Frequencies —Stowed array: Lateral—out of plane = 17 Hz Lateral—in plane = 31 Hz Longitudinal = 35 Hz —Deployed array Bending—out of plane = 1.54 Hz Bending—in plane = 3.20 Hz Torsion = 5.74 Hz 2.3 Flight Performance The APPLE spacecraft went into orbit in June 1981 and performed all the specified functions successfully for more than two years of its useful life. The performance of the solar array mechanism can be summarized as follows: • The south face solar array wing was deployed successfully. The limit switch monitoring also confirmed the full deployment status. • There was no frequency mismatch as indicated by the smooth manoeuvering operations of the AOCS (Attitude and Orbit Control System). 2.4 Performance Anomalies The north face solar array wing failed to deploy. A systematic analysis of the anomalous behaviour of one of the wings has been carried out [1]. 3. IRS Solar Array Mechanism The Indian Remote Sensing Satellite (IRS) of 1000 kg mass is for a sun synchronous polar mission, and the 700 watts end-of-life (EOL) power needs of the satellite are to be generated through 6-panel deployable arrays, equally shared by 2 array wings one each on either side of spacecraft [2].
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