Shuttle Team to Modify Fuel Sensors; Jan. 10 launch off

Shuttle Team to Modify Fuel Sensors; Jan. 10 launch off

Image above: Workers look at the outside of the external tank on space shuttle Atlantis at Launch Pad 39A at NASA's Kennedy Space Center. Photo credit: NASA/Kim Shiflett
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Dec. 27

The Space Shuttle Program met Thursday to assess the progress made to troubleshoot an issue with the engine cutoff sensor circuit that occurred during the recent launch attempts and tanking test. Instrumentation installed for the tanking test indicate that there are one or more intermittent open circuits in the area of the feed through connector on the external tank’s liquid hydrogen tank.

The external parts of the connector will be removed and replaced with others that have been strategically soldered to ensure pin-to-socket connectivity and allow continuous electrical flow from sensors inside the external tank to the shuttle's computers.

This work will take some time to properly accomplish and to certify the redesigned configuration before flight. While a launch on Jan. 10 is no longer achievable, no launch date has been discussed. The program will take time to assess progress of the work before setting a target launch date.

Media Resources
› STS-122 Press Kit (15 Mb PDF)
› STS-122 Fact Sheet (7.6 Mb PDF)
› STS-122 TV Schedule
› ECO Sensor's Morning Press Briefing (Real Player Video)

Engine Cutoff (ECO) sensors graphics:
› LH₂ ECO Sensor Locations
› Overall Schematic of ECO and Liquid Level (Point) Sensors
› Orbiter Avionics Bays
› Orbiter Aft Avionics Bays
› Functional Block Diagram of Point Sensor Box
› Exploded View of Point Sensor Box