Payload Retention System

The Payload Retention System (PRS) provides the means for restraining deployable or attached payloads in the payload bay and consists of combinations of Payload Retention Latch Actuators (PRLA) and Active Keel Actuators (AKA). The PRLA is the primary load bearing device counteracting the X-X and Z-Z flight loads. The AKA acts as centering device and carries the Y-Y flight loads. Bridge fittings are used to react the loads imparted to the orbiter structure by the payload and provide a structural interface for the PRLA and AKA. Extended guides, painted yellow with black stripes, attach to the forward and aft surfaces to enhance visual cues during payload berthing. A maximum of 15 latches can be flown in any combination of PRLAs and AKAs based on flight specific needs. The PRS provides crew displays and controls for monitoring and operating the PRS from the orbiter's flight deck via Panel A6U and SPEC 97 (OPS 2 & 4).

The photos and video below were taken after OV-105 had flown the STS-99 mission, in which the PRS carried the SRTM (Space Radar Topographic Mission) payload. The AKAs are not visible in these photos.

Starboard PRLA located between payload bay door pushrods #4 [left] and #5 [top] (from window W9).

Starboard PRLA located between pushrods #3 (shown) and #2 (from window W10).

Port PRLA located between payload bay door pushrods #6 and #5 [right] (from window W9).

Port PRLA located between payload bay door pushrods #5 and #4 [right] (from window W9).

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created March - May 2000 / last updated April 2002