AD FAA-2014-0003

We are superseding Airworthiness Directive (AD) 2013-03-23 for all Gulfstream Aerospace LP (Type Certificate previously held by Israel Aircraft Industries, Ltd.) Model Gulfstream G150 airplanes. AD 2013-03- 23 required revising the airplane flight manual (AFM) to include procedures to advise the flightcrew of certain runway slope and anti- ice corrections and takeoff distance values. This new AD requires revising the Performance section of the AFM, which includes the revised procedures. This AD was prompted by the issuance of a revision to the AFM, which modifies runway slope and anti-ice corrections to both V<INF>1</INF> and takeoff distance values. We are issuing this AD to prevent the use of published, non-conservative data, which could result in the inability to meet the required takeoff performance, with a consequent hazard to safe operation during performance-limited takeoff operations.