Displays mission elapsed time in days, hours, minutes, and seconds using individual lamps for each numeric segment.
Black “dot” above display illuminates red to indicate failure of a display segment.
In-flight NASA photo of
shows the location of the forward mission timer.
are circuit cards to drive each display. Note the precision cut lid for supporting the circuit cards.
The connector is on the side because of limited space behind the control panel.
This simulator unit was used in training.
2.74 lbs. (1.22 kg)
NASA photo of astronaut Mamoru Mohri on
flight deck during STS-99. Arrow points to the mission timer on panel O3.
Historic Space Systems at www.space1.com
Controls & Displays