A lear 35 flight crew on app to fdk executed a go-around when a C172 taxied onto the runway.

Attributes
ACN	789305
Time
Date	200806
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : fdk.airport
State Reference	MD
Altitude	agl single value : 200
Environment
Flight Conditions	Marginal
Weather Elements	Rain
Light	Daylight
Aircraft 1
Operator	general aviation : corporate
Make Model Name	Learjet 35
Operating Under FAR Part	Part 91
Navigation In Use	ils localizer & glide slope : 23
Flight Phase	landing : go around
Route In Use	approach : visual
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	ground : takeoff roll
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : cfi pilot : atp
Experience	flight time last 90 days : 40 flight time total : 3100 flight time type : 500
ASRS Report	789305
Events
Anomaly	conflict : ground less severe incursion : runway non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	flight crew : executed go around
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

While on an IFR flight plan; we were being vectored to join the ILS 23 at fdk. We saw the airport and called it in sight. Potomac approach cleared us for the visual runway 23 at fdk. We self-vectored to localizer intercept and were following the GS to the runway. We made radio calls on CTAF at 7 mi; and 2 mi. I noticed a C172 holding short of runway 23 for departure. I had a bad feeling so I told the first officer to call short final runway 23; and he did stating that we were 1/2 mi final. Once he completed his radio call; I told him I didn't think this guy was going to hold short and to stand by to go around. The C172 proceeded to take the runway; and I commanded; 'go around.' we completed the go around memory items and after takeoff checks; and stayed left closed traffic to come around and land again. While we were on the downwind; the cessna called left crosswind. I queried the pilot and he said I heard your calls; but I didn't see you so we taxied onto the runway. We flew the traffic pattern and landed without further incident.

Original NASA ASRS Text

Title: A LEAR 35 FLT CREW ON APP TO FDK EXECUTED A GO-AROUND WHEN A C172 TAXIED ONTO THE RUNWAY.

Narrative: WHILE ON AN IFR FLT PLAN; WE WERE BEING VECTORED TO JOIN THE ILS 23 AT FDK. WE SAW THE ARPT AND CALLED IT IN SIGHT. POTOMAC APCH CLRED US FOR THE VISUAL RWY 23 AT FDK. WE SELF-VECTORED TO LOC INTERCEPT AND WERE FOLLOWING THE GS TO THE RWY. WE MADE RADIO CALLS ON CTAF AT 7 MI; AND 2 MI. I NOTICED A C172 HOLDING SHORT OF RWY 23 FOR DEP. I HAD A BAD FEELING SO I TOLD THE FO TO CALL SHORT FINAL RWY 23; AND HE DID STATING THAT WE WERE 1/2 MI FINAL. ONCE HE COMPLETED HIS RADIO CALL; I TOLD HIM I DIDN'T THINK THIS GUY WAS GOING TO HOLD SHORT AND TO STAND BY TO GO AROUND. THE C172 PROCEEDED TO TAKE THE RWY; AND I COMMANDED; 'GO AROUND.' WE COMPLETED THE GAR MEMORY ITEMS AND AFTER TKOF CHKS; AND STAYED L CLOSED TFC TO COME AROUND AND LAND AGAIN. WHILE WE WERE ON THE DOWNWIND; THE CESSNA CALLED L XWIND. I QUERIED THE PLT AND HE SAID I HEARD YOUR CALLS; BUT I DIDN'T SEE YOU SO WE TAXIED ONTO THE RWY. WE FLEW THE TFC PATTERN AND LANDED WITHOUT FURTHER INCIDENT.

Data retrieved from NASA's ASRS site as of May 2009 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.