
[Federal Register: September 27, 2010 (Volume 75, Number 186)]
[Rules and Regulations]               
[Page 59067-59071]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr27se10-8]                         

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2009-1100; Directorate Identifier 2009-NE-37-AD; 
Amendment 39-16441; AD 2010-20-07]
RIN 2120-AA64

 
Airworthiness Directives; International Aero Engines AG V2500-A1, 
V2522-A5, V2524-A5, V2525-D5, V2527-A5, V2527E-A5, V2527M-A5, V2528-D5, 
V2530-A5, and V2533-A5 Turbofan Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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SUMMARY: The FAA is adopting a new airworthiness directive (AD) for all 
International Aero Engines AG (IAE) V2500-A1, V2525-D5 and V2528-D5 
turbofan engines and certain serial numbers (S/Ns) of IAE V2522-A5, 
V2524-A5, V2527-A5, V2527E-A5, V2527M-A5, V2530-A5, and V2533-A5 
turbofan engines. For certain S/Ns of V2500-A1, V2522-A5, V2524-A5, 
V2527-A5, V2527E-A5, V2527M-A5, V2530-A5, and V2533-A5 series turbofan 
engines, this AD requires initial and repetitive on-wing ultrasonic 
inspections of the high-pressure compressor (HPC) stage 3 to 8 drum for 
cracks. As mandatory terminating action to the repetitive inspections, 
this AD requires removal from service of the fully silver plated nuts 
attaching the HPC stage 3 to 8 drum to the HPC stage 9 to 12 drum, 
removal of silver residue from the HPC stage 3 to 8 drum, and 
fluorescent penetrant inspection (FPI) of the stage 3 to 8 drum within 
a specified time. For all other engines, this AD requires removal from 
service of the fully silver plated nuts attaching the HPC stage 3 to 8 
drum to the HPC stage 9 to 12 drum, removal of silver residue from the 
HPC stage 3 to 8 drum, and FPI of the HPC stage 3 to 8 drum at the next 
drum piece-part exposure. This AD results from reports of 39 HPC stage 
3 to 8 drums found cracked since March 2009. We are issuing this AD to 
prevent uncontained failure of the HPC stage 3 to 8 drum, which could 
result in damage to the airplane.

DATES: This AD becomes effective November 1, 2010. The Director of the 
Federal Register approved the incorporation by reference of certain 
publications listed in the regulations as of November 1, 2010.

ADDRESSES: You can get the service information identified in this AD 
from

[[Page 59068]]

International Aero Engines AG, 400 Main Street, East Hartford, CT 
06108; telephone: (860) 565-5515; fax: (860) 565-5510.
    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: Mark Riley, Aerospace Engineer, Engine 
Certification Office, FAA, Engine and Propeller Directorate, 12 New 
England Executive Park, Burlington, MA 01803; e-mail: 
mark.riley@faa.gov; telephone (781) 238-7758, fax (781) 238-7199.

SUPPLEMENTARY INFORMATION: The FAA proposed to amend 14 CFR part 39 
with a proposed AD. The proposed AD applies to all IAE V2500-A1, V2525-
D5 and V2528-D5 turbofan engines and certain S/Ns of IAE V2522-A5, 
V2524-A5, V2527-A5, V2527E-A5, V2527M-A5, V2530-A5, and V2533-A5 
turbofan engines. We published the proposed AD in the Federal Register 
on February 12, 2010 (75 FR 6860). That action proposed to require:
     For certain S/Ns of IAE V2500-A1, V2522-A5, V2524-A5, 
V2527-A5, V2527E-A5, V2527M-A5, V2530-A5, and V2533-A5 turbofan 
engines:
    [cir] Initial and repetitive on-wing ultrasonic inspections of HPC 
stage 3 to 8 drums for cracks; and
    [cir] As mandatory terminating action to the repetitive ultrasonic 
inspections, within 27 months from the effective date of this AD, 
removal from service of the fully silver plated nuts attaching the HPC 
stage 3 to 8 drum to the HPC stage 9 to 12 drum, removal of silver 
residue from the HPC stage 3 to 8 drums, and FPI of the HPC stage 3 to 
8 drums.
     For all other engines, at the next piece-part exposure of 
the HPC stage 3 to 8 drum, removal from service of the fully silver 
plated nuts attaching the HPC stage 3 to 8 drum to the HPC stage 9 to 
12 drum, removal of silver residue from the HPC stage 3 to 8 drums, and 
FPI of the HPC stage 3 to 8 drums.

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 AD, the regulatory evaluation, 
any comments received, and other information. The street address for 
the Docket Operations office (telephone (800) 647-5527) is provided in 
the ADDRESSES section. Comments will be available in the AD docket 
shortly after receipt.

Comments

    We provided the public the opportunity to participate in the 
development of this AD. We have considered the comments received.

Request To Mandate Inspection of Group B and Group C Engines

    One commenter, Airbus, requests that we mandate inspection for the 
S/N engines identified in Group B and Group C of IAE Service Bulletin 
(SB) No. V2500-ENG-72-0594, Revision 5, as these engines may have 
operated in a similar environment as the Group A engines.
    We do not agree. Engines identified in Groups B and C have not 
exhibited cracking similar to that seen in engines listed in Groups A 
and D. Therefore, it is not appropriate to mandate inspections on Group 
B or C engines at this time. We did not change the AD.

Claim That Root Cause Is Not Yet Determined

    Airbus claims that the proposed AD would mandate the inspection 
only on engines identified in IAE SB No. V2500-ENG-72-0594 (Groups A 
and D) and IAE SB No. V2500-ENG-72-0603 (Group A) without determining 
root cause. To properly identify the suspect population, determining 
the root cause of the HPC stage 3-8 drum cracking is required.
    We do not agree. While we do not yet know the specific root cause 
of the contamination causing the corrosion cracking of the HPC stage 3-
8 drum, we do know that engines specified in IAE SB No. V2500-ENG-72-
0594 (Groups A and D) and IAE SB No. V2500-ENG-72-0603 (Group A) may 
exhibit HPC stage 3-8 drum corrosion cracking. We did not change the 
AD.

Request To Include a Fleetwide Introduction of a Final Fix

    Airbus requests that the proposed AD should include a fleet-wide 
introduction of the final fix (nuts modification), and in the interim, 
the ultrasonic inspection, to correct the cause of HPC stage 3-8 drum 
cracking for the entire V2500 fleet.
    We partially agree. Paragraph (f)(4)(i) of this AD requires that 
all operators of engines requiring these repetitive ultrasonic 
inspections remove the fully silver plated nuts, P/N AS44862, or 
equivalent, that attach the HPC stage 3 to 8 drum to the HPC stage 9 to 
12 drum, within 27 months after the effective date of the AD. Paragraph 
(g) of this AD also requires those operators of all other affected 
engines to remove the fully silver plated nuts at the next piece-part 
exposure of the HPC stage 3-8 drum after the effective date of the AD. 
Ultrasonic inspection(s) per IAE SB No. V2500-ENG-72-0594 (Groups A and 
D) and IAE SB No. V2500-ENG-72-0603 only affect certain engines and are 
not required for the entire fleet. We did not change the AD.

Claim That Proposed AD Is Less Restrictive Than IAE SB

    Airbus claims that the proposed AD is less restrictive than the IAE 
service bulletins, and it does not recommend immediate action for 
V2500-A5 drums above 7,545 cycles-since-new and for V2500-A1 drums 
above 10,305 cycles-since-new. It therefore does not meet the criteria 
for maximum allowable individual risk per flight.
    We do not agree. All ``high cycle'' HPC stage 3 to 8 drums in the 
field that required inspections at reduced thresholds, as referenced in 
the IAE SBs, have already been inspected. Therefore, an equivalent 
level of fleet risk is maintained for the AD action, and meets FAA 
criteria. We did not change the AD.

FAA Should Mandate the Nut Removal for the Complete V2500 Fleet

    Airbus states that the proposed AD does not put a compliance date 
for removal of the fully plated silver nuts for the complete V2500 
fleet. Removal of the fully silver plated nuts should be mandated for 
the complete V2500 fleet.
    We agree that the fully silver plated nuts should be removed from 
service for the entire V2500 fleet. However, all engines do not need to 
be retrofitted before a specific compliance date. V2500 engines that 
have been determined to require repetitive ultrasonic inspections are 
at an elevated risk level, and therefore require removal of the fully 
silver plated nuts within a specified time period to prevent corrosion 
and potential failure of the HPC 3-8 drum. The remaining V2500 engines 
that do not require repetitive ultrasonic inspections have been 
determined to be at a much lower risk level, and therefore, are only 
required to have the fully silver plated nuts removed at the next piece 
part exposure. We did not change the AD.

Request To Reference the Latest Service Bulletins

    IAE and Japan Airlines request that we reference the latest 
revisions of the service bulletins, which are IAE SB No. V2500-ENG-72-
0594, Revision 6, IAE SB No. V2500-ENG-72-0603, Revision 2, and V2500-
ENG-72-0601, Revision 2, as they have been updated to include 
additional engine S/Ns and other clarification changes.
    We agree. We changed the AD to reference the revised service 
bulletins.

[[Page 59069]]

Request To Correct Typos in the Proposed AD

    Two commenters request that we change the following:
    Paragraph (f)(4) should be revised from ``HPC Stage 8 to 12 drum'' 
to ``HPC Stage 3 to 8 drum''.
    Paragraphs (f)(1), (f)(4)(ii), and (g)(2) should be revised from 
``using paragraph 3 of the Accomplishment Instructions of'' to ``using 
the paragraph 3 Accomplishment Instructions of''.
    We partially agree. We agree that paragraph (f)(4) should be 
revised from ``HPC Stage 8 to 12 drum'' to ``HPC Stage 3 to 8 drum,'' 
We changed the AD.
    We also agree that our reference in paragraphs (f)(1), (f)(4)(ii), 
and (g)(2) should be revised, but not as recommended. We changed 
paragraphs (f)(1), (f)(4)(ii), and (g)(2) from ``using paragraph 3 of 
the Accomplishment Instructions of'' to ``use IAE SB No. V2500-ENG-72-
0601, Revision 2, dated April 12, 2010, Accomplishment Instructions, 
paragraph 3.''

Material Incorporated by Reference Section Missing From Proposed AD

    One commenter states that paragraphs (f)(1), (f)(4)(ii), and (g)(2) 
require ultrasonic inspection and cleaning to be performed using the 
Accomplishment Instructions of specified revisions of IAE SBs V2500-
ENG-72-0594, V2500-ENG-603, and V2500-ENG-72-0601. These SBs should be 
listed in the Material Incorporated by Reference section, which is 
missing from the NPRM.
    We agree. This Final Rule AD includes the Material Incorporated by 
Reference section, which includes those SBs.

Request To Revise the Relevant Service Information

    IAE commented to revise the last sentence of the ``Relevant Service 
Information'' in the preamble of the AD to change: ``* * * 27 months 
from the effective date of the proposed AD'' to ``27 months after the 
effective date of this AD''. The commenter states that this could be 
interpreted incorrectly as 27 months from February 12, 2010 (date of 
the NPRM).
    We do not agree that the compliance date could be misinterpreted. 
Paragraph (4) of this AD correctly states ``27 months after the 
effective date of this AD.'' We did not change the AD.

Request To Revise the Mandatory Terminating Action Compliance Time

    IAE requests that we revise the mandatory terminating action 
compliance time of ``27 months after the effective date of this AD'' to 
a calendar end date of October 31, 2012, to be consistent with the IAE 
risk assessment.
    We do not agree. Due to the uncertainty of the actual publication 
date of the AD, revising the mandatory terminating action from 27 
months after the effective date of this AD to a calendar date of 
October 31, 2012, may result in a compliance time that is more 
restrictive than what was proposed in the NPRM. We did not change the 
AD.

Request To Revise the Definition of Piece-Part Exposure

    IAE requests that we revise the AD to change paragraph (i) of the 
definition of piece-part exposure for the HPC stage 3 to 8 drum from 
``removal of the drum from the engine and removal of all blades from 
the drum'' to ``separation of the rotating drum hardware from the 
static cases and removal of all blades from the HPC stage 3 to 8 
drum''. IAE is concerned that confusion could occur with the current 
statement.
    We do not agree. The current description is accurate. We did not 
change the AD.

Request To Eliminate the Mandatory Terminating Action

    One commenter requests that we revise paragraph (f)(4) of the AD to 
eliminate the 27-month mandatory terminating action requirement to 
remove the fully silver plated nuts that attach the HPC stage 3 to 8 
drum to the HPC stage 9 to 12 drum. The commenter states that 
performing repetitive ultrasonic inspections will provide an acceptable 
level of safety, and that incorporation of the 27-month mandatory 
terminating action requirement is an unacceptable cost burden to 
operators.
    We do not agree. We have determined that removal of the fully 
silver plated nuts within 27 months from the effective date of the AD 
is required to maintain an acceptable level of safety. We did not 
change the AD.

Conclusion

    We have carefully reviewed the available data, including the 
comments received, and determined that air safety and the public 
interest require adopting the AD with the changes described previously. 
We have determined that these changes will neither increase the 
economic burden on any operator nor increase the scope of the AD.

Costs of Compliance

    We estimate that this AD will affect 848 IAE V2500-A1, V2522-A5, 
V2524-A5, V2525-D5, V2527-A5, V2527E-A5, V2527M-A5, V2528-D5, V2530-A5, 
and V2533-A5 turbofan engines installed on airplanes of U.S. registry. 
We estimate that 29 of these engines will require ultrasonic 
inspections, and that it will take about 3 work-hours per engine to 
perform one ultrasonic inspection. We estimate that it will take about 
2 work-hours per engine to perform the FPI of the HPC stage 3 to 8 
drum, and that the average labor rate is $85 per work-hour. We also 
estimate that removal of silver residue from the engine will cost about 
$2,600 per engine. Required parts will cost about $795 per engine. 
Based on these figures, we estimate the total cost of the AD to U.S. 
operators to be $3,030,515.

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); and
    (3) Will not have a significant economic impact, positive or 
negative, on a substantial number of small entities under the criteria 
of the Regulatory Flexibility Act.
    We prepared a summary of the costs to comply with this AD and 
placed it in the AD Docket. You may get a copy of this summary at the 
address listed under ADDRESSES.

[[Page 59070]]

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 Federal Aviation Administration 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 airworthiness 
directive:

2010-20-07 International Aero Engines AG: Amendment 39-16441. Docket 
No. FAA-2009-1100; Directorate Identifier 2009-NE-37-AD.

Effective Date

    (a) This airworthiness directive (AD) becomes effective November 
1, 2010.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to:
    (1) All International Aero Engines AG (IAE) V2500-A1 turbofan 
engines; and
    (2) All IAE V2525-D5 and V2528-D5 turbofan engines; and
    (3) IAE V2522-A5, V2524-A5, V2527-A5, V2527E-A5, V2527M-A5, 
V2530-A5, and V2533-A5 turbofan engines with serial numbers (S/Ns) 
up to and including V13181, and with S/Ns from V15000 up to and 
including V15245.
    (4) These engines are installed on, but not limited to, Airbus 
A319, A320, and A321, and McDonnell Douglas MD-90 airplanes.

Unsafe Condition

    (d) This AD results from reports of 39 high-pressure compressor 
(HPC) stage 3 to 8 drums found cracked since March 2009. We are 
issuing this AD to prevent uncontained failure of the HPC stage 3 to 
8 drum, which could result in damage to the airplane.

Compliance

    (e) You are responsible for having the actions required by this 
AD performed within the compliance times specified unless the 
actions have already been done.

Engines Requiring Ultrasonic Inspections of the HPC Stage 3 to 8 Drum

    (f) For IAE V2522-A5, V2524-A5, V2527-A5, V2527E-A5, V2527M-A5, 
V2530-A5, and V2533-A5 turbofan engines with S/Ns in ``Group A'' or 
``Group D'' in IAE Service Bulletin (SB) No. V2500-ENG-72-0594, 
Revision 6, dated April 12, 2010, and for V2500-A1 turbofan engines 
with S/Ns in ``Group A'' in IAE SB No. V2500-ENG-72-0603, Revision 
2, dated March 17, 2010, do the following:
    (1) Perform an initial ultrasonic inspection of the HPC stage 3 
to 8 drum using IAE SB No. V2500-ENG-72-0594, Revision 6, dated 
April 12, 2010, Accomplishment Instructions, paragraph 3, or IAE SB 
No. V2500-ENG-72-0603, Revision 2, dated March 17, 2010, 
Accomplishment Instructions, paragraph 3, before accumulating 5,200 
cycles-since-new (CSN) or within 500 cycles from the effective date 
of this AD, whichever occurs later.
    (2) Thereafter, perform repetitive ultrasonic inspections of the 
HPC stage 3 to 8 drum for cracks within every 500 cycles-since-last-
inspection.
    (3) If cracks or crack indications are identified, remove the 
drum from service before further flight.

Mandatory Terminating Action

    (4) As mandatory terminating action to the repetitive 
inspections required by this AD, at the next engine shop visit, but 
no later than 27 months after the effective date of this AD, do the 
following before returning any HPC stage 3 to 8 drum to service:
    (i) Remove from service fully silver plated nuts, part number 
(P/N) AS44862 or equivalent, that attach the HPC stage 3 to 8 drum 
to the HPC stage 9 to 12 drum.
    (ii) Remove the silver residue from the HPC stage 3 to 8 drum 
using the IAE SB No. V2500-ENG-72-0601, Revision 2, dated April 12, 
2010, Accomplishment Instructions, paragraph 3. Drums cleaned before 
the effective date of this AD using engine manual task 72-41-11-110-
001 satisfy this requirement.
    (iii) Fluorescent penetrant inspect (FPI) the HPC stage 3 to 8 
drum for cracks, and remove from service any drum found cracked. You 
can find guidance on performing an FPI of the HPC stage 3 to 8 drum 
in IAE engine manual task 72-41-11-200-001.
    (iv) Installation of a zero-time HPC stage 3 to 8 drum or a drum 
that has never operated with fully silver plated nuts, P/N AS44862 
or equivalent, that attach the HPC stage 3 to 8 drum to the HPC 
stage 9 to 12 drum eliminates the need for the cleaning and FPI 
required by paragraphs (f)(4)(ii) and (f)(4)(iii) of this AD.

All Other Engines

    (g) For all other engines, at the next piece-part exposure of 
the HPC stage 3 to 8 drum after the effective date of this AD, do 
the following before returning the drum to service:
    (1) Remove from service fully silver plated nuts, P/N AS44862 or 
equivalent, that attach the HPC stage 3 to 8 drum to the HPC stage 9 
to 12 drum.
    (2) Remove the silver residue from the HPC stage 3 to 8 drum 
using IAE SB No. V2500-ENG-72-0601, Revision 2, dated April 12, 
2010, Accomplishment Instructions, paragraph 3. Drums cleaned before 
the effective date of this AD using engine manual task 72-41-11-110-
001 satisfy this requirement.
    (3) FPI the HPC stage 3 to 8 drum for cracks, and remove from 
service any drum found cracked. You can find guidance on performing 
an FPI of the HPC stage 3 to 8 drum in IAE engine manual task 72-41-
11-200-001.
    (4) Installation of a zero-time HPC stage 3 to 8 drum or a drum 
that has never operated with fully silver plated nuts, P/N AS44862 
or equivalent, that attach the HPC stage 3 to 8 drum to the HPC 
stage 9 to 12 drum eliminates the need for the cleaning and FPI 
required by paragraphs (g)(2) and (g)(3) of this AD.

Definitions

    (h) For the purpose of this AD, an engine shop visit is the 
induction of an engine into the shop for maintenance involving the 
separation of a pair of major mating engine flanges, except that the 
separation of engine flanges solely for the purposes of 
transportation without subsequent engine maintenance is not an 
engine shop visit.
    (i) For the purpose of this AD, piece-part exposure is removal 
of the HPC stage 3 to 8 drum from the engine and removal of all 
blades from the drum.

Previous Credit

    (j) Initial or repetitive ultrasonic inspections of the HPC 
stage 3 to 8 drum using IAE SB No. V2500-ENG-72-0594, Revision 3, 
dated August 7, 2009, or Revision 4, dated October 13, 2009, or 
Revision 5, dated November 23, 2009, before the effective date of 
this AD, meets the inspection requirements of paragraphs (f)(1) 
through (f)(3) of this AD.
    (k) Initial or repetitive ultrasonic inspections of the HPC 
stage 3 to 8 drum using IAE SB No. V2500-ENG-72-0603, Original 
Issue, dated November 24 2009, or Revision 1, dated December 18, 
2009, before the effective date of this AD, meets the inspection 
requirements of paragraphs (f)(1) through (f)(3) of this AD.

Alternative Methods of Compliance (AMOCS)

    (l) The Manager, Engine Certification Office, has the authority 
to approve AMOCs for this AD if requested using the procedures found 
in 14 CFR 39.19.

Related Information

    (m) Contact Mark Riley, Aerospace Engineer, Engine Certification 
Office, FAA, Engine and Propeller Directorate, 12 New England 
Executive Park, Burlington, MA 01803; e-mail: mark.riley@faa.gov; 
telephone (781) 238-7758, fax (781) 238-7199, for more information 
about this AD.
    (n) Contact International Aero Engines AG, 400 Main Street, East 
Hartford, CT 06108; telephone: (860) 565-5515; fax: (860) 565-5510, 
for a copy of the service information referenced in this AD.

Material Incorporated by Reference

    (o) You must use the service information specified in the 
following Table 1 to perform the inspections and silver residue 
removal required by this AD. The Director of the Federal Register 
approved the incorporation by reference of the documents listed in 
the following Table 1 in accordance with 5 U.S.C. 552(a) and 1 CFR 
part 51. Contact International Aero Engines AG, 400 Main Street, 
East Hartford, CT 06108; telephone:

[[Page 59071]]

(860) 565-5515; fax: (860) 565-5510, for a copy of this service 
information. You may review copies at the FAA, New England Region, 
12 New England Executive Park, Burlington, MA; or 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.

                                       Table 1--Incorporation by Reference
----------------------------------------------------------------------------------------------------------------
   International Aero Engines Service
              Bulletin No.                        Page            Revision                   Date
----------------------------------------------------------------------------------------------------------------
V2500-ENG-72-0594......................  ALL..................            6  April 12, 2010.
    Total Pages: 61....................
V2500-ENG-72-0601......................  ALL..................            2  April 12, 2010.
    Total Pages: 9.....................
V2500-ENG-72-0603......................  ALL..................            2  March 17, 2010.
    Total pages: 46....................
----------------------------------------------------------------------------------------------------------------


    Issued in Burlington, Massachusetts, on September 15, 2010.
Robert J. Ganley,
Acting Manager, Engine and Propeller Directorate, Aircraft 
Certification Service.
[FR Doc. 2010-23832 Filed 9-24-10; 8:45 am]
BILLING CODE 4910-13-P

