Document ID: FAA-2017-0777-0001
Agency: faa
Document Type: Proposed Rule
Title: Airworthiness Directives: Saab AB, Saab Aeronautics (Formerly Known as Saab AB, Saab Aerosystems) Airplanes
Posted Date: 2017-08-15T04:00Z

[Federal Register Volume 82, Number 156 (Tuesday, August 15, 2017)]
[Proposed Rules]
[Pages 38621-38623]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2017-17095]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2017-0777; Product Identifier 2017-NM-050-AD]
RIN 2120-AA64

Airworthiness Directives; Saab AB, Saab Aeronautics (Formerly 
Known as Saab AB, Saab Aerosystems) Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: We propose to adopt a new airworthiness directive (AD) for 
certain Saab AB, Saab Aeronautics Model SAAB 340B airplanes. This 
proposed AD was prompted by reports of natural stall events in icing 
conditions, without prior stall warnings. This proposed AD would 
require modifying the stall warning system, installing new stall 
warning computers, and activating the stall warning system. We are 
proposing this AD to address the unsafe condition on these products.

DATES: We must receive comments on this proposed AD by September 29, 
2017.

ADDRESSES: You may send comments, using the procedures found in 14 CFR 
11.43 and 11.45, by any of the following methods:
     Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for submitting comments.
     Fax: 202-493-2251.
     Mail: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue SE., Washington, DC 20590.
     Hand Delivery: Deliver to Mail address above between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
    For service information identified in this NPRM, contact Saab AB, 
Saab Aeronautics, SE-581 88, Link[ouml]ping, Sweden; telephone +46 13 
18 5591; fax +46 13 18 4874; email

[[Page 38622]]

saab340techsupport@saabgroup.com; Internet http://www.saabgroup.com. 
You may view this service information at the FAA, Transport Standards 
Branch, 1601 Lind Avenue SW., Renton, WA. For information on the 
availability of this material at the FAA, call 425-227-1221.

Examining the AD Docket

    You may examine the AD docket on the Internet at http://www.regulations.gov by searching for and locating Docket No. FAA-2017-
0777; or in person at the Docket Management Facility between 9 a.m. and 
5 p.m., Monday through Friday, except Federal holidays. The AD docket 
contains this NPRM, the regulatory evaluation, any comments received, 
and other information. The street address for the Docket Operations 
office (telephone 800-647-5527) is in the ADDRESSES section. Comments 
will be available in the AD docket shortly after receipt.

FOR FURTHER INFORMATION CONTACT: Shahram Daneshmandi, Aerospace 
Engineer, International Section, Transport Standards Branch, FAA, 1601 
Lind Avenue SW., Renton, WA 98057-3356; telephone: 425-227-1112; fax: 
425-227-1149.

SUPPLEMENTARY INFORMATION: 

Comments Invited

    We invite you to send any written relevant data, views, or 
arguments about this proposal. Send your comments to an address listed 
under the ADDRESSES section. Include ``Docket No. FAA-2017-0777; 
Product Identifier 2017-NM-050-AD'' at the beginning of your comments. 
We specifically invite comments on the overall regulatory, economic, 
environmental, and energy aspects of this NPRM. We will consider all 
comments received by the closing date and may amend this NPRM based on 
those comments.
    We will post all comments we receive, without change, to http://www.regulations.gov, including any personal information you provide. We 
will also post a report summarizing each substantive verbal contact we 
receive about this NPRM.

Discussion

    The European Aviation Safety Agency (EASA), which is the Technical 
Agent for the Member States of the European Union, has issued EASA 
Airworthiness Directive 2017-0067, dated April 24, 2017 (referred to 
after this as the Mandatory Continuing Airworthiness Information, or 
``the MCAI''), to correct an unsafe condition for certain Saab AB, Saab 
Aeronautics Model SAAB 340B airplanes. The MCAI states:
    A few natural stall events, specifically when operating in icing 
conditions, have been experienced on SAAB 340 series aeroplanes, 
without receiving a prior stall warning.
    This condition, if not corrected, could result in loss of 
control of the aeroplane.
    To address this potential unsafe condition, SAAB developed a 
modified stall warning system, incorporating improved stall warning 
logic, and issued various Service Bulletins (SB) providing 
instructions to replace the Stall Warning Computer (SWC) with a new 
SWC, and instructions to activate the new SWC. The new system 
includes stall warning curves optimized for operation in icing 
conditions, which are activated by selection of Engine Anti-Ice.
    Consequently, EASA issued AD 2014-0218 [which corresponds to FAA 
AD 2016-22-15, Amendment 39-18704 (81 FR 76843, November 4, 2016)] 
to require installation and activation of the improved SWC. That 
[EASA] AD excluded certain SAAB 340B aeroplanes by s/n.
    Since EASA AD 2014-0218 was issued, SAAB developed a technical 
solution applicable for some of those previously excluded 
aeroplanes, and issued SB 340-27-117 and SB 340-27-118, providing 
instructions to modify and activate the new SWC.
    For the reasons described above, this [EASA] AD requires 
installation and activation of the improved SWC.

    You may examine the MCAI in the AD docket on the Internet at http://www.regulations.gov by searching for and locating Docket No. FAA-2017-
0777.

Related Service Information Under 1 CFR Part 51

    Saab AB, Saab Aeronautics has issued Service Bulletin 340-27-117, 
dated January 23, 2017. The service information describes procedures 
for modifying the stall warning system.
    Saab AB, Saab Aeronautics has also issued Service Bulletin 340-27-
118, dated January 23, 2017. The service information describes 
procedures for installing new stall warning computers and activating 
the modified stall warning system.
    This service information is reasonably available because the 
interested parties have access to it through their normal course of 
business or by the means identified in the ADDRESSES section.

FAA's Determination and Requirements of This Proposed AD

    This product has been approved by the aviation authority of another 
country, and is approved for operation in the United States. Pursuant 
to our bilateral agreement with the State of Design Authority, we have 
been notified of the unsafe condition described in the MCAI and service 
information referenced above. We are proposing this AD because we 
evaluated all pertinent information and determined an unsafe condition 
exists and is likely to exist or develop on other products of the same 
type design.

Costs of Compliance

    We estimate that this proposed AD affects 4 airplanes of U.S. 
registry.
    We estimate the following costs to comply with this proposed AD:

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                    Cost per       Cost on U.S.
              Action                        Labor cost            Parts cost        product         operators
----------------------------------------------------------------------------------------------------------------
Modification, installation, and     78 work-hours x $85 per           $33,000          $39,630         $158,520
 activation.                         hour = $6,630.
----------------------------------------------------------------------------------------------------------------

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.
    This proposed AD is issued in accordance with authority delegated 
by the Executive Director, Aircraft

[[Page 38623]]

Certification Service, as authorized by FAA Order 8000.51C. In 
accordance with that order, issuance of ADs is normally a function of 
the Compliance and Airworthiness Division, but during this transition 
period, the Executive Director has delegated the authority to issue ADs 
applicable to transport category airplanes to the Director of the 
System Oversight Division.

Regulatory Findings

    We 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 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);
    3. Will not affect intrastate aviation in Alaska; and
    4. 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.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, 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

0
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]

0
2. The FAA amends Sec.  39.13 by adding the following new airworthiness 
directive (AD):

Saab AB, Saab Aeronautics (Formerly Known as Saab AB, Saab 
Aerosystems): Docket No. FAA-2017-0777; Product Identifier 2017-NM-
050-AD.

(a) Comments Due Date

    We must receive comments by September 29, 2017.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to Saab AB, Saab Aeronautics (formerly known as 
Saab AB, Saab Aerosystems) Model SAAB 340B airplanes, certificated 
in any category, serial numbers 362, 363, 385, and 405.

(d) Subject

    Air Transport Association (ATA) of America Code 27, Flight 
Controls.

(e) Reason

    This AD was prompted by reports of natural stall events in icing 
conditions, without prior stall warnings. We are issuing this AD to 
prevent a natural stall event in icing conditions without any stall 
warning, which could result in loss of control of the airplane.

(f) Compliance

    Comply with this AD within the compliance times specified, 
unless already done.

(g) Modification

    Within 12 months after the effective date of this AD, do the 
actions specified in paragraphs (g)(1) and (g)(2) of this AD.
    (1) Install a provision for a modified stall warning system, in 
accordance with the Accomplishment Instructions of Saab Service 
Bulletin 340-27-117, dated January 23, 2017.
    (2) Install new stall warning computers and activate the 
modified stall warning system, in accordance with the Accomplishment 
Instructions of Saab Service Bulletin 340-27-118, dated January 23, 
2017.

(h) Parts Installation Prohibition

    After modification of an airplane as required by paragraph (g) 
of this AD, no person may install a stall warning computer having 
part number (P/N) 20AK5 or P/N 0020AK5 on that airplane.

(i) Other FAA AD Provisions

    The following provisions also apply to this AD:
    (1) Alternative Methods of Compliance (AMOCs): The Manager, 
International Section, Transport Standards Branch, FAA, has the 
authority to approve AMOCs for this AD, if requested using the 
procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19, 
send your request to your principal inspector or local Flight 
Standards District Office, as appropriate. If sending information 
directly to the International Section, send it to the attention of 
the person identified in paragraph (j)(2) of this AD. Information 
may be emailed to: 9-ANM-116-AMOC-REQUESTS@faa.gov. Before using any 
approved AMOC, notify your appropriate principal inspector, or 
lacking a principal inspector, the manager of the local flight 
standards district office/certificate holding district office.
    (2) Contacting the Manufacturer: For any requirement in this AD 
to obtain corrective actions from a manufacturer, the action must be 
accomplished using a method approved by the Manager, International 
Section, Transport Standards Branch, FAA; or the European Aviation 
Safety Agency (EASA); or Saab AB, Saab Aeronautics's EASA Design 
Organization Approval (DOA). If approved by the DOA, the approval 
must include the DOA-authorized signature.

(j) Related Information

    (1) Refer to Mandatory Continuing Airworthiness Information 
(MCAI) EASA Airworthiness Directive 2017-0067, dated April 24, 2017, 
for related information. This MCAI may be found in the AD docket on 
the Internet at http://www.regulations.gov by searching for and 
locating Docket No. FAA-2017-0777.
    (2) For more information about this AD, contact Shahram 
Daneshmandi, Aerospace Engineer, International Section, Transport 
Standards Branch, FAA, 1601 Lind Avenue SW., Renton, WA 98057-3356; 
telephone: 425-227-1112; fax: 425-227-1149.
    (3) For service information identified in this AD, contact Saab 
AB, Saab Aeronautics, SE-581 88, Link[ouml]ping, Sweden; telephone 
+46 13 18 5591; fax +46 13 18 4874; email 
saab340.techsupport@saabgroup.com; Internet http://www.saabgroup.com. You may view this service information at the FAA, 
Transport Standards Branch, 1601 Lind Avenue SW., Renton, WA. For 
information on the availability of this material at the FAA, call 
425-227-1221.

    Issued in Renton, Washington, on August 3, 2017.
Jeffrey E. Duven,
Director, System Oversight Division, Aircraft Certification Service.
[FR Doc. 2017-17095 Filed 8-14-17; 8:45 am]
 BILLING CODE 4910-13-P