Air carrier flight crew reported a traffic conflict while trying to land at an uncontrolled airport....

Narrative:

My first report to [radio] and area traffic on the common traffic advisory frequency was at 25 NM to the north on the rnp RNAV. I gave an accurate ETA; [radio] acknowledged; told us a [military] helicopter was in the traffic pattern. I heard him make a couple of calls on 123.6 as we progressed on our approach.I made a call at 7 miles on final. Didn't get any acknowledgement from helicopter. We broke out of clouds at about 6 miles. At about 3 miles I could visually make out a helicopter sitting (or hovering low) about 1000' down the runway. Then [radio] addressed the helicopter by its call sign with something to the effect of 'there is a [commercial aircraft] on a 3 mile final'. No response. I made a call; 'air carrier X on short final'; no response. [Radio] asked us to state our intentions just as we were initiating a go-around. The pilot flying (PF) offset slightly to the right as we did the go-around because we didn't know what the helicopter would do and wanted more separation. We flew right traffic in VMC and landed normally. All the helicopter said was something to the effect of 'sorry about that'.on downwind I verified with [radio] that [they] heard all of my radio calls.

Original NASA ASRS Text

Title: Air Carrier flight crew reported a traffic conflict while trying to land at an uncontrolled airport. The conflict; which resulted in a go-around; was with a helicopter that was not adhering to standard radio procedures.

Narrative: My first report to [radio] and area traffic on the common traffic advisory frequency was at 25 NM to the north on the RNP RNAV. I gave an accurate ETA; [radio] acknowledged; told us a [military] helicopter was in the traffic pattern. I heard him make a couple of calls on 123.6 as we progressed on our approach.I made a call at 7 miles on final. Didn't get any acknowledgement from helicopter. We broke out of clouds at about 6 miles. At about 3 miles I could visually make out a helicopter sitting (or hovering low) about 1000' down the runway. Then [radio] addressed the helicopter by its call sign with something to the effect of 'There is a [commercial aircraft] on a 3 mile final'. No response. I made a call; 'Air Carrier X on short final'; no response. [Radio] asked us to state our intentions just as we were initiating a go-around. The Pilot Flying (PF) offset slightly to the right as we did the go-around because we didn't know what the helicopter would do and wanted more separation. We flew right traffic in VMC and landed normally. All the helicopter said was something to the effect of 'sorry about that'.On downwind I verified with [radio] that [they] heard all of my radio calls.

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.

Attributes
ACN	1381110
Time
Date	201608
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Aircraft 2
Make Model Name	Helicopter
Flight Phase	Initial Approach
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Conflict Airborne Conflict Deviation - Procedural Published Material / Policy

Air carrier flight crew reported a traffic conflict while trying to land at an uncontrolled airport. The conflict; which resulted in a go-around; was with a helicopter that was not adhering to standard radio procedures.