Airworthiness directives › 2017-13-11
AD 2017-13-11 Airworthiness Directives; Gulfstream Aerospace Corporation Airplanes
Models named: G-IV. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to all Gulfstream Aerospace Corporation Model G-IV airplanes, certificated in any category.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 36 months after the effective date of this AD, modify the gust lock system by doing a retrofit of the gust lock throttle interlock, in accordance with the Accomplishment Instructions of the applicable service information specified in paragraph (g)(1), (g)(2), or (g)(3) of this AD. (1) Gulfstream IV Customer Bulletin Number 236B, dated February 3, 2017. (2) Gulfstream G300 Customer Bulletin Number 236B, dated February 3, 2017. (3) Gulfstream G400 Customer Bulletin Number 236B, dated February 3, 2017.
Unsafe condition
This AD was prompted by a report indicating that the G-IV gust lock system allows more throttle travel than was intended and could allow the throttle to be advanced to reach take-off thrust. The intended function of the gust lock system is to restrict throttle lever movement to a maximum of 6 degrees of forward travel, which provides an unmistakable warning to the pilot that the gust lock system is still engaged, prohibiting the use of the primary flight control surfaces. We are issuing this AD to prevent the throttle lever movement from advancing more than 6 degrees of forward travel, which could result in the aircraft reaching near take-off thrust and high velocities without primary flight controls (aileron, elevator, and rudder) and cause a failure to rotate during take-off and high speed runway overrun.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1