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SUMMARY: We are adopting anew airworthiness directive (AD) for the products lis ATl'. 

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AGENCY: Federal Aviation Administration (FAA), Department ofTransportation

ACTION: Final rule; request for comments. (DOT). R1N 2120-AA64
Airplanes Airworthiness Directives; Bombardier, Inc. Model BD-l 00-1 A10 (Challenger 300)



# 0416 [Docket No. FAA-2010-*****; Directorate Identifier 20l0-NM-083-AD; Amendment 39J~Z; l£2010j9 ••

# )/8 Federal Aviation Administration 14CFR Part 39 DEPARTMENT OF TRAi'lSPORTA nON

above. This AD results from mandatory continuing airworthiness information (MeAl) originated by an aviation authority of another country to identify and correct anunsafe An condition on an aviation product. The MeAL describes the unsafe condition as: ROUTJl<OSYMBOL

Jl<l'l1AIS/510 Investigation of arecent high altitude loss ofcabin pressurization on a BD-l OO-lAlO aircraft determined that it was caused by apartial blockage of a safety valve cabin pressure-sensing port, in conjunction with a dormant failure/leakage ofthe safety valve manometric capsule. The blockage, caused by accumulation of lint/dust on the grid ofthe port plug, did not allow sufficient airflow through the cabin pressure-sensing port to compensate for the rate of leakage from the manometric capsule, resulting in the opening ofthe safety valve. Itwas also determined that failure of the manometric capsule alone would not result in tbe opening ofthe safety valve. 

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This AD requires actions that are intended to address the unsafe condition described in 

# .~ the MCAI.[4910-13-1'1 DE.I'ARTMENT OF TlL-\NSPORTATlON Federal Aviation Administration 14 CFR l'a.-139 [Docket No. FAA-2010-*****; Di."cctoratc Identifier 2010-NM-083-AD; Amendment 39-*****; AD 2010-**-**) RIN 2120-AA64 Airworthiness Dil'cctivcs; Bombardier, Inc. ModeJ 80-100-1 A 1

## a (Challenger 300) Airplanes AG ENCY: Federal Avia/ion Administration (FAA), DCpal1mcnt of Transportation (DOT). ACTION: Final rule; request for comments. SUMMARY: We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MeAl) originated by an aviation authority or another country to identify and correct an unsafe condition on an aviation product. The MeAl describes the unsafe condition as: Investigation ofarecent high altitude loss ofcabin pressurization on a BD-l 00- IAI0 aircraft determined that itwas caused by apartial blockage of a safety valve cabin pressure-sensing port, inconjunction with a donnanl failureJleakage ofthe safety valve manometric capsule. Thc blockage, caused by accumulation oflint/dust on the grid ofthe portplug, did not allow sufficient airflow through the cabin pressure-sensing port to compensate forthe rate ofleakage from the manometric capsule, resulting inthe opening ofthe safety valve. It,"vas also determined that failure of the manometric capsule alone would not rcsu\[ inthe opening ofthe safety valve. This AD requires actions that are intended to address the unsafe condition described in the MeAL "",,-'OQ;S 

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