Federal Register, Volume 75, Number 98, May 21, 2010, Pages 28463-28750 Page: 28,473
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Federal Register/Vol. 75, No. 98/Friday, May 21, 2010/Rules and Regulations
the States, on the relationship between
the national government and the States,
or on the distribution of power and
responsibilities among the various
levels of government.
For the reasons discussed above, I
certify this AD:
1. Is not a "significant regulatory
action" under Executive Order 12866;
2. Is not a "significant rule" under the
DOT Regulatory Policies and Procedures
(44 FR 11034, February 26, 1979); and
3. Will not have a significant
economic impact, positive or negative,
on a substantial number of small entities
under the criteria of the Regulatory
We prepared a regulatory evaluation
of the estimated costs to comply with
this AD and placed it in the AD docket.
Examining the AD Docket
You may examine the AD docket on
the Internet at http://
www.regulations.gov; or in person at the
Docket Operations office between 9 a.m.
and 5 p.m., Monday through Friday,
except Federal holidays. The AD docket
contains the NPRM, the regulatory
evaluation, any comments received, and
other information. The street address for
the Docket Operations office (telephone
(800) 647-5527) is in the ADDRESSES
section. Comments will be available in
the AD docket shortly after receipt.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation
safety, Incorporation by reference,
Adoption of the Amendment
a Accordingly, under the authority
delegated to me by the Administrator,
the FAA amends 14 CFR part 39 as
1. The authority citation for part 39
continues to read as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701.
* 2. The FAA amends 39.13 by
removing Amendment 39-15124 (72 FR
38004, July 12, 2007) and adding the
following new AD:
2010-10-26 Bombardier, Inc.: Amendment
39-16305. Docket No. FAA-2010-0169;
Directorate Identifier 2009-NM-102-AD.
(a) This airworthiness directive (AD)
becomes effective June 25, 2010.
(b) This AD supersedes AD 2007-14-02,
(c) This AD applies to Bombardier, Inc.
airplanes, certificated in any category,
identified in paragraphs (c)(1), (c)(2), and
(c)(3) of this AD.
(1) Model CL-600-1A11 (CL-600), serial
numbers 1004 through 1085 inclusive.
(2) Model CL-600-2A12 (CL-601), serial
numbers 3001 through 3066 inclusive.
(3) Model CL-600-2B16 (CL-601-3A, CL-
601-3R, and CL-604), serial numbers 5001
through 5194 inclusive, and serial numbers
5301 through 5665 inclusive.
(d) Air Transport Association (ATA) of
America Code 32: Landing Gear.
(e) The mandatory continuing
airworthiness information (MCAI) states:
A specific batch of nose landing gear (NLG)
and NLG door selector valves, part number
(P/N) 601R75146-1 (Kaiser Fluid
Technologies P/N 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.
Although there have been no such cases
reported on the Challenger models covered
by this directive, there have been six cases
reported on the CRJ (CL600-2B19) aircraft,
one of which resulted in the collapse of the
NLG at the departure gate.
This directive mandates a check of the
NLG and NLG door selector valves installed
on all aircraft in the Applicability section
* * *. Depending on the results;
replacement, rework and/or additional
identification of the valves may be required.
This [MCAI] revision corrects a Service
Bulletin number in the Corrective Actions
Notes: 1. The check is required whether or
not an aircraft has previously been checked
in accordance with AD CF-2006-16R1 (now
superseded and cancelled by this AD). This
is necessary since, following the issuance of
AD CF-2006-16R1, it has been determined
that the serial number (S/N) range of the
affected valves requires expansion from the
previous upper limit of S/N 0767 to S/N 2126
and the exact location of each of these
additional valves is unknown.
2. Valves that have a S/N with suffix "T"
have been manufactured by Tactair Fluid
Controls Inc. and do not require any
3. Valves manufactured by Kaiser Fluid
Technologies, P/N 750006000, with S/N 0001
through 2126, and ink stamp "SB750006000-
1", have already been checked and reworked
as necessary and do not require any
additional corrective action.
4. The Illustrated Parts Catalog, for each of
the models covered in the Applicability
section * * *, gives instructions not to
install a valve manufactured by Kaiser Fluid
Technologies, P/N 750006000, with S/N 0001
through 2126, if the marking "SB750006000-
1" is not ink stamped on the valve.
5. CL-600-2B16 (CL-605) aircraft, S/Ns
5701 and subsequent, are not affected by this
directive. They were delivered with valves,
P/N 750006000, that have either a S/N with
suffix "T" or have the ink stamp marking
(f) You are responsible for having the
actions required by this AD performed within
the compliance times specified, unless the
actions have already been done.
RESTATEMENT OF REQUIREMENTS OF
AD 2007-14-02 WITH NEW SERVICE
INFORMATION BUT NO CHANGES TO
Inspection and Corrective Action
(g) For airplanes having serial numbers (S/
Ns) as identified in the service bulletins
specified in Table 1 of this AD, as applicable:
Within 500 flight hours or 12 months after
August 16, 2007 (the effective date AD 2007-
14-02), whichever occurs first, inspect to
determine the manufacturer part numbers (P/
Ns) and serial numbers of the selector valves
of the nose landing gear (NLG) and nose gear
door. A review of airplane maintenance
records is acceptable in lieu of this
inspection if the serial numbers of the
selector valves can be conclusively
determined from that review. For any subject
selector valve having Tactair Fluid Controls
P/N 750006000 and a S/N from 0001 through
0767 inclusive, before further flight, do
related investigative (including a general
visual inspection for proper installation of
the lock wire of the end cap) and corrective
actions; in accordance with the applicable
service bulletin identified in Table 1 of this
AD. After the effective date of this AD, use
only the applicable service bulletin specified
in Table 2 of this AD.
TABLE 1-BOMBARDIER SERVICE BULLETINS
CL-600-1A 11 (C L-600) airplanes ......................................... ....................... ................
CL-600-2A12 (CL-601), and CL-600-2B16 (CL-601-3A and CL-601-3R) airplanes
service Revision- Dated-
600-0721 01 February
601-0558 01 February
TABLE l BOMBARDIER SERVICE BULLETINS
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United States. Office of the Federal Register. Federal Register, Volume 75, Number 98, May 21, 2010, Pages 28463-28750, periodical, May 21, 2010; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc52679/m1/19/: accessed January 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.