[Federal Register Volume 67, Number 125 (Friday, June 28, 2002)]
[Rules and Regulations]
[Pages 43526-43528]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 02-16056]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 2002-SW-07-AD; Amendment 39-12794; AD 2002-13-06]
RIN 2120-AA64


Airworthiness Directives; Eurocopter Deutschland GmbH (ECD) Model 
BO-105A, BO-105C, BO-105 C-2, BO-105 CB-2, BO-105 CB-4, BO-105S, BO-105 
CS-2, BO-105 CBS-2, BO-105 CBS-4, and BO-105LS A-1 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) for 
Eurocopter Deutschland GmbH (ECD) (Eurocopter) Model BO-105A, BO-105C, 
BO-105 C-2, BO-105 CB-2, BO-105 CB-4, BO-105S, BO-105 CS-2, BO-105 CBS-
2, BO-105 CBS-4, and BO-105LS A-1 helicopters. This action requires 
creating a component log card or equivalent record and determining the 
calendar age, number of flights, and flight hours time-in-service (TIS) 
on two part-numbered tension-torsion (T-T) straps; inspecting and 
replacing certain T-T straps, as necessary; and modifying certain main 
rotor heads if alternate T-T straps are installed. This action also 
establishes an additional life limit for these two part-numbered T-T 
straps. This amendment is prompted by an accident in which a main rotor 
blade separated from a Eurocopter Model MBB-BK 117 helicopter due to 
fatigue failure of a T-T strap. The same part-numbered T-T strap is 
used on Eurocopter Model BO-105 helicopters. That accident indicated a 
need to establish an additional life limit for certain part-numbered T-
T straps. The actions specified in this AD are intended to prevent 
fatigue failure of a T-T strap, loss of a main rotor blade, and 
subsequent loss of control of the helicopter.

DATES: Effective July 15, 2002.
    The incorporation by reference of certain publications listed in 
the regulations is approved by the Director

[[Page 43527]]

of the Federal Register as of July 15, 2002.
    Comments for inclusion in the Rules Docket must be received on or 
before August 27, 2002.

ADDRESSES: Submit comments in triplicate to the Federal Aviation 
Administration (FAA), Office of the Regional Counsel, Southwest Region, 
Attention: Rules Docket No. 2002-SW-07-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].
    The service information referenced in this AD may be obtained from 
American Eurocopter Corporation, 2701 Forum Drive, Grand Prairie, Texas 
75053-4005, telephone (972) 641-3460, fax (972) 641-3527. This 
information may be examined 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.

FOR FURTHER INFORMATION CONTACT: Richard Monschke, Aviation Safety 
Engineer, FAA, Rotorcraft Directorate, Rotorcraft Standards Staff, Fort 
Worth, Texas 76193-0110, telephone (817) 222-5116, fax (817) 222-5961.

SUPPLEMENTARY INFORMATION: The Luftfahrt-Bundesamt (LBA), which is the 
airworthiness authority for the Federal Republic of Germany, notified 
the FAA that an unsafe condition may exist on Eurocopter Model BO-105A, 
BO-105C, BO-105 C-2, BO-105 CB-2, BO-105 CB-4, BO-105S, BO-105 CS-2, 
BO-105 CBS-2, BO-105 CBS-4, and BO-105LS A-1 helicopters. The LBA 
advises that two part-numbered T-T straps are no longer available from 
the manufacturer as spare parts, and a retrofit modification of the 
main rotor head is necessary to enable installation of alternative T-T 
straps.
    Eurocopter has issued Eurocopter Alert Service Bulletin No. ASB-BO 
105-10-115, dated June 25, 2001, which specifies determining the total 
length of installation time accumulated on the T-T straps and 
retrofitting the main rotor head, if applicable. Eurocopter has also 
issued Eurocopter Service Bulletin No. SB-BO 105-10-100, Revision 1, 
dated July 16, 2001, which specifies replacing affected main rotor head 
parts with product-improved new parts. The LBA classified these service 
bulletins as mandatory and issued AD 2001-281, effective October 18, 
2001, to ensure the continued airworthiness of these helicopters in the 
Federal Republic of Germany.
    These helicopter models are manufactured in the Federal Republic of 
Germany and are type certificated for operation in the United States 
under the provisions of 14 CFR 21.29 and the applicable bilateral 
agreement. Pursuant to the applicable bilateral agreement, the LBA has 
kept the FAA informed of the situation described above. The FAA has 
examined the findings of the LBA, reviewed all available information, 
and determined that AD action is necessary for products of these type 
designs that are certificated for operation in the United States.
    This unsafe condition is likely to exist or develop on other 
helicopters of the same type designs registered in the United States. 
Therefore, this AD is being issued to prevent fatigue failure of a T-T 
strap, loss of a main rotor blade, and subsequent loss of control of 
the helicopter. This AD requires:
     Creating a component log card or equivalent record and 
determining the calendar age, number of flights, and flight hours TIS 
on each T-T strap;
     Replacing certain part-numbered T-T straps based on new 
life limits; and
     Modifying certain main rotor heads if alternate T-T straps 
are to be installed.
    This AD also establishes additional life limits for two part-
numbered T-T straps. The main rotor head modifications must be 
accomplished in accordance with the service bulletin described 
previously. The short compliance time involved is required because the 
previously described critical unsafe condition can adversely affect the 
structural integrity and controllability of the helicopter. Therefore, 
determining the amount of accumulated time of each T-T strap, replacing 
certain part-numbered T-T straps based on the new life limit, and 
modifying certain main rotor heads are required before further flight, 
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.
    The FAA estimates that 20 helicopters will be affected by this AD, 
that it will take approximately 24 work hours to accomplish the T-T 
strap replacements and main rotor head modification, and that the 
average labor rate is $60 per work hour. Required parts will cost 
approximately $8,260 for the T-T straps and $15,650 for parts to modify 
the main rotor head for each helicopter. Based on these figures, the 
total cost impact of the AD on U.S. operators is estimated to be 
$507,000.

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 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 mailed 
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. 2002-SW-07-AD.'' The postcard will be date 
stamped and returned to the commenter.
    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.
    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

[[Page 43528]]

FR 11034, February 26, 1979). If it is determined that this emergency 
regulation otherwise would be significant under DOT Regulatory 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:

2002-13-06  Eurocopter Deutschland GMBH (ECD): Amendment 39-12794. 
Docket No. 2002-SW-07-AD.

    Applicability: Model BO-105A, BO-105C, BO-105 C-2, BO-105 CB-2, 
BO-105 CB-4, BO-105S, BO-105 CS-2, BO-105 CBS-2, BO-105 CBS-4, and 
BO-105LS A-1 helicopters, with main rotor head assembly, part number 
(P/N) 105-14101, and tension-torsion (T-T) straps, P/N 2602559 or P/
N 2606576, 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 (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 fatigue failure of a T-T strap, loss of a main rotor 
blade, and subsequent loss of control of the helicopter, accomplish 
the following:
    (a) Before further flight:
    (1) Create a component log card or equivalent record for each T-
T strap.
    (2) Review the history of each affected helicopter and each T-T 
strap. For each T-T strap, determine the number of months since 
initial installation on any helicopter (age), the number of flights, 
and the number of flight hours time-in-service (TIS). Enter the age, 
the number of flights, and the number of flight hours TIS for each 
T-T strap on the component log card or equivalent record.
    (i) If the number of flights is unknown, multiply the number of 
hours TIS by 5 and use this result as the number of flights.
    (ii) If a T-T strap has been previously used at any time on 
Model BO-105LS A-3 ``SUPER LIFTER'', BO-105 CB-5, BO-105 CBS-5, BO-
105 DBS-5, or any MBB-BK 117 series helicopter, multiply the number 
of flights accumulated on those other models by a factor of 1.6 and 
then add that result to the number of flights accumulated on the 
helicopters affected by this AD.
    (3) Remove any T-T strap from service if the total hours TIS or 
number of flights and age cannot be determined.
    (b) Before further flight, remove from service and replace with 
an airworthy T-T strap any T-T strap that has been in service 120 
months since initial installation on any helicopter, accumulated 
15,600 flights (a flight is a takeoff and a landing), or has 
accumulated 2,400 hours TIS on any helicopter.
    (c) This AD revises the Airworthiness Limitations Section of the 
maintenance manual by establishing a life limit for the T-T strap, 
P/N 2602559 and P/N 2606576, of 120 months or 15,600 flights, or 
2,400 hours TIS, whichever occurs first.

    Note 2: T-T straps, P/N 2602559 and P/N 2606576, are no longer 
in production. T-T straps, P/N 2604067 or P/N J17322-1, may be used 
as alternate replacements if necessary.

    (d) Before T-T straps, P/N 2604067 or P/N J17322-1, are 
installed, modify any main rotor head P/N 105-14101 configuration to 
a main rotor head P/N 105-141081 configuration in accordance with 
paragraph 2, Accomplishment Instructions, and Figure 1 of Eurocopter 
Service Bulletin No. SB-BO 105-10-100, Revision 1, dated July 16, 
2001.

    Note 3: AD 2001-17-08 (65 FR 52010, August 28, 2000) established 
the life limits for T-T straps, P/N 2604067 and P/N J17322-1.

    (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, Regulations Group, Rotorcraft 
Directorate. Operators shall submit their requests through an FAA 
Principal Maintenance Inspector, who may concur or comment and then 
send it to the Manager, Regulations Group.

    Note 4: Information concerning the existence of approved 
alternative methods of compliance with this AD, if any, may be 
obtained from the Regulations Group.

    (f) Special flight permits may be issued in accordance with 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 main rotor head modification shall be done in accordance 
with paragraph 2 of the Accomplishment Instructions and Figure 1 of 
Eurocopter Service Bulletin No. SB-BO 105-10-100, Revision 1, dated 
July 16, 2001. 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 51. Copies may be obtained from American Eurocopter 
Corporation, 2701 Forum Drive, Grand Prairie, Texas 75053-4005, 
telephone (972) 641-3460, fax (972) 641-3527. 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 July 15, 2002.

    Note 5: The subject of this AD is addressed in Luftfahrt-
Bundesamt (Federal Republic of Germany) AD 2001-281, effective 
October 18, 2001.


    Issued in Fort Worth, Texas, on June 18, 2002.
Eric Bries,
Acting Manager, Rotorcraft Directorate, Aircraft Certification Service.
[FR Doc. 02-16056 Filed 6-27-02; 8:45 am]
BILLING CODE 4910-13-P