The issues with the array were followed in the same year by problems with the starboard Solar Alpha Rotary Joint ( SARJ ), which rotates the arrays on the starboard side of the station.
12.
The first step of reconfiguring the power took place Wednesday when the port solar array on the P6 truss will be retracted, which allowed the activation and rotation of the Solar Alpha Rotary Joint on the P4.
13.
The FHRC provides the transfer of liquid ammonia across the Thermal Radiator Rotary Joint ( TRRJ ) between the P1 ( FHRC SN1001 ) & S1 ( FHRC SN1002 ) truss segments and the Heat Rejection System Radiators ( HRSRs ).
14.
Burbank made a seven-hour extravehicular activity ( EVA ), a . k . a . a " spacewalk, " that completed P3 / P4 truss installation, activated the solar alpha rotary joint and enabled the solar arrays to be deployed.
15.
This was enough to leave the port side arrays in a safe position to commence the activation of the Solar Alpha Rotary Joint ( SARJ ) at 01 : 00 UTC, allowing the solar arrays on the P3 / P4 truss to rotate to follow the sun.
16.
John Shannon mentioned that managers have decided to add a task to the second EVA, asking the astronauts to visually inspect the Solar Alpha Rotary Joint ( SARJ ) on the starboard side, as the joint has registered some vibration for the past month and a half.
17.
Starting with four types of joints, the rotary joint, sliding joint, cam joint and gear joint, and related connections such as cables and belts, it is possible to understand a machine as an assembly of solid parts that connect these joints called a mechanism.
18.
The antenna feed is usually considered to be all the components between the beam-shaping part of the antenna and the receiver's first amplifier ( called the RF front end, the feed horn, orthomode transducer, polarizer, frequency diplexer, waveguide, waveguide switches, rotary joint, etc.
19.
It consisted primarily of a 6-DOF rotary joint robotic arm, its flight avionics ( the Manipulator Control Unit or MCU ) and arm vision system, two On-Orbit Replaceable Units ( ORUs ) and their spacecraft attachment interfaces, a visual target and grapple fixture installed on NEXTSat, and the Manipulator Ground Segment.
20.
STS-122 also carried the Solar Monitoring Observatory ( SOLAR ), the European Technology Exposure Facility ( EuTEF ), and a new Nitrogen Tank Assembly, mounted in the cargo bay of an ICC-Lite payload rack, as well as a spare Drive Lock Assembly ( DLA ) sent to orbit in support of possible repairs to the starboard Solar Alpha Rotary Joint ( SARJ ) which is malfunctioning.
