AIX is the operating system, not the server. IBM's Power (aka pSeries, System P, RS/6000) hardware can run AIX, Linux or IBM i (what used to be AS/400).
Any reasonably modern server, including the 560, can run Linux in an LPAR (logical partition, like VMs) alone or alongside other LPARs. RedHat, SUSE and some other vendors have versions of Linux for Power.
edit: Re-reading your question, yes, I've done a network install of Linux from an AIX machine using BOOTP/TFTP/NFS. Get syslinux for PPC64 (CHRP) and setup bootp and tftp. Boot the Linux LPAR into SMS and setup it's networking under 'Setup Remote IPL'. Boot off the NIC, then select an FTP or NFS install and point it at your install media. You'll need to use the VNC based installer as well.
When you're done installing you might need to tell the firmware which disk to boot (bootlist -m normal /dev/sd??)
Last edited by wingnut64; 12-23-2013 at 06:26 PM.