Mechanic taxied aircraft across an active runway without clearance.

Attributes
ACN	94821
Time
Date	198809
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : pdx
State Reference	OR
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Transport
Flight Phase	ground other : taxi
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
ASRS Report	94821
Person 2
Affiliation	government : faa
Function	controller : ground
Qualification	controller : non radar
Events
Anomaly	incursion : runway non adherence : clearance
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

After performance of propeller installation ground run on taxiway 'G' contacted pdx tower for permission to return to maintenance hangar which involved crossing runway 2/20. Pdx tower radioed turn 180 degree and cross runway 20, return to maintenance base.' operator responded with call sign and turned 180 degree and proceeded to cross runway. After crossing, pdx tower contacted aircraft and asked what instructions were given, which was repeated back to the tower. Tower informed mechanic (aircraft operator) that the instructions were 'turn 180 degree and hold at runway 2/20.' he also instructed to 'be alert and use caution in controled areas.' radio communication was clear with no interference, and no distrs were present. Airman misheard tower instructions and failed to repeat back instructions which would have clarified the instructions.

Original NASA ASRS Text

Title: MECHANIC TAXIED ACFT ACROSS AN ACTIVE RWY WITHOUT CLRNC.

Narrative: AFTER PERFORMANCE OF PROP INSTALLATION GND RUN ON TXWY 'G' CONTACTED PDX TWR FOR PERMISSION TO RETURN TO MAINT HANGAR WHICH INVOLVED XING RWY 2/20. PDX TWR RADIOED TURN 180 DEG AND CROSS RWY 20, RETURN TO MAINT BASE.' OPERATOR RESPONDED WITH CALL SIGN AND TURNED 180 DEG AND PROCEEDED TO CROSS RWY. AFTER XING, PDX TWR CONTACTED ACFT AND ASKED WHAT INSTRUCTIONS WERE GIVEN, WHICH WAS REPEATED BACK TO THE TWR. TWR INFORMED MECH (ACFT OPERATOR) THAT THE INSTRUCTIONS WERE 'TURN 180 DEG AND HOLD AT RWY 2/20.' HE ALSO INSTRUCTED TO 'BE ALERT AND USE CAUTION IN CTLED AREAS.' RADIO COM WAS CLR WITH NO INTERFERENCE, AND NO DISTRS WERE PRESENT. AIRMAN MISHEARD TWR INSTRUCTIONS AND FAILED TO REPEAT BACK INSTRUCTIONS WHICH WOULD HAVE CLARIFIED THE INSTRUCTIONS.

Data retrieved from NASA's ASRS site as of August 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.