[Federal Register Volume 66, Number 46 (Thursday, March 8, 2001)]
[Proposed Rules]
[Pages 13858-13860]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 01-5658]


 ========================================================================
 Proposed Rules
                                                 Federal Register
 ________________________________________________________________________
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 This section of the FEDERAL REGISTER contains notices to the public of 
 the proposed issuance of rules and regulations. The purpose of these 
 notices is to give interested persons an opportunity to participate in 
 the rule making prior to the adoption of the final rules.
 
 ========================================================================
 

  Federal Register / Vol. 66, No. 46 / Thursday, March 8, 2001 / 
Proposed Rules  

[[Page 13858]]



DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 2000-SW-48-AD]
RIN 2120-AA64


Airworthiness Directives; Bell Helicopter Textron, Inc., Model 
205A-1, 205B, 212, 412, 412EP, and 412CF 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) for Bell Helicopter Textron, Inc. (BHTI) Model 205A-1, 
205B, 212, 412, 412EP, and 412CF helicopters. The AD would require 
removing each existing tail rotor counterweight bellcrank (bellcrank) 
retention nut (retention nut), replacing each retention nut with a zero 
hours time-in-service (TIS) retention nut; and follow-up inspections of 
installed retention nuts. This proposal is prompted by an in-flight 
loss of a bellcrank due to failure of the retention nut. The actions 
specified by the proposed AD are intended to prevent failure of the 
retention nut, which could result in the bellcrank migrating off the 
crosshead spindle, loss of tail rotor control, and subsequent loss of 
control of the helicopter.

DATES: Comments must be received on or before May 7, 2001.

ADDRESSES: Submit comments in triplicate to the Federal Aviation 
Administration (FAA), Office of the Regional Counsel, Southwest Region, 
Attention: Rules Docket No. 2000-SW-48-AD, 2601 Meacham Blvd., Room 
663, Fort Worth, Texas 76137. You may also send comments electronically 
to the Rules Docket at the following address: [email protected]. 
Comments may be inspected at the Office of the Regional Counsel 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 Bell Helicopter Textron, Inc., P.O. Box 482, Fort Worth, 
Texas 76101, telephone (817) 280-3391, fax (817) 280-6466. This 
information may be examined at the FAA, Office of the Regional Counsel, 
Southwest Region, 2601 Meacham Blvd., Room 663, Fort Worth, Texas.

FOR FURTHER INFORMATION CONTACT: Michael Kohner, Aviation Safety 
Engineer, FAA, Rotorcraft Directorate, Rotorcraft Certification Office, 
Fort Worth, Texas 76193-0170, telephone (817) 222-5447, fax (817) 222-
5783.

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 document 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 mailed 
comments submitted in response to this proposal must submit a self-
addressed, stamped postcard on which the following statement is made: 
``Comments to Docket No. 2000-SW-48-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 Regional Counsel, Southwest Region, 
Attention: Rules Docket No. 2000-SW-48-AD, 2601 Meacham Blvd., Room 
663, Fort Worth, Texas 76137.

Discussion

    This document proposes the adoption of a new AD for BHTI Model 
205A-1, 205B, 212, 412, 412EP, and 412CF helicopters. The document 
proposes to require:
     Removing the two existing retention nuts within 100 hours 
TIS or 90 days, whichever occurs first;
     Installing a retention nut, part number MS14145L6 or 
MS17826-6, which are limited to a one-time installation;
     Inspecting the corrosion preventive compound (CPC) coating 
of the retention nut for deficiencies;
     Inspecting the retention nut for corrosion, mechanical 
damage, a crack, or looseness; and
     Replacing each retention nut, when necessary.
    This proposal is prompted by an in-flight loss of a bellcrank due 
to failure of the retention nut. The actions specified by the proposed 
AD are intended to prevent failure of the retention nut, which could 
result in the bellcrank migrating off the crosshead spindle, loss of 
tail rotor control, and subsequent loss of control of the helicopter
    The FAA has reviewed the following BHTI Alert Service Bulletins, 
which describe procedures for installing, inspecting, and replacing the 
retention nut:
     Bell Helicopter Textron, Inc. Alert Service Bulletin No. 
205-00-77, Revision A, dated September 13, 2000, which is applicable to 
Model 205A-1 helicopters;
     Bell Helicopter Textron, Inc. Alert Service Bulletin No. 
205B-00-31, Revision A, dated September 13, 2000, which is applicable 
to Model 205B helicopters;
     Bell Helicopter Textron, Inc. Alert Service Bulletin No. 
212-00-107, Revision A, dated September 13, 2000, which is applicable 
to Model 212 helicopters;
     Bell Helicopter Textron, Inc. Alert Service Bulletin No. 
412-00-102, Revision A, dated September 13, 2000, which is applicable 
to Model 412 and Model 412EP helicopters; and
     Bell Helicopter Textron, Inc. Alert Service Bulletin No. 
412CF-00-10,

[[Page 13859]]

Revision A, dated September 13, 2000, which is applicable to Model 
412CF helicopters.
    Since an unsafe condition has been identified that is likely to 
exist or develop on other BHTI Model 205A-1, 205B, 212, 412, 412EP, and 
412CF helicopters of the same type design, the proposed AD would 
require:
     Removing the two existing retention nuts within 100 hours 
TIS or 90 days, whichever occurs first;
     Installing a retention nut, part number MS14145L6 or 
MS17826-6, which are limited to a one-time installation;
     Inspecting the CPC coating of the retention nut for 
deficiencies;
     Inspecting the retention nut for corrosion, mechanical 
damage, a crack, or looseness; and
     Replacing each retention nut, when necessary.
    The actions would be required to be accomplished in accordance with 
the applicable alert service bulletins described previously.
    The FAA estimates that 423 helicopters of U.S. registry would be 
affected by this proposed AD, that it would take approximately 2.5 work 
hours per helicopter to replace each retention nut, and 0.5 work hour 
to inspect each retention nut once, and that the average labor rate is 
$60 per work hour. Required parts would cost approximately $7 per 
helicopter. Based on these figures, the total cost impact of the 
proposed AD on U.S. operators is estimated to be $155,241 to replace 
the retention nuts and inspect them once.
    The regulations proposed herein would not have a substantial direct 
effect 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, it 
is determined that this proposal would not have federalism implications 
under Executive Order 13132.
    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:

Bell Helicopter Textron, Inc.: Docket No. 2000-SW-48-AD.
    Applicability: Model 205A-1, 205B, 212, 412, 412EP, and 412CF 
helicopters, certificated in any category.

    Note 1: This AD applies to each helicopter identified in the 
preceding applicability provision, regardless of whether it has been 
otherwise 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 request approval for an 
alternative method of compliance in accordance with paragraph (f) 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 failure of the tail rotor counterweight bellcrank 
(bellcrank) retention nut (retention nut), which could result in the 
bellcrank migrating off the crosshead spindle, loss of tail rotor 
control, and subsequent loss of control of the helicopter, 
accomplish the following:
    (a) For Model 205A-1 helicopters:
    (1) Within 100 hours time-in-service (TIS) or 90 days after the 
effective date of this AD, whichever occurs first, remove the two 
existing retention nuts retaining the bellcranks, part number (P/N) 
212-010-709-001 or 212-011-705-001, and install zero hours TIS 
retention nuts, P/N MS14145L6 or MS17826-6, in accordance with 
paragraphs (1) through (5) of the Accomplishment Instructions in 
Bell Helicopter Textron, Inc. Alert Service Bulletin (ASB) 205-00-
77, Revision A, September 13, 2000 (205A-1 ASB). A used nut may not 
be installed.
    (2) At intervals not to exceed 100 hours TIS after accomplishing 
paragraph (a)(1) of this AD, inspect the retention nuts and 
corrosion preventive compound (CPC) coating in accordance with 
paragraph (6) of the Accomplishment Instructions of the 205A-1 ASB. 
Reapply the CPC coating if deficiencies are found in the coverage 
and protection of the area. Replace any retention nut with any 
corrosion, mechanical damage, a crack, or looseness with an 
airworthy new retention nut before further flight.
    (b) For Model 205B helicopters:
    (1) Within 100 hours TIS or 90 days after the effective date of 
this AD, whichever occurs first, remove the two existing retention 
nuts retaining the bellcranks, P/N 212-011-705-001, and install 
retention nuts, P/N MS14145L6 or MS17826-6, in accordance with 
paragraphs (1) through (5) of the Accomplishment Instructions in 
Bell Helicopter Textron, Inc. ASB 205B-00-31, Revision A, dated 
September 13, 2000 (205B ASB). A used nut may not be installed.
    (2) At intervals not to exceed 100 hours TIS after accomplishing 
paragraph (b)(1) of this AD, inspect the retention nuts and CPC 
coating in accordance with paragraph (6) of the Accomplishment 
Instructions in the 205B ASB. Reapply the CPC coating if 
deficiencies are found in the coverage and protection of the area. 
Replace any retention nut with any corrosion, mechanical damage, a 
crack, or looseness with an airworthy new retention nut before 
further flight.
    (c) For Model 212 helicopters:
    (1) Within 100 hours TIS or 90 days after the effective date of 
this AD, whichever occurs first, remove the two existing retention 
nuts retaining the bellcranks, P/N 212-010-709-001 or 212-011-705-
001, and install retention nuts, P/N MS14145L6 or MS17826-6, in 
accordance with paragraphs (1) through (5) of the Accomplishment 
Instructions in Bell Helicopter Textron, Inc. Alert Service Bulletin 
212-00-107, Revision A, dated September 13, 2000 (212 ASB). A used 
retention nut may not be installed.
    (2) At intervals not to exceed 100 hours TIS after accomplishing 
paragraph (c)(1) of this AD, inspect the retention nuts and CPC 
coating in accordance with paragraph (6) of the Accomplishment 
Instructions in the 212 ASB. Reapply the CPC coating if deficiencies 
are found in the coverage and protection of the area. Replace any 
retention nut with any corrosion, mechanical damage, a crack, or 
looseness with an airworthy new nut before further flight.
    (d) For Model 412 or 412EP helicopters:
    (1) Within 100 hours TIS or 90 days after the effective date of 
this AD, whichever occurs first, remove the two existing retention 
nuts retaining the bellcranks, P/N 212-011-705-001, and install 
retention nuts, P/N MS14145L6 or MS17826-6, in accordance with 
paragraphs (1) through (5) of the Accomplishment Instructions in 
Bell Helicopter Textron, Inc. ASB 412-00-102, Revision A, dated 
September 13, 2000 (412 ASB). A used nut may not be installed.
    (2) At intervals not to exceed 100 hours TIS after accomplishing 
paragraph (d)(1) of this AD, inspect the retention nuts and CPC 
coating in accordance with paragraph (6) of the Accomplishment 
Instructions in the 412 ASB. Reapply the CPC coating if deficiencies 
are found in the coverage and protection of the area. Replace any 
retention nut with any corrosion, mechanical damage, a crack, or 
looseness with an airworthy new retention nut before further flight.

[[Page 13860]]

    (e) For Model 412CF helicopters:
    (1) Within 100 hours TIS or 90 days after the effective date of 
this AD, whichever occurs first, remove the two existing retention 
nuts retaining the bellcranks, P/N 212-011-705-001, and install 
retention nuts, P/N MS14145L6 or MS17826-6, in accordance with 
paragraphs (1) through (5) of the Accomplishment Instructions in 
Bell Helicopter Textron, Inc. ASB 412CF-00-10, Revision A, September 
13, 2000 (412CF ASB). A used nut may not be installed.
    (2) At intervals not to exceed 100 hours TIS after accomplishing 
paragraph (e)(1) of this AD, inspect the retention nuts and CPC 
coating in accordance with paragraph (6) of the Accomplishment 
Instructions in the 412CF ASB. Reapply the CPC coating if 
deficiencies are found in the coverage and protection of the area. 
Replace any retention nut with any corrosion, mechanical damage, a 
crack, or looseness with an airworthy new nut before further flight.
    (f) 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, Rotorcraft Certification Office, 
Rotorcraft Directorate, FAA. Operators shall submit their requests 
through an FAA Principal Maintenance Inspector, who may concur or 
comment and then send it to the Manager, Rotorcraft Certification 
Office.

    Note 2: Information concerning the existence of approved 
alternative methods of compliance with this AD, if any, may be 
obtained from the Rotorcraft Certification Office.

    (g) 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 February 28, 2001.
Eric Bries,
Acting Manager, Rotorcraft Directorate, Aircraft Certification Service.
[FR Doc. 01-5658 Filed 3-7-01; 8:45 am]
BILLING CODE 4910-13-U