1、Lessons Learned Entry: 1622Lesson Info:a71 Lesson Number: 1622a71 Lesson Date: 2005-06-05a71 Submitting Organization: DFRCa71 Authored by: Thomas GrindleSubject: Aircraft Impacted By an Unsecured/Pressurized GN2 Hose Abstract: On December 3, 2002 a “close call” involving a B52B aircraft, NASA 008, o
2、ccurred as it was under going pre-flight for a mission the following day. During the preflight, a gaseous nitrogen servicing hose was pressurized to approximately 5200 psi without the servicing end connected to the aircraft. The hose end rose up and struck the aircraft numerous times, puncturing the
3、 upper surface of the right flap in two places. The flow valve was shut off when the hose became lodged under a servicing cart tire. No one was injured. Description of Driving Event: The servicing hose was not secured (safety lanyards or sandbagged) nor connected to the aircraft when it was charged
4、with gaseous nitrogen. Lesson(s) Learned: 1. All high-pressure hoses must be connected before pressurizing.2. All high-pressure hoses must be restrained with either safety lanyards or sandbags prior to pressurizing.3. When stored, all high-pressure hoses should have high-pressure caps installed.Reco
5、mmendation(s): The end users of are responsible for verifying that the equipment they are using is serviceable, and that procedures are current and followed, since they are the ones who are most likely to be hurt if something goes wrong. Provided by IHSNot for ResaleNo reproduction or networking per
6、mitted without license from IHS-,-,-Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: DCP - S - 009, Chapter 8Mission Directorate(s): a71 Exploration Systemsa71 Aeronautics ResearchAdditional Key Phrase(s): a71 Accident Investigationa71 Aircrafta71 Flight Equipmenta71 Ground Equipmenta71 Ground Operationsa71 Pressure VesselsAdditional Info: Approval Info: a71 Approval Date: 2006-04-12a71 Approval Name: dkruhma71 Approval Organization: HQProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
