
[Federal Register: April 29, 2010 (Volume 75, Number 82)]
[Rules and Regulations]               
[Page 22517-22518]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr29ap10-7]                         


[[Page 22517]]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2010-0123 Directorate Identifier 2010-CE-004-AD; 
Amendment 39-16267; AD 2010-09-02]
RIN 2120-AA64

 
Airworthiness Directives; British Aerospace Regional Aircraft 
Model Jetstream Series 3101 and Jetstream Model 3201 Airplanes

AGENCY: Federal Aviation Administration (FAA), Department of 
Transportation (DOT).

ACTION: Final rule.

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SUMMARY: We are adopting a new airworthiness directive (AD) for the 
products listed above. This AD results from mandatory continuing 
airworthiness information (MCAI) issued by an aviation authority of 
another country to identify and correct an unsafe condition on an 
aviation product. The MCAI describes the unsafe condition as:

    BAE Systems have received three reports of uncommanded flap 
extensions affecting different Jetstream 31 aeroplanes. In one 
instance, the aeroplane exceeded the airspeed limit allowed for the 
uncommanded flap configuration, resulting in damage to the wing 
trailing edge.
    Following investigation, it was considered that a loss of 
electrical signal to the `up' solenoid of the flap selector valve 
had occurred and, combined with the normal internal leakage in the 
hydraulic system, resulted in hydraulic pressure being supplied to 
the `down' side of the flap hydraulic jack. The loss of signal could 
have been intermittent, and the evidence strongly implicated oxide 
debris contamination of the flap selector switch contacts.
    This condition, if not corrected, could lead to further cases of 
damage to the aeroplane due to airspeed limit exceedance, possibly 
resulting in asymmetric flap deployment, which could lead to loss of 
control of the aeroplane.

We are issuing this AD to require actions to correct the unsafe 
condition on these products.

DATES: This AD becomes effective June 3, 2010.
    On June 3, 2010, the Director of the Federal Register approved the 
incorporation by reference of certain publications listed in this AD.

ADDRESSES: You may examine the AD docket on the Internet at http://
www.regulations.gov or in person at Document Management Facility, U.S. 
Department of Transportation, Docket Operations, M-30, West Building 
Ground Floor, Room W12-140, 1200 New Jersey Avenue, SE., Washington, DC 
20590.

FOR FURTHER INFORMATION CONTACT: Taylor Martin, Aerospace Engineer, 
FAA, Small Airplane Directorate, 901 Locust, Room 301, Kansas City, 
Missouri 64106; telephone: (816) 329-4138; fax: (816) 329-4090.

SUPPLEMENTARY INFORMATION:

Discussion

    We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR 
part 39 to include an AD that would apply to the specified products. 
That NPRM was published in the Federal Register on February 19, 2010 
(75 FR 7405). That NPRM proposed to correct an unsafe condition for the 
specified products. The MCAI states:

    BAE Systems have received three reports of uncommanded flap 
extensions affecting different Jetstream 31 aeroplanes. In one 
instance, the aeroplane exceeded the airspeed limit allowed for the 
uncommanded flap configuration, resulting in damage to the wing 
trailing edge.
    Following investigation, it was considered that a loss of 
electrical signal to the `up' solenoid of the flap selector valve 
had occurred and, combined with the normal internal leakage in the 
hydraulic system, resulted in hydraulic pressure being supplied to 
the `down' side of the flap hydraulic jack. The loss of signal could 
have been intermittent, and the evidence strongly implicated oxide 
debris contamination of the flap selector switch contacts.
    This condition, if not corrected, could lead to further cases of 
damage to the aeroplane due to airspeed limit exceedance, possibly 
resulting in asymmetric flap deployment, which could lead to loss of 
control of the aeroplane.
    To address this unsafe condition, BAE Systems have developed a 
modification for the wiring to the flap selector switch, connecting 
a different (unused) pair of contacts to provide a duplicated signal 
path within the switch.
    For the reasons described above, this AD requires the 
modification of the flap selector switch wiring.

Comments

    We gave the public the opportunity to participate in developing 
this AD. We received no comments on the NPRM or on the determination of 
the cost to the public.

Conclusion

    We reviewed the available data and determined that air safety and 
the public interest require adopting the AD as proposed.

Differences Between This AD and the MCAI or Service Information

    We have reviewed the MCAI and related service information and, in 
general, agree with their substance. But we might have found it 
necessary to use different words from those in the MCAI to ensure the 
AD is clear for U.S. operators and is enforceable. In making these 
changes, we do not intend to differ substantively from the information 
provided in the MCAI and related service information.
    We might also have required different actions in this AD from those 
in the MCAI in order to follow FAA policies. Any such differences are 
highlighted in a Note within the AD.

Costs of Compliance

    We estimate that this AD will affect 190 products of U.S. registry. 
We also estimate that it will take about 5 work-hours per product to 
comply with the basic requirements of this AD. The average labor rate 
is $85 per work-hour. Required parts will cost about $50 per product.
    Based on these figures, we estimate the cost of this AD to the U.S. 
operators to be $90,250 or $475 per product.

Authority for This Rulemaking

    Title 49 of the United States Code specifies the FAA's authority to 
issue rules on aviation safety. Subtitle I, section 106, describes the 
authority of the FAA Administrator. ``Subtitle VII: Aviation 
Programs,'' describes in more detail the scope of the Agency's 
authority.
    We are issuing this rulemaking under the authority described in 
``Subtitle VII, Part A, Subpart III, Section 44701: General 
requirements.'' Under that section, Congress charges the FAA with 
promoting safe flight of civil aircraft in air commerce by prescribing 
regulations for practices, methods, and procedures the Administrator 
finds necessary for safety in air commerce. This regulation is within 
the scope of that authority because it addresses an unsafe condition 
that is likely to exist or develop on products identified in this 
rulemaking action.

Regulatory Findings

    We determined that this AD will not have federalism implications 
under Executive Order 13132. This AD 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.
    For the reasons discussed above, I certify this AD:
    (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

[[Page 22518]]

    (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.
    We prepared a regulatory evaluation of the estimated costs to 
comply with this AD and placed it in the AD Docket.

Examining the AD Docket

    You may examine the AD docket on the Internet at http://
www.regulations.gov; or in person at the Docket Management Facility 
between 9 a.m. and 5 p.m., Monday through Friday, except Federal 
holidays. The AD docket contains the NPRM, the regulatory evaluation, 
any comments received, and other information. The street address for 
the Docket Office (telephone (800) 647-5527) is in the ADDRESSES 
section. Comments will be available in the AD docket shortly after 
receipt.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

Adoption of the Amendment

0
Accordingly, under the authority delegated to me by the Administrator, 
the FAA amends 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

0
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]

0
2. The FAA amends Sec.  39.13 by adding the following new AD:

2010-09-02 British Aerospace Regional Aircraft: Amendment 39-16267; 
Docket No. FAA-2010-0123; Directorate Identifier 2010-CE-004-AD.

Effective Date

    (a) This airworthiness directive (AD) becomes effective June 3, 
2010.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to Jetstream Series 3101 and Jetstream Model 
3201 airplanes, all serial numbers, certificated in any category.

Subject

    (d) Air Transport Association of America (ATA) Code 27: Flight 
Controls.

Reason

    (e) The mandatory continuing airworthiness information (MCAI) 
states:
    BAE Systems have received three reports of uncommanded flap 
extensions affecting different Jetstream 31 aeroplanes. In one 
instance, the aeroplane exceeded the airspeed limit allowed for the 
uncommanded flap configuration, resulting in damage to the wing 
trailing edge.
    Following investigation, it was considered that a loss of 
electrical signal to the ``up'' solenoid of the flap selector valve 
had occurred and, combined with the normal internal leakage in the 
hydraulic system, resulted in hydraulic pressure being supplied to 
the ``down'' side of the flap hydraulic jack. The loss of signal 
could have been intermittent, and the evidence strongly implicated 
oxide debris contamination of the flap selector switch contacts.
    This condition, if not corrected, could lead to further cases of 
damage to the aeroplane due to airspeed limit exceedance, possibly 
resulting in asymmetric flap deployment, which could lead to loss of 
control of the aeroplane.
    To address this unsafe condition, BAE Systems have developed a 
modification for the wiring to the flap selector switch, connecting 
a different (unused) pair of contacts to provide a duplicated signal 
path within the switch.
    For the reasons described above, this AD requires the 
modification of the flap selector switch wiring.

Actions and Compliance

    (f) Unless already done, within 6 months after June 3, 2010 (the 
effective date of this AD), install modification JM7861, 
Introduction of a Wire Link to Flap Selector Switch, following the 
accomplishment instructions of BAE Systems British Aerospace 
Jetstream Series 3100 & 3200 Service Bulletin 27-JM7861, dated 
February 12, 2008.

FAA AD Differences

    Note: This AD differs from the MCAI and/or service information 
as follows: No differences.

Other FAA AD Provisions

    (g) The following provisions also apply to this AD:
    (1) Alternative Methods of Compliance (AMOCs): The Manager, 
Standards Office, FAA, has the authority to approve AMOCs for this 
AD, if requested using the procedures found in 14 CFR 39.19. Send 
information to ATTN: Taylor Martin, Aerospace Engineer, FAA, Small 
Airplane Directorate, 901 Locust, Room 301, Kansas City, Missouri 
64106; telephone: (816) 329-4138; fax: (816) 329-4090. Before using 
any approved AMOC on any airplane to which the AMOC applies, notify 
your appropriate principal inspector (PI) in the FAA Flight 
Standards District Office (FSDO), or lacking a PI, your local FSDO.
    (2) Airworthy Product: For any requirement in this AD to obtain 
corrective actions from a manufacturer or other source, use these 
actions if they are FAA-approved. Corrective actions are considered 
FAA-approved if they are approved by the State of Design Authority 
(or their delegated agent). You are required to assure the product 
is airworthy before it is returned to service.
    (3) Reporting Requirements: For any reporting requirement in 
this AD, under the provisions of the Paperwork Reduction Act (44 
U.S.C. 3501 et seq.), the Office of Management and Budget (OMB) has 
approved the information collection requirements and has assigned 
OMB Control Number 2120-0056.

Related Information

    (h) Refer to MCAI European Aviation Safety Agency AD No.: 2009-
0267, dated December 17, 2009; and BAE Systems British Aerospace 
Jetstream Series 3100 & 3200 Service Bulletin 27-JM7861, dated 
February 12, 2008, for related information.

Material Incorporated by Reference

    (i) You must use BAE Systems British Aerospace Jetstream Series 
3100 & 3200 Service Bulletin 27-JM7861, dated February 12, 2008, to 
do the actions required by this AD, unless the AD specifies 
otherwise.
    (1) The Director of the Federal Register approved the 
incorporation by reference of this service information under 5 
U.S.C. 552(a) and 1 CFR part 51.
    (2) For service information identified in this AD, contact BAE 
Systems (Operations) Ltd, Customer Information Department, Prestwick 
International Airport, Ayrshire, KA9 2RW, Scotland, United Kingdom; 
telephone +44 1292 675207, fax: +44 1292 675704; E-mail: 
RApublications@baesystems.com.
    (3) You may review copies of the service information 
incorporated by reference for this AD at the FAA, Central Region, 
Office of the Regional Counsel, 901 Locust, Kansas City, Missouri 
64106. For information on the availability of this material at the 
Central Region, call (816) 329-3768.
    (4) You may also review copies of the service information 
incorporated by reference for this AD at the National Archives and 
Records Administration (NARA). For information on the availability 
of this material at NARA, call (202) 741-6030, or go to: http://
www.archives.gov/federal_register/code_of_federal_regulations/
ibr_locations.html.

    Issued in Kansas City, Missouri, on April 12, 2010.
John R. Colomy,
Acting Manager, Small Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2010-9093 Filed 4-28-10; 8:45 am]
BILLING CODE 4910-13-P

