[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:

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