Airworthiness Directives; McDonnell Douglas Corporation Model DC-9-14, DC-9-15, and DC-9-15F Airplanes; and DC-9-20, DC-9-30, DC-9-40, and DC-9-50 Series Airplanes, 62331-62333 [2010-25374]

Download as PDF Federal Register / Vol. 75, No. 195 / Friday, October 8, 2010 / Proposed Rules For the Nuclear Regulatory Commission. Annette Vietti-Cook, Secretary of the Commission. [FR Doc. 2010–25397 Filed 10–7–10; 8:45 am] BILLING CODE 7590–01–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2010–0958; Directorate Identifier 2010–NM–188–AD] RIN 2120–AA64 Airworthiness Directives; McDonnell Douglas Corporation Model DC–9–14, DC–9–15, and DC–9–15F Airplanes; and DC–9–20, DC–9–30, DC–9–40, and DC–9–50 Series Airplanes Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). AGENCY: We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD would require installing new in-line fuses for the fuel level float switch and new in-line fuses for the pressure switch, as applicable, and changing the wiring. The proposed actions would affect the left and right wing forward spars, center wing forward spar, forward auxiliary fuel tank, and aft auxiliary fuel tank, as applicable. This proposed AD was prompted by fuel system reviews conducted by the manufacturer. We are proposing this AD to prevent the potential of ignition sources inside fuel tanks, which, in combination with flammable fuel vapors, could result in fuel tank explosions and consequent loss of the airplane. DATES: We must receive comments on this proposed AD by November 22, 2010. SUMMARY: 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, M–30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue, SE., Washington, DC 20590. • Hand Delivery: Deliver to Mail address above between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. For service information identified in this proposed AD, contact Boeing erowe on DSK5CLS3C1PROD with PROPOSALS-1 ADDRESSES: VerDate Mar<15>2010 13:38 Oct 07, 2010 Jkt 223001 Commercial Airplanes, Attention: Data & Services Management, 3855 Lakewood Boulevard, MC D800–0019, Long Beach, California 90846–0001; telephone 206–544–5000, extension 2; fax 206–766–5683; e-mail dse.boecom@boeing.com; Internet https://www.myboeingfleet.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 Management Facility 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 Office (phone: 800–647–5527) is in the ADDRESSES section. Comments will be available in the AD docket shortly after receipt. FOR FURTHER INFORMATION CONTACT: Samuel Lee, Aerospace Engineer, Propulsion Branch, ANM–140L, FAA, Los Angeles Aircraft Certification Office, 3960 Paramount Boulevard, Lakewood, California 90712–4137; telephone (562) 627–5262; fax (562) 627–5210, e-mail: Samuel.Lee@faa.gov. SUPPLEMENTARY INFORMATION: Comments Invited We invite you to send any written relevant data, views, or arguments about this proposal. Send your comments to an address listed under the ADDRESSES section. Include ‘‘Docket No. FAA– 2010–0958; Directorate Identifier 2010– NM–188–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 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 proposed AD. Discussion The FAA has examined the underlying safety issues involved in fuel tank explosions on several large PO 00000 Frm 00002 Fmt 4702 Sfmt 4702 62331 transport airplanes, including the adequacy of existing regulations, the service history of airplanes subject to those regulations, and existing maintenance practices for fuel tank systems. As a result of those findings, we issued a regulation titled ‘‘Transport Airplane Fuel Tank System Design Review, Flammability Reduction and Maintenance and Inspection Requirements’’ (66 FR 23086, May 7, 2001). In addition to new airworthiness standards for transport airplanes and new maintenance requirements, this rule included Special Federal Aviation Regulation No. 88 (‘‘SFAR 88,’’ Amendment 21–78, and subsequent Amendments 21–82 and 21–83). Among other actions, SFAR 88 requires certain type design (i.e., type certificate (TC) and supplemental type certificate (STC)) holders to substantiate that their fuel tank systems can prevent ignition sources in the fuel tanks. This requirement applies to type design holders for large turbine-powered transport airplanes and for subsequent modifications to those airplanes. It requires them to perform design reviews and to develop design changes and maintenance procedures if their designs do not meet the new fuel tank safety standards. As explained in the preamble to the rule, we intended to adopt airworthiness directives to mandate any changes found necessary to address unsafe conditions identified as a result of these reviews. In evaluating these design reviews, we have established four criteria intended to define the unsafe conditions associated with fuel tank systems that require corrective actions. The percentage of operating time during which fuel tanks are exposed to flammable conditions is one of these criteria. The other three criteria address the failure types under evaluation: Single failures, single failures in combination with a latent condition(s), and in-service failure experience. For all four criteria, the evaluations included consideration of previous actions taken that may mitigate the need for further action. We have determined that the actions identified in this AD are necessary to reduce the potential of ignition sources inside fuel tanks, which, in combination with flammable fuel vapors, could result in fuel tank explosions and consequent loss of the airplane. An investigation conducted by the airplane manufacturer has revealed that fuel level float switch wires located on the left and right wing forward spars, the center tank forward spar, and the forward and aft auxiliary fuel tanks, and pressure switch wires located on the E:\FR\FM\08OCP1.SGM 08OCP1 62332 Federal Register / Vol. 75, No. 195 / Friday, October 8, 2010 / Proposed Rules forward and aft auxiliary fuel tanks, are routed in the same bundles as power wires. If a short circuit between a fuel level float or pressure switch wire and a power wire occurs, an over-current can cause excessive temperature in the fuel level float or pressure switch wire, resulting in damage, and could become a potential ignition source. Adding an in-line fuse as a self-contained component in each fuel level float and pressure switch circuit will minimize the possibility of excessive temperatures in the fuel level float or pressure switch wires. If a short circuit between a fuel level float or pressure switch and a power wire occurs, the result could be a fuel tank explosion and consequent loss of the airplane. Relevant Service Information We reviewed Boeing Service Bulletin DC9–28–217, Revision 1, dated August 12, 2010. The service bulletin describes procedures for installing the in-line fuses of the fuel level float switch, inline fuses of the pressure switch, and changing the wiring, as applicable, on the left and right wing forward spars, center wing forward spar, forward auxiliary fuel tank, and aft auxiliary fuel tank, as applicable. The service bulletin also describes procedures for changing certain wiring. FAA’s Determination We are proposing 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. Proposed AD Requirements This proposed AD would require accomplishing the actions specified in the service information described previously. Costs of Compliance We estimate that this proposed AD will affect 275 airplanes of U.S. registry. We estimate the following costs to comply with this proposed AD: ESTIMATED COSTS Action Installation ................................. 1 Depending Labor cost Between $1,734 and $2,894 1. Cost on U.S. operators Between $476,850 and $795,850 1. on airplane group identified in Boeing Service Bulletin DC9–28–217, Revision 1, dated August 12, 2010. 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. 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: 13:38 Oct 07, 2010 (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), (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. 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 Regulatory Findings erowe on DSK5CLS3C1PROD with PROPOSALS-1 Cost per product Between $289 and $1,449 1. Up to 17 work-hours × $85 per hour = Up to $1,445 1. Authority for This Rulemaking VerDate Mar<15>2010 Parts cost Jkt 223001 1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40113, 44701. § 39.13 [Amended] 2. The FAA amends § 39.13 by adding the following new airworthiness directive (AD): McDonnell Douglas Corporation: Docket No. FAA–2010–0958; Directorate Identifier 2010–NM–188–AD. PO 00000 Frm 00003 Fmt 4702 Sfmt 4702 Comments Due Date (a) We must receive comments by November 22, 2010. Affected ADs (b) None. Applicability (c) This AD applies to McDonnell Douglas Corporation Model DC–9–14, DC–9–15, DC– 9–15F, DC–9–21, DC–9–31, DC–9–32, DC–9– 32 (VC–9C), DC–9–32F, DC–9–32F (C–9A), DC–9–32F (C9–B), DC–9–33F, DC–9–34, DC– 9–34F, DC–9–41, and DC–9–51 airplanes, certificated in any category; as identified in Boeing Service Bulletin DC9–28–217, Revision 1, dated August 12, 2010. Subject (d) Joint Aircraft System Component (JASC)/Air Transport Association (ATA) of America Code 28: Fuel. Unsafe Condition (e) This AD was prompted by fuel system reviews conducted by the manufacturer. We are issuing this AD to prevent the potential of ignition sources inside fuel tanks, which in combination with flammable fuel vapors, could result in fuel tank explosions and consequent loss of the airplane. Compliance (f) Comply with this AD within the compliance times specified, unless already done. Installation (g) Within 60 months after the effective date of this AD: Install new in-line fuses for the fuel level float switch and new in-line fuses for the pressure switch, as applicable; and change the wiring; on the left and right wing forward spars, center wing forward E:\FR\FM\08OCP1.SGM 08OCP1 Federal Register / Vol. 75, No. 195 / Friday, October 8, 2010 / Proposed Rules spar, forward auxiliary fuel tank, and aft auxiliary fuel tank, as applicable; in accordance with the Accomplishment Instructions of Boeing Service Bulletin DC9– 28–217, Revision 1, dated August 12, 2010. DEPARTMENT OF TRANSPORTATION Credit for Actions Accomplished in Accordance With Previous Service Information [Docket No. FAA–2009–0113; Directorate Identifier 2008–NE–25–AD] (h) Actions done before the effective date of this AD in accordance with Boeing Service Bulletin DC9–28–217, dated December 1, 2009, are acceptable for compliance with the requirements of paragraph (g) of this AD. Airworthiness Directives; Hamilton Sundstrand Propellers Model 247F Propellers (i)(1) The Manager, Los Angeles Aircraft Certification Office (ACO), FAA, has the authority to approve AMOCs for this AD, if requested using the procedures 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 identified in the Related Information section of this AD. (2) Before using any approved AMOC, notify your Principal Maintenance Inspector or Principal Avionics Inspector, as appropriate, or lacking a principal inspector, your local Flight Standards District Office. Related Information erowe on DSK5CLS3C1PROD with PROPOSALS-1 (j) For more information about this AD, contact Samuel Lee, Aerospace Engineer, Propulsion Branch, ANM–140L, FAA, Los Angeles ACO, 3960 Paramount Boulevard, Lakewood, California 90712–4137; phone: (562) 627–5262; fax: (562) 627–5210; e-mail: Samuel.Lee@faa.gov. (k) For service information identified in this AD, contact Boeing Commercial Airplanes, Attention: Data & Services Management, 3855 Lakewood Boulevard, MC D800–0019, Long Beach, California 90846– 0001; telephone 206–544–5000, extension 2; fax 206–766–5683; e-mail dse.boecom@boeing.com; Internet https:// www.myboeingfleet.com. You may review copies of the referenced service information at the FAA, Transport Airplane Directorate, the FAA, 1601 Lind Avenue, SW., Renton, Washington. For information on the availability of this material at the FAA, call 425–227–1221. Issued in Renton, Washington, on October 1, 2010. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. BILLING CODE 4910–13–P VerDate Mar<15>2010 13:38 Oct 07, 2010 Jkt 223001 14 CFR Part 39 RIN 2120–AA64 Alternative Methods of Compliance (AMOCs) [FR Doc. 2010–25374 Filed 10–7–10; 8:45 am] Federal Aviation Administration Federal Aviation Administration (FAA), DOT. ACTION: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period. AGENCY: This supplemental NPRM revises an earlier proposed airworthiness directive (AD) applicable to Hamilton Sundstrand Propellers model 247F propeller assemblies with certain part number (P/N) and serial number (S/N) blades. That proposed AD would require removing affected propeller blades from service. That proposed AD resulted from reports of blades with corrosion pits in the tulip area of the blades. This supplemental NPRM revises the proposed AD to remove certain propeller S/Ns from the applicability requirement, and to add additional propeller S/Ns to the applicability requirement. This proposed AD results from the manufacture’s latest service information containing propeller S/Ns that were not specified in the proposed AD. We are proposing this AD to prevent cracks from developing in the tulip area of the blade, which could result in separation of the blade and possible loss of airplane control. DATES: We must receive any comments on this proposed AD by December 7, 2010. ADDRESSES: You can get the service information identified in this AD from Hamilton Sundstrand Propeller Technical Team, One Hamilton Road, Mail Stop 1–3–AB43, Windsor Locks, CT 06096–1010; fax (860) 654–5107. The Docket Operations office is located at Docket Management Facility, U.S. Department of Transportation, 1200 New Jersey Avenue, SE., West Building Ground Floor, Room W12–140, Washington, DC 20590–0001. FOR FURTHER INFORMATION CONTACT: Michael Schwetz, Aerospace Engineer, Boston Aircraft Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; e-mail: michael.schwetz@faa.gov; telephone (781) 238–7761; fax (781) 238–7170. SUMMARY: PO 00000 Frm 00004 Fmt 4702 Sfmt 4702 62333 The FAA proposed to amend 14 CFR part 39 with a proposed AD. The proposed AD applies to Hamilton Sundstrand Propellers model 247F propeller assemblies with certain P/N and S/N blades. We published the proposed AD in the Federal Register on February 20, 2009 (74 FR 7833). That action proposed to require removing affected propeller blades from service. SUPPLEMENTARY INFORMATION: SUPPLEMENTARY INFORMATION: Comments Invited We invite you to send us any written relevant data, views, or arguments regarding this proposal. Send your comments to an address listed under ADDRESSES. Include ‘‘Docket No. FAA– 2009–0113; Directorate Identifier 2008– NE–25–AD’’ in the subject line of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of the proposed AD. We will consider all comments received by the closing date and may amend the proposed AD in light 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 with FAA personnel concerning this proposed AD. Using the search function of the Web site, anyone can find and read the comments in any of our dockets, including, if provided, the name of the individual who sent the comment (or signed the comment on behalf of an association, business, labor union, etc.). You may review the DOT’s complete Privacy Act Statement in the Federal Register published on April 11, 2000 (65 FR 19477–78). 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 the same as the Mail address provided in the ADDRESSES section. Comments will be available in the AD docket shortly after receipt. Discussion On February 11, 2009, we proposed to amend 14 CFR part 39 with a proposed AD. The proposed AD applies to E:\FR\FM\08OCP1.SGM 08OCP1

Agencies

[Federal Register Volume 75, Number 195 (Friday, October 8, 2010)]
[Proposed Rules]
[Pages 62331-62333]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2010-25374]


=======================================================================
-----------------------------------------------------------------------

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2010-0958; Directorate Identifier 2010-NM-188-AD]
RIN 2120-AA64


Airworthiness Directives; McDonnell Douglas Corporation Model DC-
9-14, DC-9-15, and DC-9-15F Airplanes; and DC-9-20, DC-9-30, DC-9-40, 
and DC-9-50 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. This proposed AD would require installing new 
in-line fuses for the fuel level float switch and new in-line fuses for 
the pressure switch, as applicable, and changing the wiring. The 
proposed actions would affect the left and right wing forward spars, 
center wing forward spar, forward auxiliary fuel tank, and aft 
auxiliary fuel tank, as applicable. This proposed AD was prompted by 
fuel system reviews conducted by the manufacturer. We are proposing 
this AD to prevent the potential of ignition sources inside fuel tanks, 
which, in combination with flammable fuel vapors, could result in fuel 
tank explosions and consequent loss of the airplane.

DATES: We must receive comments on this proposed AD by November 22, 
2010.

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, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue, SE., Washington, DC 20590.
     Hand Delivery: Deliver to Mail address above between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
    For service information identified in this proposed AD, contact 
Boeing Commercial Airplanes, Attention: Data & Services Management, 
3855 Lakewood Boulevard, MC D800-0019, Long Beach, California 90846-
0001; telephone 206-544-5000, extension 2; fax 206-766-5683; e-mail 
dse.boecom@boeing.com; Internet https://www.myboeingfleet.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 Management Facility 
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 Office (phone: 800-647-5527) is in the ADDRESSES 
section. Comments will be available in the AD docket shortly after 
receipt.

FOR FURTHER INFORMATION CONTACT: Samuel Lee, Aerospace Engineer, 
Propulsion Branch, ANM-140L, FAA, Los Angeles Aircraft Certification 
Office, 3960 Paramount Boulevard, Lakewood, California 90712-4137; 
telephone (562) 627-5262; fax (562) 627-5210, e-mail: 
Samuel.Lee@faa.gov.

SUPPLEMENTARY INFORMATION:

Comments Invited

    We invite you to send any written relevant data, views, or 
arguments about this proposal. Send your comments to an address listed 
under the ADDRESSES section. Include ``Docket No. FAA-2010-0958; 
Directorate Identifier 2010-NM-188-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 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 proposed AD.

Discussion

    The FAA has examined the underlying safety issues involved in fuel 
tank explosions on several large transport airplanes, including the 
adequacy of existing regulations, the service history of airplanes 
subject to those regulations, and existing maintenance practices for 
fuel tank systems. As a result of those findings, we issued a 
regulation titled ``Transport Airplane Fuel Tank System Design Review, 
Flammability Reduction and Maintenance and Inspection Requirements'' 
(66 FR 23086, May 7, 2001). In addition to new airworthiness standards 
for transport airplanes and new maintenance requirements, this rule 
included Special Federal Aviation Regulation No. 88 (``SFAR 88,'' 
Amendment 21-78, and subsequent Amendments 21-82 and 21-83).
    Among other actions, SFAR 88 requires certain type design (i.e., 
type certificate (TC) and supplemental type certificate (STC)) holders 
to substantiate that their fuel tank systems can prevent ignition 
sources in the fuel tanks. This requirement applies to type design 
holders for large turbine-powered transport airplanes and for 
subsequent modifications to those airplanes. It requires them to 
perform design reviews and to develop design changes and maintenance 
procedures if their designs do not meet the new fuel tank safety 
standards. As explained in the preamble to the rule, we intended to 
adopt airworthiness directives to mandate any changes found necessary 
to address unsafe conditions identified as a result of these reviews.
    In evaluating these design reviews, we have established four 
criteria intended to define the unsafe conditions associated with fuel 
tank systems that require corrective actions. The percentage of 
operating time during which fuel tanks are exposed to flammable 
conditions is one of these criteria. The other three criteria address 
the failure types under evaluation: Single failures, single failures in 
combination with a latent condition(s), and in-service failure 
experience. For all four criteria, the evaluations included 
consideration of previous actions taken that may mitigate the need for 
further action.
    We have determined that the actions identified in this AD are 
necessary to reduce the potential of ignition sources inside fuel 
tanks, which, in combination with flammable fuel vapors, could result 
in fuel tank explosions and consequent loss of the airplane.
    An investigation conducted by the airplane manufacturer has 
revealed that fuel level float switch wires located on the left and 
right wing forward spars, the center tank forward spar, and the forward 
and aft auxiliary fuel tanks, and pressure switch wires located on the

[[Page 62332]]

forward and aft auxiliary fuel tanks, are routed in the same bundles as 
power wires. If a short circuit between a fuel level float or pressure 
switch wire and a power wire occurs, an over-current can cause 
excessive temperature in the fuel level float or pressure switch wire, 
resulting in damage, and could become a potential ignition source. 
Adding an in-line fuse as a self-contained component in each fuel level 
float and pressure switch circuit will minimize the possibility of 
excessive temperatures in the fuel level float or pressure switch 
wires. If a short circuit between a fuel level float or pressure switch 
and a power wire occurs, the result could be a fuel tank explosion and 
consequent loss of the airplane.

Relevant Service Information

    We reviewed Boeing Service Bulletin DC9-28-217, Revision 1, dated 
August 12, 2010. The service bulletin describes procedures for 
installing the in-line fuses of the fuel level float switch, in-line 
fuses of the pressure switch, and changing the wiring, as applicable, 
on the left and right wing forward spars, center wing forward spar, 
forward auxiliary fuel tank, and aft auxiliary fuel tank, as 
applicable. The service bulletin also describes procedures for changing 
certain wiring.

FAA's Determination

    We are proposing 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.

Proposed AD Requirements

    This proposed AD would require accomplishing the actions specified 
in the service information described previously.

Costs of Compliance

    We estimate that this proposed AD will affect 275 airplanes of U.S. 
registry.
    We estimate the following costs to comply with this proposed AD:

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                                 Cost on U.S.
             Action                   Labor cost          Parts cost       Cost per product        operators
----------------------------------------------------------------------------------------------------------------
Installation....................  Up to 17 work-      Between $289 and    Between $1,734 and  Between $476,850
                                   hours x $85 per     $1,449 \1\.         $2,894 \1\.         and $795,850 \1\.
                                   hour = Up to
                                   $1,445 \1\.
----------------------------------------------------------------------------------------------------------------
\1\ Depending on airplane group identified in Boeing Service Bulletin DC9-28-217, Revision 1, dated August 12,
  2010.

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),
    (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.

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 adding the following new 
airworthiness directive (AD):

McDonnell Douglas Corporation: Docket No. FAA-2010-0958; Directorate 
Identifier 2010-NM-188-AD.

Comments Due Date

    (a) We must receive comments by November 22, 2010.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to McDonnell Douglas Corporation Model DC-9-
14, DC-9-15, DC-9-15F, DC-9-21, DC-9-31, DC-9-32, DC-9-32 (VC-9C), 
DC-9-32F, DC-9-32F (C-9A), DC-9-32F (C9-B), DC-9-33F, DC-9-34, DC-9-
34F, DC-9-41, and DC-9-51 airplanes, certificated in any category; 
as identified in Boeing Service Bulletin DC9-28-217, Revision 1, 
dated August 12, 2010.

Subject

    (d) Joint Aircraft System Component (JASC)/Air Transport 
Association (ATA) of America Code 28: Fuel.

Unsafe Condition

    (e) This AD was prompted by fuel system reviews conducted by the 
manufacturer. We are issuing this AD to prevent the potential of 
ignition sources inside fuel tanks, which in combination with 
flammable fuel vapors, could result in fuel tank explosions and 
consequent loss of the airplane.

Compliance

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

Installation

    (g) Within 60 months after the effective date of this AD: 
Install new in-line fuses for the fuel level float switch and new 
in-line fuses for the pressure switch, as applicable; and change the 
wiring; on the left and right wing forward spars, center wing 
forward

[[Page 62333]]

spar, forward auxiliary fuel tank, and aft auxiliary fuel tank, as 
applicable; in accordance with the Accomplishment Instructions of 
Boeing Service Bulletin DC9-28-217, Revision 1, dated August 12, 
2010.

Credit for Actions Accomplished in Accordance With Previous Service 
Information

    (h) Actions done before the effective date of this AD in 
accordance with Boeing Service Bulletin DC9-28-217, dated December 
1, 2009, are acceptable for compliance with the requirements of 
paragraph (g) of this AD.

Alternative Methods of Compliance (AMOCs)

    (i)(1) The Manager, Los Angeles Aircraft Certification Office 
(ACO), FAA, has the authority to approve AMOCs for this AD, if 
requested using the procedures 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 identified in the Related Information 
section of this AD.
    (2) Before using any approved AMOC, notify your Principal 
Maintenance Inspector or Principal Avionics Inspector, as 
appropriate, or lacking a principal inspector, your local Flight 
Standards District Office.

Related Information

    (j) For more information about this AD, contact Samuel Lee, 
Aerospace Engineer, Propulsion Branch, ANM-140L, FAA, Los Angeles 
ACO, 3960 Paramount Boulevard, Lakewood, California 90712-4137; 
phone: (562) 627-5262; fax: (562) 627-5210; e-mail: 
Samuel.Lee@faa.gov.
    (k) For service information identified in this AD, contact 
Boeing Commercial Airplanes, Attention: Data & Services Management, 
3855 Lakewood Boulevard, MC D800-0019, Long Beach, California 90846-
0001; telephone 206-544-5000, extension 2; fax 206-766-5683; e-mail 
dse.boecom@boeing.com; Internet https://www.myboeingfleet.com. You 
may review copies of the referenced service information at the FAA, 
Transport Airplane Directorate, the FAA, 1601 Lind Avenue, SW., 
Renton, Washington. For information on the availability of this 
material at the FAA, call 425-227-1221.


    Issued in Renton, Washington, on October 1, 2010.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2010-25374 Filed 10-7-10; 8:45 am]
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