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2014-13-07 THE BOEING COMPANY: Amendment 39-17883; Docket No. FAA-2012-0863; Directorate Identifier 2012-NM-108-AD.
(a) EFFECTIVE DATE

    This AD is effective August 19, 2014.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD applies to The  Boeing Company airplanes, certificated in  any
    category, as identified in paragraphs (c)(1) and (c)(2) of this AD.

(1) Model 737-300, -400 and -500 series airplanes, as identified in Boeing
    Special Attention Service Bulletin 737-33-1149, dated April 13, 2012.

(2) Model 737-600, -700, -700C, -800, -900 and -900ER series airplanes, as
    identified  in  Boeing Special Attention Service Bulletin 737-33-1146,
    Revision 1, dated July 9, 2013.

(3) Installation of Supplemental Type Certificate (STC) ST00830SE (http://
    rgl.faa.gov/Regulatory-and-Guidance-Library/rgstc.nsf/0/da95c49000906c
    7086257be80044d3d9/$FILE/ST00830SE.pdf) does not affect the ability to
    accomplish the actions required  by this AD. Therefore,  for airplanes
    on which STC ST00830SE is installed, a "change in product" alternative
    method  of  compliance (AMOC)  approval  request is  not  necessary to
    comply with the requirements of 14 CFR 39.17.

(d) SUBJECT

    Air Transport Association (ATA) of America Code 33, Lights.

(e) UNSAFE CONDITION

    This  AD  was  prompted  by   a  review  of  the  tail   strobe  light
    installation,  which  revealed  that  the  tail  strobe  light  is not
    electrically  bonded  to primary  structure  of the  airplane.  We are
    issuing this AD to  prevent, in case of  a direct lightning strike  to
    the  tail strobe  light, damage  to  the  operation of  other critical
    airplane systems due to  electromagnetic coupling and large  transient
    voltages, and damage  to the control  mechanisms or surfaces  due to a
    fire, which could result in loss of control of the airplane.

(f) COMPLIANCE

    Comply  with this  AD within  the compliance  times specified,  unless
    already done.

(g) TAIL STROBE LIGHT INSTALLATION  FOR  MODEL 737-600, -700, -700C, -800,
    -900, AND -900ER SERIES AIRPLANES

    For  Model  737-600,  -700,  -700C,  -800,  -900,  and  -900ER  series
    airplanes on which the  actions specified in Boeing  Special Attention
    Service Bulletin 737-33-1146,  dated November 2, 2011,  have not  been
    done before the effective date of this AD: Within 72 months after  the
    effective date of  this AD, install  a new tail  strobe light housing,
    install a  new disconnect  bracket, and  change the  wire bundles,  in
    accordance with Part  1 of the  Accomplishment Instructions of  Boeing
    Special Attention Service Bulletin 737-33-1146, Revision 1, dated July
    9, 2013, except  as required by  paragraphs (g)(1) and  (g)(2) of this
    AD.

(1) Where  Figure 8,  Flag Note 3,  of  Boeing  Special  Attention Service
    Bulletin 737-33-1146, Revision 1, dated July 9, 2013, refers to solder
    sleeve BACS13CT3C,  the shield  splice contained  in splice  kit D-150
    -0168 may be  used in lieu  of solder sleeve  (BACS13CT3C), provided a
    ground wire is used.

Note 1 to paragraph (g)(1) of this AD: Guidance for wire-type  information
for the  ground wires  may be  found in  Boeing Standard  Wiring Practices
Manual (SWPM) D6-54446, Section 20-10-15.

(2) Where the second sentence  of  note (c) of Figure 3 of the Accomplish-
    ment Instructions of Boeing Special Attention Service Bulletin  737-33
    -1146,  Revision  1, dated  July  9, 2013,  specifies  to "Maintain  a
    minimum  of  1.7 Dimensions  fastener  edge margin  on  the disconnect
    bracket  and  the  stiffener,"  instead  "Maintain  a  minimum  of 1.7
    diameter  fastener  edge  margin on  the  disconnect  bracket and  the
    stiffener."

(h) INSPECTION  AND  CORRECTIVE  ACTIONS  FOR  MODEL 737-600, -700, -700C,
    -800, -900, AND -900ER SERIES AIRPLANES

    For  Model  737-600,  -700,  -700C,  -800,  -900,  and  -900ER  series
    airplanes, on which the actions specified in Boeing Special  Attention
    Service Bulletin 737-33-1146, dated  November 2, 2011, have  been done
    before  the effective  date of  this AD:  Within 72  months after  the
    effective date of  this AD, do  a general visual  inspection to ensure
    there  is  fillet  sealant  between  the  disconnect  bracket  and the
    receptacle  connector  D44582J,  and  on  the  fasteners,  and  do all
    applicable  corrective  actions,  in accordance  with  Part  2 of  the
    Accomplishment  Instructions  of  Boeing  Special  Attention   Service
    Bulletin  737-33-1146,  Revision  1,  dated  July  9,  2013.  Do   all
    applicable corrective actions before further flight.

(i) TAIL STROBE LIGHT INSTALLATION FOR MODEL 737-300, -400 AND -500 SERIES
    AIRPLANES

    For Model 737-300, -400, and  -500 series airplanes: Within 72  months
    after the effective date of this  AD, install a new tail strobe  light
    housing,  install  a  new  disconnect  bracket,  and  change  the wire
    bundles, in accordance with the Accomplishment Instructions of  Boeing
    Special Attention Service Bulletin 737-33-1149, dated April 13, 2012.

(j) ALTERNATIVE METHODS OF COMPLIANCE (AMOCS)

(1) The Manager, Seattle Aircraft Certification Office (ACO), FAA, has the
    authority to approve AMOCs for this AD,  if requested using the proce-
    dures found in 14 CFR 39.19.  In  accordance  with 14 CFR 39.19,  send
    your  request  to  your  principal inspector or local Flight Standards
    District Office,  as  appropriate.  If sending information directly to
    the manager of the ACO,  send it to the attention of the person ident-
    ified in paragraph (k) of this AD.  Information  may  be  emailed  to:
    9-ANM-Seattle-ACO-AMOC-Requests@faa.gov.

(2) Before using any approved AMOC,  notify your appropriate principal in-
    spector,  or  lacking a principal inspector,  the manager of the local
    flight standards district office/certificate holding district office.

(3) An AMOC that  provides  an  acceptable level of safety may be used for
    any  repair  required by  this  AD if  it  is approved  by  the Boeing
    Commercial Airplanes Organization Designation Authorization (ODA) that
    has  been  authorized  by  the Manager,  Seattle  ACO,  to  make those
    findings. For a repair method to be approved, the repair must meet the
    certification  basis   of  the   airplane,  and   the  approval   must
    specifically refer to this AD.

(k) RELATED INFORMATION

(1) For more information about this AD,  contact Marie Hogestad, Aerospace
    Engineer, Systems and Equipment Branch FAA, ANM-130S, Seattle Aircraft
    Certification  Office,  1601 Lind Avenue SW.,  Renton,  WA 98057-3356;
    phone: 425-917-6418; fax: 425-917-6590; email: marie.hogestad@faa.gov.

(2) For service information identified in this AD that is not incorporated
    by  reference  in  this  AD,   contact  Boeing  Commercial  Airplanes,
    Attention:  Data  &  Services  Management,  P.O. Box 3707,  MC  2H-65,
    Seattle, WA 98124-2207;  telephone 206-544-5000, extension 1; fax 206-
    766-5680;  Internet  https://www.myboeingfleet.com.  You may view this
    referenced  service  information  at  the  FAA,   Transport   Airplane
    Directorate, 1601 Lind Avenue SW., Renton, WA.  For information on the
    availability of this material at the FAA, call 425-227-1221.

(l) MATERIAL INCORPORATED BY REFERENCE

(1) The  Director  of  the  Federal Register approved the incorporation by
    reference (IBR) of the  service  information  listed in this paragraph
    under 5 U.S.C. 552(a) and 1 CFR part 51.

(2) You must use this  service information as applicable to do the actions
    required by this AD, unless the AD specifies otherwise.

(i) Boeing  Special  Attention  Service Bulletin 737-33-1146,  Revision 1,
    dated July 9, 2013.

(ii) Boeing  Special Attention Service Bulletin 737-33-1149,  dated  April
     13, 2012.

(3) For Boeing service information identified in this AD,  contact  Boeing
    Commercial Airplanes, Attention: Data & Services Management, P. O. Box
    3707, MC 2H-65, Seattle, WA 98124-2207; telephone 206-544-5000, exten-
    sion 1; fax 206-766-5680; Internet https://www.myboeingfleet.com.

(4) You  may  view  this  service  information  at FAA, Transport Airplane
    Directorate, 1601 Lind Avenue SW., Renton, WA.  For information on the
    availability of this material at the FAA, call 425-227-1221.

(5) You  may  view  this  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
    202-741-6030,  or go to: http://www.archives.gov/federal-register/cfr/
    ibr-locations.html.

Issued in Renton, Washington, on  June 19, 2014. Michael Kaszycki,  Acting
Manager, Transport Airplane Directorate, Aircraft Certification Service.

FOR  FURTHER  INFORMATION  CONTACT:  Marie  Hogestad,  Aerospace Engineer,
Systems   and   Equipment   Branch,   FAA,   ANM-130S,   Seattle  Aircraft
Certification Office, 1601 Lind Avenue SW., Renton, WA 98057-3356;  phone:
425-917-6418; fax: 425-917-6590; email: marie.hogestad@faa.gov.
PREAMBLE 

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

SUMMARY: We are adopting a new airworthiness directive (AD) for certain
The Boeing Company Model 737-300, -400, -500, -600, -700, -700C, -800,
-900, and -900ER series airplanes. This AD was prompted by a review of
the tail strobe light installation, which revealed that the tail strobe
light is not electrically bonded to primary structure of the airplane.
This AD requires installing a new tail strobe light housing and a new
disconnect bracket, and changing the wire bundles. This AD also
requires, for certain airplanes, an inspection to determine if sealant
is applied, and corrective actions if necessary. We are issuing this AD
to prevent, in case of a direct lightning strike to the tail strobe
light, damage to the operation of other critical airplane systems due
to electromagnetic coupling and large transient voltages, and damage to
the control mechanisms or surfaces due to a fire, which could result in
loss of control of the airplane.

DATES: This AD is effective August 19, 2014.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of August 19,
2014.

ADDRESSES: For service information identified in this AD, contact
Boeing Commercial Airplanes, Attention: Data & Services Management, P.
O. Box 3707, MC 2H-65, Seattle, WA 98124-2207; telephone 206-544-5000,
extension 1; fax 206-766-5680; Internet https://www.myboeingfleet.com.
You may view this referenced service information at the FAA, Transport
Airplane Directorate, 1601 Lind Avenue SW., Renton, WA. 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 by searching for and locating Docket No. FAA-2012-
0863; 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 address for the Docket Office (phone: 800-647-
5527) is Docket Management Facility, U.S. Department of Transportation,
Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200
New Jersey Avenue SE., Washington, DC 20590.

FOR FURTHER INFORMATION CONTACT: Marie Hogestad, Aerospace Engineer,
Systems and Equipment Branch, FAA, ANM-130S, Seattle Aircraft
Certification Office, 1601 Lind Avenue SW., Renton, WA 98057-3356;
phone: 425-917-6418; fax: 425-917-6590; email: marie.hogestad@faa.gov.

SUPPLEMENTARY INFORMATION:

Discussion

We issued a supplemental notice of proposed rulemaking (SNPRM) to
amend 14 CFR part 39 by adding an AD that would apply to certain The
Boeing Company Model 737-300, -400, -500, -600, -700, -700C, -800, -
900, and -900ER series airplanes. The SNPRM published in the Federal
Register on March 12, 2014 (79 FR 13934). We preceded the SNPRM with a
notice of proposed rulemaking (NPRM) that published in the Federal
Register on September 6, 2012 (77 FR 54848). The NPRM proposed to
require installing a new tail strobe light housing and a new disconnect
bracket, and changing the wire bundles. The NPRM was prompted by a
review of the tail strobe light installation, which revealed that the
tail strobe light is not electrically bonded to primary structure of
the airplane. The SNPRM proposed to add, for certain airplanes, an
inspection to determine if sealant is applied and corrective actions if
necessary. We are issuing this AD to prevent, in case of a direct
lightning strike to the tail strobe light, damage to the operation of
other critical airplane systems due to electromagnetic coupling and
large transient voltages, and damage to the control mechanisms or
surfaces due to a fire, which could result in loss of control of the
airplane.

Comments

We gave the public the opportunity to participate in developing
this AD. We received no comments on the SNPRM (79 FR 13934, March 12,
2014) or on the determination of the cost to the public.

Clarification

We have changed the paragraph heading for paragraph (h) of this AD
to more accurately reflect the required actions therein.

Conclusion

We reviewed the relevant data and determined that air safety and
the public interest require adopting this AD as proposed except for
minor editorial changes. We have determined that these minor changes:
Are consistent with the intent that was proposed in the
SNPRM (79 FR 13934, March 12, 2014) for correcting the unsafe
condition; and
Do not add any additional burden upon the public than was
already proposed in the SNPRM (79 FR 13934, March 12, 2014).

Costs of Compliance

We estimate that this AD affects 1,433 airplanes of U.S. registry.
We estimate the following costs to comply with this AD:


                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
            Action                 Labor cost        Parts cost       Cost per product    Cost on U.S. operators
----------------------------------------------------------------------------------------------------------------
Installation for Model 737-     Up to 32 work-    Up to $14,886...  Up to $17,606......  Up to $6,971,976.
 300, -400, and -500 series      hours x $85 per
 airplanes, as identified in     hour = Up to
 Boeing Special Attention        $2,720.
 Service Bulletin 737-33-1149,
 dated April 13, 2012 (396
 U.S. registered airplanes).

Installation for Model 737- Up to 21 work- Up to $4,422.... Up to $6,207....... Up to $2,886,255. 600, -700, -700C, -800, -900, hours x $85 per and -900ER series airplanes, hour = Up to Group 1, as identified in $1,785. Boeing Special Attention Service Bulletin 737-33-1146, Revision 1, dated July 9, 2013 (465 U.S. registered airplanes).
Installation for Model 737- Up to 21 work- Up to $2,496.... Up to $4,281....... Up to $355,323. 600, -700, -700C, -800, -900, hours x $85 per and -900ER series airplanes, hour = Up to Group 2, as identified in $1,785. Boeing Special Attention Service Bulletin 737-33-1146, Revision 1, dated July 9, 2013 (83 U.S. registered airplanes).
Installation for Model 737- Up to 20 work- Up to $4,478.... Up to $6,178....... Up to $154,450. 600, -700, -700C, -800, -900, hours x $85 per and -900ER series airplanes, hour = Up to Group 3, as identified in $1,700. Boeing Special Attention Service Bulletin 737-33-1146, Revision 1, dated July 9, 2013 (25 U.S. registered airplanes).
Installation for Model 737- Up to 21 work- Up to $4,423.... Up to $6,208....... Up to $2,880,512. 600, -700, -700C, -800, -900, hours x $85 per and -900ER series airplanes, hour = Up to Group 4, as identified in $1,785. Boeing Special Attention Service Bulletin 737-33-1146, Revision 1, dated July 9, 2013 (464 U.S. registered airplanes). Inspection for Model 737-600, - Up to 2 work- $0.............. Up to $170......... Up to $176,290. 700, -700C, -800, -900 and - hours x $85 per 900ER series airplanes, as hour = Up to identified in Boeing Special $170. Attention Service Bulletin 737-33-1146, Revision 1, dated July 9, 2013 (up to 1,037 U.S. registered airplanes). ----------------------------------------------------------------------------------------------------------------


We estimate the following cost to apply sealant, based on the
results of the inspection. We have no way of determining the number of
aircraft that might need this sealant application:

On-Condition Costs

Action Labor cost Parts cost Cost per product
Sealant application 1 work-hour x $85 per hour = $85. Negligible $85

The parts cost to apply sealant between the disconnect bracket and
the receptacle connector D44582J, and on the fasteners is not included
in the estimate. It is considered ``Parts & Materials Supplied by the
Operator,'' which is referenced in Boeing Special Attention Service
Bulletin 737-33-1146, Revision 1, dated July 9, 2013.
According to the manufacturer, all of the costs of this AD may be
covered under warranty, thereby reducing the cost impact on affected
individuals. We do not control warranty coverage for affected
individuals. As a result, we have included all costs in our cost
estimate.

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),
(3) Will not affect intrastate aviation in Alaska, and
(4) 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.

List of Subjects in 14 CFR Part 39

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

Adoption of the Amendment

Accordingly, under the authority delegated to me by the
Administrator, the FAA amends 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 adding the following new airworthiness
directive (AD):