AD NUMBER: 2009-26-08

MANUFACTURER: AeroSpace Technologies of Australia Pty Ltd Models N22B, N22S, and N24A Airplanes
SUBJECT: Airworthiness Directive 2009-26-08

SUMMARY: We are superseding an existing airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:

Late in 2002 the manufacturer advised CASA of another Nomad accident which was possibly caused by aileron flutter with the flaps at 38 degrees. This, along with the other flutter incidents, has resulted in the manufacturer issuing ANMD-57-18 Issue 1 as a precautionary measure while they further investigate the issue.

The manufacturer has now completed their investigation and issued Alert Service Bulletin ANMD-27-53 to modify flap actuation linkages to restore the necessary rigidity to the outboard flap, and hence the aileron. The unacceptable flexibility of the outboard flap mechanism allows flutter to occur in extreme circumstances.

We are issuing this AD to require actions to correct the unsafe condition on these products.

DATES: This AD becomes effective February 1, 2010.

FMI: http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAD.nsf/list/2009-26-08?OpenDocument