AD Amdt-39-10099

[Federal Register Volume 62, Number 161 (Wednesday, August 20, 1997)]
[Rules and Regulations]
[Pages 44206-44207]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 97-21791]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 96-NM-167-AD; Amendment 39-10099; AD 97-16-07]
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 replacement of the existing fire, tailpipe, and bleed-air 
overheat detector control units with new, improved units. This 
amendment is prompted by reports indicating that false engine and 
auxiliary power unit (APU) fire warnings were issued from the fire 
detector control units due to moisture or induced voltages of the 
detector control unit. The actions specified by this AD are intended to 
prevent such false fire warnings, which could result in unnecessary 
diversion of the airplane, and resultant increased risks to the 
airplane, passengers, and crew, and the potential for an overweight 
landing.

DATES: Effective September 24, 1997.
    The incorporation by reference of certain publications listed in 
the regulations is approved by the Director of the Federal Register as 
of September 24, 1997.

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: Ruth Harder, Aerospace Engineer, 
Standardization Branch, ANM-113, FAA, Transport Airplane Directorate, 
1601 Lind Avenue, SW., Renton, Washington 98055-4056; telephone (425) 
227-1721; 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 May 1, 1997 
(62 FR 23695). That action proposed to require replacement of the 
existing fire, tailpipe, and bleed leak detector control units with 
new, improved units.
    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.

Revised Service Bulletin Citation

    The final rule has been revised to clarify that Saab Service 
Bulletin 2000-26-002, which was cited in the proposal as the 
appropriate source of service information, includes Attachments 1 and 
2. These attachments specify procedures from the Aircraft Maintenance 
Manual for removal and installation of the bleed-air overheat detection 
system control unit.

Conclusion

    After careful review of the available data, the FAA has determined 
that air safety and the public interest require the

[[Page 44207]]

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 2 Saab Model SAAB 2000 series airplanes of 
U.S. registry will be affected by this AD, that it will take 
approximately 3 work hours per airplane to accomplish the required 
actions, and that the average labor rate is $60 per work hour. Required 
parts will be provided by the manufacturer at no cost to the operators. 
Based on these figures, the cost impact of the AD on U.S. operators is 
estimated to be $360, or $180 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:

97-16-07  Saab Aircraft AB: Amendment 39-10099. Docket 96-NM-167-AD.

    Applicability: Model SAAB 2000 series airplanes having serial 
numbers 005 through 029 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 
otherwise 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 (c) 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 false fire warning inputs of the engines and 
auxiliary power unit (APU), which could result in unnecessary 
diversion of the airplane, resultant increased risks to the 
airplane, passengers, and crew, and the potential for an overweight 
landing; ccomplish the following:
    (a) Within 4 months after the effective date of this AD, replace 
the existing fire (engine/APU), tailpipe, and bleed-air overheat 
detector control units with new, improved control units, in 
accordance with Saab Service Bulletin 2000-26-002, dated May 9, 
1995, including Attachments 1 and 2.
    (b) As of the effective date of this AD, no person shall install 
a fire, tailpipe, or bleed-air detector control unit having part 
number 25000020-21, 25000021-31, or 25000020-11 on any airplane.
    (c) 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, Standardization Branch, ANM-113, 
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, 
Standardization Branch, ANM-113.

    Note 2: Information concerning the existence of approved 
alternative methods of compliance with this AD, if any, may be 
obtained from the Standardization Branch, ANM-113.

    (d) 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.
    (e) The replacement shall be done in accordance with Saab 
Service Bulletin 2000-26-002, dated May 9, 1995, including 
Attachments 1 and 2, which includes the following list of effective 
pages:

------------------------------------------------------------------------
                                   Revision level                       
            Page No.                shown on page     Date shown on page
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1-6............................  Original..........  May 9, 1995.       
                                 Attachment 1                           
1-3............................  Original..........  Not Dated.         
                                 Attachment 2                           
1-3............................  Original..........  Not Dated.         
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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.
    (f) This amendment becomes effective on September 24, 1997.

    Issued in Renton, Washington, on July 29, 1997.
Darrell M. Pederson,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 97-21791 Filed 8-19-97; 8:45 am]
BILLING CODE 4910-13-U