This proposed AD results frum

mandatory continuing airworthiness informatiol1 (tvlCAI) or.iginated by an aviation

DEPARTMENT OF' THANSI'ORTATION

Federal Aviation Administration

14 CFR Part 39

rOod{ct No. FAA-2009-"*"'**; Dircctorate IdcntitiCI' 2009-NM-.I44-ADI

IUN 2120-AA64

Airworthincss Directives; Bombardier Model CL-600-2B 19 (Regional Jet Series 100 &

440) Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

SUMMARY: ~e pwposetoadopt a new airworthiness directive (AD) for the products

f:ilt'

allthority of another country to identily and correct an unsafe condition on an aviation

product. The MeAl describes the Unsafe condition as:

Three cascs of in-jlight Joss of (;(lbin jlfcssurizatioll have been reported_

reS\J1tillg from f~'lilureof a bulkhead check valVe in combination with

failUre of an air supply duel.

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In addition to mandating inspection, rework and/or replacement or the air

supply ducts, Airworthiness Directive (AD) CF~2003-05 (subsequently

revised to CF-2003-05RI) !.whidl corresponds lo FAA AD 2004-22-08]

mandated the im:orporution or a 4 000 fiight+hour repetitive inspection

task for bulkhead check vnlves, Part Numbers (PIN) 92E20~3 and 92E20-

4, into the approved maintenance schedule. However, this rcpctiti.ve

inspection task bas since been superseded by a 3 000 "Hight-hour periodic

discard task for these bulkhead check valves.

This directive mandates revision of (he approved maintenance schedule to

incorporate the discard lask for bulkhead check valves. PIN 92E20-3 and