Assertion: spacecraft's mission | /r/CapableOf | roll orientation
Facets:
value: to a heads
type: TRANSITIVE-OBJECT
value: at t+6 minutes
type: TEMPORAL
Source sentences:
text: On earlier missions the Space Shuttle remained in the heads-down orientation to maintain communications with the tracking station in Bermuda, but later missions, beginning with STS-87, rolled to a heads up orientation at T+6 minutes for communication with the tracking and data relay satellite constellation.