REG NASA-LLIS-1624-2005 Lessons Learned - Engine Preservation for Long Term Storage.pdf

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1、Lessons Learned Entry: 1624Lesson Info:a71 Lesson Number: 1624a71 Lesson Date: 2005-06-23a71 Submitting Organization: DFRCa71 Authored by: Michael TobermanSubject: Engine Preservation for Long Term Storage Abstract: Pratt and Whitney F100-PW-229 engines were not preserved and caused cost and schedul

2、e impacts to the project. Description of Driving Event: The engines were not preserved and cost the project over $100K and around two months of schedule slip. Our engines need to be preserved and rotated every six months. After a year, they need to be run. This is in accordance to Pratt and Whitneys

3、 maintenance procedures. After they found out we did nothing to preserve them or rotate them, the management at Pratt and Whitney insisted that we needed to tear them down for inspection and that we would definitely find rust on our main bearings. Their initial recommendation was to tear down every

4、component and send each one to its respective manufacturer for teardown and inspection. In fact, in the engine documentation it states that these bearings are highly susceptible to corrosion. At this point, the project could have ended because of the lack of replacement engines and the excessive cos

5、ts incurred by following this recommendation. After further discussions with Pratt and Whitney, they determined that inspections to a few key components, like the main bearings, followed by an extended engine run with oil samples was sufficient as long as nothing off-nominal was detected. The inspec

6、tions took place and the engines were run, with no signs of corrosion. It should be noted that engineers and technicians with a lot of engine experience at Dryden felt that none of this was necessary and that Pratt and Whitney did not understand the non-corrosive environment that the engines were ke

7、pt in. But to reduce risk, we followed the manufacturers advice. Lesson(s) Learned: Ensure that engines follow manufacturers recommendations for storage or document how the Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-engines are going to be prese

8、rved if it deviates from manufacturers recommendations. Recommendation(s): Follow manufacturers recommendations for engine storage or document the deviation from this as determined by the Operations Engineer, Crew Chief and approved by the Chief of Maintenance. Evidence of Recurrence Control Effecti

9、veness: N/ADocuments Related to Lesson: N/AMission Directorate(s): a71 Exploration Systemsa71 Aeronautics ResearchAdditional Key Phrase(s): a71 Aircrafta71 Flight Equipmenta71 Flight Operationsa71 Ground Operationsa71 Hardwarea71 Packaginga71 Handlinga71 Storagea71 Partsa71 Materialsa71 Program and

10、Project Managementa71 Safety & Mission Assurancea71 ProcessesAdditional Info: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Approval Info: a71 Approval Date: 2006-03-20a71 Approval Name: dkruhma71 Approval Organization: HQProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-