AD 2000-15-21

[Federal Register Volume 65, Number 154 (Wednesday, August 9, 2000)]
[Rules and Regulations]
[Pages 48605-48606]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 00-20186]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 2000-SW-01-AD; Amendment 39-11854; AD 2000-15-21]
RIN 2120-AA64


Airworthiness Directives; Bell Helicopter Textron Inc.--
Manufactured Model HH-1K, TH-1F, TH-1L, UH-1A, UH-1B, UH-1E, UH-1F, UH-
1H, UH-1L, and UH-1P; and Southwest Florida Aviation SW204, SW204HP, 
SW205, and SW205A-1 Helicopters

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final rule.

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SUMMARY: This amendment adopts a new airworthiness directive (AD) that 
applies to Bell Helicopter Textron Inc. (BHTI)-manufactured Model HH-
1K, TH-1F, TH-1L, UH-1A, UH-1B, UH-1E, UH-1F, UH-1H, UH-1L, and UH-1P; 
and Southwest Florida Aviation SW204, SW204HP, SW205, and SW205A-1 
helicopters. This AD requires removing and replacing certain main rotor 
mast (mast) assemblies. This AD is prompted by a BHTI-manufactured 
Model UH-1B accident due to fatigue failure of a thin-wall mast 
installed on the helicopter. The actions specified by this AD are 
intended to prevent fatigue failure of the mast and subsequent loss of 
control of the helicopter.

EFFECTIVE DATE: August 24, 2000.

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: A proposal to amend part 39 of the Federal 
Aviation Regulations (14 CFR part 39) to include an AD for BHTI-
manufactured Model HH-1K, TH-1F, TH-1L, UH-1A, UH-1B, UH-1E, UH-1F, UH-
1H, UH-1L, and UH-1P; and Southwest Florida Aviation SW204, SW204HP, 
SW205, and SW205A-1 helicopters was published in the Federal Register 
on March 24, 2000 (65 FR 15882). That action proposed to require 
removing any mast assembly, part number (P/N) 204-011-450-001 or -005, 
and replacing it with an airworthy mast assembly.
    Interested persons have been afforded an opportunity to participate 
in the making of this amendment. Due consideration has been given to 
the comments received.
    One commenter states that the FAA's reference to the affected 
aircraft as ``BHTI-manufactured'' implies BHTI responsibility. The 
commenter states that BHTI never obtained an FAA type certificate for 
the affected helicopters. Although BHTI originally manufactured the 
affected helicopters for the U.S. military, they have not produced any 
helicopters of these types for 20 years. The commenter requests that we 
refer to the affected aircraft as ``FAA type certificated U.S. military 
surplus UH-1 helicopters.'' The FAA agrees that BHTI is neither the 
type certificate holder nor the production certificate holder. However, 
the FAA does not concur that the terminology ``Bell Helicopter Textron 
Inc.-manufactured'' implies BHTI responsibility. The type certificate 
holder is responsible for defining corrective actions for the aircraft 
on their type certificate (see 14 CFR 21.99). The FAA uses the 
terminology ``Bell Helicopter Textron Inc.-manufactured Model * * *'' 
only to identify the original manufacturer of the helicopter. The use 
of this terminology in no way intends to assign or imply responsibility 
to BHTI.
    The commenter also requests that the FAA type certificate holders 
or the applicable entities be specifically identified in the 
applicability section of the AD. The FAA does not agree to this request 
because the type certificate holders are already specifically 
identified by name in the paragraph immediately preceding the 
``applicability'' paragraph of the AD.
    The commenter also states that the mast pole referred to in the 
NPRM was retired by the Army years ago. Since the commenter understands 
that the Army manuals are used by the FAA in certifying the affected 
helicopters, the commenter questions why the helicopters are not 
already out of configuration. The configuration change

[[Page 48606]]

to remove these masts from installation eligibility may or may not have 
been incorporated in the Army manuals. In order to ensure correction of 
this unsafe condition, the FAA is requiring the design change by 
issuance of this AD.
    The commenter further states that BHTI does not refer to the mast 
pole as a ``thin-walled mast,'' but as the ``standard wall mast,'' and 
requests that the nomenclature be changed to identify a specific dash 
numbered mast. The FAA uses the terminology ``thin-wall masts'' because 
that wording was used by the U.S. Army in Safety of Flight Message UH-
1-84-08 dated July 1984. The terminology is being retained in the 
summary of this AD for consistency. Specific dash numbers in this AD 
are used for identifying the affected mast assemblies to be removed. 
For replacement parts, it is unnecessary to specify the specific dash 
number; it is only necessary that they be airworthy.
    The commenter also states that the term ``airworthy mast'' is 
ambiguous. The FAA does not agree. The term ``airworthy'' is standard 
aviation terminology and means a part that meets type design and is in 
a condition for safe operation.
    Finally, the commenter states that no mention of the Retirement 
Index Number (RIN) procedure of counting torque events is mentioned in 
the NPRM. The commenter states that repeated heavy lifting, such as is 
involved in logging, greatly reduces the life of the mast as well as 
other components. The FAA has imposed RIN counting requirements for any 
replacement masts in Emergency AD 2000-08-53, issued April 26, 2000. 
RIN counting procedures for the masts, P/N 204-011-450-001 and -005, 
were mandated by that Emergency AD.
    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 as proposed.
    The FAA estimates that 75 helicopters of U.S. registry will be 
affected by this AD, that it will take approximately 10 work hours per 
helicopter to accomplish the required actions, and that the average 
labor rate is $60 per work hour. Replacing a mast assembly will cost 
approximately $8,862. Based on these figures, the total cost impact of 
the AD on U.S. operators is estimated to be $709,650 to replace all the 
masts in the fleet.
    The regulations adopted herein will 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 final rule does not have federalism 
implications under Executive Order 13132.
    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 FAA, Office of the Regional Counsel, 
Southwest Region, 2601 Meacham Blvd., Room 663, Fort Worth, Texas.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, 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 a new airworthiness directive 
to read as follows:

2000-15-21  Firefly Aviation Helicopter Services (Previously 
Erickson Air Crane Co.); Garlick Helicopters, Inc.; Hawkins and 
Powers Aviation, Inc.; International Helicopters, Inc.; Tamarack 
Helicopters, Inc. (Previously Ranger Helicopter Services, Inc.); 
Robinson Air Crane, Inc.; Williams Helicopter Corporation 
(Previously Scott Paper Co.); Smith Helicopters; Southern 
Helicopter, Inc.; Southwest Florida Aviation; Arrow Falcon 
(Previously Utah State University); Western International Aviation, 
Inc.; and U.S. Helicopter, Inc.: Amendment 39-11854. Docket No. 
2000-SW-01-AD.

    Applicability: Bell Helicopter Textron Inc.-manufactured Model 
HH-1K, TH-1F, TH-1L, UH-1A, UH-1B, UH-1E, UH-1F, UH-1H, UH-1L, and 
UH-1P; and Southwest Florida Aviation SW204, SW204HP, SW205, and 
SW205A-1 helicopters with a main rotor mast (mast) assembly, part 
number (P/N) 205-011-450-001 or -005, installed, 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 (b) 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 within 25 hours time-in-service, unless 
accomplished previously.
    To prevent fatigue failure of the mast and subsequent loss of 
control of the helicopter, accomplish the following:
    (a) Remove any mast assembly, part number (P/N) 204-011-450-001 
or -005, from service. Replace with an airworthy mast assembly. 
Neither mast, P/N 204-011-450-001 nor 204-011-450-005, are eligible 
for installation on any affected helicopter.
    (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, 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.

    (c) 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.
    (d) This amendment becomes effective on August 24, 2000.

    Issued in Fort Worth, Texas, on August 1, 2000.
Henry A. Armstrong,
Manager, Rotorcraft Directorate, Aircraft Certification Service.
[FR Doc. 00-20186 Filed 8-8-00; 8:45 am]
BILLING CODE 4910-13-U