REG NASA-LLIS-0202-1992 Lessons Learned - Ice Team Inspection.pdf

1、Lessons Learned Entry: 0202Lesson Info:a71 Lesson Number: 0202a71 Lesson Date: 1992-11-06a71 Submitting Organization: KSCa71 Submitted by: Lisa L. MusgraveSubject: Ice Team Inspection Description of Driving Event: In the early morning hours before launch, a KSC ice team performed an inspection of th

2、e Challenger and pad. Their specific aim was to check for the amount and type of ice. They had with them an infrared gun designed to measure surface temperatures. This instrument was focused on the external tank and Solid Rocket Boosters (SRBs) during the course of the survey. The infrared gun indic

3、ated temperatures on the right SRB of from seven to nine degrees Fahrenheit, compared to 23 to 25 degrees for the left SRB. This discrepancy was not reported to launch team officials. Later, tests indicated the infrared gun requires a minimum of 40 minutes to stabilize at the temperatures experience

4、d at KSC on the morning of the launch. The gun was focused on the right SRB prior to the time it had stabilized, indicating the readings taken were not reliable. Ice team members displayed a lack of sensitivity to potentially hazardous conditions to which they were evaluating and, nevertheless, shou

5、ld have reported the low readings.Lesson(s) Learned: The ice team failed to report discrepancies when analyzing flight hardware temperatures using instruments without understanding of operational limits.Recommendation(s): Thoroughly train all evaluation teams in the use of any instruments they handl

6、e and supply appropriate criteria to evaluate results.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): N/AAdditional Key Phrase(s): a71 Environmen

7、ta71 Flight Equipmenta71 Ground Operationsa71 Ground Equipmenta71 Test & VerificationAdditional Info: Approval Info: a71 Approval Date: 1994-06-08a71 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-,-,-