1、Lessons Learned Entry: 1253Lesson Info:a71 Lesson Number: 1253a71 Lesson Date: 1999-03-29a71 Submitting Organization: KSCa71 Submitted by: Maria TobinSubject: Inadvertent activation of a flight termination system (FTS) during an Air Force Unmanned Aerial Vehicle (UAV) mission. Description of Driving
2、 Event: During a cross-range flight test mission of the Global Hawk (UAV) from Edwards AFB, CA through the adjacent range operated by NAWC-WD, China Lake, CA, the nominal vehicle inadvertently received the arm and destruct commands from an uninvolved range. Flight vehicle No. 2 was lost as a result.
3、 The vehicle crashed without fire (all fuel was expelled from the wingtips) within the restricted area of R2515 with no injuries to personnel or other property.Lesson(s) Learned: 1. Because UAVs now operate at very high altitudes to long duration times, frequency deconfliction between neighboring ra
4、nges (regions) was implemented throughout DoD. Prior to this accident, FTS frequencies were only deconflicted within regions.2. 3. The uninvolved range was testing its FTS ground transmitter in support of a future mission. The range radiated the FTS commands open-loop at full power. DoD has implemen
5、ted new procedures to always perform tests of the FTS ground transmitting systems closed-loop into dummy loads.Recommendation(s): 1. NASA programs/projects and NASA ranges should make sure these procedures are followed for all missions and/or support of missions.2. 3. NASA is working with DoD to dev
6、elop a new technology for FTS that will provide a digital and encrypted system to prevent this type of problem from happening again.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Evidence of Recurrence Control Effectiveness: N/ADocuments Related to
7、Lesson: N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 Aircrafta71 Flight Operationsa71 Range OperationsAdditional Info: Approval Info: a71 Approval Date: 2002-07-09a71 Approval Name: Gena Bakera71 Approval Organization: KSCa71 Approval Phone Number: 321-867-4261Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
