[Federal Register Volume 62, Number 96 (Monday, May 19, 1997)]
[Proposed Rules]
[Pages 27211-27212]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 97-13082]


      

  Federal Register / Vol. 62, No. 96 / Monday, May 19, 1997 / Proposed 
Rules  

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 97-SW-04-AD]


Airworthiness Directives; Robinson Helicopter Company Model R22 
Helicopters

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 Robinson Helicopter Company 
(Robinson) Model R22 helicopters with a Lycoming O-360-J2A engine 
installation. This proposal would require replacing the carburetor and 
carburetor air temperature (CAT) gage with an improved carburetor that 
does not require manual leaning of the fuel/air mixture during flight, 
and a remarked CAT gage; and revising the Rotorcraft Flight Manual to 
remove the reference to leaning the engine. This proposal is prompted 
by a report from the Civil Aviation Authority of Great Britain that 
cautioned that the mixture control could inadvertently be placed in the 
idle cutoff position during in-flight manual leaning of the fuel/air 
mixture in the carburetor of the Lycoming O-360-J2A engine. The actions 
specified by the proposed AD are intended to prevent inadvertent 
placement of the mixture control to the idle cutoff position during in-
flight leaning of the engine, which could result in an engine shutdown 
and subsequent loss of control of the helicopter.

DATES: Comments must be received by July 18, 1997.

ADDRESSES: Submit comments in triplicate to the Federal Aviation 
Administration (FAA), Office of the Assistant Chief Counsel, Attention: 
Rules Docket No. 97-SW-04-AD, 2601 Meacham Blvd., Room 663, Fort Worth, 
Texas 76137. Comments may be inspected at this location between 9:00 
a.m. and 3:00 p.m., Monday through Friday, except Federal holidays.
    The service information referenced in the proposed rule may be 
obtained from Robinson Helicopter Company, 2901 Airport Drive, 
Torrance, California 90505. This information may be examined at the 
FAA, Office of the Assistant Chief Counsel, 2601 Meacham Blvd., Room 
663, Fort Worth, Texas.

FOR FURTHER INFORMATION CONTACT: Ms. Elizabeth Bumann, Aerospace 
Engineer, FAA, Los Angeles Aircraft Certification Office, Propulsion 
Branch, 3960 Paramount Boulevard, Lakewood, California 90712, telephone 
(562) 627-5265, fax (562) 627-5210.

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 No. 97-SW-04-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, Office of the Assistant Chief Counsel, Attention: Rules 
Docket No. 97-SW-04-AD, 2601 Meacham Blvd., Room 663, Fort Worth, Texas 
76137.

Discussion

    This document proposes the adoption of a new AD that is applicable 
to Robinson Model R22 helicopters, serial numbers (S/N) 2571 through 
2664. This proposal would require replacing the MA-4-5 carburetor and 
CAT gage, part number (P/N) C604-6, with an airworthy MA-4SPA 
carburetor and CAT gage, P/N A606-2; and mandating the Robinson Model 
R22 Rotorcraft Flight Manual (RFM) revision dated February 6, 1997 be 
inserted into the RFM. These revised supplements to the RFM do not 
provide for leaning of the carburetor mixture. This proposal is 
prompted by a report from the Civil Aviation Authority of Great Britain 
that cautioned that the mixture control could inadvertently be placed 
in the idle cutoff position during in-flight leaning of the O-360-J2A 
engine. This condition, if not corrected, could result in inadvertent 
placement of the mixture control to the idle cutoff position during in-
flight leaning of the engine, which could result in an engine shutdown 
during flight and subsequent loss of control of the helicopter.
    The FAA has reviewed Robinson Helicopter Company R22 Service 
Bulletin SB-82, dated March 3, 1997, and Robinson Helicopter Company 
KI-114 O-360 Engine Carburetor Change Kit instructions, Revision A, 
dated March 6, 1997, which describe procedures for removing the MA-4-5 
carburetor and the CAT gage, P/N C604-6, and replacing them with an 
airworthy MA-4SPA carburetor and CAT gage, P/N A604-2, and revising the 
RFM Section 9, Supplements 7 (for Beta II) and 8 (for Mariner II) to 
eliminate the leaning procedure.
    Since an unsafe condition has been identified that is likely to 
exist or develop on other Robinson Model R22 helicopters of the same 
type design, the proposed AD would require, within 50 hours time-in-
service (TIS) after the effective date of this AD, removing the MA-4-5 
carburetor and CAT gage, P/N C604-6, replacing them with an airworthy 
MA-4SPA carburetor and

[[Page 27212]]

CAT gage, P/N A604-2, and revising the RFM. The actions would be 
required to be accomplished in accordance with the service bulletin 
compliance procedures and kit instructions described previously.
    The FAA estimates that 50 helicopters of U.S. registry would be 
affected by this proposed AD, that it would take approximately 5 work 
hours per helicopter to accomplish the proposed actions, and that the 
average labor rate is $60 per work hour. Required parts would cost 
approximately $3,641 per helicopter. Based on these figures, the total 
cost impact of the proposed AD on U.S. operators is estimated to be 
$197,050.
    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 a new airworthiness directive 
to read as follows:

Robinson Helicopter Company: Docket No. 97-SW-04-AD.

    Applicability: Model R22 helicopters, serial numbers (S/N) 2571 
through 2664, certificated in any category.

    Note 1: This AD applies to each helicopter 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 helicopters that have been modified, 
altered, or repaired so that the performance of the requirements of 
this AD is affected, the owner/operator must use the authority 
provided in paragraph (c) to request approval from the FAA. This 
approval may address either no action, if the current configuration 
eliminates the unsafe condition, or different actions necessary to 
address the unsafe condition described in this AD. Such a request 
should include an assessment of the effect of the changed 
configuration on the unsafe condition addressed by this AD. In no 
case does the presence of any modification, alteration, or repair 
remove any helicopter from the applicability of this AD.
    Compliance: Required within 50 hours time-in-service after the 
effective date of this AD, unless accomplished previously.
    To prevent inadvertent placement of the mixture control to the 
idle cutoff position during in-flight leaning of the engine, which 
could result in an engine shutdown during flight and subsequent loss 
of control of the helicopter, accomplish the following:
    (a) Remove the MA-4-5 carburetor and carburetor air temperature 
(CAT) gage, part number (P/N) C604-6, and replace them with an 
airworthy MA-4SPA carburetor and remarked CAT gage, P/N A604-2, in 
accordance with Robinson Helicopter Company R22 Service Bulletin SB-
82, dated March 3, 1997, and Robinson Helicopter Company KI-114 O-
360 Engine Carburetor Change Kit instructions, Revision A, dated 
March 6, 1997.
    (b) Upon completion of paragraph (a) of this AD, insert the FAA-
approved R22 Pilot's Operating Handbook Section 9, Supplements 7 
(R22 Beta II) and 8 (R22 Mariner II), revised February 6, 1997, or a 
later FAA-approved revision, into the R22 Rotorcraft Flight Manual.
    (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, Los Angeles Aircraft Certification 
Office, FAA. Operators shall submit their requests through an FAA 
Principal Maintenance Inspector, who may concur or comment and then 
send it to the Manager, Los Angeles Aircraft Certification Office.

    Note 2: Information concerning the existence of approved 
alternative methods of compliance with this AD, if any, may be 
obtained from the Los Angeles Aircraft 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 helicopter to a location where 
the requirements of this AD can be accomplished.

    Issued in Fort Worth, Texas, on May 8, 1997.
Mark R. Schilling,
Acting Manager, Rotorcraft Directorate, Aircraft Certification Service.
[FR Doc. 97-13082 Filed 5-16-97; 8:45 am]
BILLING CODE 4910-13-U