[Federal Register Volume 64, Number 211 (Tuesday, November 2, 1999)]
[Rules and Regulations]
[Pages 59113-59114]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 99-28248]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 99-NM-199-AD; Amendment 39-11395; AD 99-22-17]
RIN 2120-AA64


Airworthiness Directives; Saab Model SAAB SF340A and 340B Series 
Airplanes

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final rule.

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SUMMARY: This amendment adopts a new airworthiness directive (AD), 
applicable to certain Saab Model SAAB SF340A and 340B series airplanes, 
that requires removal of certain main landing gear downlock and brake 
hydraulic swivel brackets and replacement with new, redesigned 
brackets. This amendment is prompted by issuance of mandatory 
continuing airworthiness information by a foreign civil airworthiness 
authority. The actions specified by this AD are intended to prevent 
failure of the downlock or brake swivels. Brake swivel failure could 
cause the loss of inboard or outboard brakes. Downlock swivel failure 
could cause the loss of hydraulic fluid in the main hydraulic system, 
as well as the loss of nose wheel steering operation, extension and 
retraction capability of landing gear and flaps, and operation of the 
propeller brake (if installed).

DATES: Effective December 7, 1999.

    The incorporation by reference of certain publications listed in 
the regulations is approved by the Director of the Federal Register as 
of December 7, 1999.

ADDRESSES: The service information referenced in this AD may be 
obtained from Saab Aircraft AB, SAAB Aircraft Product Support, S-
581.88, Linkoping, Sweden. This information may be examined at the 
Federal Aviation Administration (FAA), Transport Airplane Directorate, 
Rules Docket, 1601 Lind Avenue, SW., Renton, Washington; or at the 
Office of the Federal Register, 800 North Capitol Street, NW., suite 
700, Washington, DC.

FOR FURTHER INFORMATION CONTACT: Norman B. Martenson, Manager, 
International Branch, ANM-116, FAA, Transport Airplane Directorate, 
1601 Lind Avenue, SW., Renton, Washington 98055-4056; telephone (425) 
227-2110; fax (425) 227-1149.

SUPPLEMENTARY INFORMATION: A proposal to amend part 39 of the Federal

[[Page 59114]]

Aviation Regulations (14 CFR part 39) to include an airworthiness 
directive (AD) that is applicable to certain Saab Model SAAB SF340A and 
340B series airplanes was published in the Federal Register on August 
30, 1999 (64 FR 47146). That action proposed to require removal of 
certain main landing gear downlock and brake hydraulic swivel brackets 
and replacement with new, redesigned brackets.

Comments

    Interested persons have been afforded an opportunity to participate 
in the making of this amendment. No comments were submitted in response 
to the proposal or the FAA's determination of the cost to the public.

Conclusion

    The FAA has determined that air safety and the public interest 
require the adoption of the rule as proposed.

Cost Impact

    The FAA estimates that 200 airplanes of U.S. registry will be 
affected by this AD, that it will take approximately 2 work hours per 
airplane to accomplish the required replacement, and that the average 
labor rate is $60 per work hour. Required parts will cost approximately 
$1,375 per airplane. Based on these figures, the cost impact of this AD 
on U.S. operators is estimated to be $299,000, or $1,495 per airplane.
    The cost impact figure discussed above is based on assumptions that 
no operator has yet accomplished any of the requirements of this AD 
action, and that no operator would accomplish those actions in the 
future if this AD were not adopted.

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.
    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 adding the following new 
airworthiness directive:
    99-22-17 Saab Aircraft AB: Amendment 39-11395. Docket 99-NM-199-
AD.

    Applicability: Model SAAB SF340A series airplanes, serial 
numbers SF340A-004 through -159 inclusive, and Model SAAB 340B 
series airplanes, serial numbers SF340B-160 through -339 inclusive; 
certificated in any category.
    Note 1: This AD applies to each airplane 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 airplanes 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 as indicated, unless accomplished 
previously.
    To prevent failure of the main landing gear (MLG) downlock or 
brake hydraulic swivels and consequent loss of certain hyraulic-
fypowered operations, accomplish the following:

Bracket Replacement

    (a) Within 12 months after the effective date of this AD, remove 
the MLG downlock and brake hydraulic swivel brackets and replace 
with new, improved parts, in accordance with Saab Service Bulletin 
340-29-009, Revision 02, dated July 2, 1999.
    Note 2: Accomplishment, prior to the effective date of this AD, 
of the bracket replacement in accordance with Saab Service Bulletin 
340-29-009, dated August 20, 1992, or Revision 1, dated April 15, 
1993, is considered acceptable for compliance with the requirements 
of paragraph (a) of this AD.

Alternative Methods of Compliance

    (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, International Branch, ANM-116, FAA, 
Transport Airplane Directorate. Operators shall submit their 
requests through an appropriate FAA Principal Maintenance Inspector, 
who may add comments and then send it to the Manager, International 
Branch, ANM-116.

    Note 3: Information concerning the existence of approved 
alternative methods of compliance with this AD, if any, may be 
obtained from the Manager, International Branch, ANM-116.

Special Flight Permits

    (c) Special flight permits may be issued in accordance with 
Secs. 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 
21.197 and 21.199) to operate the airplane to a location where the 
requirements of this AD can be accomplished.

Incorporation by Reference

    (d) The replacement shall be done in accordance with Saab 
Service Bulletin 340-29-009, Revision 02, dated July 2, 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 Saab Aircraft AB, SAAB Aircraft 
Product Support, S-581.88, Linkoping, Sweden. Copies may be 
inspected at the FAA, Transport Airplane Directorate, 1601 Lind 
Avenue, SW., Renton, Washington; or at the Office of the Federal 
Register, 800 North Capitol Street, NW., suite 700, Washington, DC.

    Note 4: The subject of this AD is addressed in Swedish 
airworthiness directive SAD No. 1-145, dated July 2, 1999.

    (e) This amendment becomes effective on December 7, 1999.

    Issued in Renton, Washington, on October 22, 1999.
D.L. Riggin,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 99-28248 Filed 11-1-99; 8:45 am]
BILLING CODE 4910-13-U