Potential conflict ground after unauthorized runway entry by C-152.

Attributes
ACN	300545
Time
Date	199503
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : apa
State Reference	CO
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Cessna 152
Operating Under FAR Part	Part 91
Flight Phase	ground : holding
Flight Plan	None
Aircraft 2
Operator	other
Make Model Name	King Air C90 E90
Operating Under FAR Part	Part 91
Flight Phase	other
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : commercial
Experience	flight time last 90 days : 25 flight time total : 306 flight time type : 16
ASRS Report	300545
Person 2
Affiliation	government : faa
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : ground critical incursion : runway non adherence : clearance non adherence : far
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : exited adverse environment flight crew : became reoriented other
Consequence	faa : reviewed incident with flight crew
Miss Distance	vertical : 300
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

After completion of runup checklist, myself and 1 other c- 152 converged upon hold line at runway 17L. I arrived at hold line before other C-152. That pilot advised 'ready to go, runway 17L, southeast departure.' I called in right after explaining I was #1 at hold line, southeast departure as well.' response was, 'roger, position and hold' without actually saying my call sign (tail number). I verified, 'position and hold' without actually saying my numbers as well. I pulled out onto the centerline to see an airborne king air (FAA ILS check plane) approaching me from opposing end of runway at a high closure rate. Tower controller became anxious and stated for unauthorized aircraft to remove themselves from active immediately. I was already moving off of active (expeditiously). Controller said 'hold short' instead of 'position and hold.' I heard 'position and hold' and even read back instruction. I later explained to tower manager (after being instructed to contact tower) that this was a miscom and a first for me. Together, we came to a solution that any time there is the slightest chance for miscom to always verify to whom it was directed and mention call signs with every readback instead of relying upon voice identify.

Original NASA ASRS Text

Title: POTENTIAL CONFLICT GND AFTER UNAUTH RWY ENTRY BY C-152.

Narrative: AFTER COMPLETION OF RUNUP CHKLIST, MYSELF AND 1 OTHER C- 152 CONVERGED UPON HOLD LINE AT RWY 17L. I ARRIVED AT HOLD LINE BEFORE OTHER C-152. THAT PLT ADVISED 'READY TO GO, RWY 17L, SE DEP.' I CALLED IN RIGHT AFTER EXPLAINING I WAS #1 AT HOLD LINE, SE DEP AS WELL.' RESPONSE WAS, 'ROGER, POS AND HOLD' WITHOUT ACTUALLY SAYING MY CALL SIGN (TAIL NUMBER). I VERIFIED, 'POS AND HOLD' WITHOUT ACTUALLY SAYING MY NUMBERS AS WELL. I PULLED OUT ONTO THE CTRLINE TO SEE AN AIRBORNE KING AIR (FAA ILS CHK PLANE) APCHING ME FROM OPPOSING END OF RWY AT A HIGH CLOSURE RATE. TWR CTLR BECAME ANXIOUS AND STATED FOR UNAUTH ACFT TO REMOVE THEMSELVES FROM ACTIVE IMMEDIATELY. I WAS ALREADY MOVING OFF OF ACTIVE (EXPEDITIOUSLY). CTLR SAID 'HOLD SHORT' INSTEAD OF 'POS AND HOLD.' I HEARD 'POS AND HOLD' AND EVEN READ BACK INSTRUCTION. I LATER EXPLAINED TO TWR MGR (AFTER BEING INSTRUCTED TO CONTACT TWR) THAT THIS WAS A MISCOM AND A FIRST FOR ME. TOGETHER, WE CAME TO A SOLUTION THAT ANY TIME THERE IS THE SLIGHTEST CHANCE FOR MISCOM TO ALWAYS VERIFY TO WHOM IT WAS DIRECTED AND MENTION CALL SIGNS WITH EVERY READBACK INSTEAD OF RELYING UPON VOICE IDENT.

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.