[Federal Register Volume 63, Number 70 (Monday, April 13, 1998)]
[Proposed Rules]
[Pages 17972-17973]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 98-9581]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. 98-ANE-01-AD]
Airworthiness Directives; Rolls-Royce, plc Viper Models Mk.521,
and Mk.522 Turbojet 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 Rolls-Royce, plc (R-R) Viper
Models Mk.521, and Mk.522 series turbojet engines. This proposal would
require replacement of certain high pressure (HP) fuel pumps with an
improved design which is more tolerant of water contaminated, low
lubricity fuels. This proposal is prompted by reports of HP fuel pump
drive shaft failures resulting in inflight engine shutdowns and at
least two reported near dual engine events. These failures have been
attributed to the low lubricity properties of water contaminated fuel.
The actions specified by the proposed AD are intended to prevent HP
fuel pump failures, which can result in inflight engine shutdowns and
the possibility of dual engine events.
DATES: Comments must be received by June 12, 1998.
ADDRESSES: Submit comments in triplicate to the Federal Aviation
Administration (FAA), New England Region, Office of the Regional
Counsel, Attention: Rules Docket No. 98-ANE-01-AD, 12 New England
Executive Park, Burlington, MA 01803-5299. Comments may also be
submitted to the Rules Docket by using the following Internet address:
``[email protected]''.
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 Rolls-Royce, plc, Technical Publications Department CLS-
4, P.O. Box 3, Filton, Bristol, BS34 7QE England; telephone 117-979-
1234, fax 117-979-7575. 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: James Lawrence, Aerospace Engineer,
Engine Certification Office, FAA, Engine and Propeller Directorate, 12
New England Executive Park, Burlington, MA 01803-5299; telephone (781)
238-7176, 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 98-ANE-01-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. 98-ANE-01-AD, 12 New England Executive
Park, Burlington, MA 01803-5299.
Discussion
The Civil Aviation Authority (CAA), which is the airworthiness
authority for the United Kingdom (UK), recently notified the Federal
Aviation Administration (FAA) that an unsafe condition may exist on
Rolls-Royce, plc (R-R) Viper Models Mk.521, and Mk.522 series turbojet
engines. The CAA advises that they have received reports of 12
incidents of high pressure (HP) fuel pump failures, including two near
dual engine events, due to fuel pump drive shaft failure. Failures were
attributed to the low lubricity properties of water contaminated fuel.
This condition, if not corrected, could result in HP fuel pump
failures, which can result in inflight engine shutdowns and the
possibility of dual engine events.
Rolls-Royce, plc has issued Service Bulletins (SBs) No. 73-A115 and
73-A118, both Revision 1, dated February 1996, that specify replacing
affected HP fuel pumps with improved pumps. The CAA classified these
SBs mandatory and issued ADs 003-02-96 and 004-02-96 in order to assure
the airworthiness of these engines in the UK.
This engine model is manufactured in the UK and is type
certificated for operation in the United States under the provisions of
Section 21.29 of the Federal Aviation Regulations (14 CFR 21.29) and
the applicable bilateral airworthiness agreement. Pursuant to this
bilateral airworthiness agreement, the CAA has kept the FAA informed of
the situation described above. The FAA has examined the findings of the
CAA, reviewed all available information, and
[[Page 17973]]
determined that AD action is necessary for products of this type design
that are certificated for operation in the United States.
Since an unsafe condition has been identified that is likely to
exist or develop on other engines of the same type design registered in
the United States, the proposed AD would require replacement of certain
HP fuel pumps with improved pumps at the earliest of the following: 160
hours time in service (TIS) after the effective date of this AD, the
next shop visit after the effective date of this AD, or the next HP
fuel pump removal after the effective date of this AD. Compliance times
were determined in accordance with CAA recommendations and R-R risk
analysis. The actions would be required to be accomplished in
accordance with the SBs described previously.
There are approximately 280 engines of the affected design in the
worldwide fleet. The FAA estimates that 104 engines installed on
aircraft of U.S. registry would be affected by this proposed AD, that
it would take approximately 4 work hours per engine to accomplish the
proposed actions, and that the average labor rate is $60 per work hour.
Required parts would cost approximately $18,000 per engine. Based on
these figures, the total cost impact of the proposed AD on U.S.
operators is estimated to be $1,896,960.
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:
Rolls-Royce plc: Docket No. 98-ANE-01-AD.
Applicability: Rolls-Royce, plc (R-R) Viper Models Mk.521, and
Mk.522 turbojet engines, with high pressure (HP) fuel pumps, part
numbers (P/Ns) MGBB.167, MGBB.137, or MGBB.168, installed. These
engines are installed on but not limited to Raytheon (formerly
British Aerospace, Hawker Siddeley) Model DH.125 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 (c) 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 HP fuel pump failures, which can result in inflight
engine shutdowns and the possibility of dual engine events,
accomplish the following:
(a) Remove from service affected HP fuel pumps, and replace with
serviceable, improved HP fuel pumps, at the earliest of the
following: 160 hours time in service (TIS) after the effective date
of this AD, the next shop visit after the effective date of this AD,
or the next HP fuel pump removal after the effective date of this
AD, as follows:
(1) For HP fuel pumps installed on R-R Viper Mk.521 engines,
replace HP fuel pumps, P/N MGBB.167, with improved, serviceable fuel
pumps, P/N MGBB.182, in accordance with R-R SB No. 73-A118, Revision
1, dated February 1996.
(2) For HP fuel pumps installed on R-R Viper Mk.522 engines,
replace HP fuel pumps, P/Ns MGBB.137 or MGBB.168, with improved,
serviceable fuel pumps, P/N MGBB.183, in accordance with R-R SB No.
73-A115, Revision 1, dated February 1996.
(b) For the purpose of this AD, a shop visit is defined as the
induction of an engine into the shop for any reason.
(c) 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.
(d) 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.
Issued in Burlington, Massachusetts, on April 2, 1998.
Jay J. Pardee,
Manager, Engine and Propeller Directorate, Aircraft Certification
Service.
[FR Doc. 98-9581 Filed 4-10-98; 8:45 am]
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