1、Lessons Learned Entry: 0173Lesson Info:a71 Lesson Number: 0173a71 Lesson Date: 1992-10-22a71 Submitting Organization: KSCa71 Submitted by: David PenningtonSubject: Deservicing and Weather Protection at Dryden Flight Research Center (DFRC). Description of Driving Event: Flammable and toxic vapors can
2、 be expelled into the deservicing hangar at DFRC, providing a potential for fire, explosion and toxicity above the permissible exposure limits (PEL). No venting is planned, however, pressure bleed vents do exist on these systems and are expected to boil off and vent periodically in short bursts if t
3、he fuel cells have been secured.Lesson(s) Learned: Use of the DFRC hangar for deservicing/weather protection after landing could result in fire/explosion and/or personnel injury.Recommendation(s): Monitor for MMH, N2O4, and N2H4 continuously during deservicing operations and shut down all electrical
4、 equipment prior to entering the hangar.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 Energetic Materials - Ex
5、plosive/Propellant/Pyrotechnica71 Flight Equipmenta71 Ground Operationsa71 Hazardous/Toxic Waste/MaterialsAdditional Info: Approval Info: a71 Approval Date: 1994-06-06a71 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-,-,-
