Airworthiness Directives; Eurocopter Deutschland GMBH Model MBB-BK 117 Helicopters

[Federal Register Volume 66, Number 14 (Monday, January 22, 2001)]
[Rules and Regulations]
[Pages 6453-6454]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 01-1585]



[[Page 6453]]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 99-SW-67-AD; Amendment 39-12056; AD 2000-26-06]
RIN 2120-AA64


Airworthiness Directives; Eurocopter Deutschland GMBH Model MBB-
BK 117 Helicopters

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final rule.

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SUMMARY: This amendment supersedes an existing airworthiness directive 
(AD) that applies to Eurocopter Deutschland GMBH (ECD) Model MBB-BK 117 
helicopters. That AD currently requires, before further flight, 
creating a component log card or equivalent record and determining the 
calendar age and number of flights on each tension-torsion (TT) strap. 
This amendment establishes a life limit for certain main rotor TT 
straps. This amendment is prompted by an accident in which a main rotor 
blade (blade) separated from an ECD Model MBB-BK 117 helicopter due to 
fatigue failure of a TT strap. The actions specified by this AD are 
intended to prevent fatigue failure of a TT strap, loss of a blade, and 
subsequent loss of control of the helicopter.

DATES: Effective February 26, 2001.
    The incorporation by reference of certain publications listed in 
the regulations is approved by the Director of the Federal Register as 
of February 26, 2001.

ADDRESSES: 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: Charles Harrison, Aviation Safety 
Engineer, FAA, Rotorcraft Directorate, Rotorcraft Standards Staff, Fort 
Worth, Texas 76193-0110, telephone (817) 222-5128, fax (817) 222-5961.

SUPPLEMENTARY INFORMATION: A proposal to amend part 39 of the Federal 
Aviation Regulations (14 CFR part 39) by superseding AD 2000-01-11, 
Amendment 39-11509 (65 FR 2017, January 13, 2000), which applies to ECD 
Model MBB-BK 117 helicopters, was published in the Federal Register on 
September 18, 2000 (65 FR 56275). That action proposed establishing a 
life limit for the TT straps of 120 months since installation on any 
helicopter or 25,000 flights, whichever occurs first.
    Interested persons have been afforded an opportunity to participate 
in the making of this amendment. No comments were received on the 
proposal or the FAA's determination of the cost to the public. The FAA 
has determined that air safety and the public interest require the 
adoption of the rule as proposed.
    The FAA estimates that 127 helicopters of U.S. registry will be 
affected by this AD, that it will take approximately 16 work hours per 
helicopter to accomplish the required actions, and that the average 
labor rate is $60 per work hour. Required parts will cost approximately 
$10,400 per helicopter. Based on these figures, the total cost impact 
of the AD on U.S. operators is estimated to be $1,442,720.
    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 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 removing Amendment 39-11509 (65 FR 
2017, January 13, 2000), and by adding a new airworthiness directive 
(AD), Amendment 39-12056, to read as follows:

2000-26-06  Eurocopter Deutschland GMBH: Amendment 39-12056. Docket 
No. 99-SW-67-AD. Supersedes AD 2000-01-11, Amendment 39-11509, 
Docket No. 99-SW-60-AD.

    Applicability: Model MBB-BK 117 A-1, A-3, A-4, B-1, B-2, and C-1 
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 (d) 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 tension-torsion (TT) strap, loss 
of a main rotor blade (blade), and subsequent loss of control of the 
helicopter, accomplish the following:
    (a) Before further flight,
    (1) Remove TT straps, P/N 2604067 (Bendix) or J17322-1 (Lord), 
from service or re-identify them as P/N 117-14110 or 117-14111, 
respectively, in accordance with the Accomplishment Instructions, 
paragraph 2.B.1.2., Eurocopter Deutschland GMBH Alert Service 
Bulletin MBB-BK-117 No. ASB-MBB-BK 117-10-120, Revision 1, dated 
August 31, 1999 (ASB). TT straps, P/N 2604067 (Bendix) or J17322-1 
(Lord), are no longer eligible for installation.
    (2) Create a component log card or equivalent record for each TT 
strap.
    (3) Review the history of the helicopter and each TT strap. 
Determine the age since initial installation on any helicopter (age) 
and the number of flights on each TT strap. Enter both the age and 
the number of flights for each TT strap on the component log card or 
equivalent record. When the number of flights is unknown, multiply 
the number of hours time-in-service (TIS) by 5 to determine the 
number of flights.
    (4) Remove any TT strap from service if the total hours TIS or 
number of flights and age cannot be determined.
    (b) Before further flight, remove any TT strap, part number (P/
N) 117-14110 or 117-

[[Page 6454]]

14111, that has been in service 120 months since initial 
installation on any helicopter or accumulated 25,000 flights (a 
flight is a takeoff and a landing). Replace the TT strap with an 
airworthy TT strap.
    (c) This AD revises the Airworthiness Limitations Section of the 
maintenance manual by establishing a life limit for the TT strap, P/
N 117-14110 and 117-14111, of 120 months or 25,000 flights, 
whichever occurs first.
    (d) 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, FAA. 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 2: Information concerning the existence of approved 
alternative methods of compliance with this AD, if any, may be 
obtained from the Regulations Group.

    (e) Special flight permits may be issued in accordance with 
Sec. 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.
    (f) The modification shall be done in accordance with the 
Accomplishment Instructions, paragraph 2.B.1.2., Eurocopter 
Deutschland GMBH Alert Service Bulletin MBB-BK-117 No. ASB-MBB-BK 
117-10-120, Revision 1, dated August 31, 1999. 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 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.
    (g) This amendment becomes effective on February 26, 2001.

    Note 3: The subject of this AD is addressed in the Luftfahrt 
Bundesamt (Federal Republic of Germany) AD 1999-284/2, dated 
September 1, 1999.


    Issued in Fort Worth, Texas, on December 15, 2000.
Henry A. Armstrong,
Manager, Rotorcraft Directorate, Aircraft Certification Service.
[FR Doc. 01-1585 Filed 1-19-01; 8:45 am]
BILLING CODE 4910-13-U

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