[Federal Register: June 2, 2009 (Volume 74, Number 104)]
[Rules and Regulations]
[Page 26288-26291]
[DOCID:fr02jn09-4]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2009-0498; Directorate Identifier 2009-NM-065-AD;
Amendment 39-15923; AD 2009-11-13]
RIN 2120-AA64

Airworthiness Directives; Learjet Model 45 Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule; request for comments.

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SUMMARY: We are adopting a new airworthiness directive (AD) for certain
Learjet Model 45 airplanes. For certain airplanes, this AD requires
repetitive inspections for chafing and other damage of the case drain
tube from the hydraulic pump case installed on the left-hand engine,
and corrective action if necessary. This AD also requires, for all
airplanes, repetitive inspections for discrepancies of the left
engine's nacelle tubing, repetitive inspections for evidence of fluid
leakage within the left engine accessory compartment, and corrective
actions if necessary. This AD was prompted by reports of chafed
hydraulic tubes in the left-hand engine. We are issuing this AD to
detect and correct chafed hydraulic tubes in the left-hand engine and
consequent hydraulic tube failure and uncontrolled loss of flammable
fluid within the engine cowling, which could result in a fire in the
engine nacelle and loss of control of the airplane.

DATES: This AD is effective June 17, 2009.
    The Director of the Federal Register approved the incorporation by
reference of certain publications listed in the AD as of June 17, 2009.
    We must receive comments on this AD by August 3, 2009.

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:<PHONE_NUMBER>.
     Mail: U.S. Department of Transportation, Docket
Operations, 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 W12-140, 1200 New
Jersey Avenue, SE., Washington, DC 20590, between 9 a.m. and 5 p.m.,
Monday through Friday, except Federal holidays.
    For service information identified in this AD, contact Learjet,
Inc., One Learjet Way, Wichita, Kansas 67209-2942; telephone 316-946-
2000; fax<PHONE_NUMBER>; e-mail<EMAIL_ADDRESS>Internet
http://www.bombardier.com.

Examining the AD Docket

    You may examine the AD docket on the Internet at http://
www.regulations.gov; or in person at the Docket Management Facility
between 9 a.m. and 5 p.m., Monday through Friday, except Federal
holidays. The AD docket contains this AD, the regulatory evaluation,
any comments received, and other information. The street address for
the Docket Office (telephone<PHONE_NUMBER>) is in the ADDRESSES section.
Comments will be available in the AD docket shortly after receipt.

FOR FURTHER INFORMATION CONTACT: James P. Galstad, Aerospace Engineer,
Systems and Propulsion Branch, ACE-116W, FAA, Wichita Aircraft
Certification Office, 1801 Airport Road, Room 100, Mid-Continent
Airport, Wichita, Kansas 67209; telephone<PHONE_NUMBER>; fax (316)
946-4107.

SUPPLEMENTARY INFORMATION:

Discussion

    We have received reports of chafing found on hydraulic tubing in
the left-hand engine. Specifically, the chafing was found on a case
drain tube from the hydraulic pump case installed on the left-hand
engine, on the lower forward cowl latch structure on the inboard side
of the engine. Chafing was also found on a hydraulic pressure tube, on
the hydraulic case drain tube on the left-hand engine, and on the
hydraulic supply tube on the oil reservoir on the left-hand engine.
Chafed hydraulic tubes in the left-hand engine and consequent hydraulic
tube failure and uncontrolled loss of flammable fluid within the engine
cowling, if not corrected, could result in a fire in the engine nacelle
and loss of control of the airplane.

Relevant Service Information

    We reviewed the following service bulletins:
     Bombardier Alert Service Bulletin A45-29-15, dated
December 26, 2006.
     Bombardier Alert Service Bulletin A40-29-03, dated
December 26, 2006.
    The service bulletins describe procedures for a detailed inspection
for chafing and other damage of the case drain tube from the hydraulic
pump case installed on the left-hand engine. The service bulletins also
describe procedures for repositioning any tube that has damage within
certain limits and replacing any tube that has damage that exceeds
those limits.
    We have reviewed the following temporary revisions (TRs):
     Learjet 40 Temporary Revision (TR) 71-1, dated April 28,
2009, to the Learjet 40 Maintenance Manual MM-105.
     Learjet 45 TR 71-1, dated April 28, 2009, to the Learjet
45 Maintenance Manual MM-104.
    The TRs describe procedures for repetitive detailed inspections for
discrepancies, including damage to the left engine's nacelle tubing and
inadequate clearance between any unsupported section of the tube or
other tubing and surrounding components. The TRs also describe
procedures for adjusting the tubing and clamping to achieve minimum
clearance and replacing any tube that has damage exceeding certain
limits.
    We have reviewed the engine--maintenance practices in the following
maintenance manual documents:
     Learjet 45 Maintenance Manual MM-104, Revision 47, dated
March 30, 2009, Powerplant-Maintenance Practices Section 71-00-00 and
Engine-Maintenance Practices Section 71-00-01 (for M45 airplanes).
     Learjet 40 Maintenance Manual MM-105, Revision 15, dated
March 30, 2009, Engine-Maintenance Practices Section 71-00-01 (for M40
airplanes).
    The engine-maintenance practices sections in the maintenance
manuals (MMs) describe procedures for a general visual inspection for
evidence of engine oil, hydraulic fluid, or fuel leakage within the
left engine accessory compartment. For airplanes on which there is
evidence of leakage, the MMs describe procedures for removing each
plumbing clamp within the area affected

by the service bulletins and MM TRs identified in this AD, and cleaning
and removing all evidence of fluid leakage. Tubing clamps that are
associated with inadequate clearance are replaced with new clamps.

FAA's Determination and Requirements of This AD

    We are issuing this AD because we evaluated all the relevant
information and determined the unsafe condition described previously is
likely to exist or develop in other products of the same type design.
This AD requires accomplishing the actions specified in the service
information described previously, except as discussed below.

Differences Between the AD and the Service Information

    Although the service bulletins provide for one-time inspections,
this AD requires that those inspections be repeated, until a
terminating action can be accomplished to adequately address the
identified unsafe condition. This difference has been coordinated with
the manufacturer.

Interim Action

    We consider this AD interim action. The manufacturer is currently
developing a modification that will address the unsafe condition
identified in this AD. Once this modification is developed, approved,
and available, we might consider additional rulemaking.

FAA's Justification and Determination of the Effective Date

    Chafed hydraulic tubes in the left-hand engine and consequent
hydraulic tube failure and uncontrolled loss of flammable fluid within
the engine cowling could result in a fire in the engine nacelle and
loss of control of the airplane. Because of our requirement to promote
safe flight of civil aircraft and thus the critical need to ensure the
proper functioning of the affected systems, and because of the short
compliance time involved with this action, this AD must be issued
immediately.
    Because an unsafe condition exists that requires the immediate
adoption of this AD, we find that notice and opportunity for prior
public comment hereon are impracticable and that good cause exists for
making this amendment effective in less than 30 days.

Comments Invited

    This AD is a final rule that involves requirements affecting flight
safety, and we did not provide you with notice and an opportunity to
provide your comments before it becomes effective. However, we invite
you to send any written data, views, or arguments about this AD. Send
your comments to an address listed under the ADDRESSES section. Include
``Docket No. FAA-2009-0498; Directorate Identifier 2009-NM-065-AD'' at
the beginning of your comments. We specifically invite comments on the
overall regulatory, economic, environmental, and energy aspects of this
AD. We will consider all comments received by the closing date and may
amend this AD because of 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 AD.

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

    This AD will not have federalism implications under Executive Order
13132. This AD will 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 that this AD:
    (1) Is not a ``significant regulatory action'' under Executive
Order 12866,
    (2) Is not a ``significant rule'' under 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.
    You can find our regulatory evaluation and the estimated costs of
compliance in the AD Docket.

List of Subjects in 14 CFR Part 39

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

Adoption of the Amendment

0
Accordingly, under the authority delegated to me by the Administrator,
the FAA amends 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

0
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]

0
2. The FAA amends Sec.  39.13 by adding the following new AD:

2009-11-13 Learjet: Amendment 39-15923. Docket No. FAA-2009-0498;
Directorate Identifier 2009-NM-065-AD.

Effective Date

    (a) This airworthiness directive (AD) is effective June 17,
2009.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to Learjet Model 45 airplanes, certificated
in any category, serial numbers 45-002 through 45-4000 inclusive.

Subject

    (d) Air Transport Association (ATA) of America Code 29:
Hydraulic power.

Unsafe Condition

    (e) This AD results from reports of chafed hydraulic tubes in
the left-hand engine. The Federal Aviation Administration is issuing
this AD to detect and correct chafed hydraulic tubes in the left-
hand engine and consequent hydraulic tube failure and uncontrolled
loss of flammable fluid within the engine cowling, which could
result in a fire in the engine nacelle and loss of control of the
airplane.

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.

Repetitive Inspections: Case Drain Tube

    (g) For airplanes having serial numbers identified in Table 1 of
this AD: Within 50 flight hours after the effective date of this AD,
do a detailed inspection for chafing and other damage of the case
drain tube from the hydraulic pump case installed on the left-hand
engine, in accordance with the applicable service bulletin
identified in Table 1 of this AD. If any damage is found, before
further flight, reposition or replace the tube,

as applicable, in accordance with the Accomplishment Instructions of
the service bulletin identified in Table 1 of this AD, as
applicable. Repeat the inspection thereafter at intervals not to
exceed 150 flight hours.

               Table 1--Service Bulletins for Inspections
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                 For--                                Use--
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Serial numbers 45-005 through 45-313     Bombardier Alert Service
 inclusive (commonly referred to as       Bulletin A45-29-15, dated
 ``M45'' airplanes).                      December 26, 2006.
Serial numbers 45-2001 through 45-2063   Bombardier Alert Service
 inclusive (commonly referred to as       Bulletin A40-29-03, dated
 ``M40'' airplanes).                      December 26, 2006.
------------------------------------------------------------------------

    Note 1: 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.''

Repetitive Inspections: Nacelle Tubing

    (h) Within 50 flight hours after the effective date of this AD,
do a detailed inspection for discrepancies of the left engine's
nacelle tubing, in accordance with the applicable temporary revision
(TR) identified in Table 2 of this AD. Discrepancies include damaged
tubing, and inadequate clearance between any unsupported section of
the tube or other tubing and surrounding components. If any
discrepancy is found, before further flight, adjust the tubing and
clamping or replace the tubing, as applicable, in accordance with
the applicable TR identified in Table 2 of this AD. Repeat the
inspection thereafter at intervals not to exceed 150 flight hours.

                      Table 2--TRs for Inspections
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                 For--                                Use--
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Serial numbers 45-2001 through 45-4000   Learjet 40 TR 71-1, dated April
 inclusive (commonly referred to as       28, 2009, to the Learjet 40
 ``M40'' airplanes).                      Maintenance Manual MM-105.
Serial numbers 45-002 through 45-2000    Learjet 45 TR 71-1, dated April
 inclusive (commonly referred to as       28, 2009, to the Learjet 45
 ``M45'' airplanes).                      Maintenance Manual MM-104.
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Concurrent Inspections: Fluid Leakage

    (i) Concurrently with each inspection required by paragraph (h)
of this AD, do a detailed inspection for evidence of engine oil,
hydraulic fluid, or fuel leakage within the left engine accessory
compartment, in accordance with the applicable maintenance manual
section identified in Table 3 of this AD. If there is evidence of
leakage: Before further flight, remove each plumbing clamp within
the inspection areas specified in paragraphs (g) and (h) of this AD,
and clean and remove all evidence of fluid leakage.

          Table 3--Maintenance Manual Sections for Inspections
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                 For--                                Use--
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Serial numbers 45-002 through 45-2000    Section 71-00-00, ``Powerplant--
 inclusive (commonly referred to as       Maintenance Practices,'' and
 ``M45'' airplanes).                      Section 71-00-01, ``Engine--
                                          Maintenance Practices,'' of
                                          the Learjet 45 Maintenance
                                          Manual MM-104, Revision 47,
                                          dated March 30, 2009.
Serial numbers 45-2001 through 45-4000   Section 71-00-01, ``Engine--
 inclusive (commonly referred to as       Maintenance Practices,'' of
 ``M40'' airplanes).                      the Learjet 40 Maintenance
                                          Manual MM-105, Revision 15,
                                          dated March 30, 2009.
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Additional Corrective Action for Fluid Leakage and Inadequate Clearance

    (j) If evidence of fluid leakage was found during any inspection
required by paragraph (i) of this AD, or, if inadequate clearance
was found during any action required by paragraph (g) or (h) of this
AD: Before further flight, replace each clamp associated with the
fluid leakage or inadequate clearance with a new clamp, in
accordance with the applicable maintenance manual identified in
Table 3 of this AD.

Parts Installation

    (k) As of the effective date of this AD, no person may re-
install, on any airplane, any plumbing clamp that has been removed
in accordance with the requirements of this AD.

Alternative Methods of Compliance (AMOCs)

    (l)(1) The Manager, Wichita Aircraft Certification Office, 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:
James P. Galstad, Aerospace Engineer, Systems and Propulsion Branch,
ACE-116W, FAA, Wichita Aircraft Certification Office, 1801 Airport
Road, Room 100, Mid-Continent Airport, Wichita, Kansas 67209;
telephone<PHONE_NUMBER>; fax<PHONE_NUMBER>.
    (2) To request a different method of compliance or a different
compliance time for this AD, follow the procedures in 14 CFR 39.19.
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.

Material Incorporated by Reference

    (m) You must use the service information contained in Table 4 of
this AD to do the actions required by this AD, unless the AD
specifies otherwise.

                                   Table 4--Material Incorporated by Reference
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              Document                              Revision                                Date
----------------------------------------------------------------------------------------------------------------
Bombardier Alert Service Bulletin     Original............................  December 26, 2006.
 A40-29-03.
Bombardier Alert Service Bulletin     Original............................  December 26, 2006.
 A45-29-15.
Learjet 40 Temporary Revision 71-1    Original............................  April 28, 2009.
 to the Learjet Maintenance Manual
 MM-105.
Learjet 45 Temporary Revision 71-1    Original............................  April 28, 2009.
 to the Learjet Maintenance Manual
 MM-104.
Section 71-00-00 of the Learjet 45    Revision 47.........................  March 30, 2009.
 Maintenance Manual MM-104.
Section 71-00-01 of the Learjet 45    Revision 47.........................  March 30, 2009.
 Maintenance Manual MM-104.
Section 71-00-01 of the Learjet 40    Revision 15.........................  March 30, 2009.
 Maintenance Manual MM-105.
----------------------------------------------------------------------------------------------------------------

    Learjet 40 Maintenance Manual MM-105, Revision 15, dated March
30, 2009, has the following effective pages:

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                                                                 List of effective pages
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        Page title/description                     Page number(s)                        Revision number                    Date shown on page(s)
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Maintenance Manual Title Page........  None shown...........................  15..................................  March 30, 2009.
Maintenance Manual Revision            1-2..................................  None Shown *........................  March 30, 2009.
 Highlights.
Record of Revisions..................  1....................................  None Shown *........................  March 30, 2009.
Chapter 71 List of Effective Pages...  1....................................  None Shown *........................  March 30, 2009.
Section 71-00-01.....................  201-223..............................  None Shown *........................  December 25, 2006.
--------------------------------------------------------------------------------------------------------------------------------------------------------

    (*Only the Maintenance Manual Title Page and Record of Revisions
of Learjet 40 Maintenance Manual MM-104 have revision level
information. These pages do not have this information.) Learjet 45
Maintenance Manual MM-104, Revision 47, dated March 30, 2009, has
the following effective pages:

--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                 List of effective pages
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        Page title/description                     Page number(s)                        Revision number                    Date shown on page(s)
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Maintenance Manual Title Page........  None Shown...........................  47..................................  March 30, 2009.
Maintenance Manual Revision            1-3..................................  None Shown *........................  March 30, 2009.
 Highlights.
Record of Revisions..................  1-2..................................  None Shown *........................  March 30, 2009.
Chapter 71 List of Effective Pages...  1....................................  None Shown *........................  March 30, 2009.
Section 71-00-00.....................  201..................................  None Shown *........................  April 10, 1998.
Section 71-00-01.....................  201-223..............................  None Shown *........................  April 28, 2008.
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    (*Only the Maintenance Manual Title Page and Record of Revisions
of Learjet 45 Maintenance Manual MM-104 have revision level
information. These pages do not have this information.)
    (1) The Director of the Federal Register approved the
incorporation by reference of this service information under 5
U.S.C. 552(a) and 1 CFR part 51.
    (2) For service information identified in this AD, contact
Learjet, Inc., One Learjet Way, Wichita, Kansas 67209-2942;
telephone<PHONE_NUMBER>; fax<PHONE_NUMBER>; e-mail
<EMAIL_ADDRESS>Internet http://www.bombardier.com.
    (3) You may review copies of the 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<PHONE_NUMBER> or<PHONE_NUMBER>.
    (4) You may also review copies of the service information that
is incorporated by reference at the National Archives and Records
Administration (NARA). For information on the availability of this
material at NARA, call<PHONE_NUMBER>, or go to: http://
www.archives.gov/federal_register/code_of_federal_regulations/
ibr_locations.html.

    Issued in Renton, Washington, on May 20, 2009.
Stephen P. Boyd,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. E9-12518 Filed 6-1-09; 8:45 am]

BILLING CODE 4910-13-P


[Federal Register Volume 77, Number 72 (Friday, April 13, 2012)]
[Rules and Regulations]
[Page 22216]
[FR Doc No: 2012-8874]

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DEPARTMENT OF HOMELAND SECURITY

Coast Guard

33 CFR Part 117

[Docket No. USCG-2012-0176]

Drawbridge Operation Regulations; Atlantic Intracoastal Waterway,
Fort Lauderdale, FL

AGENCY: Coast Guard, DHS.

ACTION: Notice of temporary deviations from regulations.

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SUMMARY: The Commander, Seventh Coast Guard District, has issued
temporary deviations from the regulations governing the operation of
the following two bridges that span across the Atlantic Intracoastal
Waterway in Fort Lauderdale, Florida: The East Sunrise Boulevard (SR
838) Bridge, mile 1062.6; and the East Las Olas Bridge, mile 1064. The
deviations are necessary due to the high volume of vessel and vehicle
traffic anticipated during the Lauderdale Air Show. With the exception
of opening for passage of public vessels of the United States, vessels
in distress, and tugs with tows, the bridges will not open in the
evening during during the Lauderdale Air Show.

DATES: These deviations are effective from 4 p.m. on April 28, 2012
through 6 p.m. on April 29, 2012.

ADDRESSES: Documents mentioned in this preamble as being available in
the docket are part of docket USCG-2012-0176 and are available online
by going to http://www.regulations.gov, inserting USCG-2012-0176 in the
``Keyword'' box and then clicking ``Search''. They are also available
for inspection or copying at the Docket Management Facility (M-30),
U.S. Department of Transportation, West Building Ground Floor, Room
W12-140, 1200 New Jersey Avenue SE., Washington, DC 20590, between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays.

FOR FURTHER INFORMATION CONTACT: If you have questions on this rule,
call or email Michael Lieberum, Seventh District Bridge Branch, Coast
Guard; telephone<PHONE_NUMBER>, email<EMAIL_ADDRESS>If
you have questions on viewing the docket, call Renee V. Wright, Program
Manager, Docket Operations, telephone<PHONE_NUMBER>.

SUPPLEMENTARY INFORMATION: The City of Fort Lauderdale Police
Department has requested temporary modifications to the operating
schedules of the East Sunrise Boulevard (SR 838) Bridge and the East
Las Olas Bridge in Fort Lauderdale, Florida.
    The Lauderdale Air Show generates a high volume of vessel and
vehicle traffic. In past years, opening these bridges has resulted in
significant vehicle congestion. By allowing the bridges to remain
closed to navigation from 4 p.m. until 6 p.m. during the Lauderdale Air
Show, traffic congestion will be reduced.
    The details and regular operating schedule for each bridge are set
forth below.
    1. East Sunrise Boulevard (SR 838) Bridge, mile 1062.6. The
vertical clearance of the East Sunrise Boulevard (SR 838) Bridge,
across the Atlantic Intracoastal Waterway, is 21 feet. The normal
operating schedule for the East Sunrise Boulevard (SR 838) Bridge is
set forth in 33 CFR 117.261(bb)(6) requires the draw to open on the
hour and half-hour. On the first weekend in May, the draw need not open
from 4 p.m. to 6 p.m. on Saturday and Sunday, and, on the first
Saturday in May, the draw need not open from 9:45 p.m. to 10:45 p.m.
    2. East Las Olas Bridge, mile 1064. The vertical clearance of the
East Las Olas Bridge, across the Atlantic Intracoastal Waterway, is 24
feet. The normal operating schedule for the East Last Olas Bridge is
set forth in 33 CFR 117.261(bb)(7) and requires the bridge to open on
the quarter-hour and three-quarter hour. On the first weekend in May,
the draw need not open from 4 p.m. to 6 p.m. on Saturday and Sunday,
and, on the first Saturday in May, the draw need not open from 9:45
p.m. to 10:45 p.m.
    As a result of these temporary deviations, the East Sunrise
Boulevard (SR 838) Bridge and the East Las Olas Bridge will remain
closed to navigation from 4 p.m. to 6 p.m. on Saturday, April 28, 2012
and Sunday, April 29, 2012. However, the drawspans will open as soon as
possible at any time for the passage of public vessels of the United
States, vessels in distress, and tugs with tows.
    In accordance with 33 CFR 117.35(e), the drawbridges must return to
their regular operating schedules immediately at the end of the
designated time period. These deviations from the operating regulations
are authorized under 33 CFR 117.35.

    Dated: March 6, 2012.
B.L. Dragon,
Bridge Program Director, Seventh Coast Guard District.
[FR Doc. 2012-8874 Filed 4-12-12; 8:45 am]
BILLING CODE 9110-04-P