14 CFR Part 39

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[4910-13-P]

DEPARTMENT OF TRANSPORT AnON

Federal Aviation Administration

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[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 of proposed rulemaking (NPRM).

SUM,MARY: We propose to adopt a new airworthiness directive (AD) for the prod

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

mandatory continuing airworthiness information (MeAl) originated by an aviation

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

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product. The MeAl describes the unsafe condition as:

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

BD-IOO-IAIO 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 the opening of the safety

valve.

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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 A 10 (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 A I0 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. It was also determined that failure of

the manometric capsule alone would not result in the opening of the safety

yalve.

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AGE:'ICY: FClkral :\\'iallon "'u!lninislralioll {FA:"\). !)Cr!.

ACTIO!\': Ntllic..: llfprnros<:d rukm;lking (NPRM).

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1ll,lIld;llory continuing ;lirw1lI1I1illt,'ss in fOI'!11<1liOll{Me..\l) 'Jrigimlll'd hY;1Il ,1, j,H;lln

Inwslig<llillil Ora recl..'nt high allilut!..: loss 01'cahill pr,,:sslIri,';llil'l1 Oil il

BD-JOO-I A 10 uin:r<li'\ dl'lo.:l"ll1;ncd 1ll,Il il \\',IS C,llISl'd b~' it P,ll'tiHi bloeJ..i1g<.:

01',\ sali.:I~' ,-:II\'(: c,lbil1 pressure-sensing PUrl. iIlC\llljWH:lil1l1 \l'ilh ,I

dOI'I11<1111rail\lrc/kllbgl2 of\hc safelY \'nlv,-' JI1,lIli)IllCll'k l':lp~lIk. The

bklckagc, caused by nccull1ull1tiOI1orlinl/du:;\ Oil (he grid (>i'lilL' pelT!p!Il);.

did Ilul allo\\" suDh:knl :tirJ1ow IhrougJlIh.:: r;lhill pressllr-:-sl'[l.~illgI'llI'I \0

l'1l1l1p-:nsnt.: kH Ill.:: r;l(,.; orkak,1)O':: frOl'1 \ll..: Im\l'u!~l<.:ll'il.:cclpSlIk. n:slIlnil:;

ill lill' op"'lling \,i"lll.:: Sal,,-'\:-\"al\'l·. It Il,iS uls,~(k~o.:rlllilll'd Ill:,; I·"il!lfl.: Ill'

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