[Federal Register Volume 63, Number 15 (Friday, January 23, 1998)]
[Proposed Rules]
[Pages 3483-3491]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 98-1483]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 97-ANE-45-AD]
RIN 2120-AA64


Airworthiness Directives; Pratt & Whitney JT8D Series Turbofan 
Engines

AGENCY: Federal Aviation Administration, DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: This document proposes the adoption of a new airworthiness 
directive (AD) that is applicable to Pratt & Whitney JT8D series 
turbofan engines. This proposal would require a one-time visual and 
eddy current inspection of certain stage 3-4 low pressure compressor 
(LPC) disks and stage 7-12 high pressure compressor (HPC) disks 
identified by part number and serial number, for arc burns in tie rod, 
shielding, and pressure balance holes, and, if necessary, repair of tie 
rod holes. This proposal is prompted by reports of improper fixturing 
during the electrolytic cleaning process of certain compressor disks at 
a certified repair station, Avial, currently Greenwich Air Services 
Inc., certificate number RA1R445K of Dallas, Texas, that can result in 
damage to the disks in the form of arc burns. The actions specified by 
the proposed AD are intended to prevent compressor disk cracking from 
arc burns in tie rod holes, shielding holes, or pressure balance holes, 
which could lead to a fracture of a compressor disk, resulting in 
uncontained release of engine fragments, inflight engine shutdown, and 
airframe damage.

DATES: Comments must be received by February 23, 1998.

ADDRESSES: Submit comments in triplicate to the Federal Aviation 
Administration (FAA), New England Region, Office of the Regional 
Counsel, Attention: Rules Docket No. 97-ANE-45-AD, 12 New England 
Executive Park, Burlington, MA 01803-5299. Comments may also be sent 
via the Internet using the following address: ``<a href="/cdn-cgi/l/email-protection#3d04105c59103758535a5453584d4f524d7d5b5c5c13595249135a524b">9-ad-
<span class="__cf_email__" data-cfemail="e4818a838d8a8194968b94a4828585ca808b90ca838b92">[email protected]</span></a>''. Comments sent via the Internet must contain 
the docket number in the subject line. Comments may be inspected at 
this location between 8:00 a.m. and 4:30 p.m., Monday through Friday, 
except Federal holidays.
    The service information referenced in the proposed rule may be 
obtained from Greenwich Air Services, 9311 Reeves Street, Dallas TX 
75235-2095; telephone (214) 956-5310, fax (214) 956-5523. This 
information may be examined at the FAA, New England Region, Office of 
the Regional Counsel, 12 New England Executive Park, Burlington, MA.

FOR FURTHER INFORMATION CONTACT: Christopher Spinney, Aerospace 
Engineer, Engine Certification Office, FAA, Engine and Propeller 
Directorate, 12 New England Executive Park, Burlington, MA 01803-5299; 
telephone (781) 238-7175, fax (781) 238-7199.

SUPPLEMENTARY INFORMATION:

Comments Invited

    Interested persons are invited to participate in the making of the 
proposed rule by submitting such written data, views, or arguments as 
they may desire. Communications should identify the Rules Docket number 
and be submitted in triplicate to the address specified above. All 
communications received on or before

[[Page 3484]]

the closing date for comments, specified above, will be considered 
before taking action on the proposed rule. The proposals contained in 
this notice may be changed in light of the comments received.
    Comments are specifically invited on the overall regulatory, 
economic, environmental, and energy aspects of the proposed rule. All 
comments submitted will be available, both before and after the closing 
date for comments, in the Rules Docket for examination by interested 
persons. A report summarizing each FAA-public contact concerned with 
the substance of this proposal will be filed in the Rules Docket.
    Commenters wishing the FAA to acknowledge receipt of their comments 
submitted in response to this notice must submit a self-addressed, 
stamped postcard on which the following statement is made: ``Comments 
to Docket Number 97-ANE-45-AD.'' The postcard will be date stamped and 
returned to the commenter.

Availability of NPRMs

    Any person may obtain a copy of this NPRM by submitting a request 
to the FAA, New England Region, Office of the Regional Counsel, 
Attention: Rules Docket No. 97-ANE-45-AD, 12 New England Executive 
Park, Burlington, MA 01803-5299.

Discussion

    The Federal Aviation Administration (FAA) received a report of 
certain low pressure compressor (LPC) and high pressure compressor 
(HPC) disks, installed on Pratt & Whitney (PW) JT8D series turbofan 
engines, that were improperly fixtured during the electrolytic cleaning 
process at a certain repair station. This improper fixturing can lead 
to damage to compressor disks in the form of arc burns. Arc burns can 
degrade disk material properties and create a stress concentration that 
results in premature cracking of a disk and subsequent failure. This 
condition, if not corrected, could result in compressor disk cracking 
from arc burns in tie rod holes, shielding holes, or pressure balance 
holes, which could lead to a fracture of a compressor disk, resulting 
in uncontained release of engine fragments, inflight engine shutdown, 
and airframe damage.
    A metallurgical laboratory procedure and a new highly sensitive 
eddy current inspection technique have been developed to identify arc-
burn defects. Because the inspections and repair require 
familiarization with newly developed techniques and require facilities, 
equipment and personnel outside the scope of a typical repair facility, 
the FAA has determined that only the facility named in the AD are 
currently approved to perform the required inspections and repairs. 
Operators who desire to use another facility must apply for approval 
using the alternate method of compliance procedure provided in 
paragraph (d) of the AD.
    The FAA has reviewed and approved the technical contents of 
Greenwich Air Services Technical Instruction (TI) 885 dated, October 
20, 1997, that describes procedures for visual and eddy current 
inspections and repairs for compressor disks which have been exposed to 
the potential of arc burn.
    Since an unsafe condition has been identified that is likely to 
exist or develop on other products of this same type design, the 
proposed AD would require, at the next shop visit after the effective 
date of this AD, a one-time visual and eddy current inspection of 
compressor disks to detect arc burn damage and if appropriate, repair 
of damaged area. The actions would be required to be accomplished in 
accordance with the technical instruction described previously.
    There are a total of 1,388 compressor disks exposed to improper 
fixturing during the electrolytic cleaning process. The FAA estimates 
that 1,054 of these disks currently remain in service in the worldwide 
fleet, which represents approximately 210 engines. The FAA also 
estimates that 840 of the disks affected by the proposed AD are 
installed in engines installed on aircraft of U.S. registry. It will 
take approximately 30 work hours to accomplish the proposed actions per 
disk, and that the average labor rate is $60 per work hour. Required 
parts would cost approximately $23 per disk. Based on these figures, 
the total cost impact of the proposed AD on U.S. operators is estimated 
to be $1,531,320.
    The regulations proposed herein would 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 
proposal would not have sufficient federalism implications to warrant 
the preparation of a Federalism Assessment.
    For the reasons discussed above, I certify that this proposed 
regulation (1) is not a ``significant regulatory action'' under 
Executive Order 12866; (2) is not a ``significant rule'' under the DOT 
Regulatory Policies and Procedures (44 FR 11034, February 26, 1979); 
and (3) if promulgated, 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 copy of the draft 
regulatory evaluation prepared for this action is contained in the 
Rules Docket. A copy of it may be obtained by contacting the Rules 
Docket at the location provided under the caption ADDRESSES.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Safety.

The Proposed Amendment

    Accordingly, pursuant to the authority delegated to me by the 
Administrator, the Federal Aviation Administration proposes to amend 
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. 106(g), 40113, 44701.


Sec. 39.13  [Amended]

    2. Section 39.13 is amended by adding the following new 
airworthiness directive:

Pratt & Whitney: Docket No. 97-ANE-45-AD.

    Applicability: Pratt & Whitney (PW) JT8D-1, -1A, -1B, -7, -7A, -
7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, -17AR, -209, -217, -
217A, -217C, and -219 model turbofan engines which have a compressor 
disk installed identified by part number and serial number in Table 
1 of this AD. These engines are installed on but not limited to 
Boeing 727 and 737 series, and McDonnell Douglas DC-9 and MD80 
series aircraft.

    Note 1: This airworthiness directive (AD) applies to each engine 
identified in the preceding applicability provision, regardless of 
whether it has been modified, altered, or repaired in the area 
subject to the requirements of this AD. For engines that have been 
modified, altered, or repaired so that the performance of the 
requirements of this AD is affected, the owner/operator must request 
approval for an alternative method of compliance in accordance with 
paragraph (d) of this AD. The request should include an assessment 
of the effect of the modification, alteration, or repair on the 
unsafe condition addressed by this AD; and, if the unsafe condition 
has not been eliminated, the request should include specific 
proposed actions to address it.

    Compliance: Required as indicated, unless accomplished 
previously.
    To prevent compressor disk cracking from arc burns in tie rod 
holes, shielding holes, or pressure balance holes, which could lead 
to a fracture of a compressor disk, resulting in uncontained release 
of engine fragments,

[[Page 3485]]

inflight engine shutdown, and airframe damage, accomplish the 
following:
    (a) At the next shop visit after the effective date of this AD, 
remove, visually inspect, eddy current inspect, and repair or 
replace with a serviceable part disks identified by part number and 
serial number in Table 1 of this AD in accordance with Greenwich Air 
Services Technical Instruction (TI) 885, dated October 20, 1997.

                                 Table 1                                
------------------------------------------------------------------------
              Stage                     P/N                S/N          
------------------------------------------------------------------------
3................................        745803  H13469                 
3................................        745803  N48096                 
3................................        745803  N48361                 
3................................        745803  P77936                 
3................................        745803  P77942                 
3................................        745803  P78298                 
3................................        745803  P98041                 
3................................        745803  P98334                 
3................................        745803  R18766                 
3................................        745803  R18989                 
3................................        745803  R19227                 
3................................        745803  R73555                 
3................................        745803  R74156                 
4................................        745704  2A3332                 
4................................        745704  2A4258                 
4................................        745704  G51920                 
4................................        745704  H04195                 
4................................        745704  J46788                 
4................................        745704  J76639                 
4................................        745704  K11388                 
4................................        745704  K11483                 
4................................        745704  K12946                 
4................................        745704  K52509                 
4................................        745704  K53069                 
4................................        745704  L60864                 
4................................        745704  L61145                 
4................................        777704  B114AA0034             
4................................        777704  B114AA0178             
4................................        777704  B114AA0274             
4................................        777704  BBDUA14597             
4................................        777704  BBDUAH4675             
4................................        777704  BBDUAH7390             
4................................        777704  J77499                 
4................................        777704  J94590                 
4................................        777704  K43182                 
4................................        777704  L81216                 
4................................        777704  L81217                 
4................................        777704  L81218                 
4................................        777704  L81224                 
4................................        777704  L81688                 
4................................        777704  M40670                 
4................................        777704  M44376                 
4................................        777704  M44384                 
4................................        777704  M53723                 
4................................        777704  M53753                 
4................................        777704  M53810                 
4................................        777704  M53815                 
4................................        777704  N30898                 
4................................        777704  N30938                 
4................................        777704  N30943                 
4................................        777704  N30947                 
4................................        777704  N30956                 
4................................        777704  N53261                 
4................................        777704  N53280                 
4................................        777704  N53284                 
4................................        777704  N53290                 
4................................        777704  N53296                 
4................................        777704  N53299                 
4................................        777704  N53309                 
4................................        777704  N53317                 
4................................        777704  N53324                 
4................................        777704  N53337                 
4................................        777704  N53340                 
4................................        777704  N53347                 
4................................        777704  N53355                 
4................................        777704  N53356                 
4................................        777704  N53361                 
4................................        777704  N53364                 
4................................        777704  N53366                 
4................................        777704  N53373                 
4................................        777704  N53388                 
4................................        777704  N53390                 
4................................        777704  N53392                 
4................................        777704  N53397                 
4................................        777704  N53402                 
4................................        777704  N53405                 
4................................        777704  N53407                 
4................................        777704  N53409                 
4................................        777704  N53411                 
4................................        777704  N53413                 
4................................        777704  N53416                 
4................................        777704  N53419                 
4................................        777704  N53426                 
4................................        777704  N53434                 
4................................        777704  N53437                 
4................................        777704  N53438                 
4................................        777704  N53449                 
4................................        777704  N63635                 
4................................        777704  N63637                 
4................................        777704  N63646                 
4................................        777704  N63651                 
4................................        777704  N63696                 
4................................        777704  N63704                 
4................................        777704  N63718                 
4................................        777704  N63736                 
4................................        777704  N63740                 
4................................        777704  N63745                 
4................................        777704  N63803                 
4................................        777704  P50018                 
4................................        777704  P50025                 
4................................        777704  P50036                 
4................................        777704  P50050                 
4................................        777704  P50054                 
4................................        777704  P50083                 
4................................        777704  P63990                 
4................................        777704  R21906                 
4................................        777704  R21930                 
4................................        777704  R21985                 
4................................        777704  R21991                 
4................................        777704  R41366                 
4................................        777704  R42431                 
4................................        777704  R56904                 
4................................        777704  R56911                 
4................................        777704  R56932                 
4................................        777704  R56948                 
4................................        777704  R75603                 
4................................        777704  R75635                 
4................................        777704  R75644                 
4................................        777704  S28269                 
4................................        777704  S28335                 
4................................        777704  S28336                 
4................................        777704  S65405                 
4................................        777704  S65417                 
4................................        777704  S87903                 
4................................        777704  S91630                 
4................................        777704  T00466                 
4................................        777704  T48099                 
4................................        777704  T48101                 
4................................        777704  T48105                 
4................................        799504  K23796                 
4................................        799504  L61578                 
4................................        799504  L61597                 
4................................        799504  L89794                 
4................................        799504  M77214                 
4................................        799504  N06109                 
4................................        799504  N06248                 
4................................        799504  N06731                 
4................................        799504  N06908                 
4................................        799504  N06911                 
4................................        799504  N32484                 
4................................        799504  N32493                 
4................................        799504  N32514                 
4................................        799504  N33627                 
4................................        799504  N33880                 
4................................        799504  N34238                 
4................................        799504  N89280                 
4................................        799504  N89817                 
4................................        799504  N90599                 
4................................        799504  N90812                 
4................................        799504  N90849                 
4................................        799504  P45299                 
4................................        799504  P45435                 
4................................        799504  R23598                 
4................................        799504  R23753                 
4................................        799504  R24022                 
4................................        799504  R24310                 
4................................        799504  R24543                 
4................................        799504  S07095                 
4................................        799504  S07147                 
4................................        799504  S07164                 
4................................        799504  S07250                 
4................................        799504  S58162                 
4................................        799504  S58237                 
4................................        799504  T02774                 
4................................        799504  T02897                 
4................................        799504  T03020                 
4................................        799504  T03027                 
4................................        799504  T03038                 
4................................        799504  T03047                 
7................................        701407  7Z5379                 
7................................        766007  G11181                 
7................................        774407  B207AA0057             
7................................        774407  B207AA0164             
7................................        774407  B207AA0224             
7................................        774407  B207AA0270             
7................................        774407  B207AA0546             
7................................        774407  B207AA0719             
7................................        774407  B207AA0757             
7................................        774407  B207AA0768             
7................................        774407  B207AA0775             
7................................        774407  B207AA0913             
7................................        774407  BENCAH1914             
7................................        774407  BENCAH4273             
7................................        774407  BENCAJ5690             
7................................        774407  BENCAK1601             
7................................        774407  BENCAK5082             
7................................        774407  BENCAK5701             
7................................        774407  BENCAK6044             
7................................        774407  BENCAK6586             
7................................        774407  G78791                 
7................................        774407  H19147                 
7................................        774407  H75592                 
7................................        774407  J08985                 
7................................        774407  J17315                 
7................................        774407  J17370                 
7................................        774407  J72117                 
7................................        774407  J93428                 
7................................        774407  J93669                 
7................................        774407  K78068                 
7................................        774407  K78149                 
7................................        774407  K78378                 
7................................        774407  L23953                 
7................................        774407  L71885                 
7................................        774407  L71922                 
7................................        774407  L72170                 

[[Page 3486]]

                                                                        
7................................        774407  L72261                 
7................................        774407  M38646                 
7................................        774407  M44626                 
7................................        774407  M60192                 
7................................        774407  M78767                 
7................................        774407  M83783                 
7................................        774407  M93487                 
7................................        774407  M93549                 
7................................        774407  N24007                 
7................................        774407  N24131                 
7................................        774407  N58891                 
7................................        774407  N58905                 
7................................        774407  N59040                 
7................................        774407  N70414                 
7................................        774407  N88273                 
7................................        774407  N88281                 
7................................        774407  N88306                 
7................................        774407  N93477                 
7................................        774407  N95003                 
7................................        774407  P14688                 
7................................        774407  P14851                 
7................................        774407  P16547                 
7................................        774407  P35320                 
7................................        774407  P35374                 
7................................        774407  P35475                 
7................................        774407  P54474                 
7................................        774407  P54594                 
7................................        774407  P60383                 
7................................        774407  P60383                 
7................................        774407  P81375                 
7................................        774407  P81382                 
7................................        774407  P86353                 
7................................        774407  R19478                 
7................................        774407  R31305                 
7................................        774407  R37450                 
7................................        774407  R46879                 
7................................        774407  R46934                 
7................................        774407  R57593                 
7................................        774407  R57744                 
7................................        774407  R57769                 
7................................        774407  R72169                 
7................................        774407  R72236                 
7................................        774407  R81458                 
7................................        774407  R81507                 
7................................        774407  R81527                 
7................................        774407  R81612                 
7................................        774407  R90895                 
7................................        774407  S05652                 
7................................        774407  S13843                 
7................................        774407  S14099                 
7................................        774407  S14103                 
7................................        774407  S36805                 
7................................        774407  S36885                 
7................................        774407  S36896                 
7................................        774407  S36994                 
7................................        774407  S36995                 
7................................        774407  S37166                 
7................................        774407  S37554                 
7................................        774407  T04613                 
7................................        774407  T04687                 
7................................        774407  T04739                 
7................................        774407  T04806                 
7................................        774407  T04812                 
7................................        774407  T04814                 
7................................        774407  T04837                 
7................................        774407  T04843                 
7................................        774407  T04885                 
7................................        774407  T04903                 
7................................        774407  T04960                 
7................................        774407  T05000                 
7................................        774407  T05108                 
7................................    5006007-02  BENCAK9696             
7................................    5006007-02  BENCAK9900             
7................................    5006007-02  BENCAL0760             
7................................    5006007-02  BENCAL1937             
7................................    5006007-02  BENCAL4577             
7................................    5006007-02  BENCAL5766             
7................................    5006007-01  AA0297                 
7................................    5006007-01  B207AA0069             
7................................    5006007-01  B207AA0135             
7................................    5006007-01  B207AA0155             
7................................    5006007-01  B207AA0172             
7................................    5006007-01  B207AA0177             
7................................    5006007-01  B207AA0354             
7................................    5006007-01  B207AA0355             
7................................    5006007-01  B207AA0421             
7................................    5006007-01  B207AA0493             
7................................    5006007-01  B207AA0533             
7................................    5006007-01  B207AA0571             
7................................    5006007-01  B207AA0684             
7................................    5006007-01  B207AA0756             
7................................    5006007-01  B207AA0811             
7................................    5006007-01  BENCAH3454             
7................................    5006007-01  BENCAH4003             
7................................    5006007-01  BENCAH4004             
7................................    5006007-01  BENCAH4371             
7................................    5006007-01  BENCAH4373             
7................................    5006007-01  BENCAH4794             
7................................    5006007-01  BENCAH4797             
7................................    5006007-01  BENCAH5400             
7................................    5006007-01  BENCAH5401             
7................................    5006007-01  BENCAJ8559             
7................................    5006007-01  BENCAJ8585             
7................................    5006007-01  BENCAJ8614             
7................................    5006007-01  BENCAJ8626             
7................................    5006007-01  BENCAJ8656             
7................................    5006007-01  BENCAJ9106             
7................................    5006007-01  BENCAK5959             
7................................    5006007-01  BENCAK5963             
7................................    5006007-01  BENCAK9770             
7................................    5006007-01  BENCAK9771             
7................................    5006007-01  BENCAL2683             
7................................    5006007-01  BENCAL3622             
7................................    5006007-01  BENCAL3931             
7................................    5006007-01  K20260                 
7................................    5006007-01  K20499                 
7................................    5006007-01  K20543                 
7................................    5006007-01  N09043                 
7................................    5006007-01  N65077                 
7................................    5006007-01  N65107                 
7................................    5006007-01  N65132                 
7................................    5006007-01  N93173                 
7................................    5006007-01  N93193                 
7................................    5006007-01  P23185                 
7................................    5006007-01  P23236                 
7................................    5006007-01  P49794                 
7................................    5006007-01  P49835                 
7................................    5006007-01  P92551                 
7................................    5006007-01  P92580                 
7................................    5006007-01  R12660                 
7................................    5006007-01  R12670                 
7................................    5006007-01  R12710                 
7................................    5006007-01  R35504                 
7................................    5006007-01  R35530                 
7................................    5006007-01  R36545                 
7................................    5006007-01  R43821                 
7................................    5006007-01  R54576                 
7................................    5006007-01  R54634                 
7................................    5006007-01  R79460                 
7................................    5006007-01  R79466                 
7................................    5006007-01  R92415                 
7................................    5006007-01  R92431                 
7................................    5006007-01  R92435                 
7................................    5006007-01  R92442                 
7................................    5006007-01  S11034                 
7................................    5006007-01  S11058                 
7................................    5006007-01  S11154                 
7................................    5006007-01  S11156                 
7................................    5006007-01  S11179                 
7................................    5006007-01  S11182                 
7................................    5006007-01  S11186                 
7................................    5006007-01  S11202                 
7................................    5006007-01  S11206                 
7................................    5006007-01  S56884                 
7................................    5006007-01  S56888                 
7................................    5006007-01  S56998                 
7................................    5006007-01  S57073                 
7................................    5006007-01  S57075                 
7................................    5006007-01  S57117                 
7................................    5006007-01  S57120                 
7................................    5006007-01  S57156                 
7................................    5006007-01  S57157                 
7................................    5006007-01  S57192                 
7................................    5006007-01  S57220                 
7................................    5006007-01  S57332                 
7................................    5006007-01  S57354                 
7................................    5006007-01  S57405                 
7................................    5006007-01  S57412                 
7................................    5006007-01  S57420                 
7................................    5006007-01  S57424                 
7................................    5006007-01  S57437                 
7................................    5006007-01  S57452                 
7................................    5006007-01  S57467                 
7................................    5006007-01  S57470                 
7................................    5006007-01  S57589                 
8................................        748608  B208AA0043             
8................................        748608  BENCAK1564             
8................................        748608  H50069                 
8................................        748608  H64474                 
8................................        748608  H64605                 
8................................        748608  J57591                 
8................................        748608  J94824                 
8................................        748608  M54652                 
8................................        748608  M54835                 
8................................        748608  N14526                 
8................................        748608  N84300                 
8................................        748608  P-28517                
8................................        748608  P26161                 
8................................        748608  P28493                 
8................................        748608  P28504                 
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------------------------------------------------------------------------

    (b) For the purpose of this AD, a shop visit is defined as an 
engine removal, where engine maintenance entails separation of pairs of 
major mating engine flanges or the removal of a disk, hub, or spool 
regardless of other planned maintenance.
    (c) The accomplishment of the inspections and repairs specified in 
this AD must be performed at Greenwich Air Services Inc., certificate 
number RA1R445K of Dallas, Texas. Operators wishing to use another 
facility to perform the required inspections and repairs must apply for 
an alternate method of compliance in accordance with paragraph (d) of 
this AD.
    (d) 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. Operators 
shall submit their request through an appropriate FAA Principal 
Maintenance Inspector, who may add comments and then send it to the 
Manager, Engine Certification Office.
    Note 2: Information concerning the existence of approved 
alternative methods of compliance with this airworthiness directive, if 
any, may be obtained from the Engine Certification Office.
    (e) Special flight permits may be issued in accordance with 
sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 
21.197 and 21.199) to operate the aircraft to a location where the 
inspection requirements of this AD can be accomplished.

    Issued in Burlington, Massachusetts, on January 8, 1998.
James C. Jones,
Assistant Manager, Engine and Propeller Directorate, Aircraft 
Certification Service.
[FR Doc. 98-1483 Filed 1-22-98; 8:45 am]
BILLING CODE 4910-13-U


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