[Federal Register Volume 59, Number 240 (Thursday, December 15, 1994)]
[Unknown Section]
[Page 0]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 94-30179]
[[Page Unknown]]
[Federal Register: December 15, 1994]
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DEPARTMENT OF TRANSPORTATION
14 CFR Part 39
[Docket No. 93-ANE-29; Amendment 39-9088; AD 94-25-04]
Airworthiness Directives; Precision Airmotive Corporation
(Formerly Facet Aerospace Products and Marvel-Schebler) Model HA-6
Series Carburetors
AGENCY: Federal Aviation Administration, DOT.
ACTION: Final rule.
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SUMMARY: This amendment adopts a new airworthiness directive (AD),
applicable to certain Precision Airmotive Corporation (formerly Facet
Aerospace Products and Marvel-Schebler) Model HA-6 series carburetors,
that requires a modification in those carburetors not equipped with a
mixture control retainer clip. This amendment is prompted by eight
reports of excessive retention screw wear causing rough engine
operation or engine power loss on engines equipped with a Model HA-6
series carburetor between January 1986 and August 1992. The actions
specified by this AD are intended to prevent the interruption of fuel
flow to the engine caused by the mixture control shaft moving out of
position because of excessive wear of the mixture control shaft
retention screw.
DATES: Effective February 13, 1995.
The incorporation by reference of certain publications listed in
the regulations is approved by the Director of the Federal Register as
of February 13, 1995.
ADDRESSES: The service information referenced in this AD may be
obtained from Precision Airmotive Corporation, 3220 -100th Street
Southwest, Suite E, Everett, WA 98204; telephone (206) 353-8181, fax
(206) 348-3545. This information may be examined at the Federal
Aviation Administration (FAA), New England Region, Office of the
Assistant Chief 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: Jon A. Regimbal, Aerospace Engineer,
Seattle Aircraft Certification Office, FAA, Transport Airplane
Directorate, 1601 Lind Avenue, SW., Renton, WA 98055-4056; telephone
(206) 227-2687, fax (206) 227-1181.
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 certain Precision Airmotive
Corporation (formerly Facet Aerospace Products and Marvel-Schebler)
Model HA-6 series carburetors was published in the Federal Register on
December 21, 1993 (58 FR 67381). That action proposed to require
installation of a retainer clip, replacement screw, and washer to
prevent movement of the existing mixture control shaft in the event of
excessive wear of the mixture control shaft retainer screw, in
accordance with Marvel-Schebler/Tillotson Service Bulletin (SB) No. A1-
78, dated September 1978.
Interested persons have been afforded an opportunity to participate
in the making of this amendment. Due consideration has been given to
the comment received.
The commenter (the manufacturer) states that only certain part
numbers of HA-6 series carburetors should be affected by the AD. The
affected carburetors were manufactured prior to 1979, after which a
modification to address mixture control shaft retention problems was
introduced and the part numbers were changed. The Federal Aviation
Administration (FAA) concurs. The applicability of this final rule has
been revised to include only carburetors identified by certain part
numbers. In addition, the manufacturer has issued Precision
Airworthiness Corporation Mandatory SB No. MSA-6, dated April 6, 1994,
that includes the revised effectivity limited by part numbers. This
final rule adds this SB as an additional means of compliance to the
original Marvel-Schebler/Tillotson SB. Finally, the economic analysis
has been revised to show the lower number of affected carburetors.
After careful review of the available data, including the comments
noted above, the FAA has determined that air safety and the public
interest require the adoption of the rule with the changes described
previously. The FAA has determined that these changes will neither
increase the economic burden on any operator nor increase the scope of
the AD.
There are approximately 5,000 carburetors of the affected design in
the worldwide fleet, but the number of carburetors installed on
aircraft of U.S. registry that will be affected by this AD is unknown.
The FAA estimates that it will take approximately 1 work hour per
carburetor to accomplish the required actions, and that the average
labor rate is $55 per work hour. Required parts will cost approximately
$34 per carburetor. Based on these figures, the total cost impact of
the AD on worldwide operators is estimated to be $445,000.
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. App. 1354(a), 1421 and 1423; 49 U.S.C.
106(g); and 14 CFR 11.89.
Sec. 39.13 [Amended]
2. Section 39.13 is amended by adding the following new
airworthiness directive:
94-25-04 Precision Airmotive Corporation (formerly Facet Aerospace
Products and Marvel-Schebler): Amendment 39-9088. Docket 93-ANE-29.
Applicability: Precision Airmotive Corporation (formerly Facet
Aerospace Products and Marvel-Schebler) Model HA-6 series
carburetors with part numbers 10-5092, 10-5180, 10-5189, 10-5200,
10-5200-1, 10-5201-11, 10-5206, 10-5206-1, 10-5210, 10-5211, 10-
5211-1, 10-5214, 10-5215, 10-5221, 10-5227. These carburetors are
installed on but not limited to reciprocating engine powered
aircraft manufactured by Beech, Cessna, Piper, and Mooney.
Compliance: Required as indicated, unless accomplished
previously.
To prevent the interruption of fuel flow to the engine caused by
the mixture control shaft moving out of position because of
excessive wear of the mixture control shaft retention screw,
accomplish the following:
(a) For affected carburetors not equipped with a mixture control
shaft retainer clip (P/N 55-A239), screw (P/N 15-B395), and washer
(P/N 78-A292), install these items within 12 months after the
effective date of this airworthiness directive (AD) in accordance
with Marvel-Schebler/Tillotson Service Bulletin (SB) No. A1-78,
dated September 1978, or Precision Airmotive Corporation SB No. MSA-
6, dated April 6, 1994.
(b) 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, Seattle Aircraft Certification
Office. The request should be forwarded through an appropriate FAA
Principal Maintenance Inspector, who may add comments and then send
it to the Manager, Seattle Aircraft Certification Office.
Note: Information concerning the existence of approved
alternative methods of compliance with this airworthiness directive,
if any, may be obtained from the Seattle Aircraft Certification
Office.
(c) Special flight permits may be issued in accordance with
Secs. 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.
(d) The installation shall be done in accordance with the
following service bulletins:
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Document No. Pages Date
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Marvel Schebler/ Tillotson SB No. A1-78... 1-2 September 1978
Total Pages: 2.
Precision Airmotive Corporation SB No. MSA- 1-3 April 6, 1994.
6.
Total Pages: 3.
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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 Precision Airmotive Corporation, 3220 -
100th Street Southwest, Suite E, Everett, WA 98204; telephone (206)
353-8181, fax (206) 348-3545. Copies may be inspected at the FAA, New
England Region, Office of the Assistant Chief 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.
(e) This amendment becomes effective on February 13, 1995.
Issued in Burlington, Massachusetts, on December 1, 1994.
James C. Jones,
Acting Manager, Engine and Propeller Directorate, Aircraft
Certification Service.
[FR Doc. 94-30179 Filed 12-14-94; 8:45 am]
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