PA28R pilot reported near midair collision on approach to jyo airport.

Narrative:

While on approach to jyo; I (pilot flying) was monitoring the CTAF and regularly reporting my position northwest of the airport as well as my intention to enter the traffic pattern. I was accompanied by another pilot (not flying). I heard the pilot of a cirrus report his straight in approach for runway 17 followed by an aircraft on the ground query his IFR status. The pilot on the ground expressed his agitation with the pilot of the cirrus because he had been forced to wait for his IFR departure clearance until the cirrus pilot cancelled IFR. After a short exchange between the two other pilots; the pilot of the cirrus reported short final and no other CTAF calls were made by either pilot until the cirrus reported clear of the runway.at this point I was 2 miles northwest of the airport on a 45 degree course relative to runway 17 to join the 17 upwind and execute a left traffic pattern. I was distracted with the before landing checklist when a TCAS alert warned me of traffic and the pilot not flying called my attention to an oncoming twin engine turboprop on a reciprocal course climbing 200-300 ft above. We proceeded and landed without further incident. Neither myself nor the pilot not flying heard a departure announcement on the CTAF from the turboprop; and we were unaware of its position until the TCAS alert. I had reported my position relative to the field less than a minute prior to the incident.

Original NASA ASRS Text

Title: PA28R pilot reported NMAC on approach to JYO airport.

Narrative: While on approach to JYO; I (pilot flying) was monitoring the CTAF and regularly reporting my position northwest of the airport as well as my intention to enter the traffic pattern. I was accompanied by another pilot (not flying). I heard the pilot of a Cirrus report his straight in approach for Runway 17 followed by an aircraft on the ground query his IFR status. The pilot on the ground expressed his agitation with the pilot of the Cirrus because he had been forced to wait for his IFR departure clearance until the Cirrus pilot cancelled IFR. After a short exchange between the two other pilots; the pilot of the Cirrus reported short final and no other CTAF calls were made by either pilot until the Cirrus reported clear of the runway.At this point I was 2 miles northwest of the airport on a 45 degree course relative to Runway 17 to join the 17 upwind and execute a left traffic pattern. I was distracted with the before landing checklist when a TCAS alert warned me of traffic and the pilot not flying called my attention to an oncoming twin engine turboprop on a reciprocal course climbing 200-300 FT above. We proceeded and landed without further incident. Neither myself nor the pilot not flying heard a departure announcement on the CTAF from the turboprop; and we were unaware of its position until the TCAS alert. I had reported my position relative to the field less than a minute prior to the incident.

Data retrieved from NASA's ASRS site as of July 2013 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	1052839
Time
Date	201212
Local Time Of Day	1201-1800
Place
Locale Reference	JYO.Airport
State Reference	VA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	PA-28 Cherokee/Archer/Dakota/Pillan/Warrior
Operating Under FAR Part	Part 91
Flight Phase	Initial Approach
Route In Use	Visual Approach
Flight Plan	None
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Private Flight Crew Instrument
Experience	Flight Crew Last 90 Days 30 Flight Crew Total 200 Flight Crew Type 10
Events
Anomaly	Conflict NMAC
Miss Distance	Horizontal 0 Vertical 300