[Federal Register Volume 63, Number 206 (Monday, October 26, 1998)]
[Rules and Regulations]
[Pages 57048-57053]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 98-28534]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 95-ANE-37; Amendment 39-10857; AD 96-18-08 R1]
RIN 2120-AA64


Airworthiness Directives; Pratt & Whitney PW2000 Series Turbofan 
Engines

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final rule; request for comments.

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SUMMARY: This amendment revises an existing airworthiness directive 
(AD), applicable to Pratt & Whitney PW2000 series turbofan engines, 
that currently requires a reduction in the cyclic service life limit 
for hubs, disks, airseals, blade retaining plates, and airsealing ring 
supports on certain high pressure turbines (HPT) and low pressure 
turbines (LPT), and provides for optional inspections for cracks or 
rework of certain HPT and LPT hardware in order to retain the original, 
higher cyclic service life limit for these components. This amendment 
clarifies questions from operators regarding 2nd stage HPT hub detail 
vs. assembly part numbers (P/Ns). This amendment is prompted by 
comments from operators describing confusion as to which 2nd stage HPT 
hubs, identified by P/N, needed to be removed prior to the new life 
limit. The actions specified by this AD are intended to prevent HPT or 
LPT failure, which may result in an uncontained engine failure and 
possible damage to the aircraft.

DATES: Effective November 10, 1998.
    The incorporation by reference of Pratt & Whitney Alert Service 
Bulletin (ASB) No. PW2000 A72-82, Revision 1, dated April 25, 1986, 
Revision 2, dated July 17, 1986, Revision 3, dated November 7, 1986, 
Revision 4, dated June 18, 1987; ASB No. PW2000 A72-228, Revision 2, 
dated May 10, 1988, Revision 3, dated August 25, 1988, Revision 4, 
dated November 9, 1988; Service Bulletin (SB) No. PW2000 72-450, 
Original, dated March 13, 1992, Revision 1, dated March 26, 1992, 
Revision 2, dated April 7, 1992, Revision 3, dated May 29, 1992, 
Revision 4, dated August 28, 1992; ASB No. PW2000 72-450, Revision 5, 
dated May 28, 1994, Revision 6, dated July 9, 1996; SB No. PW72-501, 
Original, dated September 30, 1993; ASB No. PW2000 A72-220, Revision 3, 
dated April 13, 1989, Revision 4, dated September 20, 1989; SB No. 
PW2000 72-233, Revision 2, dated September 27, 1988, Revision 3, dated 
May 30, 1989, as listed in the regulations, was approved previously by 
the Director of the Federal Register as of November 29, 1996 (61 FR 
50984, September 30, 1996).
    Comments for inclusion in the Rules Docket must be received on or 
before December 28, 1998.

ADDRESSES: Submit comments in triplicate to the Federal Aviation 
Administration (FAA), New England Region, Office of the Regional 
Counsel, Attention: Rules Docket No. 95-ANE-37, 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.
    The service information referenced in this AD may be obtained from 
Pratt & Whitney, Publications Department, Supervisor Technical 
Publications Distribution, M/S 132-30, 400 Main St., East Hartford, CT 
06108; telephone (860) 565-7700, fax (860) 565-4503.

[[Page 57049]]

This information may be examined at the FAA, New England Region, Office 
of the Regional 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: Wego Wang, Aerospace Engineer, Engine 
Certification Office, FAA, Engine and Propeller Directorate, 12 New 
England Executive Park, Burlington, MA 01803-5299; telephone (781) 238-
7134, fax (781) 238-7199.

SUPPLEMENTARY INFORMATION: On August 26, 1996, the Federal Aviation 
Administration (FAA) issued AD 96-18-08, Amendment 39-9732 (61 FR 
50984, September 30, 1996), applicable to Pratt & Whitney PW2000 series 
turbofan engines, to require a reduction in the cyclic service life 
limit for hubs, disks, airseals, blade retaining plates, and airsealing 
ring supports on certain high pressure turbine (HPT) and low pressure 
turbine (LPT) hardware, and provide for optional inspections for cracks 
or rework of certain HPT and LPT hardware in order to retain the 
original, higher cyclic service life limit for these components. That 
action was prompted by new temperature data from engine testing, which 
were used in recalculating stress levels, and resulted in a change to 
the calculated cyclic service life limit. That condition, if not 
corrected, could result in HPT or LPT failure, which may result in an 
uncontained engine failure and possible damage to the aircraft.
    Since the issuance of that AD, the FAA received comments from 
operators describing confusion as to which 2nd stage HPT hubs, 
identified by part number (P/N), needed to be removed prior to the new 
life limit, in accordance with paragraph (f) of the compliance section.
    Since an unsafe condition has been identified that is likely to 
exist or develop on other engines of this same type design, this AD 
revises AD 96-18-08 to clarify questions from operators regarding 2nd 
stage HPT hub detail vs. P/Ns in paragraph (f) of the compliance 
section.
    Since a situation exists that requires the immediate adoption of 
this regulation, it is found that notice and opportunity for prior 
public comment hereon are impracticable, and that good cause exists for 
making this amendment effective in less than 30 days.

Comments Invited

    Although this action is in the form of a final rule that involves 
requirements affecting flight safety and, thus, was not preceded by 
notice and an opportunity for public comment, comments are invited on 
this rule. Interested persons are invited to comment on this 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 under the caption ADDRESSES. All 
communications received on or before the closing date for comments will 
be considered, and this rule may be amended in light of the comments 
received. Factual information that supports the commenter's ideas and 
suggestions is extremely helpful in evaluating the effectiveness of the 
AD action and determining whether additional rulemaking action would be 
needed.
    Comments are specifically invited on the overall regulatory, 
economic, environmental, and energy aspects of the rule that might 
suggest a need to modify the 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 that 
summarizes each FAA-public contact concerned with the substance of this 
AD 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 95-ANE-37.'' The postcard will be date stamped and 
returned to the commenter.
    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.
    The FAA has determined that this regulation is an emergency 
regulation that must be issued immediately to correct an unsafe 
condition in aircraft, and is not a ``significant regulatory action'' 
under Executive Order 12866.
    It has been determined further that this action involves an 
emergency regulation under DOT Regulatory Policies and Procedures (44 
FR 11034, February 26, 1979). If it is determined that this emergency 
regulation otherwise would be significant under DOT Regulatory Policies 
and Procedures, a final regulatory evaluation will be prepared and 
placed in the Rules Docket. A copy of it, if filed, 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. 106(g), 40113, 44701.


Sec. 39.13  [Amended]

    2. Section 39.13 is amended by removing Amendment 39-9732 (61 FR 
50984, September 30, 1996) and by adding a new airworthiness directive, 
Amendment 39-10857, to read as follows:

96-18-08 R1  Pratt & Whitney: Amendment 39-10857. Docket 95-ANE-37. 
Revises AD 96-18-08, Amendment 39-9732.

    Applicability: Pratt & Whitney Models PW2037, PW2037(M), PW2040, 
PW2240, and PW2337 turbofan engines, installed on but not limited 
to, Boeing 757 series and Ilyushin IL96 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 (o) 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 high pressure turbine (HPT) or low pressure turbine 
(LPT) failure, which may result in an uncontained engine failure and 
possible damage to the aircraft, accomplish the following:
    (a) Remove from service 1st stage HPT disks, Part Number (P/N) 
1A5301, prior to exceeding 5,000 total part cycles since new (TPC), 
if installed with blade retaining plate, P/N 1A6998, and replace 
with serviceable parts. If blade retaining plate, P/N 1A6998,

[[Page 57050]]

has not been installed on disk, P/N 1A5301, the disk may accumulate 
15,000 TPC prior to removal from service.
    (b) Remove from service 1st stage HPT blade retaining plates, P/
N 1A6998, prior to exceeding 5,000 TPC, and replace with serviceable 
parts. If rework is accomplished prior to exceeding 5,000 TPC in 
accordance with the Accomplishment Instructions of PW Alert Service 
Bulletin (ASB) No. PW2000 A72-82, Revision 1, dated April 25, 1986; 
Revision 2, dated July 17, 1986; Revision 3, dated November 7, 1986; 
or Revision 4, dated June 18, 1987, and reidentified as assembly P/N 
1B2373, the blade retaining plate may accumulate 15,000 TPC prior to 
removal from service.
    (c) Remove from service 2nd stage HPT blade retaining plates, P/
N 1B0450, prior to exceeding 7,000 TPC, and replace with serviceable 
parts.
    (d) Remove from service 2nd stage HPT blade retaining plates, P/
N 1B0945 (assembly P/N 1B0947), and replace with serviceable parts, 
in accordance with the Accomplishment Instructions of PW ASB No. 
PW2000 A72-228, Revision 2, dated May 10, 1988; Revision 3, dated 
August 25, 1988; or Revision 4, dated November 9, 1988, as follows:
    (1) Prior to exceeding 5,000 TPC, for retaining plates that have 
not been inspected in accordance with the Accomplishment 
Instructions of the above ASB prior to 3,000 TPC.
    (2) Prior to exceeding 8,000 TPC, for retaining plates that have 
been inspected in accordance with the Accomplishment Instructions of 
the above ASB prior to 3,000 TPC.
    (e) Remove from service 2nd stage HPT hubs, P/N's 1A8302, 
1B1002, 1B1202, or 1B4902 prior to exceeding 7,500 TPC, and replace 
with serviceable hubs. Hubs may accumulate 15,000 TPC prior to 
removal from service if they are inspected at intervals that do not 
exceed 6,000 cycles in service since last inspection, in accordance 
with the Accomplishment Instructions of PW Service Bulletin (SB) No. 
PW2000 72-450, Original, dated March 13, 1992; Revision 1, dated 
March 26, 1992; Revision 2, dated April 7, 1992; Revision 3, dated 
May 29, 1992; Revision 4, dated August 28, 1992; ASB No. PW2000 72-
450, Revision 5, dated May 28, 1994; or Revision 6, dated July 9, 
1996.
    (f) Remove from service all suspect 2nd stage HPT hubs, P/N 
1B6602, prior to exceeding 7,500 TPC, and replace with serviceable 
hubs. The suspect hubs are identified at the assembly level, P/N 
1B6232, in Section 1, Planning Information contained in PW SB No. 
PW2000 72-501, dated September 30, 1993. Hubs may accumulate 15,000 
TPC prior to removal from service if hub assemblies are inspected 
prior to 7,500 TPC to verify scarf cut blades are installed and to 
inspect the blade platform rail fillet radii dimensions, in 
accordance with the Accomplishment Instructions of PW SB No. PW2000 
72-501, dated September 30, 1993. Hub assemblies found with non-
scarf cut blades must be reinspected at intervals not to exceed 
6,000 TPC since last inspection. Blades found with under minimum 
rail fillet radii dimensions must be scrapped.
    (g) Remove from service HPT lenticular airseal, P/N 1A8209, 
prior to exceeding 4,000 TPC, and replace with serviceable airseals. 
Airseals may accumulate 15,000 TPC prior to removal from service if:
    (1) Inspected prior to exceeding 4,000 TPC, and thereafter 
inspected at intervals not to exceed 250 cycles in service since 
last inspection, in accordance with Compliance Paragraph E of the 
Accomplishment Instructions of PW ASB No. PW2000 A72-220, Revision 
3, dated April 13, 1989, or Revision 4, dated September 20, 1989; or
    (2) The 2nd stage HPT case and vane assembly is reworked and 
reidentified prior to exceeding 4,000 TPC, in accordance with the 
Accomplishment Instructions of PW SB No. PW2000 72-233, Revision 2, 
dated September 27, 1988, or Revision 3, dated May 30, 1989.
    (h) For PW2037, PW2037(M), and PW2337 model engines, remove from 
service 4th stage LPT disks, P/N's 8A1024, 8A1534, or 8A2137 prior 
to exceeding 17,000 TPC, and replace with serviceable disks.
    (i) For PW2040 and PW2240 model engines, remove from service 4th 
stage LPT disks, P/N's 8A1534 or 8A2137, prior to exceeding 15,000 
TPC, and replace with serviceable disks.
    (j) Remove from service 3rd stage LPT airsealing ring supports, 
P/N 8A1783, and replace with serviceable parts, as follows:
    (1) For PW2040 and PW2240 model engines, prior to exceeding 
15,000 TPC.
    (2) For PW2037, PW2037(M), and PW2337 model engines, prior to 
exceeding 17,000 TPC. Airsealing ring supports may accumulate 20,000 
TPC prior to removal from service if they were fluorescent penetrant 
inspected in accordance with Section 72-53-00 of PW2000 Engine 
Manual, P/N 1A6231.
    (k) For PW2037, PW2037(M), and PW2337 model engines, remove from 
service prior to exceeding 17,000 TPC, and replace with serviceable 
parts, as follows:
    (1) 4th stage LPT airseal, P/N's 8A1014 or 8A1805.
    (2) 5th stage LPT airseal, P/N's 8A1015 or 8A1806.
    (3) 7th stage LPT airseal, P/N's A8A1017, A8A1808, 8A2097, or 
A8A2097.
    (l) Parts listed in paragraph (m) of this AD may accumulate 
20,000 TPC prior to removal from service if they were fluorescent 
penetrant inspected for cracks between 12,000 TPC and 17,000 TPC in 
accordance with Section 72-53-00 of PW2000 Engine Manual, P/N 
1A6231.
    (m) For PW2040 and PW2240 model engines, remove from service 
prior to exceeding 15,000 TPC, and replace with serviceable parts, 
as follows:
    (1) 4th stage LPT airseal, P/N's 8A1014 or 8A1805.
    (2) 5th stage LPT airseal, P/N's 8A1015 or 8A1806.
    (3) 7th stage LPT airseal, P/N's A8A1017, A8A1808, 8A2097, or 
A8A2097.
    (n) Parts listed in paragraph (m) of this AD may accumulate the 
following TPC prior to removal if they were fluorescent penetrant 
inspected for cracks between 10,000 TPC and 15,000 TPC in accordance 
with Section 72-53-00 of PW2000 Engine Manual, P/N 1A6231:
    (1) 4th stage LPT airseal, P/N's 8A1014 or 8A1805, prior to 
exceeding 18,000 TPC.
    (2) 5th stage LPT airseal, P/N's 8A1015 or 8A1806, prior to 
exceeding 19,000 TPC.
    (3) 7th stage LPT airseal, P/N's A8A1017, A8A1808, 8A2097, or 
A8A2097, prior to exceeding 20,000 TPC.
    (o) An alternative method of compliance or adjustment of the 
initial compliance time that provides an acceptable level of safety 
may be used if approved by the Manager, Engine Certification Office. 
Operators shall submit their requests 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 AD, if any, may be 
obtained from the Engine Certification Office.

    (p) 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 requirements of this AD can be accomplished.
    (q) The actions required by this AD shall be done in accordance 
with the following PW service documents:

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          Document No.                    Pages                 Revision                       Date
----------------------------------------------------------------------------------------------------------------
ASB No. PW2000:
    A72-82......................  1...................  1.......................  April 25, 1986.
                                  2-6.................  Original................  June 7, 1985.
                                  7-9.................  1.......................  April 25, 1986.
                                  10..................  Original................  June 7, 1985.
                                  11..................  1.......................  April 25, 1986.
      Total Pages: 11.
ASB No. PW2000:
    A72-82......................  1...................  2.......................  July 17, 1986.
                                  2-6.................  Original................  June 7, 1985.
                                  7-9.................  1.......................  April 25, 1986.
                                  10..................  Original................  June 7, 1985.

[[Page 57051]]

                                  11..................  2.......................  July 17, 1986.
      Total Pages: 11.
ASB No. PW2000:
    A72-82......................  1-4.................  3.......................  November 7, 1986.
                                  5,6.................  Original................  June 7, 1985.
                                  7-14................  3.......................  November 7, 1986.
      Total Pages: 14.
ASB No. PW2000:
    A72-82......................  1...................  4.......................  June 18, 1987.
                                  2-4.................  3.......................  November 7, 1986.
                                  5,6.................  Original................  June 7, 1985.
                                  7-12................  3.......................  November 7, 1986.
                                  13..................  4.......................  June 18, 1987.
                                  14..................  3.......................  November 7, 1986.
      Total Pages: 14.
ASB No. PW2000:
    A72-228.....................  1...................  2.......................  May 10, 1988.
                                  2...................  Original................  July 6, 1987.
                                  3...................  2.......................  May 10, 1988.
                                  4...................  1.......................  March 29, 1988.
                                  5-26................  2.......................  May 10, 1988.
      Total Pages: 26.
ASB No. PW2000:
    A72-228.....................  1...................  3.......................  August 25, 1988.
                                  2...................  Original................  July 6, 1987.
                                  3...................  2.......................  May 10, 1988.
                                  4...................  3.......................  August 25, 1988.
                                  5-19................  2.......................  May 10, 1988.
                                  20..................  3.......................  August 25, 1988.
                                  21, 22..............  2.......................  May 10, 1988.
                                  23..................  3.......................  August 25, 1988.
                                  24-26...............  2.......................  May 10, 1988.
      Total Pages: 26.
ASB No. PW2000:
    A72-228.....................  1...................  4.......................  November 9, 1988.
                                  2...................  Original................  July 6, 1987.
                                  3...................  4.......................  November 9, 1988.
                                  4...................  3.......................  August 25, 1988.
                                  5-19................  2.......................  May 10, 1988.
                                  20..................  3.......................  August 25, 1988.
                                  21-22...............  2.......................  May 10, 1988.
                                  23..................  3.......................  August 25, 1988.
                                  24-26...............  4.......................  November 9, 1988.
      Total Pages: 26.
SB No. PW2000:
    72-450......................  1-26................  Original................  March 13, 1992.
      Total Pages: 26.
SB No. PW2000:
    72-450......................  1...................  1.......................  March 26, 1992.
                                  2-11................  Original................  March 13, 1992.
                                  12-13...............  1.......................  March 26, 1992.
                                  14,15...............  Original................  March 13, 1992.
                                  16,17...............  1.......................  March 26, 1992.
                                  18-21...............  Original................  March 13, 1992.
                                  22,23...............  1.......................  March 26, 1992.
                                  24,25...............  Original................  March 13, 1992.
                                  26..................  1.......................  March 26, 1992.
      Total Pages: 26.
SB No. PW2000:
    72-450......................  1...................  2.......................  April 7, 1992.
                                  2,3.................  Original................  March 13, 1992
                                  4,5.................  2.......................  April 7, 1992.
                                  2-11................  Original................  March 13, 1992.
                                  12..................  1.......................  March 26, 1992.
                                  13..................  2.......................  April 7, 1992.
                                  14,15...............  Original................  March 13, 1992.
                                  16,17...............  1.......................  March 26, 1992.
                                  18-21...............  Original................  March 13, 1992.
                                  22,23...............  1.......................  March 26, 1992.
                                  24,25...............  Original................  March 13, 1992.
                                  26..................  1.......................  March 26, 1992.
      Total Pages: 26.
SB No. PW2000:
    72-450......................  1-5.................  3.......................  May 29, 1992.

[[Page 57052]]

                                  6-11................  Original................  March 13, 1992.
                                  12..................  1.......................  March 26, 1992.
                                  13..................  3.......................  May 29, 1992.
                                  14..................  Original................  March 13, 1992.
                                  15-29...............  3.......................  May 29, 1992.
      Total Pages: 29.
SB No. PW2000:
    72-450......................  1...................  4.......................  August 28, 1992.
                                  2-5.................  3.......................  May 29, 1992.
                                  6-11................  Original................  March 13, 1992.
                                  12..................  1.......................  March 26, 1992.
                                  13..................  3.......................  May 29, 1992.
                                  14..................  Original................  March 13, 1992.
                                  15..................  4.......................  August 28, 1992.
                                  16..................  3.......................  May 29, 1992.
                                  17..................  4.......................  August 28, 1992.
                                  18-29...............  3.......................  May 29, 1992.
      Total Pages: 29.
ASB No. PW2000:
    72-450......................  1...................  5.......................  May 28, 1994.
                                  2...................  4.......................  May 28, 1994.
                                  3-5.................  3.......................  May 29, 1992.
                                  6-11................  Original................  March 13, 1992.
                                  12..................  1.......................  March 26, 1992.
                                  13..................  3.......................  May 29, 1992.
                                  14..................  Original................  March 13, 1992.
                                  15..................  4.......................  August 28, 1992.
                                  16..................  3.......................  May 29, 1992.
                                  17..................  4.......................  August 28, 1992.
                                  18-29...............  3.......................  May 29, 1992.
      Total Pages: 29.
ASB No. PW2000:
    72-450......................  1...................  6.......................  July 9, 1996.
                                  2...................  4.......................  May 28, 1994.
                                  3-5.................  3.......................  May 29, 1992.
                                  6-11................  Original................  March 13, 1992.
                                  12..................  1.......................  March 26, 1992.
                                  13..................  3.......................  May 29, 1992.
                                  14..................  Original................  March 13, 1992.
                                  15..................  4.......................  August 28, 1992.
                                  16..................  3.......................  May 29, 1992.
                                  17..................  4.......................  August 28, 1992.
                                  18-28...............  3.......................  May 29, 1992.
                                  29..................  6.......................  July 9, 1996.
      Total Pages: 29.
ASB No. PW72-501                  1-12................  Original................  September 30, 1993.
      Total Pages: 12.
ASB No. PW2000:
    A72-220.....................  1...................  3.......................  April 13, 1989.
                                  2...................  1.......................  July 29, 1987.
                                  3-26................  3.......................  April 13, 1989.
      Total Pages: 26.
ASB No. PW2000:
    A72-220.....................  1...................  4.......................  September 20, 1989.
                                  2...................  1.......................  July 29, 1987.
                                  3-6.................  3.......................  April 13, 1989.
                                  7-9.................  4.......................  September 20, 1989.
                                  10-16...............  3.......................  April 13, 1989.
                                  17-27...............  4.......................  September 20, 1989.
      Total Pages: 27.
SB No. PW2000:
    72-233......................  1,2.................  2.......................  September 27, 1988.
                                  3-7.................  Original................  August 7, 1987.
                                  8...................  1.......................  January 22, 1988.
                                  9,10................  2.......................  September 27, 1988.
      Total Pages: 10.
SB No. PW2000:
    72-233......................  1-4.................  3.......................  May 30, 1989.
                                  5...................  Original................  August 7, 1987.
                                  6...................  3.......................  May 30, 1989.
                                  7...................  Original................  August 7, 1987.
                                  8...................  1.......................  January 22, 1988.
                                  9,10................  3.......................  May 30, 1989.
      Total Pages: 10.
----------------------------------------------------------------------------------------------------------------


[[Page 57053]]

    The incorporation by reference of these service documents was 
approved previously by the Director of the Federal Register as of 
November 29, 1996 (61 FR 50984, September 30, 1996). Copies may be 
obtained from Pratt & Whitney, Publications Department, Supervisor 
Technical Publications Distribution, M/S 132-30, 400 Main St., East 
Hartford, CT 06108; telephone (860) 565-7700, fax (860) 565-4503. 
Copies may be inspected at the FAA, New England Region, Office of 
Regional 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.
    (r) This amendment becomes effective on November 10, 1998.

    Issued in Burlington, Massachusetts, on October 19, 1998.
David A. Downey,
Assistant Manager, Engine and Propeller Directorate, Aircraft 
Certification Service.
[FR Doc. 98-28534 Filed 10-23-98; 8:45 am]
BILLING CODE 4910-13-U