HONEYWELL INTERNATIONAL INC.TFE731-20/-40/-50/-60

ID: US-2017-20-01
Issue date: 2017-09-29
Effective date: 2017-11-02
Source: FAA
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Turbine Engine Compressor Section - Fan Disks - Removal / Replacement

[Federal Register Volume 82, Number 187 (Thursday, September 28, 2017)]
[Rules and Regulations]
[Pages 45173-45175]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2017-20776]

––––––––––––––––––––––––––––––––––

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2016-9451; Product Identifier 2016-NE-24-AD; Amendment 39-19058; AD
2017-20-01]

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 all Honeywell International
Inc. (Honeywell) TFE731-20 and TFE731-40 turbofan engines. This AD was prompted by two fan
disks found with a manufacturing-caused flaw. This AD requires removing affected fan disks and
replacing fan disks 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 2, 2017.
The Director of the Federal Register approved the incorporation by reference of a certain
publication listed in this AD as of November 2, 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-2016-9451.

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-2016-9451; 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 all Honeywell TFE731-20 and TFE731-40 turbofan engines. The NPRM
published in the Federal Register on March 7, 2017 (82 FR 12755). The NPRM was prompted by two
fan disks found with a manufacturing-caused flaw. The NPRM proposed to require removing the
affected fan disks, performing a one-time inspection, and replacing fan disks that fail inspection. We
are issuing this AD to prevent uncontained failure of the fan disks, damage to the engine, and damage
to the airplane.

Comments

We gave the public the opportunity to participate in developing this final rule. We have
considered the comment received.

Miscellaneous Comment

We received a comment regarding Honeywell as a company that was not relevant to this AD. No
further discussion is required.

Changes to This AD

Based on further review, we made the following changes to this AD.
We corrected the cost per product estimate under “On-condition costs” in the Costs of
Compliance section of the NPRM from $300,510 to $50,085 in this AD. The cost per product in the
NPRM incorrectly estimated the cost for six engines rather than for one engine. On further review,
we also redefined the work hours needed to install the new or reworked fan disk. The 8 work hours to
inspect the fan disk were listed as a separate item in the NPRM but, in this final rule, we added these
work hours to the estimated cost of installing the reworked or new fan disk. The overall estimated
cost of this work per engine remains the same.
We corrected the product identification from “Honeywell International Inc. (Type Certificate
previously held by AlliedSignal Inc., Garrett Engine Division; Garrett Turbine Engine Company; and
AiResearch Manufacturing Company of Arizona)” to “Honeywell International Inc. (Type Certificate
previously held by AlliedSignal Inc.).”
We removed paragraph (g)(4) of the NPRM which required inspection of the removed fan disks
in accordance with paragraph 3.D.(2) in the Accomplishment Instructions of Honeywell SB TFE731-
72-5256, Revision 0, dated October 7, 2016. Although fan disks may be returned to Honeywell for
inspection and rework to become eligible for installation, that is not a requirement of this AD.
We revised the definition of “parts eligible for installation” in paragraph (g) of this AD to read:
“For the purposes of this AD, parts eligible for installation are: (i) Fan disks not listed in the
Accomplishment Instructions, Table 9, in Honeywell SB TFE731-72-5256, Revision 0, dated
October 7, 2016; or (ii) fan disks listed in Table 9 that have been inspected, reworked, and marked
with “T43374” adjacent to the P/N or S/N. Guidance on returning affected parts to Honeywell for
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inspection and rework is found in the Accomplishment Instructions, paragraph 3.D., of Honeywell
SB TFE731-72-5256.” This definition clarifies that fan disks with a P/N not affected by this AD, as
well as parts that have been reworked and remarked, are eligible for installation.

Conclusion

We reviewed the relevant data, considered the comments received, and determined that air safety
and the public interest require adopting this final rule as proposed for minor editorial changes and the
additional changes explained above. 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) TFE731-72-5256, Revision 0, dated October 7,
2016. The SB identifies affected fan disks by serial number and describes procedures for removing,
inspecting, and replacing the fan disks. This service information is available by the means identified
in the ADDRESSES section.

Costs of Compliance

We estimate that this AD affects 61 engines installed on airplanes of U.S. registry.
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
Remove fan disk 8 work-hours × $85 per $0 $680 $41,480
hour = $680
Install reworked or new 26 work-hours × $85 per 0 2,210 134,810
fan disk hour = $2,210

We estimate the following costs to do any necessary disk replacements that would be required
based on the results of the required inspection. We estimate that 6 engines will need this replacement:

On-Condition Costs
Action Labor cost Parts Cost per
cost product
Replace non-serviceable disks with new 1 work-hour × $85 per hour $50,000 $50,085
fan disk = $85

According to the manufacturer, some of the costs of this AD may be covered under warranty,
thereby reducing the cost impact on affected individuals. We do not control warranty coverage for
affected individuals. As a result, we have included all costs in our cost estimate.




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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
engines, propellers, and 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


2017-20-01 Honeywell International Inc. (Type Certificate previously held by AlliedSignal
Inc.): Amendment 39-19058; Docket No. FAA-2016-9451; Product Identifier 2016-NE-24-AD.

(a) Effective Date

This AD is effective November 2, 2017.

(b) Affected ADs

None.

(c) Applicability

This AD applies to all Honeywell International Inc. (Honeywell) TFE731-20 and TFE731-40
turbofan engines, with a fan disk, part number (P/N) 3060287-2, and a serial number (S/N) listed in
Table 9 of Honeywell Service Bulletin (SB) TFE731-72-5256, Revision 0, dated October 7, 2016,
that do not have “T43374” marked adjacent to the engine P/N or S/N.

(d) Subject

Joint Aircraft System Component (JASC) Code 7230, Turbine Engine Compressor Section.

(e) Unsafe Condition

This AD was prompted by a report of two fan disks found with surface rollovers in the dovetail
slot area. We are issuing this AD to prevent uncontained failure of the fan disks, damage to the
engine, and damage to the airplane.

(f) Compliance

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

(g) Required Actions

Remove the fan disk using the following criteria:
(1) Remove fan disks with 9,000 cycles-since-new (CSN) or more on the effective date of this
AD, within 100 cycles-in-service (CIS), or at the next engine shop visit, or at next access, whichever
occurs first, after the effective date of this AD.
(2) Remove fan disks with between 8,000 and 8,999 CSN, inclusive, on the effective date of this
AD, within 9,100 CSN or within 1,000 CIS, or at the next engine shop visit, or at next access,
whichever occurs first, after the effective date of this AD.
(3) Remove fan disks with fewer than 8,000 CSN, on the effective date of this AD, before
exceeding 9,000 CSN, or at the next engine shop visit, or at next access, whichever occurs first, after
the effective date of this AD.

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(4) Replace all removed fan disks with a part eligible for installation.

(h) Definitions

(1) For the purposes of this AD, an engine shop visit is defined as the removal of the tie-shaft nut
from the engine.
(2) For the purposes of this AD, access is defined as the removal of the fan rotor assembly from
the engine.
(3) For the purposes of this AD, parts eligible for installation are:
(i) fan disks not listed in the Accomplishment Instructions, Table 9, in Honeywell SB TFE731-
72-5256, Revision 0, dated October 7, 2016; or
(ii) fan disks listed in Table 9, in Honeywell SB TFE731-72-5256, Revision 0, dated October 7,
2016, that have been inspected, reworked, and marked with “T43374” adjacent to the P/N or S/N.
Guidance on returning affected parts to Honeywell for inspection and rework is found in the
Accomplishment Instructions, paragraph 3.D., of Honeywell SB TFE731-72-5256.

(i) Alternative Methods of Compliance (AMOCs)

(1) The Manager, Los Angeles ACO Branch, 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 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 TFE731-72-5256, Revision 0, dated October 7, 2016.
(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.
(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 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 21, 2017.
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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.