scope:

Abstract:

Due to a transient effect, the Wide-Field Infrared Explorer (WIRE) telescope aperture cover was unintentionally ejected when the WIRE pyro electronics box was first powered. The cryogen subsequently vented, resulting in mission loss. Pyro electronics design, such as the use of pyro inhibits, must consider transient effects known to occur upon powering of the pyro electronics. Conduct detailed, independent technical peer reviews of the system design, and electronics power turn-on characterization tests that can detect anomalous behavior such as subtle transient events.