REG NASA-LLIS-0093-1992 Lessons Learned - Loose Access Door Reporting and Securing Contamination Air Plenum Access Door Hinges.pdf

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1、Lessons Learned Entry: 0093Lesson Info:a71 Lesson Number: 0093a71 Lesson Date: 1992-07-29a71 Submitting Organization: KSCa71 Submitted by: David PenningtonSubject: Loose Access Door Reporting and Securing; Contamination Air Plenum Access Door Hinges Description of Driving Event: An access panel loca

2、ted at the aft end of the orbiter just right of the rudder, broke loose from its attaching hardware and the contamination air plenum. The access panel fell and hit the orbiter maneuvering system (OMS) pod handling fixture below. The access panel did not touch the vehicle or the OMS pod. OMS pod remo

3、val operations were in progress when the door fell. The door started working loose approximately three weeks prior to the incident, and a trouble call was made. Blue tape was found on the door edges except for the hinged side.Lesson(s) Learned: 1. Hinged access panels frequently lose structural inte

4、grity near the hinge line and may break off.2. Pop rivets used to secure access door hinges frequently work their way out leaving the door and hinges dangerously loose.Recommendation(s): 1. Access panel hinge regions that show excessive wear should be repaired upon discovery.2. Replace all access do

5、or rivets with plate nuts and screws. In addition, adding a safety chain/lanyard would further increase the safety margin.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/

6、AMission Directorate(s): a71 Space Operationsa71 Exploration SystemsAdditional Key Phrase(s): a71 Flight Equipmenta71 Hardwarea71 Launch Vehiclea71 Lifting DevicesAdditional Info: Approval Info: a71 Approval Date: 1994-06-02a71 Approval Name: James G. Klinea71 Approval Organization: KSC/HEIa71 Approval Phone Number: 407-867-7614Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-