[Federal Register Volume 60, Number 44 (Tuesday, March 7, 1995)]
[Rules and Regulations]
[Pages 12414-12415]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 95-4125]
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DEPARTMENT OF TRANSPORTATION
14 CFR Part 39
[Docket No. 92-ANE-11; Amendment 39-9151; AD 95-03-15]
Airworthiness Directives; Textron Lycoming ALF502R Series
Turbofan Engines
AGENCY: Federal Aviation Administration, DOT.
ACTION: Final rule.
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SUMMARY: This amendment adopts a new airworthiness directive (AD),
applicable to Textron Lycoming ALF502R series turbofan engines, that
reduces the service life for the No. 2 stage turbine disk, reduces the
service lives for No. 1 and No. 3 through No. 7 stage compressor rotor
disks, and requires a scheduled removal of these disks from service.
This amendment is prompted by reports of cracks in disks returned from
the field and in disks tested by the manufacturer. The actions
specified by this AD are intended to prevent disk failure resulting in
a possible uncontained engine failure.
DATES: Effective on May 8, 1995.
The incorporation by reference of certain publications listed in
the regulations is approved by the Director of the Federal Register as
of May 8, 1995.
ADDRESSES: The service information referenced in this AD may be
obtained from AlliedSignal Engines, 550 Main Street, Stratford, CT
06497. This information may be examined at the Federal Aviation
Administration (FAA), New England Region, Office of the Assistant Chief
Counsel, 12 New England Executive Park, Burlington, MA; or at the
Office of the Federal Register, 800 North Capitol Street, NW., suite
700, Washington, DC.
FOR FURTHER INFORMATION CONTACT: Eugene Triozzi, Aerospace Engineer,
Engine Certification Office, FAA, Engine and Propeller Directorate, 12
New England Executive Park, Burlington, MA 01803-5299; telephone (617)
238-7148, fax (617) 238-7199.
SUPPLEMENTARY INFORMATION: A proposal to amend part 39 of the Federal
Aviation Regulations (14 CFR part 39) to include an airworthiness
directive (AD) that is applicable to Textron Lycoming ALF502R series
turbofan engines was published in the Federal Register on March 16,
1993 (58 FR 14185). That action proposed to reduce the service life for
the No. 2 stage turbine disk, reduce the service lives for No. 1 and
No. 3 through No. 7 stage compressor rotor disks, and require a
scheduled removal of these disks from service in accordance with
Textron Lycoming Service Bulletin (SB) ALF502R 72-281, dated February
7, 1992.
The compliance section of this final rule has been revised to
specify the reduced service lives for each affected disk, to clarify
that the reduced service lives are the new life limits.
Interested persons have been afforded an opportunity to participate
in the making of this amendment. No comments were received on the
proposal or the FAA's determination of the cost to the public. The FAA
has determined that air safety and the public interest require the
adoption of the rule with the changes described previously.
On October 28, 1994, AlliedSignal Inc. purchased the turbine engine
product line of Textron Lycoming, but as of this date the anticipated
name change on the type certificate for the ALF502R series engines has
not occurred.
There are approximately 700 Textron Lycoming ALF502R series
turbofan [[Page 12415]] engines of the affected design in the worldwide
fleet. The FAA estimates that 200 engines installed on aircraft of U.S.
registry will be affected by this AD. The required reduction in service
life will cost $41,400 per engine based on the cost of a new disk
prorated over the reduced service life as compared to the current
service life. Based on these figures, the total cost impact of the AD
on U.S. operators is estimated to be $8,280,000.
The regulations adopted herein will not have substantial direct
effects 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. Therefore, in
accordance with Executive Order 12612, it is determined that this final
rule does not have sufficient federalism implications to warrant the
preparation of a Federalism Assessment.
For the reasons discussed above, I certify that this action (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. A final evaluation has been prepared for this action
and it is contained in the Rules Docket. A copy of it may be obtained
from the Rules Docket at the location provided under the caption
ADDRESSES.
List of Subjects in 14 CFR Part 39
Air Transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.
Adoption of the Amendment
Accordingly, pursuant to the authority delegated to me by the
Administrator, the Federal Aviation Administration amends part 39 of
the Federal Aviation Regulations (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. App. 1354(a), 1421 and 1423; 49 U.S.C.
106(g); and 14 CFR 11.89.
Sec. 39.13 [Amended]
2. Section 39.13 is amended by adding the following new
airworthiness directive:
95-03-15 Textron Lycoming: Amendment 39-9151. Docket 92-ANE-11.
Applicability: Textron Lycoming ALF502R series turbofan engines
installed on but not limited to British Aerospace BAe-146 aircraft.
Compliance: Required as indicated, unless accomplished
previously.
To prevent No. 2 stage turbine disk, and No. 1 and No. 3 through
No. 7 stage compressor rotor disk, failure resulting in possible
uncontained engine failure, accomplish the following:
(a) Remove from service No. 2 stage turbine disks, P/Ns 2-121-
058-18, 2-121-058-20, and 2-121-058-R24, in accordance with the
schedule defined in paragraph B(1) of Table 1 of Textron Lycoming
Service Bulletin (SB) ALF502R 72-281, dated February 7, 1992, and
replace with a disk with cycle accumulation no greater than the
reduced service life limit of 10,000 cycles.
(b) Remove from service No. 1 stage compressor rotor disks, P/N
2-101-331-04, in accordance with paragraph A(1) of Table 1 of
Textron Lycoming SB No. ALF502R 72-281, dated February 7, 1992, and
replace with a disk with cycle accumulation no greater than the
reduced service life limit of 12,500 cycles.
(c) Remove from service No. 3 stage compressor rotor disks, P/Ns
2-101-263-02, 2-101-263-05, 2-101-263-06, 2-101-263-09, and 2-101-
263-R10, in accordance with paragraph A(2) of Table 1 of Textron
Lycoming SB No. ALF502R 72-281, dated February 7, 1992, and replace
with a disk with cycle accumulation no greater than the reduced
service life limit of 11,800 cycles.
(d) Remove from service No. 4 stage compressor rotor disks, P/Ns
2-100-042-03, 2-100-042-07, 2-100-042-09, and 2-100-042-R08, in
accordance with paragraph A(3) of Table 1 of Textron Lycoming SB No.
ALF502R 72-281, dated February 7, 1992, and replace with a disk with
cycle accumulation no greater than the reduced service life limit of
9,000 cycles.
(e) Remove from service No. 5 stage compressor rotor disks, P/Ns
2-100-043-01, 2-100-043-07, 2-100-043-09, and 2-100-043-R08, in
accordance with paragraph A(4) of Table 1 of Textron Lycoming SB No.
ALF502R 72-281, dated February 7, 1992, and replace with a disk with
cycle accumulation no greater than the reduced service life limit of
12,300 cycles.
(f) Remove from service No. 6 stage compressor rotor disks, P/Ns
2-100-044-01, 2-100-044-05, 2-100-044-07, and 2-100-044-R06, in
accordance with paragraph A(5) of Table 1 of Textron Lycoming SB No.
ALF502R 72-281, dated February 7, 1992, and replace with a disk with
cycle accumulation no greater than the reduced service life limit of
12,500 cycles.
(g) Remove from service No. 7 stage compressor rotor disks, P/Ns
2-100-045-01, 2-100-045-05, 2-100-045-07, and 2-100-045-R06, in
accordance with paragraph A(6) of Table 1 of Textron Lycoming SB No.
ALF502R 72-281, dated February 7, 1992, and replace with a disk with
cycle accumulation no greater than the reduced service life limit of
9,200 cycles.
(h) An alternative method of compliance or adjustment of the
compliance time that provides an acceptable level of safety may be
used if approved by the Manager, Engine Certification Office. The
request should be forwarded through an appropriate FAA Principal
Maintenance Inspector, who may add comments and then send it to the
Manager, Engine Certification Office.
Note: Information concerning the existence of approved
alternative methods of compliance with this airworthiness directive,
if any, may be obtained from the Engine Certification Office.
(i) The actions required by this AD shall be done in accordance
with the following Textron Lycoming service bulletin:
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Document No. Pages Date
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ALF502R 72-281............................. 1-5 Feb. 7, 1992.
Total pages............................ 5
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This incorporation by reference was approved by the Director of the
Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part
51. Copies may be obtained from Textron Lycoming, 550 Main Street,
Stratford, CT 06497. Copies may be inspected at the FAA, New England
Region, Office of the Assistant Chief Counsel, 12 New England
Executive Park, Burlington, MA; or at the Office of the Federal
Register, 800 North Capitol Street NW., suite 700, Washington, DC.
(j) This amendment becomes effective on May 8, 1995.
Issued in Burlington, Massachusetts, on February 8, 1995.
James C. Jones,
Acting Manager, Engine and Propeller Directorate, Aircraft
Certification Service.
[FR Doc. 95-4125 Filed 3-6-95; 8:45 am]
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