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SUMMARY: We are adopting a new airworthiness directive (AD) for the products lis

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AGENCY: Federal Aviation Administration (FAA), Department of Transportation

ACTION: Final rule; request for comments.

(DOT).

R1N 2120-AA64

Airplanes

Airworthiness Directives; Bombardier, Inc. Model BD-l 00-1 A 10 (Challenger 300)

0416

[Docket No. FAA-2010-*****; Directorate Identifier 20l0-NM-083-AD;

Amendment 39J~Z; l£2010j9 •• )/8

Federal Aviation Administration

14 CFR 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 an unsafe An

condition on an aviation product. The MeAL describes the unsafe condition as: ROUTJl<OSYMBOL

Jl<l'l1AIS/510

Investigation of a recent high altitude loss of cabin pressurization on a

BD-l OO-lAlO aircraft determined that it was caused by a partial blockage

of a safety valve cabin pressure-sensing port, in conjunction with a

dormant failure/leakage of the safety valve manometric capsule. The

blockage, caused by accumulation of lint/dust on the grid of the 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 of the safety valve. It was also determined that failure of

the manometric capsule alone would not result in tbe opening of the 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 1a (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 of a recent high altitude loss of cabin pressurization on a

BD-l 00- I A I0 aircraft determined that it was caused by a partial blockage

of a safety valve cabin pressure-sensing port, in conjunction with a

donnanl failureJleakage of the safety valve manometric capsule. Thc

blockage, caused by accumulation of lint/dust on the grid of the 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 of the safety valve. It ,"vasalso determined that failure of

the manometric capsule alone would not rcsu\[ in the opening of the safety

valve.

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

the MeAL

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