Airworthiness Directives; Learjet Inc. Airplanes

[Federal Register Volume 79, Number 26 (Friday, February 7, 2014)]
[Rules and Regulations]
[Pages 7374-7377]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2014-02464]



[[Page 7374]]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2013-0691; Directorate Identifier 2012-NM-170-AD; 
Amendment 39-17678; AD 2013-24-04]
RIN 2120-AA64


Airworthiness Directives; Learjet Inc. Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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SUMMARY: We are superseding Airworthiness Directive (AD) 2003-19-11 for 
certain Learjet Inc. Model 60 airplanes. AD 2003-19-11 required 
determining if a certain fuel crossflow tube is installed; and follow-
on/corrective actions, as applicable. This new AD requires retaining 
all actions in AD 2003-19-11, and it also requires determining if a 
certain fuel crossflow tube is installed, performing repetitive 
measurements of the fuel crossflow tube and surrounding valves and 
cables, and doing corrective actions if necessary. In addition, this 
new AD expands the applicability of AD 2003-19-11. This AD was prompted 
by a report that airplanes produced since 2003 might also be subject to 
the unsafe condition; and that the minimum allowable clearance is not 
established in the airplane maintenance information. We are issuing 
this AD to prevent chafing and consequent failure of the fuel crossflow 
tube due to inadequate clearance between the tube and the flight 
control cables, which could result in loss of fuel from one fuel tank 
during normal operating conditions or loss of fuel from both main fuel 
tanks during fuel cross-feeding operations.

DATES: This AD is effective March 14, 2014.
    The Director of the Federal Register approved the incorporation by 
reference of certain publications listed in this AD as of November 3, 
2003 (68 FR 55812, September 29, 2003).

ADDRESSES: For service information identified in this AD, contact 
Learjet, Inc., One Learjet Way, Wichita, KS 67209-2942; telephone 316-
946-2000; fax 316-946-2220; email [email protected]; Internet 
http://www.bombardier.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/#!docketBrowser;rpp=25;po=0;D=FAA-2013-0691; 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: Jeff Janusz, Aerospace Engineer, 
Propulsion Branch, ACE-116W, FAA, Wichita Aircraft Certification Office 
(ACO), 1801 Airport Road, Room 100, Wichita, KS 67209; phone: 316-946-
4148; fax: 316-946-4107; email: [email protected].

SUPPLEMENTARY INFORMATION:

Discussion

    We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR 
part 39 to supersede AD 2003-19-11, Amendment 39-13314 (68 FR 55812, 
September 29, 2003). AD 2003-19-11 applied to certain Learjet Inc. 
Model 60 airplanes. The NPRM published in the Federal Register on 
August 13, 2013 (78 FR 49232). The NPRM was prompted by a report that 
airplanes produced since 2003 might also be subject to the unsafe 
condition; and that the minimum allowable clearance is not established 
in the airplane maintenance information. The NPRM proposed to continue 
to require determining if a certain fuel crossflow tube is installed; 
and follow-on/corrective actions, as applicable. The NPRM also proposed 
to require determining if a certain fuel crossflow tube is installed, 
performing repetitive measurements of the fuel crossflow tube and 
surrounding valves and cables, and doing corrective actions if 
necessary. In addition, the NPRM proposed to expand the applicability 
of AD 2003-19-11. We are issuing this AD to prevent chafing and 
consequent failure of the fuel crossflow tube due to inadequate 
clearance between the tube and the flight control cables, which could 
result in loss of fuel from one fuel tank during normal operating 
conditions or loss of fuel from both main fuel tanks during fuel cross-
feeding operations.

Comments

    We gave the public the opportunity to participate in developing 
this AD. We received no comments on the NPRM (78 FR 49232, August 13, 
2013) or on the determination of the cost to the public.

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:
    <bullet> Are consistent with the intent that was proposed in the 
NPRM (78 FR 49232, August 13, 2013) for correcting the unsafe 
condition; and
    <bullet> Do not add any additional burden upon the public than was 
already proposed in the NPRM (78 FR 49232, August 13, 2013).

Costs of Compliance

    We estimate that this AD affects 264 airplanes of U.S. registry.
    We estimate the following costs to comply with this AD:

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                                      Cost  on
                  Action                            Labor cost           Parts cost     Cost per        U.S.
                                                                                         product      operators
----------------------------------------------------------------------------------------------------------------
Inspection [retained actions from AD 2003- 2 work-hours x $85 per hour           $2          $172       $45,408
 19-11, Amendment 39-13314 (68 FR 55812,    = $170.
 September 29, 2003)].
----------------------------------------------------------------------------------------------------------------

    We estimate the following costs to do any necessary replacement 
that would be required based on the results of the inspection. We have 
no way of determining the number of aircraft that might need this 
replacement:

[[Page 7375]]



                                               On-Condition Costs
----------------------------------------------------------------------------------------------------------------
                                                                                                     Cost per
                    Action                                Labor cost               Parts cost        product
----------------------------------------------------------------------------------------------------------------
Replacement..................................  4 work-hours x $85 per hour =               $20             $360
                                                $340.
----------------------------------------------------------------------------------------------------------------

Paperwork Reduction Act

    A federal agency may not conduct or sponsor, and a person is not 
required to respond to, nor shall a person be subject to penalty for 
failure to comply with a collection of information subject to the 
requirements of the Paperwork Reduction Act unless that collection of 
information displays a current valid OMB control number. The control 
number for the collection of information required by this AD is 2120-
0056. The paperwork cost associated with this AD has been detailed in 
the Costs of Compliance section of this document and includes time for 
reviewing instructions, as well as completing and reviewing the 
collection of information. Therefore, all reporting associated with 
this AD is mandatory. Comments concerning the accuracy of this burden 
and suggestions for reducing the burden should be directed to the FAA 
at 800 Independence Ave. SW., Washington, DC 20591. ATTN: Information 
Collection Clearance Officer, AES-200.

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 have determined that 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

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 removing Airworthiness Directive (AD) 
2003-19-11, Amendment 39-13314 (68 FR 55812, September 29, 2003), and 
adding the following new AD:

2013-24-04 Learjet Inc.: Amendment 39-17678; Docket No. FAA-2013-
0691; Directorate Identifier 2012-NM-170-AD.

(a) Effective Date

    This AD is effective March 14, 2014.

(b) Affected ADs

    This AD supersedes AD 2003-19-11, Amendment 39-13314 (68 FR 
55812, September 29, 2003).

(c) Applicability

    This AD applies to Learjet Inc. Model 60 airplanes, certificated 
in any category, serial numbers 60-001 through 60-409 inclusive.

(d) Subject

    Air Transport Association (ATA) of America Code 28, Fuel.

(e) Unsafe Condition

    This AD was prompted by a report that airplanes produced since 
2003 might also be subject to the unsafe condition; and that the 
minimum allowable clearance is not established in the airplane 
maintenance information. We are issuing this AD to prevent chafing 
and consequent failure of the fuel crossflow tube due to inadequate 
clearance between the tube and the flight control cables, which 
could result in loss of fuel from one fuel tank during normal 
operating conditions or loss of fuel from both main fuel tanks 
during fuel cross-feeding operations.

(f) Compliance

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

(g) Retained Part Identification for Airplanes Having Serial Numbers 
60-001 Through 60-145 Inclusive

    This paragraph restates the part identification required by 
paragraph (a) of AD 2003-19-11, Amendment 39-13314 (68 FR 55812, 
September 29, 2003). For airplanes having serial numbers 60-001 
through 60-145 inclusive: Within 25 flight hours after November 3, 
2003 (the effective date of AD 2003-19-11), inspect the fuel 
crossflow tube to determine whether part number (P/N) 6026020-005 is 
installed. Instead of inspecting the tube, a review of airplane 
maintenance records is acceptable if the part number of the tube can 
be positively determined from that review.

(h) Retained Clearance Measurement and Corrective Action for Airplanes 
Having Serial Numbers 60-001 Through 60-145 Inclusive, With Revised 
Repair Language

    This paragraph restates the clearance measurement and corrective 
action required by paragraph (b) of AD 2003-19-11, Amendment 39-
13314 (68 FR 55812, September 29, 2003), with revised repair 
language. For airplanes having serial numbers 60-001 through 60-145 
inclusive: If P/N 6026020-005 is found installed during the review 
or inspection required by paragraph (g) of this AD, before further 
flight, measure the clearance between the fuel crossflow tube and 
the flight control cables to determine if it is at least 0.35 inch, 
per paragraph 2.B.(8) of the Accomplishment Instructions of 
Bombardier Alert Service Bulletin A60-28-3, Revision 2, dated 
October 26, 1998.
    (1) If the clearance is 0.35 inch or more, no further action is 
required by this paragraph.
    (2) If the clearance is less than 0.35 inch, before further 
flight, repair in accordance with a method approved by the Manager, 
Wichita Aircraft Certification Office (ACO), FAA. For a repair 
method to be approved by the Manager, Wichita ACO, as required by

[[Page 7376]]

this paragraph, the Manager's approval letter must specifically 
refer to this AD.

    Note 1 to paragraphs (h) and (j) of this AD: Bombardier Alert 
Service Bulletin A60-28-3, Revision 2, dated October 26, 1998, 
Figure 1, Detail D, incorrectly identifies the fuel crossflow tube 
to be installed as P/N 6026020-001. The manufacturer is aware of 
this error and stated it plans to correct the part number in the 
next revision of the service information.

(i) Retained Part Replacement, Measurement, and Repair for Airplanes 
Having Serial Numbers 60-001 Through 60-055 Inclusive, With Revised 
Repair Language

    This paragraph restates the part replacement, clearance 
measurement, and corrective action required by paragraph (c) of AD 
2003-19-11, Amendment 39-13314 (68 FR 55812, September 29, 2003), 
with revised repair language. For airplanes having serial numbers 
60-001 through 60-055 inclusive: If P/N 6026020-005 is not found 
installed during the review or inspection required by paragraph (g) 
of this AD, within 90 days after accomplishing the review or 
inspection, replace the existing fuel crossflow tube with a new fuel 
crossflow tube having P/N 6026020-005, and measure the clearance 
between the newly installed fuel crossflow tube and the flight 
control cables, per paragraph 2.A. of the Accomplishment 
Instructions of Bombardier Service Bulletin 60-28-4, Revision 2, 
dated August 22, 2001.
    (1) If the clearance is 0.35 inch or more, no further action is 
required by this paragraph.
    (2) If the clearance is less than 0.35 inch, before further 
flight, repair in accordance with a method approved by the Manager, 
Wichita ACO, FAA. For a repair method to be approved by the Manager, 
Wichita ACO, as required by this paragraph, the Manager's approval 
letter must specifically refer to this AD.

(j) Retained Part Replacement, Measurement, and Repair for Airplanes 
Having Serial Numbers 60-056 Through 60-145 Inclusive, With Revised 
Repair Language

    This paragraph restates the part replacement, clearance 
measurement, and corrective action required by paragraph (d) of AD 
2003-19-11, Amendment 39-13314 (68 FR 55812, September 29, 2003), 
with revised repair language. For airplanes having serial numbers 
60-056 through 60-145 inclusive: If P/N 6026020-005 is not found 
installed during the review or inspection required by paragraph (g) 
of this AD, within 90 days after accomplishing the review or 
inspection, replace the existing fuel crossflow tube with a new fuel 
crossflow tube having P/N 6026020-005, and measure the clearance 
between the newly installed fuel crossflow tube and the flight 
control cables to determine if the clearance is at least 0.35 inch, 
per paragraph 2.B. of the Accomplishment Instructions of Bombardier 
Alert Service Bulletin A60-28-3, Revision 2, dated October 26, 1998.
    (1) If the clearance is 0.35 inch or more, no further action is 
required by this paragraph.
    (2) If the clearance is less than 0.35 inch, before further 
flight, repair in accordance with a method approved by the Manager, 
Wichita ACO, FAA. For a repair method to be approved by the Manager, 
Wichita ACO, as required by this paragraph, the Manager's approval 
letter must specifically refer to this AD.

 (k) New Part Identification

    For airplanes having serial numbers 60-001 through 60-409 
inclusive: Within 25 flight hours after the effective date of this 
AD, inspect the fuel crossflow tube to determine whether P/N 
6026020-005 is installed. In lieu of inspecting the tube, a review 
of airplane maintenance records is acceptable if the part number of 
the tube can be positively determined from that review.

(l) New Clearance Measurement

    If P/N 6026020-005 is found installed during the inspection 
required by paragraph (k) of this AD, before further flight, measure 
the clearance between the fuel crossflow tube and both elevator 
control cables to determine if it is 0.35 inch or more, in 
accordance with paragraph 2.A.(9) of the Accomplishment Instructions 
of Bombardier Service Bulletin 60-28-4, Revision 2, dated August 22, 
2001.
    (1) If the clearance is 0.35 inch or more, no further action is 
required by this paragraph.
    (2) If the clearance is less than 0.35 inch, before further 
flight, adjust the fit of the P/N 6026020-005 tube to provide 0.35 
inch or more clearance to both elevator control cables, in 
accordance with paragraph 2.A.(9) of the Accomplishment Instructions 
of Bombardier Service Bulletin 60-28-4, Revision 2, dated August 22, 
2001. If the tube shows any indication of chafing from the control 
cables, before further flight, replace the fuel crossflow tube with 
a new fuel crossflow tube, in accordance with paragraph 2.A.(9) of 
the Accomplishment Instructions of Bombardier Service Bulletin 60-
28-4, Revision 2, dated August 22, 2001.

(m) New Repetitive Measurements

    For all airplanes: As of the effective date of this AD and after 
accomplishing the inspection required by paragraph (g) or (k) of 
this AD, as applicable: Before further flight after removal, 
replacement, or adjustment of any crossflow tube, fuel crossflow 
drain valve, fuel crossflow valve or related plumbing and fittings, 
and elevator control cable, measure the clearance between the fuel 
crossflow tube and the flight control cables, in accordance with 
paragraph 2.A.(9) of the Accomplishment Instructions of Bombardier 
Service Bulletin 60-28-4, Revision 2, dated August 22, 2001.
    (1) If the clearance is 0.35 inch or more, no further action is 
required by this paragraph.
    (2) If the clearance is less than 0.35 inch, before further 
flight, adjust the fit of the P/N 6026020-005 tube to provide 0.35 
inch or more clearance to both elevator control cables, in 
accordance with paragraph 2.A.(9) of the Accomplishment Instructions 
of Bombardier Service Bulletin 60-28-4, Revision 2, dated August 22, 
2001.

(n) Reporting Requirement

    Submit a report of the findings of the initial measurement 
required by paragraph (l) of this AD to the Wichita Manufacturing 
Inspection District Office, 2204 South Tyler Road, Wichita, KS 
67209-3001, at the applicable time specified in paragraph (n)(1) or 
(n)(2) of this AD. The report must include the airplane 
registration, serial number, the total time in service, and the 
measured clearance found between the fuel crossflow tube and the 
elevator control cables after the initial inspection.
    (1) If the inspection was done on or after the effective date of 
this AD: Submit the report within 30 days after the inspection.
    (2) If the inspection was done before the effective date of this 
AD: Submit the report within 30 days after the effective date of 
this AD.

(o) Part Installation Prohibition

    As of the effective date of AD, only fuel crossflow tubes having 
P/N 6026020-005 may be installed on any airplane.

(p) Paperwork Reduction Act Burden Statement

    A federal agency may not conduct or sponsor, and a person is not 
required to respond to, nor shall a person be subject to a penalty 
for failure to comply with a collection of information subject to 
the requirements of the Paperwork Reduction Act unless that 
collection of information displays a current valid OMB Control 
Number. The OMB Control Number for this information collection is 
2120-0056. Public reporting for this collection of information is 
estimated to be approximately 5 minutes per response, including the 
time for reviewing instructions, completing and reviewing the 
collection of information. All responses to this collection of 
information are mandatory. Comments concerning the accuracy of this 
burden and suggestions for reducing the burden should be directed to 
the FAA at: 800 Independence Ave. SW., Washington, DC 20591, Attn: 
Information Collection Clearance Officer, AES-200.

(q) Alternative Methods of Compliance (AMOCs)

    (1) The Manager, Wichita 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 paragraph 
(r) of this AD.
    (2) Before using any approved AMOC, notify your appropriate 
principal inspector, or lacking a principal inspector, the manager 
of the local flight standards district office/certificate holding 
district office.

(r) Related Information

    For more information about this AD, contact Jeff Janusz, 
Aerospace Engineer, Propulsion Branch, ACE-116W, FAA, Wichita ACO, 
1801 Airport Road, Room 100, Wichita, KS 67209; phone: 316-946-4148; 
fax: 316-946-4107; email: [email protected].

(s) Material Incorporated by Reference

    (1) The Director of the Federal Register approved the 
incorporation by reference (IBR) of the service information listed 
in this

[[Page 7377]]

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.
    (3) The following service information was approved for IBR on 
November 3, 2003 (68 FR 55812, September 29, 2003).
    (i) Bombardier Alert Service Bulletin A60-28-3, Revision 2, 
dated October 26, 1998.
    (ii) Bombardier Service Bulletin 60-28-4, Revision 2, dated 
August 22, 2001.
    (4) For service information identified in this AD, contact 
Learjet, Inc., One Learjet Way, Wichita, KS 67209-2942; telephone 
316-946-2000; fax 316-946-2220; email [email protected]; 
Internet http://www.bombardier.com.
    (5) 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.
    (6) 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 December 27, 2013.
Jeffrey E. Duven,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2014-02464 Filed 2-6-14; 8:45 am]
BILLING CODE 4910-13-P

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