1、Lessons Learned Entry: 0359Lesson Info:a71 Lesson Number: 0359a71 Lesson Date: 1995-10-11a71 Submitting Organization: HQa71 Submitted by: Pete RutledgeSubject: Pitot-Static Heating/Icing Description of Driving Event: During the course of its test program at Dryden Flight Research Center, Edwards, CA
2、 the X-31 experimental aircraft was retrofitted with an unheated Pitot-static probe (of the Kiel probe design). Unexpected icing of the single-string Pitot-static air data source resulted in the aircraft departing controlled flight and crashing.Photo of the x-31 jet in flight Close-up Photo of the
3、PitotX-31 Experimental Aircraft Pitot-Static ProbeLesson(s) Learned: Even in normally dry, temperate environments, humidity/temperature conditions at flight altitude can be such as to result in icing of the Pitot-static probe if a heater is not provided.Recommendation(s): Consider the use of Pitot-s
4、tatic heating, even in the case of experimental aircraft used exclusively in normally dry, temperate environments.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/AMission
5、 Directorate(s): N/AAdditional Key Phrase(s): a71 Aircrafta71 Environmenta71 Flight EquipmentAdditional Info: Approval Info: a71 Approval Date: 1995-10-12a71 Approval Name: Pete Rutledgea71 Approval Organization: NASA HQ Code QSa71 Approval Phone Number: 202-358-0579Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
