F/A-22 resumes testing Published March 28, 2003 EDWARDS AIR FORCE BASE, Calif. (AFPN) -- F/A-22 Raptor test and training flight operations resumed here March 22 after a brief delay following a nose-gear-retraction incident.On March 18, the nose gear of an F/A-22 retracted unexpectedly as the engines were being shut down. The incident occurred after successful completion of a routine training mission.No one was injured in the incident, and the aircraft received only minimal damage.The precise cause of the incident is being investigated.Ground testing and other developmental work continued during the suspension. Suspensions of this nature are typical during the aircraft developmental testing phase, officials said. Procedures have been developed to prevent a repeat of the incident. Those procedures will remain in place until the precise cause is discerned and mitigated, the officials said.The Raptor is expected to enter operational service in 2005. The test and training program is evaluating the aircraft to ensure it will operate as designed and meet Air Combat Command's requirements.