```

[Federal Register Volume 76, Number 45 (Tuesday, March 8, 2011)]
[Proposed Rules]
[Pages 12629-12634]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2011-5161]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2011-0151; Directorate Identifier 2009-NM-205-AD]
RIN 2120-AA64

Airworthiness Directives; Bombardier, Inc. Model DHC-8-400 Series 
Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

-----------------------------------------------------------------------

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 
(MCAI) originated by an aviation authority of another country to 
identify and correct an unsafe condition on an aviation product. The 
MCAI describes the unsafe condition as:

    Two cases of main landing gear collapse had been reported. Main 
landing gear collapse may result in unsafe landing of the aircraft.
* * * * *

    The proposed AD would require actions that are intended to address 
the unsafe condition described in the MCAI.

DATES: We must receive comments on this proposed AD by April 22, 2011.

ADDRESSES: You may send comments by any of the following methods:
     Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for submitting comments.
     Fax: (202) 493-2251.
     Mail: U.S. Department of Transportation, Docket 
Operations,

[[Page 12630]]

M-30, West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue, 
SE., Washington, DC 20590.
     Hand Delivery: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-40, 1200 New 
Jersey Avenue, SE., Washington, DC, between 9 a.m. and 5 p.m., Monday 
through Friday, except Federal holidays.
    For service information identified in this proposed AD, contact 
Bombardier, Inc., Q-Series Technical Help Desk, 123 Garratt Boulevard, 
Toronto, Ontario M3K 1Y5, Canada; telephone 416-375-4000; fax 416-375-
4539; e-mail thd.qseries@aero.bombardier.com; Internet http://www.bombardier.com. You may review copies of the referenced service 
information at the FAA, Transport Airplane Directorate, 1601 Lind 
Avenue SW., Renton, Washington. For information on the availability of 
this material at the FAA, call 425-227-1221.

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 this proposed AD, 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.

FOR FURTHER INFORMATION CONTACT: Craig Yates, Aerospace Engineer, 
Airframe and Mechanical Systems Branch, ANE-171, FAA, New York Aircraft 
Certification Office (ACO), 1600 Stewart Avenue, Suite 410, Westbury, 
New York 11590; telephone (516) 228-7355; fax (516) 794-5531.

SUPPLEMENTARY INFORMATION:

Comments Invited

    We invite you to send any written relevant data, views, or 
arguments about this proposed AD. Send your comments to an address 
listed under the ADDRESSES section. Include ``Docket No. FAA-2011-0151; 
Directorate Identifier 2009-NM-205-AD'' at the beginning of your 
comments. We specifically invite comments on the overall regulatory, 
economic, environmental, and energy aspects of this proposed AD. We 
will consider all comments received by the closing date and may amend 
this proposed AD based on those comments.
    We will post all comments we receive, without change, to http://www.regulations.gov, including any personal information you provide. We 
will also post a report summarizing each substantive verbal contact we 
receive about this proposed AD.

Discussion

    On October 19, 2007, we issued AD 2007-22-09, Amendment 39-15245 
(72 FR 61288, October 30, 2007). That AD required actions intended to 
address an unsafe condition on the products listed above.
    Since we issued AD 2007-22-09, Transport Canada Civil Aviation 
(TCCA), which is the aviation authority for Canada, has issued Canadian 
Airworthiness Directive CF-2007-20R2, dated February 6, 2009 (referred 
to after this as ``the MCAI''), to correct an unsafe condition for the 
specified products. The MCAI states:

    Two cases of main landing gear collapse had been reported. Main 
landing gear collapse may result in unsafe landing of the aircraft.
    Revision 1 of this directive amended the time compliance in 
paragraph C.2 (3 months in addition to 500 hours air time), to add 
new paragraph C.3 to cater for retract actuator which has 
accumulated less than 4,000 landings or 2 years since new and to add 
new paragraphs B.2 and C.4 to require that the respective 
inspections be repetitively performed until terminating action 
becomes available.
    Revision 2 of this directive amends the detailed visual 
inspection requirement in paragraph C.3 to include the main landing 
gear retract actuator, part number 46550-11, and to add new 
paragraph F to mandate the incorporation of main landing gear 
retract actuator part number, 46550-13 as the terminating action and 
to add new paragraph G for the maintenance requirement.

    You may obtain further information by examining the MCAI in the AD 
docket.

Relevant Service Information

    Bombardier has issued Service Bulletin 84-32-55, Revision A, dated 
March 10, 2008; and Repair Drawing 8/4-32-059, Issue 7, dated June 26, 
2008. Bombardier has also issued Temporary Revision (TR) MRB-35, dated 
November 18, 2008, to Section 1-32 of Part 1 of the Bombardier Q400 
Dash 8 Maintenance Requirements Manual (PSM 1-84-7). The actions 
described in this service information are intended to correct the 
unsafe condition identified in the MCAI.

FAA's Determination and Requirements of This Proposed AD

    This product has been approved by the aviation authority of another 
country, and is approved for operation in the United States. Pursuant 
to our bilateral agreement with the State of Design Authority, we have 
been notified of the unsafe condition described in the MCAI and service 
information referenced above. We are proposing this AD because we 
evaluated all pertinent information and determined an unsafe condition 
exists and is likely to exist or develop on other products of the same 
type design.

Changes to AD 2007-22-09

    This proposed AD would retain certain requirements of AD 2007-22-
09. Since AD 2007-22-09 was issued, the AD format has been revised, and 
certain paragraphs have been rearranged. As a result, the corresponding 
paragraph identifiers have changed in this proposed AD, as listed in 
the following table:

                      Revised Paragraph Identifiers
------------------------------------------------------------------------
                                      Corresponding requirement in this
    Requirement in AD 2007-22-09                 proposed AD
------------------------------------------------------------------------
             paragraph (f)                       paragraph (g).
             paragraph (g)                       paragraph (h).
             paragraph (h)                       paragraph (i).
             paragraph (i)                       paragraph (j).
             paragraph (j)                       paragraph (k).
             paragraph (l)                    paragraph (v)(3).
------------------------------------------------------------------------

    We have revised paragraph (f) of AD 2007-22-09 to remove reference 
to Tasks Z700-03E and Z700-04E specified in Part 1 (Maintenance Review 
Board Report) of the Bombardier DHC-8 Series 400 Maintenance 
Requirements Manual (PSM 1-84-7). Instead, we have added Note 3 to this 
AD to specify that guidance on doing a general visual inspection to 
detect discrepancies of the left- and right-hand main landing gear 
system can be found in Tasks Z700-03E and Z700-04E of Part 1 
(Maintenance Review Board Report) of the Bombardier DHC-8 Series 400 
Maintenance Requirements Manual (PSM 1-84-7).

Change to Applicability of AD 2007-22-09

    AD 2007-22-09 applies to airplanes having serial numbers (S/Ns) 003 
and subsequent, which now corresponds to S/Ns 4003 and subsequent. This 
proposed AD applies to S/Ns 4003, 4004, 4006, and 4008 through 4208 
inclusive, and also adds S/N 4001. The airplanes having serial numbers 
other than those specified in the Applicability of this proposed AD are 
not affected by the identified unsafe condition.

Differences Between This AD and the MCAI or Service Information

    We have reviewed the MCAI and related service information and, in

[[Page 12631]]

general, agree with their substance. But we might have found it 
necessary to use different words from those in the MCAI to ensure the 
AD is clear for U.S. operators and is enforceable. In making these 
changes, we do not intend to differ substantively from the information 
provided in the MCAI and related service information.
    We might also have proposed different actions in this AD from those 
in the MCAI in order to follow FAA policies. Any such differences are 
highlighted in a Note within the proposed AD.

Costs of Compliance

    Based on the service information, we estimate that this proposed AD 
would affect about 55 products of U.S. registry.
    The actions that are required by AD 2007-22-09 and retained in this 
proposed AD take about 5 work-hours per product, at an average labor 
rate of $85 per work hour. Based on these figures, the estimated cost 
of the currently required actions is $425 per product.
    We estimate that it would take about 8 work-hours per product to 
comply with the new basic requirements of this proposed AD. The average 
labor rate is $85 per work-hour. Required parts would cost about 
$27,511 per product. Where the service information lists required parts 
costs that are covered under warranty, we have assumed that there will 
be no charge for these costs. As we do not control warranty coverage 
for affected parties, some parties may incur costs higher than 
estimated here. Based on these figures, we estimate the cost of the 
proposed AD on U.S. operators to be $1,550,505, or $28,191 per product.

Authority for This Rulemaking

    Title 49 of the United States Code specifies the FAA's authority to 
issue rules on aviation safety. Subtitle I, section 106, describes the 
authority of the FAA Administrator. ``Subtitle VII: Aviation 
Programs,'' describes in more detail the scope of the Agency's 
authority.
    We are issuing this rulemaking under the authority described in 
``Subtitle VII, Part A, Subpart III, Section 44701: General 
requirements.'' Under that section, Congress charges the FAA with 
promoting safe flight of civil aircraft in air commerce by prescribing 
regulations for practices, methods, and procedures the Administrator 
finds necessary for safety in air commerce. This regulation is within 
the scope of that authority because it addresses an unsafe condition 
that is likely to exist or develop on products identified in this 
rulemaking action.

Regulatory Findings

    We determined that this proposed AD would not have federalism 
implications under Executive Order 13132. This proposed AD would not 
have a substantial direct effect on 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 proposed 
regulation:
    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 Flexibility Act.
    We prepared a regulatory evaluation of the estimated costs to 
comply with this proposed AD and placed it in the AD docket.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

The Proposed Amendment

    Accordingly, under the authority delegated to me by the 
Administrator, the FAA proposes to amend 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

    1. The authority citation for part 39 continues to read as follows:

    Authority: 49 U.S.C. 106(g), 40113, 44701.

Sec.  39.13  [Amended]

    2. The FAA amends Sec.  39.13 by removing Amendment 39-15245 (72 FR 
61288, October 30, 2007) and adding the following new AD:

Bombardier, Inc.: Docket No. FAA-2011-0151; Directorate Identifier 
2009-NM-205-AD.

Comments Due Date

    (a) We must receive comments by April 22, 2011.

Affected ADs

    (b) The AD supersedes AD 2007-22-09, Amendment 39-15245.

Applicability

    (c) This AD applies to Bombardier, Inc. Model DHC-8-400, -401, 
and -402 airplanes, certificated in any category, having serial 
numbers (S/Ns) 4001, 4003, 4004, 4006, and 4008 through 4208 
inclusive.

Subject

    (d) Air Transport Association (ATA) of America Code 32: Landing 
Gear.

Reason

    (e) The mandatory continuing airworthiness information (MCAI) 
states:
    Two cases of main landing gear collapse had been reported. Main 
landing gear collapse may result in unsafe landing of the aircraft.
* * * * *

Compliance

    (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 AD 2007-22-09, With Updated Service Information, Limited 
Affected Airplanes, and Revised Compliance Times

General Visual Inspection of Main Landing Gear (MLG) System, and 
Corrective Actions

    (g) For airplanes having S/Ns 003, 004, 006, and 008 through 182 
inclusive (now referred to as S/Ns 4003, 4004, 4006, and 4008 
through 4182 inclusive), before further flight, do a general visual 
inspection to detect discrepancies of the left- and right-hand MLG 
system and do all applicable corrective actions, in accordance with 
a method approved by the Manager, New York Aircraft Certification 
Office (ACO), FAA; or Transport Canada Civil Aviation (TCCA) (or its 
delegated agent).

    Note 1: For the purposes of this AD, a general visual inspection 
is: ``A visual examination of an interior or exterior area, 
installation, or assembly to detect obvious damage, failure, or 
irregularity. This level of inspection is made from within touching 
distance unless otherwise specified. A mirror may be necessary to 
ensure visual access to all surfaces in the inspection area. This 
level of inspection is made under normally available lighting 
conditions such as daylight, hangar lighting, flashlight, or 
droplight and may require removal or opening of access panels or 
doors. Stands, ladders, or platforms may be required to gain 
proximity to the area being checked.''

    Note 2: Guidance on doing a general visual inspection to detect 
discrepancies of the left- and right-hand MLG system can be found in 
Tasks Z700-03E and Z700-04E of Part 1 (Maintenance Review Board 
Report) of the Bombardier DHC-8 Series 400 Maintenance Requirements 
Manual (PSM 1-84-7).

General Visual Inspection of the Jam Nut of the Retract Actuator of the 
MLG and Corrective Actions

    (h) For all airplanes except for the airplane having serial 
number 4001: Before further flight, do a general visual inspection 
of the jam nut of the retract actuator of the left- and right-hand 
MLG to ensure the wire lock is in place and the nut is secured. If 
the wire lock is not in place or if the jam nut is not secured, 
before further flight, adjust the retracted length of the rod end, 
torque the jam nut, install a wire lock, and lubricate the piston, 
as applicable, in accordance with

[[Page 12632]]

Bombardier Repair Drawing (RD) 8/4-32-059, Issue 4, dated September 
14, 2007; or Issue 7, dated June 26, 2008. As of the effective date 
of this AD, use only Bombardier RD 8/4-32-059, Issue 7, dated June 
26, 2008. Doing the revision required by paragraph (r) of this AD 
terminates the inspection required by this paragraph.

    Note 3: Bombardier RD 8/4-32-059, Issue 4, dated September 14, 
2007, refers to Goodrich Service Concession Request SCR 086-07, 
Revision C, dated September 14, 2007 (specifically item 14); and 
Bombardier RD 8/4-32-059, Issue 7, dated June 26, 2008, refers to 
Goodrich Service Concession Request SCR 086-07, Revision F, dated 
June 13, 2008 (specifically item 14); as an additional source of 
service information for adjusting the retracted length of the rod 
end, torquing the jam nut, installing a wire lock, and lubricating 
the piston if necessary, as required by paragraph (h) of this AD.

Detailed Inspection of the Retract Actuator of the MLG, With Extended 
Compliance Time for Paragraph (j) of This AD

    (i) For airplanes having S/Ns 003, 004, 006, and 008 through 182 
inclusive (now referred to as S/Ns 4003, 4004, 4006, and 4008 
through 4182 inclusive) on which the retract actuator of the MLG, P/
N 46550-7 or 46550-9, has accumulated 8,000 or more total landings 
or has been in-service 4 or more years since new, as of November 14, 
2007 (the effective date of 2007-22-09): Before further flight, do a 
detailed inspection of affected parts for any signs of corrosion or 
wear, and applicable related investigative and corrective actions, 
in accordance with Bombardier RD 8/4-32-059, Issue 4, dated 
September 14, 2007; or Issue 7, dated June 26, 2008. As of the 
effective date of this AD, use only Bombardier RD 8/4-32-059, Issue 
7, dated June 26, 2008.

    Note 4: For the purposes of this AD, a detailed inspection is: 
``An intensive examination of a specific item, installation, or 
assembly to detect damage, failure, or irregularity. Available 
lighting is normally supplemented with a direct source of good 
lighting at an intensity deemed appropriate. Inspection aids such as 
mirror, magnifying lenses, etc., may be necessary. Surface cleaning 
and elaborate procedures may be required.''

    (j) For airplanes having S/Ns 003, 004, 006, and 008 through 182 
inclusive (now referred to as S/Ns 4003, 4004, 4006, and 4008 
through 4182 inclusive) with a retract actuator of the MLG, P/N 
46550-7 or 46550-9, other than those identified in paragraph (i) of 
this AD: Do a detailed inspection of affected parts for any signs of 
corrosion or wear, and applicable related investigative and 
corrective actions, in accordance with Bombardier RD 8/4-32-059, 
Issue 4, dated September 14, 2007; or Issue 7, dated June 26, 2008; 
at the later of the times specified in paragraphs (j)(1) and (j)(2) 
of this AD. As of the effective date of this AD, use only Bombardier 
RD 8/4-32-059, Issue 7, dated June 26, 2008.
    (1) Before the accumulation of 4,500 total landings or 27 months 
since new, whichever occurs first.
    (2) Within 500 flight hours after November 14, 2007, or within 3 
months after the effective date of this AD, whichever occurs first.

    Note 5: Bombardier RD 8/4-32-059, Issue 7, dated June 26, 2008, 
refers to Goodrich Service Concession Request SCR 086-07, Revision 
F, dated June 13, 2008, as an additional source of service 
information for accomplishing the applicable related investigative 
and corrective actions required by paragraphs (i) and (j) of this 
AD.

Actions Done in Accordance With Previous Issues of Service Information

    (k) Actions done before November 14, 2007, in accordance with 
repair drawings specified in Table 1 of this AD, are acceptable for 
compliance with the corresponding actions specified in paragraphs 
(h) through (j) of this AD.

                    Table 1--Previous Repair Drawings
------------------------------------------------------------------------
           Document             Issue                 Date
------------------------------------------------------------------------
Bombardier Repair Drawing 8/4-       1  September 12, 2007.
 32-059.
Bombardier Repair Drawing 8/4-       2  September 13, 2007.
 32-059.
Bombardier Repair Drawing 8/4-       3  September 13, 2007.
 32-059.
------------------------------------------------------------------------

New Requirements of this AD

General Visual Inspection of the Jam Nut of the Retract Actuator of 
the MLG, and Corrective Actions

    (l) For all airplanes: At the later of the times specified in 
paragraphs (l)(1) and (l)(2) of this AD, do a general visual 
inspection of the left- and right-hand MLG retract actuator jam nut 
to ensure that the wire lock is in place and that the nut is secure, 
in accordance with a method approved by the Manager, New York 
Aircraft Certification Office (ACO), FAA; or Transport Canada Civil 
Aviation (TCCA) (or its delegated agent). If the wire lock is not in 
place or the jam nut is not secured, before further flight, re-
torque the jam nut and safety lockwire, in accordance with 
Bombardier RD 8/4-32-059, Issue 7, dated June 26, 2008. Repeat the 
inspection thereafter at intervals not to exceed 250 flight cycles 
or 30 days, whichever occurs first. Doing the revision required by 
paragraph (r) of this AD terminates the inspections required by this 
paragraph.
    (1) Within 250 flight cycles or 30 days after accomplishing the 
inspection required by paragraph (h) of this AD, whichever occurs 
first.
    (2) Within 7 days after the effective date of this AD.

    Note 6:  Guidance for doing a general visual inspection to 
detect discrepancies of the left- and right-hand MLG system can be 
found in Tasks Z700-03E and Z700-04E of Part 1 (Maintenance Review 
Board Report) of the Bombardier DHC-8 Series 400 Maintenance 
Requirements Manual (PSM 1-84-7).

Detailed Inspection of the Retract Actuator of the MLG, and Related 
Investigative and Corrective Actions

    (m) For airplanes equipped with a MLG retract actuator having P/
N 46550-7 or 46550-9: At the later of the times specified in 
paragraphs (m)(1) and (m)(2) of this AD, do a detailed inspection of 
affected parts for any signs of corrosion or wear, and do applicable 
related investigative and corrective actions, in accordance with 
Bombardier RD 8/4-32-059, Issue 7, dated June 26, 2008. Do all 
applicable related investigative and corrective actions before 
further flight. Repeat the inspection thereafter at intervals not to 
exceed 2,000 flight cycles or 12 months, whichever occurs first.
    (1) Within 2,000 flight cycles or within 12 months after 
accomplishing the inspection required by paragraph (i) or (j) of 
this AD, whichever occurs first.
    (2) Within 30 days after the effective date of this AD.
    (n) For airplanes having serial numbers 4001, 4003, 4004, 4006, 
and 4008 through 4182 inclusive equipped with a MLG retract actuator 
having P/N 46550-11: At the later of the times specified in 
paragraphs (n)(1) and (n)(2) of this AD, do a detailed inspection of 
affected parts for any signs of corrosion or wear, and applicable 
related investigative and corrective actions, in accordance with 
Bombardier RD 8/4-32-059, Issue 7, dated June 26, 2008. Do all 
applicable related investigative and corrective actions before 
further flight. Repeat the inspection thereafter at intervals not to 
exceed 2,000 flight cycles or 12 months, whichever occurs first.
    (1) Before the accumulation of 4,500 total landings or 27 months 
since new, whichever occurs first.
    (2) Within 500 flight hours or 3 months after the effective date 
of this AD, whichever occurs first.
    (o) For airplanes having serial numbers 4001, 4003, 4004, 4006, 
and 4008 through 4182 inclusive equipped with a MLG retract actuator 
having P/N 46550-7, P/N 46550-9, or P/N 46550-11, and that have 
accumulated 7,500 total flight cycles or more as of the effective 
date of this AD, or that have more than 48 months since new: Within 
500 flight cycles or 3 months after the effective date of this AD, 
whichever occurs first, replace the affected retract actuator with a 
new design

[[Page 12633]]

retract actuator having P/N 46550-13, in accordance with Bombardier 
Service Bulletin 84-32-55, Revision A, dated March 10, 2008 
(Bombardier Modsum 4-901603). Doing the replacement specified in 
this paragraph terminates the requirements of paragraphs (i), (j), 
(m), and (n) of this AD.
    (p) For airplanes having serial numbers 4001, 4003, 4004, 4006, 
and 4008 through 4182 inclusive equipped with MLG retract actuators 
having P/N 46550-7, P/N 46550-9, or P/N 46550-11, that have 
accumulated less than 7,500 total flight cycles as of the effective 
date of this AD and that have 48 months or less since new: Prior to 
the accumulation of 8,000 total flight cycles, or within 51 months 
since new, whichever occurs first, replace the affected retract 
actuator with a new design retract actuator having P/N 46550-13, in 
accordance with Bombardier Service Bulletin 84-32-55, Revision A, 
dated March 10, 2008 (Bombardier Modsum 4-901603). Doing the 
replacement specified in this paragraph terminates the requirements 
of paragraphs (i), (j), (m), and (n) of this AD.
    (q) Replacing the affected retract actuator with a new design 
retract actuator having P/N 46550-15, in accordance with the 
Accomplishment Instructions of Bombardier Service Bulletin 84-32-60, 
Revision A, dated September 29, 2008 (Bombardier Modsum 4-901610), 
is also acceptable for compliance with the requirements of 
paragraphs (o) and (p) of this AD.

Revision of the Maintenance Program

    (r) For all airplanes: Within 30 days after the effective date 
of this AD, revise the maintenance program by incorporating Task 
320100-211 (repetitive detailed inspections of the retraction 
actuator rod end jam nut, gland nut, and actuator attachment pins 
for condition, the security of installation, and corrosion) and Task 
320100-212 (repetitive restorations of the retraction actuator for 
complete overhaul), as specified in Bombardier Temporary Revision 
(TR) MRB-35, dated November 18, 2008, to the Bombardier Q400 Dash 8 
Maintenance Requirements Manual (PSM 1-84-7). Doing this revision 
terminates the requirements of paragraphs (h) and (l) of this AD. 
The initial compliance times for doing Task 320100-211 and Task 
320100-212 are specified in paragraphs (r)(1) and (r)(2) of this AD. 
After doing this revision, no alternative inspections, restorations, 
or intervals may be used, unless the inspections, restorations, or 
intervals are approved as an alternative method of compliance (AMOC) 
in accordance with the procedures specified in paragraph (v)(1) of 
this AD.
    (1) For Task 320100-211 in Bombardier TR MRB-35, dated November 
18, 2008, to the Bombardier Q400 Dash 8 Maintenance Requirements 
Manual (PSM 1-84-7): The compliance time for the initial inspection 
is within 600 flight hours after the effective date of this AD.
    (2) For Task 320100-212 in Bombardier TR MRB-35, dated November 
18, 2008, to the Bombardier Q400 Dash 8 Maintenance Requirements 
Manual (PSM 1-84-7): The compliance time for the initial restoration 
is the later of the times of paragraphs (r)(2)(i) and (r)(2)(ii) of 
this AD.
    (i) Prior to the accumulation of 25,000 total flight cycles, or 
within 12 years since the date of issuance of the original 
airworthiness certificate or the date of issuance of the original 
export certificate of airworthiness, whichever occurs first.
    (ii) Within 500 flight cycles after the effective date of this 
AD.

    Note 7: The actions required by paragraph (r) of this AD may be 
done by inserting copies of Bombardier TR MRB-35, dated November 18, 
2008, into the Bombardier Q400 Dash 8 Maintenance Requirements 
Manual (PSM 1-84-7). When this TR has been included in general 
revisions of the PSM, the general revisions may be inserted in the 
PSM, provided the relevant information in the general revision is 
identical to that in Bombardier TR MRB-35, dated November 18, 2008.

Credit for Actions Accomplished in Accordance With Previous Service 
Information

    (s) Doing a general visual inspection of the jam nut of the 
retract actuator of the left- and right-hand MLG; and doing a 
detailed inspection of affected parts for any signs of corrosion or 
wear, and applicable related investigative and corrective actions; 
is also acceptable for compliance with the corresponding 
requirements of paragraphs (h), (i), (j), (l), (m), and (n) of this 
AD, if done before the effective date of this AD in accordance with 
Bombardier Repair Drawing 8/4-32-059, Issue 5, dated September 20, 
2007; or Bombardier Repair Drawing 8/4-32-059, Issue 6, dated 
January 31, 2008.
    (t) Replacing the affected retract actuator with a new design 
retract actuator having P/N 46550-13 is also acceptable for 
compliance with the requirements of paragraphs (o) and (p) of this 
AD, if done before the effective date of this AD in accordance with 
Bombardier Service Bulletin 84-32-55, dated January 14, 2008 (Modsum 
4-901603).

No Reporting

    (u) While Canadian Airworthiness Directive CF-2007-20R2, dated 
February 6, 2009, has a reporting action, this AD does not require 
reporting.

FAA AD Differences

    Note 8:  This AD differs from the MCAI and/or service 
information as follows: Although the MCAI or service information 
tells you to submit information to the manufacturer, paragraph (u) 
of this AD specifies that such submittal is not required.

Other FAA AD Provisions

    (v) The following provisions also apply to this AD:
    (1) Alternative Methods of Compliance (AMOCs): The Manager, New 
York Aircraft Certification Office (ACO), ANE-170, FAA, has the 
authority to approve AMOCs for this AD, if requested using the 
procedures found in 14 CFR 39.19. Send information to ATTN: Program 
Manager, Continuing Operational Safety, FAA, New York ACO, 1600 
Stewart Avenue, Suite 410, Westbury, New York, 11590; telephone 516-
228-7300; fax 516-794-5531. Before using any approved AMOC on any 
airplane to which the AMOC applies, notify your principal 
maintenance inspector (PMI) or principal avionics inspector (PAI), 
as appropriate, or lacking a principal inspector, your local Flight 
Standards District Office. The AMOC approval letter must 
specifically reference this AD. AMOCs approved previously in 
accordance with AD 2007-22-09, Amendment 39-15245, are approved as 
AMOCs for the corresponding provisions of paragraph (i) and (j) of 
this AD.
    (2) Airworthy Product: For any requirement in this AD to obtain 
corrective actions from a manufacturer or other source, use these 
actions if they are FAA-approved. Corrective actions are considered 
FAA-approved if they are approved by the State of Design Authority 
(or their delegated agent). You are required to assure the product 
is airworthy before it is returned to service.
    (3) Special Flight Permits: Special flight permits may be issued 
in accordance with sections 21.197 and 21.199 of the Federal 
Aviation Regulations (14 CFR 21.197 and 21.199) to operate the 
airplane to a location where the airplane can be inspected (if the 
operator elects to do so), provided that the procedures and 
limitations in paragraphs (v)(3)(i) and (v)(3)(ii) of this AD are 
adhered to.
    (i) Flight Crew Limitations and Procedures:
    (A) Ferry flight with gear extended and pinned;
    (B) Landing to be conducted at a minimum descent rate;
    (C) Minimize braking on landing;
    (D) Flight to be conducted in accordance with Section 4.8 of the 
Aircraft Operating Manual (AOM);
    (E) Only essential crew on board; and
    (F) Flight in known or forecast icing condition is prohibited.
    (ii) Maintenance Procedures:
    (A) Do the general visual inspection required by paragraph (h) 
of this AD;
    (B) Do the general visual inspections of the stabilizer stay and 
the hinge points of the MLG for general condition and security, in 
accordance with Bombardier Q400 All Operator Message 236A, dated 
September 11, 2007;
    (C) If no discrepancy is detected during the inspections 
required by paragraph (v)(3)(ii)(A) and (v)(3)(ii)(B) of this AD, 
before further flight, insert the ground lock pins and a wire lock 
of the MLG in place.
    (D) Ensure the nose landing gear ground lock is engaged.

Related Information

    (w) Refer to MCAI Canadian Airworthiness Directive CF-2007-20R2, 
dated February 6, 2009; Bombardier Service Bulletin 84-32-55, 
Revision A, dated March 10, 2008; Bombardier Service Bulletin 84-32-
60, Revision A, dated September 29, 2008; Bombardier Repair Drawing 
8/4-32-059, Issue 7, dated June 26, 2008; and Bombardier Temporary 
Revision MRB-35, dated November 18, 2008, to the Bombardier Q400 
Dash 8 Maintenance Requirements Manual (PSM 1-84-7); for related 
information.

[[Page 12634]]

    Issued in Renton, Washington, on February 22, 2011.
Kalene C. Yanamura,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2011-5161 Filed 3-7-11; 8:45 am]
BILLING CODE 4910-13-P
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