NASA OIG on Shuttle H2 Sensors

Final Memorandum on the Review of the Space Shuttle Liquid Hydrogen Fuel Tank Sensors, NASA OIG

“We found that the Project Office initiated appropriate actions to identify and resolve LH2 sensor nonconformance issues by reviewing manufacturing and testing processes. As a result, the Project Office recommended that modifications be made to the supplier’s manufacturing process and to the contractor’s acceptance testing processes. In addition, we found that because of the Project Office’s review, the contractor implemented a detailed inventory control measure that segregated the sensors into two inventories–Flight Ready inventory and 74L4-2 Parts inventory.”