That is what I thought, however I read the following in Aruba's App Note on Spectrum Analysis (from page 8):
When the radio is in a spectrum monitor mode its primary responsibility is to perform spectrum scanning across the entire band of operation. This data is then fed up to the Aruba Mobility Controller and AirWave. The APs also scans for wireless IDS event detection, rogue detection and containment, but it does not serve clients in this mode.