Helicopter
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 7
Situational Awareness; Communication Breakdown
Conflict NMAC; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Took Evasive Action
Procedure; Human Factors
Aircraft Y was in left traffic for landing runway 22.  Aircraft X reported 'Homer traffic...on final 22.'Aircraft X was near midfield and landing long when he spotted Aircraft Y landing on runway 22.  Aircraft X then turned right to enter a midfield right downwind to provide spacing.  Aircraft X contacted Aircraft Y and stated 'We almost had a midair.'My role was only monitoring in nature. Aircraft X pilot never contacted me and the first traffic call I heard from him was 'final 22.'  Had he contacted me 'Homer Radio'; I would have given him a traffic advisory and ensured he had monitored the Aerodrome Flight Information Service (AFIS).I filled out the Mandatory Occurrence Report (MOR) paperwork and was unable to enter the information into Comprehensive Electronic Data Analysis and Reporting (CEDAR) because my shift had ended and I was scheduled to work [a few] hours later.  I faxed the MOR papers to my parent facility and asked them if they would enter it into CEDAR due to my circumstances. They said they would.I have now learned that my manager believes that I did not properly follow procedure and should have entered the data into CEDAR myself.If the Aircraft X pilot would have contacted Homer Radio at 3 or more miles out; he would have been informed via airport advisory service of the pattern traffic.  The Aircraft Y had landing priority because he was in a closed traffic pattern while the Aircraft X entered straight in from the northeast for 22 and only reported final for 22.
A HOM FSS Controller reports of hearing a pilot report to another pilot that they had a NMAC.