Airworthiness Directive

ID: 2017-20-06
Issue date: 2017-10-05
Effective date: 2017-11-09  
Subject: Turbine Section
Source: FAA
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Honeywell International Inc. Turbofan Engines

[Federal Register Volume 82, Number 192 (Thursday, October 5, 2017)]
[Rules and Regulations]
[Pages 46379-46382]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2017-21285]

––––––––––––––––––––––––––––––––––

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2017-0034; Product Identifier 2016-NE-32-AD; Amendment 39-19063; AD
2017-20-06]

RIN 2120-AA64

Airworthiness Directives; Honeywell International Inc. Turbofan Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

––––––––––––––––––––––––––––––––––

Summary:
We are adopting a new airworthiness directive (AD) for certain Honeywell
International Inc. (Honeywell) AS907-1-1A turbofan engines. This AD was prompted by reports of
loss of power due to failure of the second stage low-pressure turbine (LPT2) blade. This AD requires
a one-time inspection of the LPT2 blades and, if the blades fail the inspection, the replacement of the
blades with a part eligible for installation. We are issuing this AD to address the unsafe condition on
these products.

Dates:
This AD is effective November 9, 2017.
The Director of the Federal Register approved the incorporation by reference of a certain
publication listed in this AD as of November 9, 2017.

Addresses:
For service information identified in this final rule, contact Honeywell International
Inc., 111 S 34th Street, Phoenix, AZ 85034-2802; phone: 800-601-3099; Internet:
https://myaerospace.honeywell.com/wps/portal. You may view this service information at the FAA,
Engine and Propeller Standards Branch, 1200 District Avenue, Burlington, MA 01803. For
information on the availability of this material at the FAA, call (781) 238-7125. It is also available on
the internet at http://www.regulations.gov by searching for and locating Docket No. FAA-2017-0034.

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-2017-0034; 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 final
rule, the regulatory evaluation, any comments received, and other information. The address for the
Docket Office (phone: 800-647-5527) is Document Management Facility, U.S. Department of

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Transportation, Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New
Jersey Avenue SE., Washington, DC 20590.

FOR FURTHER INFORMATION CONTACT: Joseph Costa, Aerospace Engineer, Los Angeles
ACO Branch, FAA, 3960 Paramount Blvd., Lakewood, CA 90712-4137; phone: 562-627-5246; fax:
562-627-5210; email: joseph.costa@faa.gov.

SUPPLEMENTARY INFORMATION:

Discussion

We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 by adding an AD
that would apply to certain Honeywell International Inc. (Honeywell) AS907-1-1A turbofan engines.
The NPRM published in the Federal Register on June 20, 2017 (82 FR 28028). The NPRM was
prompted by reports of loss of power due to failure of the second stage LPT2 blade from high-cycle
fatigue in the blade's dovetail region. The NPRM proposed to require a one-time inspection of the
LPT2 blades and, if the blades fail the inspection, the replacement of the blades with a part eligible
for installation. We are issuing this AD to prevent failure of the LPT2 blades, failure of one or more
engines, and loss of the airplane.

Comments

We gave the public the opportunity to participate in developing this final rule. We received no
comments on the NPRM 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 final rule as proposed except for minor editorial changes. We have determined that
these minor changes:
• Are consistent with the intent that was proposed in the NPRM for correcting the unsafe
condition; and
• Do not add any additional burden upon the public than was already proposed in the NPRM.

Related Service Information Under 1 CFR Part 51

We reviewed Honeywell Service Bulletin (SB) AS907-72-9067, Revision 1, dated March 20,
2017. This SB describes procedures for inspecting the LPT2 blades. This service information is
reasonably available because the interested parties have access to it through their normal course of
business or by the means identified in the ADDRESSES section.

Other Related Service Information

We reviewed Honeywell SB AS907-72-9067, Revision 0, dated December 12, 2016, which also
describes procedures for inspecting the LPT2 blades. We also reviewed the Honeywell Light
Maintenance Manual, AS907-1-1A, 72-00-00, Section 72-05-12, dated May 25, 2016, and Section
72-55-03, dated September 27, 2011, which provide additional guidance for performing borescope
inspections.

Costs of Compliance

We estimate that this AD affects 40 engines installed on airplanes of U.S. registry.
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We estimate the following costs to comply with this AD:

Estimated Costs
Action Labor cost Parts Cost per Cost on U.S.
cost product operators
Borescope inspection 10 work-hours × $85 per $0 $850 $34,000
hour = $850
Report results of 1 work-hour × $85 per hour 0 85 3,400
inspection = $85

We estimate the following costs to do any necessary replacements that would be required based
on the results of the inspection. We estimate that 40 engines will need this replacement.

On-Condition Costs
Action Labor cost Parts Cost per
cost product
Replacement of the LPT2 blade 50 work-hours × $85 per hour = $50,000 $54,250
set $4,250

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.
This AD is issued in accordance with authority delegated by the Executive Director, Aircraft
Certification Service, as authorized by FAA Order 8000.51C. In accordance with that order, issuance
of ADs is normally a function of the Compliance and Airworthiness Division, but during this
transition period, the Executive Director has delegated the authority to issue ADs applicable to


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engines, propellers, and associated appliances to the Manager, Engine and Propeller Standards
Branch, Policy and Innovation Division.

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 to the extent that it justifies making a regulatory
distinction, 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.

§ 39.13 [Amended]

2. The FAA amends § 39.13 by adding the following new airworthiness directive (AD):




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AIRWORTHINESS
FAA DIRECTIVE
Aviation Safety
www.faa.gov/aircraft/safety/alerts/
www.gpoaccess.gov/fr/advanced.html


2017-20-06 Honeywell International Inc.: Amendment 39-19063; Docket No. FAA-2017-0034;
Product Identifier 2016-NE-32-AD.

(a) Effective Date

This AD is effective November 9, 2017.

(b) Affected ADs

None.

(c) Applicability

This AD applies to Honeywell International Inc. (Honeywell) AS907-1-1A turbofan engines
with second stage low-pressure turbine (LPT2) rotor blades, part number (P/N) 3035602-1, installed.

(d) Subject

Joint Aircraft System Component (JASC) Code 7250, Turbine Section.

(e) Unsafe Condition

This AD was prompted by reports of loss of power due to failure of the LPT2 blade. We are
issuing this AD to prevent failure of the LPT2 blades, failure of one or more engines, and loss of the
airplane.

(f) Compliance

Comply with this AD within the compliance times specified, unless already done.
(1) For LPT2 rotor blades, P/N 3035602-1 that have more than 8,000 hours since new on the
effective date of this AD, perform a one-time borescope inspection for wear of the Z gap contact area
at the blade tip shroud for each of the 62 LPT2 rotor blades within 200 hours time in service after the
effective date of this AD.
(2) Use the Accomplishment Instructions, Paragraph 3.B.(1), of Honeywell Service Bulletin (SB)
AS907-72-9067, Revision 1, dated March 20, 2017, to do the inspection.
(3) If the measured wear and/or fretting of any Z gap contact area is greater than 0.005 inch,
replace the LPT2 rotor assembly with a part eligible for installation before further flight.
(4) Do the following actions within 200 hours time in service after the effective date of this AD:
(i) Using a borescope make a clear digital image of the Z gap contact area at the blade tip shroud
of the 62 LPT2 rotor blades.
(ii) Identify the three Z gap contact areas with the greatest amount of wear and/or fretting.
(iii) Record the blade position on the LPT2 rotor assembly and the measured wear of the three Z
gap contact areas with the greatest amount of wear and/or fretting.


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(iv) Send the results to Honeywell at engine.reliability@honeywell.com within 30 days after
completing these actions.

(g) Credit for Previous Actions

You may take credit for the actions required by paragraphs (f)(1) and (4) of this AD, if you
performed these actions before the effective date of this AD using Honeywell SB AS907-72-9067,
Revision 0, dated December 12, 2016.

(h) 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.

(i) Alternative Methods of Compliance (AMOCs)

(1) The Manager, Los Angeles ACO Branch, FAA, may 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 Los Angeles ACO Branch, send it to the attention of the
person identified in paragraph (j) 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.

(j) Related Information

For more information about this AD, contact Joseph Costa, Aerospace Engineer, Los Angeles
ACO Branch, FAA, 3960 Paramount Blvd., Lakewood, CA 90712-4137; phone: 562-627-5246; fax:
562-627-5210; email: joseph.costa@faa.gov.

(k) 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) Honeywell Service Bulletin AS907-72-9067, Revision 1, dated March 20, 2017.
(ii) Reserved.
(3) For Honeywell service information identified in this AD, contact Honeywell International
Inc., 111 S 34th Street, Phoenix, AZ 85034-2802; phone: 800-601-3099; Internet:
https://myaerospace.honeywell.com/wps/portal.



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(4) You may view this service information at FAA, Engine and Propeller Standards Branch,
1200 District Avenue, Burlington, MA. For information on the availability of this material at the
FAA, call 781-238-7125.
(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 Burlington, Massachusetts, on September 22, 2017.
Robert J. Ganley,
Manager, Engine and Propeller Standards Branch,
Aircraft Certification Service.




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This is a partial extract of the full document - please refer to the actual report for full information.
Sources as credited.