```
[Federal Register Volume 63, Number 94 (Friday, May 15, 1998)]
[Proposed Rules]
[Pages 27002-27011]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 98-12918]

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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.

[[Page 27003]]

ACTION: Supplemental notice of proposed rulemaking; reopening of 
comment period.

-----------------------------------------------------------------------

SUMMARY: This document revises an earlier proposed airworthiness 
directive (AD), applicable to Pratt & Whitney JT8D series turbofan 
engines, that would have required 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. 
That proposal was prompted by reports of improper fixturing during the 
electrolytic cleaning process of certain compressor disks at a 
certified repair station, Avial or Greenwich Air Services, currently GE 
Engine Services Dallas LP, certificate number RA1R445K of Dallas, 
Texas, that can result in damage to the disks in the form of arc burns. 
This action revises the proposed rule by adding a drawdown schedule for 
removal of affected disks. The actions specified by this 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 July 14, 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: ``9-ad-[email protected]''. 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 GE Engine Services--Dallas LP, 9311 Reeves St., Dallas, 
TX 75235-2095. 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 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

    A proposal to amend part 39 of the Federal Aviation Regulations (14 
CFR part 39) to add an airworthiness directive (AD), applicable to 
Pratt & Whitney (PW) JT8D series turbofan engines, was published as a 
notice of proposed rulemaking (NPRM) in the Federal Register on January 
22,1998 (63 FR 3483). That NPRM would have required, at the next shop 
visit after the effective date of the AD, a one-time visual and eddy 
current inspection of compressor disks to detect arc burn damage and if 
appropriate, repair of damaged area. That NPRM was prompted by a report 
of certain low pressure compressor (LPC) and high pressure compressor 
(HPC) disks, installed on PW JT8D series turbofan engines, that were 
improperly fixtured during the electrolytic cleaning process at a 
certain repair station. That 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. That 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.
    Since the issuance of that NPRM, the FAA received a comment from 
the manufacturer stating that a drawdown schedule for removal of 
affected disks should be added to the proposed rule to maintain an 
acceptable level of safety, instead of requiring the inspection at the 
next shop visit. The FAA concurs and has added a drawdown schedule of 
3,000 cycles in service (CIS) after the effective date of this AD, or 
the next shop visit, whichever occurs first.
    Since this change expands the scope of the originally proposed 
rule, the FAA has determined that it is necessary to reopen the comment 
period to provide additional opportunity for public comment.
    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.

[[Page 27004]]

    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 airworthiness directive (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 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 (e) 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, inflight engine shutdown, and airframe damage, 
accomplish the following:
    (a) Within 3,000 cycles in service (CIS) after the effective 
date of this AD, or the next shop visit, whichever occurs first, 
remove, visually inspect, eddy current inspect, and repair or 
replace with a serviceable part disks identified by part number (P/
N) and serial number (S/N) in Table 1 of this AD in accordance with 
GE Engine Services--Dallas, LP, Engineering Bulletin (EB) JT8D-025, 
dated March 27, 1998. The next shop visit must occur by [insert 10 
years from AD effective date].

                                 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                

[[Page 27005]]

                                                                        
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                
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...............................      5006007-02  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                
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12..............................          798512  BENCAK9227            
12..............................          798512  BENCAL1655            
12..............................          798512  BENCAL2487            
12..............................          798512  BENCAL4173            
12..............................          798512  BENCAL6328            
12..............................          798512  BENCAL6602            
12..............................          798512  M86993                
12..............................          798512  N42703                
12..............................          798512  N42708                
12..............................          798512  N57617                
12..............................          798512  N57629                
12..............................          798512  N80087                
12..............................          798512  N80088                
12..............................          798512  N98138                
12..............................          798512  N99136                
12..............................          798512  N99144                
12..............................          798512  P53305                
12..............................          798512  P76909                
12..............................          798512  P76916                
12..............................          798512  P77722                
12..............................          798512  P78317                
12..............................          798512  R17334                
12..............................          798512  R46556                
12..............................          798512  R46562                
12..............................          798512  R73201                
12..............................          798512  R74214                
12..............................          798512  S02217                
12..............................          798512  S02254                
12..............................          798512  S51853                
12..............................          798512  S79575                
12..............................          798512  S94530                
12..............................          798512  S94534                
12..............................          798512  S94538                
12..............................          798512  S94539                
12..............................          798512  S94569                
12..............................          798512  S94579                
12..............................          798512  S94590                
12..............................          798512  S94615                
12..............................          798512  T19187                
12..............................          798512  T19213                
12..............................          798512  T19220                
12..............................          798512  T19242                
12..............................          798512  T19277                
12..............................          798512  T19292                
12..............................          798512  T19314                
12..............................          798512  T28638                
12..............................          798512  T43059                
------------------------------------------------------------------------

    (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 except where the 
maintenance performed is being done in lieu of performing the 
maintenance on wing.
    (c) The accomplishment of the inspections and repairs specified 
in this AD must be performed at GE Engine Services--Dallas, LP., 
certificate number RA1R445K of Dallas, Texas. Operators wishing to 
use another facility to perform the required inspections and repairs 
must apply for an alternative method of compliance in accordance 
with paragraph (e) of this AD.
    (d) Report the following information on a monthly basis to the 
Manager of the Engine Certification Office, FAA, 12 New England 
Executive Park, Burlington, MA 01803-5299; fax (781) 238-7199, 
Internet: Mark.C.F[email protected]. Reporting requirements have 
been approved by the Office of Management and Budget and assigned 
OMB control number 2120-0056:
    (1) S/N of engines inspected in accordance with paragraph (a) of 
this AD.

[[Page 27011]]

    (2) S/N of engines found with arc burns and approximate size of 
the arc burn.
    (3) S/N of engines repaired in accordance with paragraph (a) of 
this AD.
    (4) Hours and CIS since last shop visit and total hours and CIS 
of disks inspected in accordance with paragraph (a) of this AD.
    (5) Report to the Manager of the Engine Certification Office, 
within two business days of finding one of the following conditions 
as a result of inspecting a disk in accordance with paragraph (a) of 
this AD:
    (i) A crack depth of more than 5 mils.
    (ii) More than 2 tie rod holes with cracks.
    (iii) Arc burn depth beyond 9 mils.
    (e) 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.

    (f) 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 May 7, 1998.
Thomas A. Boudreau,
Acting Manager, Engine and Propeller Directorate, Aircraft 
Certification Service.
[FR Doc. 98-12918 Filed 5-14-98; 8:45 am]
BILLING CODE 4910-13-U
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