The concern sheet
Text extracted from the PDF.
May 16, 2006 Make, Model, Series, Serial No.: Thrush (Ayres, Rockwell, Commander) Models and serial numbers as listed on Thrush Service Bulletin SB-AG-45 Rev. A
Name: Cindy Lorenzen Title: Program Manager Organization: Aircraft Certification Office Address: 1895 Phoenix Blvd., Ste. 450 Atlanta, Georgia 30349 Telephone: (770)703-6078 E-mail: cindy.lorenzen@faa.gov Reason for Airworthiness Concern: Cracked tail attach fittings, broken attach bolts, and cracked vertical fin aft spar
Thrush Aircraft Inc. has issued Service Bulletin SB-AG-45, Rev. A, to repetitively inspect, every 100 hours, for cracks in the vertical stabilizer attach fitting, the horizontal attach fitting, and bolt until the parts are replaced with improved attach fittings. The service bulletin also requires inspection of the vertical fin aft spar for cracks and repair of cracks, if found. The service bulletin can be found at www.thrushaircraft.com.
The FAA is considering making Service Bulletin SB-AG-45, Rev. A, mandatory through a routine Airworthiness Directive. We would propose to require the first inspection within 50 hours time in service from the effective date of the AD and to retain the 100 hour inspection intervals in the service bulletin. We would propose using 5X or 10X magnification during the visual inspections. We would also propose replacement of the vertical stabilizer attach fitting (p/n 40301-7), the horizontal attach fitting (p/n 40303-1/-4/-7 or 95267-1), and bolt (p/n NAS1105-68) with the improved attach fittings (p/n 95266-3 and 95267-5) and larger bolt (p/n NAS6207-68) within the next 2 years or 2000 hours, whichever occurs first, as a terminating action to the AD.
Request for Information:
The FAA would like persons familiar with the Thrush airplane to suggest any alternatives to the inspections or replacement requirements outlined above. Please be as specific as possible when sending suggestions.
Airworthiness Concern Sheet
Attachments: Risk Assessment ⌧ Notification: FAA* ⌧, AOPA* ⌧, EAA* , Type Club ⌧, TC* Holder ⌧, Other ____
Response Requested by 8/16/2006 - Emergency (10 days) , Alert (30 days) , Information (90 days) ⌧ * Federal Aviation Administration (FAA), Aircraft Owners & Pilots Association (AOPA);
Experimental Aircraft Association (EAA); Type Certificate (TC)
This Airworthiness Concern Sheet (ACS) is intended as a means for FAA Aviation Safety Engineers to coordinate airworthiness concerns with aircraft owner/operators through associations and type clubs. At this time, the FAA has not made a determination on what type of corrective action (if any) should be taken. The resolution of this airworthiness concern could involve an AD action or an SAIB, or the FAA could determine that no action is needed at this time. The FAA’s final determination will depend in part on the information received in response to this ACS.
The FAA endorses dissemination of this technical information to all manufacturers and requests association and type clubs comments.
Service documents this concern sheet cites · 1
Manufacturers’ service documents named in its text, as OpenAirDocs read them: check each against the text. “Copy” marks those OpenAirDocs holds.
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'https://openairdocs.org/service-documents/' || d.document_id AS page_url
FROM 'https://openairdocs.org/data/latest/service_document_citation.parquet' c JOIN 'https://openairdocs.org/data/latest/service_document.parquet' d USING (document_id)
WHERE c.record_type = 'faa_concern_sheet' AND c.record_id IN ('FAA00000000000ACS_750200602S5500') AND d.issuer_kind <> 'authority'
QUALIFY row_number() OVER (PARTITION BY c.document_id, c.revision_key ORDER BY c.record_date DESC) = 1
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