[Federal Register Volume 63, Number 53 (Thursday, March 19, 1998)]
[Rules and Regulations]
[Pages 13332-13333]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 98-6761]
[[Page 13332]]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. 97-NM-289-AD; Amendment 39-10401; AD 98-06-23]
RIN 2120-AA64
Airworthiness Directives; Saab Model SAAB 2000 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 2000 series airplanes, that
requires application of sealant to the auxiliary power unit (APU)
firezone bulkhead. This amendment is prompted by issuance of mandatory
continued airworthiness information by a foreign civil airworthiness
authority. The actions specified by this AD are intended to prevent
hazardous amounts of flame, fuel, and vapor from entering compartments
outside the fire zone due to unsealed openings in the firezone
bulkhead, which could result in a fire outside the APU firezone
compartment.
DATES: Effective April 23, 1998.
The incorporation by reference of certain publications listed in
the regulations is approved by the Director of the Federal Register as
of April 23, 1998.
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
Aviation Regulations (14 CFR part 39) to include an airworthiness
directive (AD) that is applicable to certain Saab Model SAAB 2000
series airplanes was published in the Federal Register on December 18,
1997 (62 FR 66315). That action proposed to require application of
sealant to the auxiliary power unit (APU) firezone bulkhead.
Comments
Interested persons have been afforded an opportunity to participate
in the making of this amendment. Due consideration has been given to
the single comment received.
Request To Revise Description of the Addressed Unsafe Condition
One commenter notes that the description of the addressed unsafe
condition that appeared in the proposal states, in part, `` * * * to
prevent hazardous amounts of flame, fuel, and vapor from entering the
passenger compartments * * *.'' The commenter states that there are
other compartments between the APU firezone compartments and the
passenger compartment; the actual design makes it unlikely that flames,
fuel, or vapor will enter the passenger compartment due to unsealed
openings in the firezone bulkhead. The commenter suggests that a more
accurate description of the unsafe condition would be ``* * * to
prevent hazardous amounts of flame, fuel, and vapor from entering
compartments outside the fire zone * * *. ''
The FAA concurs that the commenter's proposed wording is a more
accurate statement of the unsafe condition. The FAA has revised this
final rule accordingly.
Conclusion
After careful review of the available data, including the comment
noted above, the FAA has determined that air safety and the public
interest require the adoption of the rule with the change previously
described. The FAA has determined that this change will neither
increase the economic burden on any operator nor increase the scope of
the AD.
Cost Impact
The FAA estimates that 3 Model SAAB 2000 series 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 actions, and that
the average labor rate is $60 per work hour. Based on these figures,
the cost impact of the AD on U.S. operators is estimated to be $360, or
$120 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:
98-06-23 Saab Aircraft AB: Amendment 39-10401. Docket 97-NM-289-AD.
Applicability: Model SAAB 2000 series airplanes, serial numbers
-004 through -040 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
[[Page 13333]]
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 hazardous amounts of flame, fuel, and vapor from
entering compartments outside the fire zone due to unsealed openings
in the firezone bulkhead, which could result in an uncontrollable
fire outside the auxiliary power unit (APU) firezone compartment,
accomplish the following:
(a) Within 400 flight hours or 2 months after the effective date
of this AD, whichever occurs later, apply sealant to the APU
firezone bulkhead, in accordance with Saab Service Bulletin 2000-53-
024, dated December 2, 1996.
(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 2: Information concerning the existence of approved
alternative methods of compliance with this AD, if any, may be
obtained from the International Branch, ANM-116.
(c) 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 airplane to a location where
the requirements of this AD can be accomplished.
(d) The actions shall be done in accordance with Saab Service
Bulletin 2000-53-024, dated December 2, 1996. 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 3: The subject of this AD is addressed in Swedish
airworthiness directive SAD No. 1-105, dated December 4, 1996.
(e) This amendment becomes effective on April 23, 1998.
Issued in Renton, Washington, on March 10, 1998.
Darrell M. Pederson,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 98-6761 Filed 3-18-98; 8:45 am]
BILLING CODE 4910-13-U
