[Federal Register Volume 62, Number 121 (Tuesday, June 24, 1997)]
[Proposed Rules]
[Pages 34024-34026]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 97-16407]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 96-NM-220-AD]
RIN 2120-AA64


Airworthiness Directives; Saab Model SAAB 2000 Series Airplanes

AGENCY: Federal Aviation Administration, DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: This document proposes the adoption of a new airworthiness 
directive (AD) that is applicable to certain Saab Model SAAB 2000 
series airplanes. This proposal would require a one-time inspection of 
the hydraulic tubes and electrical harness wires of the wing rear 
access door for chafing, leakage, or wear damage; repair of any 
discrepancy found; and modification of the wing rear access door. This 
proposal is prompted by reports of interference between the wing rear 
access door and the hydraulic tubes and electrical harnesses, and 
chafing damage to the hydraulic tubes. The actions specified by the 
proposed AD are intended to prevent such interference or chafing 
damage, which could lead to failure of the number 2 hydraulic system or 
loss of certain electrical and landing systems, and resultant reduced 
controllability of the airplane.

DATES: Comments must be received by August 4, 1997.

ADDRESSES: Submit comments in triplicate to the Federal Aviation 
Administration (FAA), Transport Airplane Directorate, ANM-103, 
Attention: Rules Docket No. 96-NM-220-AD, 1601 Lind Avenue, SW., 
Renton, Washington 98055-4056. Comments may be inspected at this 
location between 9:00 a.m. and 3:00 p.m., Monday through Friday, except 
Federal holidays.
    The service information referenced in the proposed rule may be 
obtained from SAAB Aircraft AB, SAAB Aircraft Product Support, S-
581.88, Linkoping, Sweden.
    This information may be examined at the FAA, Transport Airplane 
Directorate, 1601 Lind Avenue, SW., Renton, Washington.

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.

[[Page 34025]]

SUPPLEMENTARY INFORMATION:

Comments Invited

    Interested persons are invited to participate in the making of the 
proposed rule by submitting such written data, views, or arguments as 
they may desire. Communications shall identify the Rules Docket number 
and be submitted in triplicate to the address specified above. All 
communications received on or before the closing date for comments, 
specified above, will be considered before taking action on the 
proposed rule. The proposals contained in this notice may be changed in 
light of the comments received.
    Comments are specifically invited on the overall regulatory, 
economic, environmental, and energy aspects of the proposed rule. All 
comments submitted will be available, both before and after the closing 
date for comments, in the Rules Docket for examination by interested 
persons. A report summarizing each FAA-public contact concerned with 
the substance of this proposal will be filed in the Rules Docket.
    Commenters wishing the FAA to acknowledge receipt of their comments 
submitted in response to this notice must submit a self-addressed, 
stamped postcard on which the following statement is made: ``Comments 
to Docket Number 96-NM-220-AD.'' The postcard will be date stamped and 
returned to the commenter.

Availability of NPRMs

    Any person may obtain a copy of this NPRM by submitting a request 
to the FAA, Transport Airplane Directorate, ANM-103, Attention: Rules 
Docket No. 96-NM-220-AD, 1601 Lind Avenue, SW., Renton, Washington 
98055-4056.

Discussion

    The Luftfartsverket (LFV), which is the airworthiness authority for 
Sweden, notified the FAA that an unsafe condition may exist on certain 
Saab Model SAAB 2000 series airplanes. The LFV advises of several 
reports of interference between the wing rear access door and the 
hydraulic tubes and electrical harnesses, and one report of chafing 
damage to the hydraulic tubes on one airplane. The following 
conditions, if not corrected, could result in reduced controllability 
of the airplane:
    1. Damage to the hydraulic tubes, which could cause hydraulic fluid 
leakage and the consequent failure of the number 2 hydraulic system 
that supplies hydraulic pressure to certain airplane flight control and 
landing systems.
    2. Damage to the electrical harnesses, which could lead to the 
failure of certain electrical systems, including those used for aileron 
trim control and engine starting capability.

Explanation of Relevant Service Information

    Saab has issued Service Bulletin 2000-53-010, Revision 01, dated 
October 10, 1995, which describes procedures for a one-time visual 
inspection of the hydraulic tubes and electrical harness wires of the 
wing rear access door for chafing, leakage, or wear damage; and repair 
of any discrepancy found. The service bulletin also describes 
procedures for modification of the wing rear access door, which 
includes the application of silicon tape to the electrical harnesses. 
Accomplishment of the modification will prevent interference between 
the wing rear access door and the hydraulic tubes and electrical 
harnesses.
    The LFV classified this service bulletin as mandatory and issued 
Swedish airworthiness directive (SAD) 1-077R2, dated June 9, 1997, in 
order to assure the continued airworthiness of these airplanes in 
Sweden.

FAA's Conclusions

    This airplane model is manufactured in Sweden and is type 
certificated for operation in the United States under the provisions of 
section 21.29 of the Federal Aviation Regulations (14 CFR 21.29) and 
the applicable bilateral airworthiness agreement. Pursuant to this 
bilateral airworthiness agreement, the LFV has kept the FAA informed of 
the situation described above. The FAA has examined the findings of the 
LFV, reviewed all available information, and determined that AD action 
is necessary for products of this type design that are certificated for 
operation in the United States.

Explanation of Requirements of Proposed Rule

    Since an unsafe condition has been identified that is likely to 
exist or develop on other airplanes of the same type design registered 
in the United States, the proposed AD would require a one-time visual 
inspection of the hydraulic tubes and electrical harness wires of the 
wing rear access door for chafing, leakage, or wear damage; repair of 
any discrepancy found; and modification of the wing rear access door.
    Repair of the hydraulic tubes would be required to be accomplished 
in accordance with a method approved by the FAA. Other actions would be 
required to be accomplished in accordance with the Saab service 
bulletin described previously.

Cost Impact

    The FAA estimates that 3 Saab Model SAAB 2000 series airplanes of 
U.S. registry would be affected by this proposed AD, that it would take 
approximately 4 work hours per airplane to accomplish the proposed 
actions, and that the average labor rate is $60 per work hour. Required 
parts would be provided by the manufacturer at no cost to operators. 
Based on these figures, the cost impact of the proposed AD on U.S. 
operators is estimated to be $720, or $240 per airplane.
    The cost impact figure discussed above is based on assumptions that 
no operator has yet accomplished any of the proposed 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 proposed herein would 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 
proposal would not have sufficient federalism implications to warrant 
the preparation of a Federalism Assessment.
    For the reasons discussed above, I certify that this proposed 
regulation (1) is not a ``significant regulatory action'' under 
Executive Order 12866; (2) is not a ``significant rule'' under the DOT 
Regulatory Policies and Procedures (44 FR 11034, February 26, 1979); 
and (3) if promulgated, 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 copy of the draft 
regulatory evaluation prepared for this action is contained in the 
Rules Docket. A copy of it may be obtained by contacting the Rules 
Docket at the location provided under the caption ADDRESSES.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Safety.

The Proposed Amendment

    Accordingly, pursuant to the authority delegated to me by the 
Administrator, the Federal Aviation Administration proposes to amend 
part 39 of the Federal Aviation Regulations (14 CFR part 39) as 
follows:

[[Page 34026]]

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:

    SAAB Aircraft AB: Docket 96-NM-220-AD.

    Applicability: Model SAAB 2000 series airplanes, serial numbers 
-004 through -030 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 (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 damage to the hydraulic tubes and electrical 
harnesses, which could lead to failure of the number 2 hydraulic 
system or loss of certain electrical and landing systems, and 
resultant reduced controllability of the airplane, accomplish the 
following:
    (a) Within 60 days after the effective date of this AD, perform 
a one-time visual inspection of the hydraulic tubes and electrical 
harness wires of the wing rear access door for chafing, leakage, or 
wear damage; in accordance with paragraph B. of the Accomplishment 
Instructions of Saab Service Bulletin 2000-53-010, Revision 01, 
dated October 10, 1995.
    (1) If any chafing or leakage of the hydraulic tubes is 
detected, prior to further flight, repair in accordance with a 
method approved by the Manager, Standardization Branch, ANM-113, 
FAA, Transport Airplane Directorate.
    (2) If any damage to the metal braid or wire insulation is 
detected, prior to further flight, repair in accordance with 
paragraph E. of the Accomplishment Instructions of Saab Service 
Bulletin 2000-53-010, Revision 01, dated October 10, 1995.
    (b) Within 60 days after the effective date of this AD, modify 
the wing rear access door and apply silicon tape to the electrical 
harnesses, in accordance with paragraph C. of the Accomplishment 
Instructions of Saab Service Bulletin 2000-53-010, Revision 01, 
dated October 10, 1995.
    (c) As of the effective date of this AD, no person shall install 
wing rear access doors, part numbers 7353500-713/ -714 or 7353500-
715/ -716, on any airplane, unless the part has been modified in 
accordance with Saab Service Bulletin 2000-53-010, Revision 01, 
dated October 10, 1995.
    (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, Standardization Branch, ANM-113. 
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.

    (e) 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.

    Issued in Renton, Washington, on June 17, 1997.
S.R. Miller,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 97-16407 Filed 6-23-97; 8:45 am]
BILLING CODE 4910-13-U