Airworthiness directives › 2012-24-06
AD 2012-24-06 Airworthiness Directives; Saab AB, Saab Aerosystems Airplanes
Models named: SAAB 340B. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Saab AB, Saab Aerosystems Model 340A (SAAB/SF340A) and SAAB 340B airplanes, certificated in any category, as identified in paragraphs (c)(1) and (c)(2) of this AD, except airplanes that have SAAB Modification 2650 and/or 2859 installed. This AD does not apply to airplanes with serial numbers 170, 342, 362, 363, 367, 372, 379, 385, 395, 405, 409, 431, and 455. (1) Model 340A (SAAB/SF340A) airplanes, serial numbers 004 through 159 inclusive. (2) Model SAAB 340B airplanes, serial numbers 160 through 459 inclusive.
Compliance
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Required actions
(1) For airplanes with basic wing tips: Within 24 months after the effective date of this AD, replace all stall warning computers (SWCs) having part number (P/N) 0020AK, 0020AK1, 0020AK2, or 0020AK4, with a new SWC P/N 0020AK6, in accordance with the Accomplishment Instructions of Saab Service Bulletin 340-27-098, Revision 01, dated April 13, 2012. (2) For airplanes with extended wing tips: Within 24 months after the effective date of this AD, replace the SWC P/N 0020AK3 MOD 1 with a new SWC P/N 0020AK7, in accordance with the Accomplishment Instructions of Saab Service Bulletin 340-27-099, Revision 01, dated April 13, 2012.
Unsafe condition
This AD was prompted by reports of stall events during icing conditions where the natural stall warning (buffet) was not identified. We are issuing this AD to prevent natural stall events when operating in icing conditions, which, if not corrected, could result in loss of control of the airplane.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1