### 14CFR Part 39



# o [4910-13-P] DEPARTMENT OF TRANSPORT AnON Federal Aviation Administration



# \1-00 [Docket No. FAA-2010-*"**"; Directorate Identifier 2010-NM-136-AD] RIN 2120-AA64 Ainvorthiness Directives; Bombardier, Inc. Model BD·lOO-IAIO (Challenger 300) Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed rulemaking (NPRM). SUM,MARY: We propose to adopt anew airworthiness directive (AD) for the prod listed above that would supersede an existing AD. This proposed AD results from mandatory continuing airworthiness information (MeAl) 

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authority of another country to identify and correct an unsafe condition on an aviatio ROtmNGSYMBOL 

### product. The MeAl describes the unsafe condition as: Investigation of arecent high altitude loss ofcabin pressurization on a BD-IOO-IAIO aircraft determined that it was caused by apartial blockage of a safety valve cabin pressure-sensing port, inconjunction 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 ofleakage from the manometric capsule, resulting in the opening ofthe safety valve. It was also determined that failure of the manometric capsule alone would not result in the opening of the safety valve. '~Ti'A'-SI"(;
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### /1 I 14910-13-PI DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14eFR Part 39 IDocket No. FAA-20JO-****"'"; Directorate Identifier 2010-NM-136-ADj RIN 21Z0-AA64 Ain\'orthincss Directives; Bombardier. Inc. Model BD- J 00-1 A10 (Challenger 300) Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRJvl). SUMMARY: We propose to adopt a new airworthiness directive (AD) for the products listed above that would supersede an existing AD. This proposed AD results from mandatory continuing airworthiness information (MeAl) originated by an aviation authority of another country to identify and correcl an unsare condition on an aviation product. The 

### MeAl describes the 

### unsare condition as: Investigation o[a recent high altiLude Joss of cabin pressurization on a 8D-1 00-1 AI0 aircraft determined that it was caused 

### by a partial blockage ora safety valve cabin pressure-sensing port, in conjunction with a dormant failure/leakage of the safeLYvalve manometric capsule. The blockage, caused by accumulation of lint/dust on the grid of the port plug, did not allow sufficient airflow through the c~bin pressure-sensing port to compensate for the rate of leakage from the manometric capsule, re5ulting in the opening orlhe safety valve. Itwas also determined that failure of the manometric capsule alone would not result in the opening of the safety yalve. 

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