Aircraft had less than standard separation from aircraft Y. System error.

Attributes
ACN	140988
Time
Date	199003
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : mlb
State Reference	FL
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : corporate
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	ground other : taxi
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : takeoff
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial
Experience	flight time last 90 days : 75 flight time total : 1500 flight time type : 300
ASRS Report	140988
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Events
Anomaly	conflict : ground critical incursion : runway non adherence : required legal separation non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	vertical : 100
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Intra Facility Coordination Failure Operational Error

Narrative:

After landing at mlb runway 9R ground control issued instructions, 'taxi cross 4.' the instructions were non standard and incomplete. After arriving at the intersection of runway 4 and the taxiway the ground controller said, 'hold short,' followed by, 'expedite taxi.' meanwhile a twin, aircraft Y, was departing runway 4 (which is a short, normally not used runway, and was not advertised on ATIS as being in use). Between the confusion of being told to hold short then expedite taxi I crossed the hold short line but did not enter the runway.

Original NASA ASRS Text

Title: ACFT HAD LESS THAN STANDARD SEPARATION FROM ACFT Y. SYSTEM ERROR.

Narrative: AFTER LNDG AT MLB RWY 9R GND CTL ISSUED INSTRUCTIONS, 'TAXI CROSS 4.' THE INSTRUCTIONS WERE NON STANDARD AND INCOMPLETE. AFTER ARRIVING AT THE INTXN OF RWY 4 AND THE TXWY THE GND CTLR SAID, 'HOLD SHORT,' FOLLOWED BY, 'EXPEDITE TAXI.' MEANWHILE A TWIN, ACFT Y, WAS DEPARTING RWY 4 (WHICH IS A SHORT, NORMALLY NOT USED RWY, AND WAS NOT ADVERTISED ON ATIS AS BEING IN USE). BTWN THE CONFUSION OF BEING TOLD TO HOLD SHORT THEN EXPEDITE TAXI I CROSSED THE HOLD SHORT LINE BUT DID NOT ENTER THE RWY.

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.