Unfortunately you cannot do this from the WLC directly. If you have WCS/NCS installed you can setup a scheduled configuration task that turns off the desired APs radios via an AP Configuration Template, then create another scheduled configuration task that enables those APs radios again with another AP Configuration Template.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
This is the start of a display filter cross reference between Wireshark
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