Helicopter pilot reported a near midair collision while on initial approach.

Attributes
ACN	1552760
Time
Date	201806
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Bell Helicopter 412
Operating Under FAR Part	Part 91
Flight Phase	Initial Approach
Route In Use	Visual Approach
Flight Plan	None
Aircraft 2
Make Model Name	PA-28 Cherokee/Archer/Dakota/Pillan/Warrior
Operating Under FAR Part	Part 91
Person 1
Function	Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor Flight Crew Multiengine Flight Crew Instrument
Experience	Flight Crew Last 90 Days 100 Flight Crew Total 3500 Flight Crew Type 3100
Events
Anomaly	Conflict NMAC
Miss Distance	Horizontal 250 Vertical 0

Narrative:

Ferry flight conducted in law enforcement bell 412 medium lift helicopter to ZZZ. Route of flight was south along the shore line at 500 feet or less. At approximately 7.25 nm from ZZZ radio contact was established with ZZZ tower. Tower called my aircraft out to another aircraft who acknowledged they had me in sight. At approximately 6 nm miles north east of ZZZ; I observed the aircraft (PA28) at my five o clock position and only about 250 feet from my aircraft and at the same altitude. The PA28 made sharp climbing turn to the right (south). The aircraft was traveling west to east before making an evasive maneuver. I queried ZZZ tower; who advised the traffic was called out. After landing I called ZZZ tower to inquire further. They stated the aircraft is based at ZZZ1. It is unclear if the PA28 pilot did not see me or intentionally flew that close to my aircraft. The PA28 continued south along the shore at 200 feet.

Original NASA ASRS Text

Title: Helicopter pilot reported a NMAC while on initial approach.

Narrative: Ferry flight conducted in law enforcement Bell 412 medium lift helicopter to ZZZ. Route of flight was south along the shore line at 500 feet or less. At approximately 7.25 nm from ZZZ radio contact was established with ZZZ Tower. Tower called my aircraft out to another aircraft who acknowledged they had me in sight. At approximately 6 nm miles north east of ZZZ; I observed the aircraft (PA28) at my five o clock position and only about 250 feet from my aircraft and at the same altitude. The PA28 made sharp climbing turn to the right (south). The aircraft was traveling west to east before making an evasive maneuver. I queried ZZZ Tower; who advised the traffic was called out. After landing I called ZZZ Tower to inquire further. They stated the aircraft is based at ZZZ1. It is unclear if the PA28 pilot did not see me or intentionally flew that close to my aircraft. The PA28 continued south along the shore at 200 feet.

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.