[Federal Register Volume 63, Number 239 (Monday, December 14, 1998)]
[Rules and Regulations]
[Pages 68674-68675]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 98-32800]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. 98-ANE-06-AD; Amendment 39-10940; AD 98-25-14]
RIN 2120-AA64
Airworthiness Directives; Rolls-Royce Limited, Bristol Engines
Division and Rolls-Royce (1971) Limited, Bristol Engines Division Viper
Series Turbojet Engines
AGENCY: Federal Aviation Administration, DOT.
ACTION: Final rule.
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SUMMARY: This amendment adopts a new airworthiness directive (AD),
applicable to Rolls-Royce Limited, Bristol Engines Division and Rolls-
Royce (1971) Limited, Bristol Engines Division, Viper series turbojet
engines, that requires a one-time visual inspection of the barometric
flow control unit (BFCU) augmentor and bypass valve joint washer for
joint washer integrity, and replacement, if necessary, with serviceable
parts. This amendment is prompted by a report of a high pressure fuel
leak at the BFCU augmentor and bypass valve assembly joint, washer
interface. The actions specified by this AD are intended to prevent a
high pressure fuel leak, which could result in an engine nacelle fire
and damage to the aircraft.
DATES: Effective February 12, 1999.
The incorporation by reference of certain publications listed in
the regulations is approved by the Director of the Federal Register as
of February 12, 1999.
ADDRESSES: The service information referenced in this AD may be
obtained from Rolls-Royce Limited, Bristol Engines Division, 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 Federal Aviation Administration (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: 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: A proposal to amend part 39 of the Federal
Aviation Regulations (14 CFR part 39) to include an airworthiness
directive (AD) that is applicable to Rolls-Royce Limited, Bristol
Engines Division, (R-R) Viper Mk. 521, 522, 526 and 601 series turbojet
engines was published in the Federal Register on April 30, 1998 (63 FR
23688). That action proposed to require a one-time inspection of BFCU
augmentor and bypass valve joint washer for joint washer integrity, and
replacement, if necessary, with serviceable parts in accordance with R-
R Alert Service Bulletins (ASBs) Nos. 73-A120, 73-A121, 73-A68, 73-A69,
73-A35, and 73-A36, dated November 1997.
Interested persons have been afforded an opportunity to participate
in the making of this amendment. No comments were received on the
proposal or the FAA's determination of the cost to the public. The FAA
has determined that air safety and the public interest require the
adoption of the rule as proposed.
There are approximately 140 engines of the affected design in the
worldwide fleet. The FAA estimates that 52 engines installed on
aircraft of U.S. registry will be affected by this AD, that it will
take approximately 5 work hours per engine to accomplish the required
actions, and that the average labor rate is $60 per work hour. Based on
these figures, the total cost impact of the AD on U.S. operators is
estimated to be $15,600.
The regulations adopted herein will not have substantial direct
effects on the States, on the relationship between the national
government and the States, or on the distribution of power and
responsibilities among the various levels of government. Therefore, in
accordance with Executive Order 12612, it is determined that this final
rule does not have sufficient federalism implications to warrant the
preparation of a Federalism Assessment.
For the reasons discussed above, I certify that this action (1) is
not a ``significant regulatory action'' under Executive Order 12866;
(2) is not a ``significant rule'' under DOT Regulatory Policies and
Procedures (44 FR 11034, February 26, 1979); and (3) will not have a
significant economic impact, positive or negative, on a substantial
number of small entities under the criteria of the Regulatory
Flexibility Act. A final evaluation has been prepared for this action
and it is contained in the Rules Docket. A copy of it may be obtained
from the Rules Docket at the location provided under the caption
ADDRESSES.
List of Subjects in 14 CFR Part 39
Air Transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.
Adoption of the Amendment
Accordingly, pursuant to the authority delegated to me by the
Administrator, the Federal Aviation Administration amends part 39 of
the Federal Aviation Regulations (14 CFR part 39) as follows:
PART 39--AIRWORTHINESS DIRECTIVES
1. The authority citation for part 39 continues to read as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701.
Sec. 39.13 [Amended]
2. Section 39.13 is amended by adding the following new
airworthiness directive:
98-25-14 Rolls-Royce plc: Amendment 39-10940. Docket 98-ANE-06-AD.
Applicability: Rolls-Royce plc (R-R) Viper Mk. 521, 522, 526 and
601 series turbojet engines, installed on but not limited to
Raytheon (formerly British Aerospace, Hawker Siddeley) Models BH.125
and 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 (d) of this AD. The request should include an assessment
of the effect of the modification,
[[Page 68675]]
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 a high pressure fuel leak, which could result in an
engine nacelle fire and damage to the aircraft, accomplish the
following:
(a) For R-R Viper Mk. 521, and 522 series engines, perform a
one-time inspection of the barometric flow control unit (BFCU)
augmentor and bypass valve joint washer for joint washer integrity,
and replace, if necessary, with serviceable parts, in accordance
with R-R Alert Service Bulletins (ASBs) Nos. 73-A120 and 73-A121, as
applicable, dated November 1997, as follows:
(1) For engines with less than 200 hours time in service (TIS)
since new, overhaul, or repair of the BFCU, inspect within 2 months,
or 100 hours TIS after the effective date of this AD, whichever
occurs first.
(2) For engines with 200 or more hours TIS since new, overhaul,
or repair of the BFCU, inspect at the next engine removal after the
effective date of this AD.
(b) For R-R Viper Mk. 526 series engines, perform a one-time
inspection of the barometric flow control unit (BFCU) augmentor and
bypass valve joint washer for joint washer integrity, and replace,
if necessary, with serviceable parts, in accordance with R-R ASBs
Nos. 73-A68 and 73-A69, as applicable, dated November 1997, as
follows:
(1) For engines with less than 200 hours time in service (TIS)
since new, overhaul, or repair of the BFCU, inspect within 2 months,
or 100 hours TIS after the effective date of this AD, whichever
occurs first.
(2) For engines with 200 or more hours TIS since new, overhaul,
or repair of the BFCU, inspect at the next engine removal after the
effective date of this AD.
(c) For R-R Viper Mk. 601 series engines, perform a one-time
inspection of the BFCU augmentor and bypass valve joint washer for
joint washer integrity, and replace, if necessary, with serviceable
parts, in accordance with R-R ASBs Nos. 73-A35 and 73-A36, as
applicable, dated November 1997, as follows:
(1) For engines with less than 200 hours TIS since new,
overhaul, or repair of the BFCU, inspect within 2 months, or 100
hours TIS after the effective date of this AD, whichever occurs
first.
(2) For engines with 200 or more hours TIS since new, overhaul,
or repair of the BFCU, inspect at the next engine removal after the
effective date 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 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 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 requirements of this AD can be accomplished.
(f) The actions required by this AD shall be done in accordance
with the following R-R ASBs:
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Document No. Pages Date
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73-A35................................ 1-6 Nov. 1997.
Total Pages: 6.
73-A36................................ 1-6 Nov. 1997.
Total Pages: 6.
73-A68................................ 1-6 Nov. 1997.
Total Pages: 6.
73-A69................................ 1-6 Nov. 1997.
Total Pages: 6.
73-A120............................... 1-6 Nov. 1997.
Total Pages: 6.
73-A121............................... 1-6 Nov. 1997.
Total Pages: 6.
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This incorporation by reference was approved by the Director of
the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR
part 51. Copies may be obtained from Rolls-Royce Limited, Bristol
Engines Division, Technical Publications Department CLS-4, P.O. Box
3, Filton, Bristol, BS34 7QE England; telephone 117-979-1234, fax
117-979-7575. Copies may be inspected 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.
(g) This amendment becomes effective on February 12, 1999.
Issued in Burlington, Massachusetts, on November 30, 1998.
Jay J. Pardee,
Manager, Engine and Propeller Directorate, Aircraft Certification
Service.
[FR Doc. 98-32800 Filed 12-11-98; 8:45 am]
BILLING CODE 4910-13-U
