Runway incursion when a taxiing LR36 crosses runway 9L without clearance to do so at pbi, fl.

Attributes
ACN	580475
Time
Date	200304
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : pbi.airport
State Reference	FL
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air taxi
Make Model Name	Learjet 36
Operating Under FAR Part	Part 135
Flight Phase	ground : taxi
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : pbi.tower
Operator	general aviation : corporate
Operating Under FAR Part	Part 91
Flight Phase	ground : position and hold
Person 1
Affiliation	company : air taxi
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 100 flight time total : 11000 flight time type : 5000
ASRS Report	580475
Person 2
Affiliation	company : air taxi
Function	flight crew : first officer
Qualification	pilot : cfi pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 115 flight time total : 2000 flight time type : 700
ASRS Report	580793
Events
Anomaly	conflict : ground less severe incursion : runway non adherence : far non adherence : clearance other anomaly other
Independent Detector	other controllera other controllerb
Resolutory Action	controller : issued advisory none taken : anomaly accepted none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	ATC Human Performance Environmental Factor Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

This incident occurred during taxi from FBO to runway 9L at west palm beach, fl. The first taxi instruction from ground control was to 'hold short of runway 9R at taxiway south.' before we got to taxiway south that instruction was changed to 'cross runway 9R.' (I thought I heard: 'cross runway 9R/left and monitor tower') between runway 9L/right on taxiway south I noticed a hawker (I think) pulling onto runway 9L (for takeoff). I was doing the taxi and I asked the first officer: are we cleared to cross? (At this point I meant the left runway and I was certain we were cleared that way). His reply was: 'yes.' we crossed the left runway as the hawker stopped in a normal position and hold fashion. As we switched from ground to tower frequency the tower controller was calling us and seemed to be puzzled as to why we crossed. I don't remember exactly what he said, but the first officer replied without hesitation,

Original NASA ASRS Text

Title: RWY INCURSION WHEN A TAXIING LR36 CROSSES RWY 9L WITHOUT CLRNC TO DO SO AT PBI, FL.

Narrative: THIS INCIDENT OCCURRED DURING TAXI FROM FBO TO RWY 9L AT W PALM BEACH, FL. THE FIRST TAXI INSTRUCTION FROM GND CTL WAS TO 'HOLD SHORT OF RWY 9R AT TXWY S.' BEFORE WE GOT TO TXWY S THAT INSTRUCTION WAS CHANGED TO 'CROSS RWY 9R.' (I THOUGHT I HEARD: 'CROSS RWY 9R/L AND MONITOR TWR') BTWN RWY 9L/R ON TXWY S I NOTICED A HAWKER (I THINK) PULLING ONTO RWY 9L (FOR TKOF). I WAS DOING THE TAXI AND I ASKED THE FO: ARE WE CLRED TO CROSS? (AT THIS POINT I MEANT THE L RWY AND I WAS CERTAIN WE WERE CLRED THAT WAY). HIS REPLY WAS: 'YES.' WE CROSSED THE L RWY AS THE HAWKER STOPPED IN A NORMAL POS AND HOLD FASHION. AS WE SWITCHED FROM GND TO TWR FREQ THE TWR CTLR WAS CALLING US AND SEEMED TO BE PUZZLED AS TO WHY WE CROSSED. I DON'T REMEMBER EXACTLY WHAT HE SAID, BUT THE FO REPLIED WITHOUT HESITATION,

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.