The FAA has issued a new airworthiness directive (AD) that applies to certain American Champion Aircraft Corp. Model 8KCAB airplanes. The AD came about after a report of a cracked hinge support and cracked hinge ribs that caused a partial loss of control during flight when the aileron became stuck. The AD requires fabrication and installation of a placard that prohibits aerobatic flight for affected airplanes, an inspection of the aileron hinge rib and support, and for pilots/aircraft owners to report the results of their inspection to the FAA.
The AD applies to the following Model 8KCAB airplanes certificated in any category:
In the report provided to the FAA, the pilot said that the aileron became stuck during some phases of flight, but that they were able to un-stick the aileron and land. After an inspection, they found “cracked structure around several of the aileron hinges.” According to the FAA, if the condition is not corrected, it could lead to “failure of the aileron support structure; leading to excessive deflection, binding of the control surface, and potential loss of control.”
The FAA notes that they have reviewed American Champion Aircraft’s Service Letter (SL) 442 regarding the issue and that the AD requires accomplishing the actions outlined in the service information except where they specify different or additional actions, which will be outlined below.
As of April 12, 2017, the FAA says that any airplane subject to the AD must have a placard fabricated and placed in it reading ‘AEROBATIC FLIGHT PROHIBITED.’ The placard must use at least 1/8 inch letters, and be placed on the instrument panel within the pilot’s clear view. The fabrication and placement of the placard can be done by the owner/operator. The airplane will be restricted to 10 hours of non-aerobatic flight until the following actions are taken:
The FAA notes several differences between SL 442 and the AD:
The FAA says that actions required by the AD take precedence over SL 442.
To read the AD as posted on the Federal Register, click here.
And to read SL 442 from American Champion, click here.
The FAA estimates the AD affects 64 airplanes and also estimates the following cost to comply:
|Action||Labor cost||Parts cost||Cost per product||Cost on U.S. operators|
|Fabrication of placard, inspection of aileron hinge rib and support, and report of findings to the FAA||2 work-hours × $85 per hour = $170.00||$100||$270.00||$17,280|
The FAA notes that this is a final rule, and was not preceded by notice and an opportunity for public comment. However, the agency says that they welcome any “written data, views, or arguments” regarding the AD, and more specifically, “comments on the overall regulatory, economic, environmental, and energy aspects of this AD.” Comments can be submitted online or through the address information provided in the posting. The FAA says to include docket number FAA-2017-0283 and Directorate Identifier 2017-CE-009-AD at the beginning of your comments and adds that they will consider all comments received by May 30, 2017, and that they may amend the AD based on comments received.
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