1、Lessons Learned Entry: 0927Lesson Info:a71 Lesson Number: 0927a71 Lesson Date: 2001-02-22a71 Submitting Organization: ARCa71 Submitted by: Chuck Connors, Sr.Subject: KAO (Kuiper Airborne Observatory) Gauge Calibration Problem During Aircraft Pressure Test Description of Driving Event: During the pre
2、-modification pressure test, the contractor had a difficult time in reaching the full pressure test value. The clam shell doors were open and the aft seals around the door were inverted and letting air escape. The contractor was preparing to get additional compressors when it was noticed that the sk
3、in of the aircraft appeared to be bowed. The test was immediately halted and NASA requested that the pressure gauges be checked for proper calibration. The contractor discovered that the gauges were out of calibration and were reading a lower pressure and it was determined that they had actually rea
4、ched the full test pressure value and even exceeded this value.Lesson(s) Learned: Make sure gauges are calibrated and that there is documentation to substantiate successful calibration prior to the start of the test.Recommendation(s): Both NASA and the contractor worked very hard to substantiate tha
5、t no structural damage had occurred. This task was successful but it took quite an effort at a very busy time in the program. To avoid a similar incident like this one, it is recommended that successful calibration of the gauges be checked and to provide a relief valve in the pressurization system t
6、hat will protect the aircraft from being overpressurized.Evidence of Recurrence Control Effectiveness: N/AProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Documents Related to Lesson: N/AMission Directorate(s): a71 Exploration Systemsa71 Aeronautics R
7、esearchAdditional Key Phrase(s): a71 Aircrafta71 Ground Operationsa71 Ground Equipmenta71 Hardwarea71 Pressure Vesselsa71 Test Facilitya71 Test & VerificationAdditional Info: Approval Info: a71 Approval Date: 2001-03-05a71 Approval Name: Eric Raynora71 Approval Organization: QSa71 Approval Phone Number: 202-358-4738Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
