05-17404. Airworthiness Directives; Saab Model SAAB 2000 Airplanes

AGENCY:

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

ACTION:

Notice of proposed rulemaking (NPRM).

SUMMARY:

The FAA proposes to adopt a new airworthiness directive (AD) for certain Saab Model SAAB 2000 airplanes. This proposed AD would require modifying the manual feather-and-unfeather system for the propellers to make the design of the system more robust. This proposed AD results from reports of in-flight engine shutdown caused by uncommanded operation of the feather pump of the propeller. We are proposing this AD to prevent uncommanded feathering of the propeller, which could result in the shutdown of an engine during flight and consequent reduced controllability of the airplane.

DATES:

We must receive comments on this proposed AD by October 3, 2005.

ADDRESSES:

Use one of the following addresses to submit comments on this proposed AD.

• DOT Docket Web site: Go to http://dms.dot.gov and follow the instructions for sending your comments electronically.
• Government-wide rulemaking Web site: Go to http://www.regulations.gov and follow the instructions for sending your comments electronically.
• Mail: Docket Management Facility, U.S. Department of Transportation, 400 Seventh Street SW., Nassif Building, Room PL-401, Washington, DC 20590.
• Fax: [phone].
• Hand Delivery: Room PL-401 on the plaza level of the Nassif Building, 400 Seventh Street SW., Washington, DC, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays.

Contact Saab Aircraft AB, SAAB Aircraft Product Support, S-581.88, Linköping, Sweden, for service information identified in this proposed AD.

FOR FURTHER INFORMATION CONTACT:

Mike Borfitz, Aerospace Engineer, International Branch, ANM-116, FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington 98055-4056; telephone [phone]; fax [phone].

SUPPLEMENTARY INFORMATION:

Comments Invited

We invite you to submit any relevant written data, views, or arguments regarding this proposed AD. Send your comments to an address listed in the ADDRESSES section. Include the docket number “FAA-2005-22255; Directorate Identifier 2005-NM-106-AD” at the beginning of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of the proposed AD. We will consider all comments received by the closing date and may amend the proposed AD in light of those comments.

We will post all comments we receive, without change, to http://dms.dot.gov,, including any personal information you provide. We will also post a report summarizing each substantive verbal contact with FAA personnel concerning this proposed AD. Using the search function of that Web site, anyone can find and read the comments in any of our dockets, including the name of the individual who sent the comment (or signed the comment on behalf of an association, business, labor union, etc.). You may review the DOT's complete Privacy Act Statement in the Federal Register published on April 11, 2000 (65 FR 19477-78), or you may visit http://dms.dot.gov.

Examining the Docket

You may examine the AD docket on the Internet at http://dms.dot.gov,, or in person at the Docket Management Facility office between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The Docket Management Facility office (telephone [phone]) is located on the plaza level of the Nassif Building at the DOT street address stated in the ADDRESSES section. Comments will be available in the AD docket shortly after the Docket Management System receives them.

Discussion

The Luftfartsstyrelsen (LFS), which is the airworthiness authority for Sweden, notified us that an unsafe condition may exist on certain Saab Model SAAB 2000 airplanes. The LFS has received reports of in-flight engine shutdown due to uncommanded operation of the feather pump of the propeller, which caused the propeller to feather. The uncommanded activation of the feather pump has been attributed to an uncommanded operation of the remote control circuit breaker (RCCB) within the manual feather-and-unfeather system. This condition, if not corrected, could result in the shutdown of an engine during flight and consequent reduced controllability of the airplane.

Relevant Service Information

Saab has issued Service Bulletin 2000-61-006, Revision 01, dated February 17, 2005. The service bulletin describes procedures for modifying the manual feather-and-unfeather system for the propellers to make the design of the system more robust. The modification involves replacing the RCCBs with relays, installing new wiring, and making associated structural modifications to the left and right wing fairings. Accomplishing the actions specified in the service information is intended to adequately address the unsafe condition. The LFS mandated the service information and issued Swedish airworthiness directive 1-198, dated February 14, 2005, to ensure the continued airworthiness of these airplanes in Sweden.

FAA's Determination and Requirements of the Proposed AD

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 LFS has kept the FAA informed of the situation described above. We have examined the LFS's findings, evaluated all pertinent information, and determined that we need to issue an AD for airplanes of this type design that are certificated for operation in the United States.

Therefore, we are proposing this AD, which would require accomplishing the actions specified in the service information described previously.

Costs of Compliance

This proposed AD would affect about 3 airplanes of U.S. registry. The proposed actions would take about 50 work hours per airplane, at an average labor rate of $65 per work hour. Required parts would cost about $13,571 per airplane. Based on these figures, the estimated cost of the proposed AD for U.S. operators is $50,463, or $16,821 per airplane.

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 have determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would 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 that the 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. 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 proposed AD and placed it in the AD docket. See the ADDRESSES section for a location to examine the regulatory evaluation.

List of Subjects in 14 CFR Part 39

• Air transportation
• Aircraft
• Aviation safety
• Safety

The Proposed Amendment

Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 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.

§ 39.13

[Amended]

2. The Federal Aviation Administration (FAA) amends § 39.13 by adding the following new airworthiness directive (AD):

Saab Aircraft AB: Docket No. FAA-2005-22255; Directorate Identifier 2005-NM-106-AD.

Comments Due Date

(a) The FAA must receive comments on this AD action by October 3, 2005.

Affected ADs

(b) None.

Applicability

(c) This AD applies to SAAB Model SAAB 2000 airplanes, certificated in any category, serial numbers -004 through -063 inclusive.

Unsafe Condition

(d) This AD results from reports of in-flight engine shutdown caused by uncommanded operation of the feather pump of the propeller. We are issuing this AD to prevent uncommanded feathering of the propeller, which could result in the shutdown of an engine during flight and consequent reduced controllability of the airplane.

Compliance

(e) You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.

Modification

(f) Within 12 months after the effective date of this AD, modify the manual feather-and-unfeather system of the propellers by doing all actions specified in the Accomplishment Instructions of Saab Service Bulletin 2000-61-006, Revision 01, dated February 17, 2005.

Actions Accomplished Previously

(g) A modification accomplished before the effective date of this AD in accordance with Saab Service Bulletin 2000-61-006, dated December 20, 2004, is acceptable for compliance with paragraph (f) of this AD.

Alternative Methods of Compliance (AMOCs)

(h) The Manager, International Branch, ANM-116, Transport Airplane Directorate, FAA, has the authority to approve AMOCs for this AD, if requested in accordance with the procedures found in 14 CFR 39.19.

Related Information

(i) Swedish airworthiness directive 1-198, dated February 14, 2005, also addresses the subject of this AD.

Issued in Renton, Washington, on August 24, 2005.

Ali Bahrami,

Manager, Transport Airplane Directorate, Aircraft Certification Service.