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Fri, Nov 13, 2009

AD: Piaggio

AD NUMBER: 2009-21-08

MANUFACTURER: PIAGGIO AERO INDUSTRIES S.p.A Model PIAGGIO P-180 Airplanes
SUBJECT: Airworthiness Directive 2009-21-08

SUMMARY: 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:

Some cases of uncommanded steering action were observed, while the steering system was switched off. A leakage in the Steering Select/Bypass Valve, installed in the Steering Manifold, when closed, is suspected to have caused the uncommanded steering.

If left uncorrected, this condition could lead to a potentially dangerous veer along the runway; in fact, according to the Aircraft Flight Manual limitations, the steering system must be in `off' position during landing and takeoff (in this case when airspeed is higher than 60 knots).

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

FMI: http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAD.nsf/0/0A0F99DF86531089862576690053E7A5?OpenDocument

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