1、Lessons Learned Entry: 0615Lesson Info:a71 Lesson Number: 0615a71 Lesson Date: 1997-04-20a71 Submitting Organization: HQa71 Submitted by: Miles WhitnahSubject: Shuttle Hatch Opening Anomaly Description of Driving Event: In preparation for a scheduled Extra Vehicular Activity (EVA) during STS-80, the
2、 crew discovered that they were unable to open the airlock outer hatch.Lesson(s) Learned: Post-flight inspection found that the hatch anomaly was traced to the hatch actuator internal mechanism. Per inspection, it was determined that one of the two screws fasteners for the clutch housing retainer ha
3、d inadvertently backed out and was wedged between the first stage planetary gear and the ring gear.Recommendation(s): Validate where specified self-locking inserts are required. In addition specify torque values.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/AMission
4、 Directorate(s): Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/AAdditional Key Phrase(s): a71 Parts Materials & ProcessesAdditional Info: Approval Info: a71 Approval Date: 1999-03-31a71 Approval Name: Bill Loewya71 Approval Organization: QSa71 Approval Phone Number: 202-358-0528Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
