A flight crew landing at an airport where the tower was closed communicated on unicom instead of CTA...

Attributes
ACN	1666910
Time
Date	201907
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Dawn
Aircraft 1
Make Model Name	Challenger 350
Operating Under FAR Part	Part 91
Flight Phase	Landing
Route In Use	Visual Approach
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine
Person 2
Function	Captain Pilot Not Flying
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Conflict Ground Conflict Less Severe Deviation - Procedural Published Material / Policy Ground Event / Encounter Other / Unknown

Narrative:

Acting as pilot flying in left seat on a scheduled 91k flight with 2 passengers during closed tower operations. Upon release from center; the pilot monitoring cancelled IFR and switched to unicom frequency; making all appropriate VFR calls for approach; landing; and taxi. Upon landing; we were met at the aircraft by airfield operations who asked if we knew they were on the runway on our approach. I stated I saw them on a taxiway to the left of the runway. The gentleman said he was on the runway and heard no calls on the radio on CTAF frequency. I stated I heard the pilot monitoring making all calls and the FBO heard all calls. Pilot monitoring and pilot flying discussed radio frequencies and recognized we were on unicom and not CTAF on arrival and the airfield ops personnel stated they do not monitor unicom.after review of aim and fom; was still unclear as to priority of frequencies; determined crew should have been talking and monitoring CTAF. Review priority of frequencies when CTAF and unicom is provided in addition to recommending airfield operations personnel monitor both frequencies.

Original NASA ASRS Text

Title: A flight crew landing at an airport where the Tower was closed communicated on Unicom instead of CTAF when there were ground personnel working on the runway monitoring CTAF.

Narrative: Acting as Pilot Flying in left seat on a scheduled 91k flight with 2 passengers during closed Tower operations. Upon release from Center; the Pilot Monitoring cancelled IFR and switched to Unicom frequency; making all appropriate VFR calls for approach; landing; and taxi. Upon landing; we were met at the aircraft by Airfield Operations who asked if we knew they were on the runway on our approach. I stated I saw them on a taxiway to the left of the runway. The gentleman said he was on the runway and heard no calls on the radio on CTAF frequency. I stated I heard the Pilot Monitoring making all calls and the FBO heard all calls. Pilot Monitoring and Pilot Flying discussed radio frequencies and recognized we were on Unicom and not CTAF on arrival and the Airfield Ops personnel stated they do not monitor Unicom.After review of AIM and FOM; was still unclear as to priority of frequencies; determined crew should have been talking and monitoring CTAF. Review priority of frequencies when CTAF and Unicom is provided in addition to recommending airfield operations personnel monitor both frequencies.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

A flight crew landing at an airport where the tower was closed communicated on unicom instead of CTAF when there were ground personnel working on the runway monitoring CTAF.