The concern sheetPartly OCR
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U.S. Department of Transportation
Federal Aviation Administration Airworthiness Concern Sheet Date: August 3, 2026
Reply to:
Name: David Bae Title: Aviation Safety Engineer (Airframe) Office: East Certification Branch Street Address: 1701 Columbia Ave City, State, ZIP: College Park, GA 30337 Telephone: 404-863-2604 Electronic Mail: David.H.Bae@faa.gov
Make: Twin Commander Model / Serial Numbers: All serial numbers for – 500, 500A, 500B, 500S, 500U – 520 – 560, 560A, 560E, 560F – 680, 680E, 680F, 680F(P), 680FL, 680FL(P), 680T, 680V, 680W – 681 – 685 – 690, 690A, 690B, 690C, 690D – 695, 695A, 695B – 720
Reason for Airworthiness Concern:
Lower Wing Skin Cracking Federal Aviation Administration (FAA) Description of Airworthiness Concern Twin Commander Aircraft LLC (Twin Commander) issued Maintenance Alert MA23001 on July 24, 2023 following two reports of cracks initiating at the radii of the lower wing skin cutouts for the main landing gear truss. These cracks were initially discovered on piston-powered aircraft conducting low-level surveys. There is a concern that such cracks might go undetected during routine maintenance, leading to continued cracking and reduction in wing residual strength . Maintenance Alert MA23001 recommends a recurring visual inspection, supplemented by either a high frequency eddy current inspection or a liquid penetrant inspection, of the skin cut-out area to detect any cracks within six months and annually thereafter. Since the issuance of MA23001, additional aircraft including turboprop models have been identified with similar lower wing skin cracking.
Additionally, the Commonwealth of Australia Civil Aviation Safety Authority (CASA) issued Airworthiness Directive AD/AC/92 - Wing Skin Near Main Landing Gear. The FAA determined that an AD was not necessary at the time CASA issued its AD.
This Airworthiness Directive mandates that Australian operators perform a recurring, visual inspection for cracks on the wing skin near the main landing gear every 1,000 hours or less, or every 500 hours or less when the aircraft is engaged in low-level survey flights. This Airworthiness Directive was based on reports of cracks found in cutouts on the lower surface of the wing in two aircraft, both of which were 500S models performing low-level surveys.
Request for Information The FAA is interested in receiving any information on wing skin cracks at the MLG truss cut outs from owners, operators, mechanics, and maintenance personnel of the listed models of Twin Commander listed in the effectivity of this Airworthiness Concern Sheet (ACS). We recommend operators inspect these areas per Maintenance Alert MA23001 and provide information including:
- Aircraft registration and serial number
- Aircraft flight hours and flight hours at time of inspection
- Usage related to the aircraft’s industry sector and/or Public Use operations (e.g., low level survey, firefighting, medevac, agriculture, scenic flights, Department of the Interior, US Forest Service, etc.)
- Any positive or negative findings of wing skin crack length and location/orientation
- Available photos of crack findings
- Inspection methods utilized to locate the crack
Please provide any other information you feel may be helpful for us to consider as part of our evaluation. Please also provide a report of no findings if the inspection was completed and no cracks were found
This Airworthiness Concern Sheet (ACS) is intended as a means for FAA Aviation Safety Engineers to coordinate airworthiness concerns with aircraft owners/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 Airworthiness Directive (AD) action or a Special Airworthiness Information Bulletin (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 club comments.
Attachments:
Service Difficulty Report Accident/Incident Data System Service Letter / Bulletin Special Airworthiness Information Bulletin Federal Aviation Administration or National Transportation Safety Board Safety Recommendation Airworthiness Directive Alternate Means of Compliance Risk Analysis Transmittal:
Federal Aviation Administration Airplane Owners and Pilots Association Experimental Aircraft Association Type Club Type Certificate Holder Other:
Response Requested By:
Emergency (10 days) Alert (30 days) Information (90 days)
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MAINTENANCE ALERT Inspection For Cracks In Lower Wing Skins Around MLG Truss Cutouts
NO POSTAGE
NECESSARY
IF MAILED IN THE
UNITED STATES
BUSINESS REPLY MAIL FIRST-CLASS MAIL PERMIT NO. 1 CREEDMOOR NO
POSTAGE WILL BE PAID BY ADDRESSEE Twin Commander Aircraft LLC 1176 Telecom Dr Creedmoor NC 27522-9912 6 of 6