Rideshare payload user’s guide october 2022

RIDESHARE PAYLOAD USER’S GUIDE
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7.5.2

LAUNCH CONTROL
Launch countdown monitoring and access to Payload telemetry throughout the Launch countdown is available as an optional service (see Appendix I. Space within the Launch Control Center would be shared between Payload and Co-
Payload Customers, as documented in a Launch Campaign Plan.
7.5.3

ROLLOUT AND PAD OPERATIONS
After all Payload and Co-Payload(s) EGSE is disconnected and readiness is verified the integrated Launch Vehicle maybe rolled out from the hangar to the pad on the TE. Once the Launch Vehicle is at the pad, the fairing air conditioning system is reconnected, which helps maintain environmental control through liftoff. Electrical connectivity is provided via ground cables (reference Section 4.3.6). The Launch Vehicle will typically be erected only once, although the capability exists to easily return it to a horizontal orientation if necessary.
7.5.4

COUNTDOWN
The Launch Vehicle is designed to support a countdown duration as short as one hour. Early in the countdown, the vehicle performs LOX, RP and pressurant loading, and it executes a series of vehicle and range checkouts. The TE strongback is retracted just prior to launch. Automated software sequencers control all critical Launch Vehicle functions during terminal countdown. Final Launch activities include verifying flight termination system status, transferring to internal power, and activating the transmitters. Engine ignition occurs shortly before liftoff, while the Launch Vehicle is held down at the base via hydraulic clamps. The flight computer evaluates engine ignition and full -power performance during the prelaunch hold-down, and if nominal criteria are satisfied, the hydraulic release system is activated at TA safe shutdown is executed should any off-nominal condition be detected.

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