for information only. Effectivity 5001.5151 73 INF PIE 21 Jan 2009 ASC 970700 Airframe ASC 70 Nose Landing Gear Door EFF: G550 aircraft, Actuator Modification serial numbers 5001- 518711 NOTE: Mandatory for SIN 5001 - 5177 per CB 58 issued 12/10/2007 32 MAN CM GAC APPLETON FP549 CRS G1FR100Y 20.