f [4910-13-P]

DEPARTMENT OF TRANSPORTATION P.,f'lJ"""~O-,

'(ll1'r"'fj ~Y""(\L

Federal Aviation Administration

14 CFR Part 39 oC\

\17 .

(Docket No. FAA-2009-r**; Directorate Identifier 2009-NM-I06-AD]

RIN 2120-AA64

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

440) Aill)!anes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM). "'j

~~~,,~n,~,~,y~"""OO;;-C--

SUMMARY: We propose to adopt a new airwortl-ulless directive (AD) for the product {ft;fJfl.J-,.-[CfO

listed above. This proposed AD results from mandatory continuing airworthiness INj\~):\",{~~\,\,,;

DoH"-

infoll11ation (MeAl) originated by an aviation authority of another country to identi fy

and con-eet an unsafe condition on an aviation product. The MeAl describes the ullsafe,.,rrt"'S"'U

condition as: ~"*~,,-,,----

A specific batch of nose landing gear (NLG) and NLG door

selector valves, part number (PIN) 601R75146-l (Kaiser Fluid

Technologies PIN 750006000), may have had their end caps

incorrectly lock-wired andlor incorrectly torqued during assembly.

This condjtion can lead to the end cap backing off, with

consequent damage to a seal and intemal leakage within the valve.

Subsequently, ir electJical power IS transferred or removed from

the aircraft before the NLG safety pin is installed, any pressure,

including reSIdua] pressure, in the NO.3 hydraulic system can

result in an uncommandcd NLG retraction and/or uncommanded

opening of the NLG doors. There have been six cases reported on

CL600-2B19 aircraft, one of which resulted in the collapse of the

NLG at the departure gate.

~,,",,;;;rl~"'G~"~''';;;'"''--

* * *

* * *
f [4910-J3-PJ

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA~2009-*****j Directorate Identifier 2009-NM-106-ADJ

RlN 2120-AA64

Ainvorthiness Directives; Bombardier Model CL-600-2B19 (Regional Jet Series 100 &

440) Airplane~

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed ruJemaking (NPRM).

I , I ,$,u

I ill

"

UTIN 'oY

ANE·I?I

INfI'lAI,"'''1l

. Gomez.

OVTl~GSY""'

ANE-171

SUMMARY: We propose to adopt a new airworthiness directive (AD) for the products

listed above. This proposed AD results from mandatory continuing airworthiness

information (MeAl) originated by an aviation authority of another country to identify

and correct an unsafe condition on an aviation product. The MeAl describes the unsafe

condition as:

A specific batch of nose landing gear (NLG) and NLG door

selector valves, part number (PIN) 601R75146-1 (Kaiser Fluid

Technologies PIN 750006000), may have had their end caps

incorrectly lock-wired and/or incorrectly torqued during assembly.

This condition can lead to the end cap backing off, with

consequent damage to a seal and internal leakage within the valve.

Subsequently, if electrical power is transferred or removed from

the aircraft before the NLG safety pin is installed, any pressure,

including residual pressure, in the NO.3 hydraulic system can

result in an uncommanded NLG retraction and/or uncoffimanded

opening of the NLG doors. There have been six C8ses reported on

CL600-2B 19 aircraft, one of which resulted in the collapse of the

N LG at the departure gate.

,"mAL!I,"';;

rJ"f :::J.e,

DAfE

'irl(,/o~

*

,

*