A C337 ATP pilot has a problem with his assigned landing runway when another aircraft appears to have taken a position and hold without tower's knowledge at ash, nh.

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Attributes
ACN	530324
Time
Date	200111
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : ash fork.airport
State Reference	NH
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	Skymaster
Operating Under FAR Part	Part 91
Flight Phase	landing : roll
Flight Plan	None
Aircraft 2
Controlling Facilities	tower : ash.tower
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	ground : position and hold
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : atp pilot : multi engine pilot : instrument pilot : commercial
Experience	flight time last 90 days : 15 flight time total : 18000 flight time type : 500
ASRS Report	530324
Person 2
Affiliation	other
Function	flight crew : single pilot
Events
Anomaly	conflict : ground critical incursion : landing without clearance incursion : runway non adherence : clearance non adherence : far non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 0
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I called the tower about 7 mi west of airport (ash). There were numerous aircraft in the vicinity of and on the airport movement areas. I was instructed to enter left downwind and call abeam the tower, which I did. I was then cleared #1 to land. I was also given traffic about 4 mi out and asked to keep it in close or tight. On short final something looked different. As I got lower and closer the runway idents looked different. Closer in, I saw an aircraft in position, I think it was a twin. It had strobes which blended in with the reils. I did not see any red rotating beacon or any position or landing lights on. I then called the tower. He instructed aircraft to hold in position and, I believe, said cleared to land. I then heard tower request aircraft in position to turn on landing light. I landed ok. I believe both tower and ground control were manned by 1 person. At night with heavy student activity, maybe both tower position and ground control position should be manned.

Original NASA ASRS Text

Title: A C337 ATP PLT HAS A PROB WITH HIS ASSIGNED LNDG RWY WHEN ANOTHER ACFT APPEARS TO HAVE TAKEN A POS AND HOLD WITHOUT TWR'S KNOWLEDGE AT ASH, NH.

Narrative: I CALLED THE TWR ABOUT 7 MI W OF ARPT (ASH). THERE WERE NUMEROUS ACFT IN THE VICINITY OF AND ON THE ARPT MOVEMENT AREAS. I WAS INSTRUCTED TO ENTER L DOWNWIND AND CALL ABEAM THE TWR, WHICH I DID. I WAS THEN CLRED #1 TO LAND. I WAS ALSO GIVEN TFC ABOUT 4 MI OUT AND ASKED TO KEEP IT IN CLOSE OR TIGHT. ON SHORT FINAL SOMETHING LOOKED DIFFERENT. AS I GOT LOWER AND CLOSER THE RWY IDENTS LOOKED DIFFERENT. CLOSER IN, I SAW AN ACFT IN POS, I THINK IT WAS A TWIN. IT HAD STROBES WHICH BLENDED IN WITH THE REILS. I DID NOT SEE ANY RED ROTATING BEACON OR ANY POS OR LNDG LIGHTS ON. I THEN CALLED THE TWR. HE INSTRUCTED ACFT TO HOLD IN POS AND, I BELIEVE, SAID CLRED TO LAND. I THEN HEARD TWR REQUEST ACFT IN POS TO TURN ON LNDG LIGHT. I LANDED OK. I BELIEVE BOTH TWR AND GND CTL WERE MANNED BY 1 PERSON. AT NIGHT WITH HVY STUDENT ACTIVITY, MAYBE BOTH TWR POS AND GND CTL POS SHOULD BE MANNED.

Data retrieved from NASA's ASRS site as of July 2007 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.