REG NASA-LLIS-0507-1994 Lessons Learned - Prevention of LaRC T-38 Canopy Failures.pdf

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1、Lessons Learned Entry: 0507Lesson Info:a71 Lesson Number: 0507a71 Lesson Date: 1994-07-13a71 Submitting Organization: LARCa71 Submitted by: Bernard LewisSubject: Prevention of LaRC T-38 Canopy Failures Description of Driving Event: On 10-15-90 the T-38 Aircraft (N511NA) belonging to LaRC was on a lo

2、cal training flight. At the time of rotation, the rear canopy separated from the aircraft, damaging both the canopy and the vertical stabilizer. The pilot made an uneventful landing. The canopy loss was most probably caused by the failure of the external handle force input to complete latching of th

3、e canopy hooks. There is also strong circumstantial evidence that the canopy latching mechanism contains a design deficiency. JSC has fathered two T-38 canopy locking modifications. One modifies the outer access door for the external canopy handle and was on N511NA at the time of the canopy failure.

4、 The other modification includes a warning horn which sounds if either canopy switch indicates an unlatch and the throttle is moved past 96%. This modification was not on N511NA at the time of canopy failure.Lesson(s) Learned: It is possible to prevent LaRC T-38 canopy failures using existing modifi

5、cations.Recommendation(s): The investigation committee made four recommendations:1. The JSC devised warning horn modification should be added to N511NA (done)2. Preflight procedures should include a post canopy closure checkoff by ground service personnel (done)3. JSC procedures for canopy operation

6、 should be incorporated into Langley T-38 pre-flight procedures (done)4. Pilot sensitivity should be raised as to the nature of the T-38 canopy locking problem history and the need to ensure canopy lock prior to takeoff (done).Provided by IHSNot for ResaleNo reproduction or networking permitted with

7、out license from IHS-,-,-There have been no subsequent canopy failures on N511NA.Evidence of Recurrence Control Effectiveness: Since the LaRC T-38 was appropriately modified, there have been no canopy failures.Documents Related to Lesson: N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 A

8、ircrafta71 Ground Operationsa71 HardwareAdditional Info: Approval Info: a71 Approval Date: 1997-04-02a71 Approval Name: Elijah C. Kenta71 Approval Organization: 421a71 Approval Phone Number: 757-864-3345Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-