[Federal Register Volume 64, Number 213 (Thursday, November 4, 1999)]
[Rules and Regulations]
[Pages 60102-60104]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 99-28652]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. 98-SW-50-AD; Amendment 39-11399; AD 99-23-03]
RIN 2120-AA64
Airworthiness Directives; Bell Helicopter Textron Canada Model
430 Helicopters
AGENCY: Federal Aviation Administration, DOT.
ACTION: Final rule; request for comments.
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SUMMARY: This amendment adopts a new airworthiness directive (AD) that
is applicable to Bell Helicopter Textron Canada (BHTC) Model 430
helicopters. This action requires verifying the torque on each vertical
fin attachment bolt (bolt); modifying the vertical fin and tailboom and
replacing the attachment hardware; and re-verifying the torque on the
bolts after inspecting the fittings. This amendment is prompted by a
report of a loose vertical fin, which was discovered during a post-
flight inspection. The actions specified in this AD are intended to
prevent loss of torque of the bolts, which could lead to fracture of
the bolts, separation of the vertical fin from the helicopter, and
subsequent loss of control of the helicopter.
DATES: Effective November 19, 1999.
The incorporation by reference of certain publications listed in
the regulations is approved by the Director of the Federal Register as
of November 19, 1999.
Comments for inclusion in the Rules Docket must be received on or
before January 3, 2000.
[[Page 60103]]
ADDRESSES: Submit comments in triplicate to the Federal Aviation
Administration (FAA), Office of the Regional Counsel, Southwest Region,
Attention: Rules Docket No. 98-SW-50-AD, 2601 Meacham Blvd., Room 663,
Fort Worth, Texas 76137.
The service information referenced in this AD may be obtained from
Bell Helicopter Textron Canada, 12,800 Rue de l'Avenir, Mirabel, Quebec
JON1LO, telephone (800) 463-3036, fax (514) 433-0272. This information
may be examined at the FAA, Office of the Regional Counsel, Southwest
Region, 2601 Meacham Blvd., Room 663, Fort Worth, Texas 76137; or at
the Office of the Federal Register, 800 North Capitol Street, NW.,
suite 700, Washington, DC.
FOR FURTHER INFORMATION CONTACT: Sharon Miles, Aerospace Engineer,
Rotorcraft Standards Staff, Rotorcraft Directorate, FAA, 2601 Meacham
Blvd., Fort Worth, Texas 76137, telephone (817) 222-5122, fax (817)
222-5961.
SUPPLEMENTARY INFORMATION: Transport Canada, which is the airworthiness
authority for Canada, has notified the FAA that an unsafe condition may
exist on BHTC Model 430 helicopters. Transport Canada advises that, in
one instance, loss of torque on the bolts resulted in fracture of four
of the eight bolts and a loose vertical fin on a Model 230 helicopter
which is of similar design to the Model 430 series helicopters.
BHTC has issued Bell Helicopter Textron Alert Service Bulletin No.
430-98-5, dated June 12, 1998 (ASB), which specifies a bolt torque
check within 25 hours after receipt of the ASB; removal, inspection,
and installation of the tailboom and vertical fin modification with
attaching hardware replacement at the next scheduled 150-hour
inspection after receipt of the ASB; and verifying the bolt torque
within 5 to 10 hours after each fin removal and installation, and at
every 150 hours of operation. Transport Canada classified this ASB as
mandatory and issued AD CF-98-23, dated August 7, 1998, in order to
assure the continued airworthiness of these helicopters in Canada.
This helicopter model is manufactured in Canada and is type
certificated for operation in the United States under the provisions of
section 21.29 of the Federal Aviation Regulations (14 CFR 21.29) and
the applicable bilateral airworthiness agreement. Pursuant to this
bilateral airworthiness agreement, Transport Canada has kept the FAA
informed of the situation described above. The FAA has examined the
findings of Transport Canada, reviewed all available information, and
determined that AD action is necessary for products of this type design
that are certificated for operation in the United States.
Since an unsafe condition has been identified that is likely to
exist or develop on other BHTC Model 430 helicopters of the same type
design registered in the United States, this AD is being issued to
prevent loss of torque of the bolts, which could lead to fracture of
the bolts, separation of the vertical fin from the helicopter, and
subsequent loss of control of the helicopter. This AD requires
verifying the bolt torque within 25 hours time-in-service (TIS);
modifying the vertical fin and tailboom fittings and replacing the
attachment hardware at or before the next 150-hour TIS inspection; and
re-verifying the torque on the bolts within 10 hours TIS after
inspecting the vertical fin. The actions are required to be
accomplished in accordance with the bulletin described previously. The
short compliance time involved is required because the previously
described critical unsafe condition can adversely affect the structural
integrity of the helicopter. Therefore, verifying the torque is
required within 25 hours time-in-service (TIS), and this AD must be
issued immediately.
Since a situation exists that requires the immediate adoption of
this regulation, it is found that notice and opportunity for prior
public comment hereon are impracticable, and that good cause exists for
making this amendment effective in less than 30 days.
Cost Impact
The FAA estimates that 14 helicopters will be affected by this AD,
that it will take approximately 3 work hours to accomplish the initial
torque verifications and vertical fin inspection, 12 work hours to
modify the vertical fin and install the attachment hardware, 1 work
hour to accomplish the repetitive torque verification after the
modification, and 1 work hour to accomplish each 150-hour inspection,
and that the average labor rate is $60 per work hour. Required parts
will cost approximately $1,692 if the CA430-98-5-2 kit is used or
$2,399 if the CA430-98-05-1 kit is used. Based on these figures, the
total cost impact of the AD on U.S. operators is estimated to be
$47,866, assuming only the CA430-98-05-1 kit is installed and one
repetitive 150-hour inspection on each helicopter.
Comments Invited
Although this action is in the form of a final rule that involves
requirements affecting flight safety and, thus, was not preceded by
notice and an opportunity for public comment, comments are invited on
this rule. Interested persons are invited to comment on this 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 under the caption ADDRESSES. All
communications received on or before the closing date for comments will
be considered, and this rule may be amended in light of the comments
received. Factual information that supports the commenter's ideas and
suggestions is extremely helpful in evaluating the effectiveness of the
AD action and determining whether additional rulemaking action would be
needed.
Comments are specifically invited on the overall regulatory,
economic, environmental, and energy aspects of the rule that might
suggest a need to modify the 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 that
summarizes each FAA-public contact concerned with the substance of this
AD will be filed in the Rules Docket.
Commenters wishing the FAA to acknowledge receipt of their comments
submitted in response to this rule must submit a self-addressed,
stamped postcard on which the following statement is made: ``Comments
to Docket No. 98-SW-50-AD.'' The postcard will be date stamped and
returned to the commenter.
Regulatory Impact
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.
The FAA has determined that this regulation is an emergency
regulation that must be issued immediately to correct an unsafe
condition in aircraft, and that it is not a ``significant regulatory
action'' under Executive Order 12866. It has been determined further
that this action involves an emergency regulation under DOT Regulatory
Policies and Procedures (44 FR 11034, February 26, 1979). If it is
determined that this emergency regulation otherwise would be
significant under DOT Regulatory
[[Page 60104]]
Policies and Procedures, a final regulatory evaluation will be prepared
and placed in the Rules Docket. A copy of it, if filed, 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. 106(g), 40113, 44701.
Sec. 39.13 [Amended]
2. Section 39.13 is amended by adding a new airworthiness directive
to read as follows:
AD 99-23-03 Bell Helicopter Textron Canada: Amendment 39-11399.
Docket No. 98-SW-50-AD.
Applicability: Model 430 helicopters, serial numbers 49001
through 49036, 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 request approval for an
alternative method of compliance in accordance with paragraph (e) 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 loss of torque of the vertical fin attachment bolts
(bolts), which could lead to fracture of the bolts, separation of
the vertical fin from the helicopter, and subsequent loss of control
of the helicopter accomplish the following:
(a) Within 25 hours time-in-service (TIS), verify the torque on
the bolts in accordance with Part I of the Accomplishment
Instructions in Bell Helicopter Textron Alert Service Bulletin No.
430-98-5, dated June 12, 1998 (ASB).
(b) On or before the next scheduled 150-hour TIS inspection,
modify the tailboom and vertical fin and replace the attachment
hardware in accordance with Part II of the Accomplishment
Instructions in the ASB.
(c) After accomplishing the modification required by paragraph
(b) and after at least 5 hours TIS but within 10 hours TIS, verify
the torque on the bolts in accordance with Part III of the
Accomplishment Instructions in the ASB.
(d) Thereafter, at intervals not to exceed 150 hours TIS, verify
the torque of the vertical fin attachment bolts in accordance with
the 150 flight hour scheduled inspections, Part III, of the
Accomplishment Instructions in the ASB.
(e) 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 Standards Staff,
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 Standards Staff.
Note 2: Information concerning the existence of approved
alternative methods of compliance with this AD, if any, may be
obtained from the Rotorcraft Standards Staff.
(f) 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.
(g) The inspections shall be done in accordance with Bell
Helicopter Textron Canada Alert Service Bulletin No. 430-98-5, dated
June 12, 1998.
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 Bell Helicopter Textron Canada,
12,800 Rue de l'Avenir, Mirabel, Quebec JON1LO, telephone (800) 463-
3036, fax (514) 433-0272. Copies may be inspected at the FAA, Office
of the Regional Counsel, Southwest Region, 2601 Meacham Blvd., Room
663, Fort Worth, Texas; or at the Office of the Federal Register,
800 North Capitol Street, NW., suite 700, Washington, DC.
(h) This amendment becomes effective on November 19, 1999.
Note 3: The subject of this AD is addressed in Transport Canada
(Canada) AD CF-98-23, dated August 7, 1998.
Issued in Fort Worth, Texas, on October 26, 1999.
Eric Bries,
Acting Manager, Rotorcraft Directorate, Aircraft Certification Service.
[FR Doc. 99-28652 Filed 11-3-99; 8:45 am]
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