An mu-2 atx pilot obtained tower taxi instructions via an assigned route to runway 27L. Approaching runway 27L, the pilot requested departure on runway 32, and failed to obtain tower authority/authorized prior to taxiing onto runway 27L as a BE18 was commencing takeoff.

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Attributes
ACN	385570
Time
Date	199711
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : yip
State Reference	MI
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air taxi
Make Model Name	MU-2
Operating Under FAR Part	Part 135
Flight Phase	ground other : taxi other
Flight Plan	None
Aircraft 2
Operator	common carrier : air taxi
Make Model Name	Twin Beech 18
Operating Under FAR Part	Part 135
Flight Phase	climbout : takeoff
Route In Use	departure other
Person 1
Affiliation	company : air taxi
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 200 flight time total : 30000 flight time type : 300
ASRS Report	385570
Person 2
Affiliation	company : air taxi
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : ground less severe incursion : runway non adherence : required legal separation non adherence : clearance other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Cleared to taxi from flying service ramp to runway 27L via taxiway D. As I approached intersection of runway 27L and taxiway D, I asked tower for departure on runway 32. I was then cleared (I thought) to runway 32. As I taxied onto runway 27L I noticed an airplane departing on runway 27L. I immediately cleared the runway.

Original NASA ASRS Text

Title: AN MU-2 ATX PLT OBTAINED TWR TAXI INSTRUCTIONS VIA AN ASSIGNED RTE TO RWY 27L. APCHING RWY 27L, THE PLT REQUESTED DEP ON RWY 32, AND FAILED TO OBTAIN TWR AUTH PRIOR TO TAXIING ONTO RWY 27L AS A BE18 WAS COMMENCING TKOF.

Narrative: CLRED TO TAXI FROM FLYING SVC RAMP TO RWY 27L VIA TXWY D. AS I APCHED INTXN OF RWY 27L AND TXWY D, I ASKED TWR FOR DEP ON RWY 32. I WAS THEN CLRED (I THOUGHT) TO RWY 32. AS I TAXIED ONTO RWY 27L I NOTICED AN AIRPLANE DEPARTING ON RWY 27L. I IMMEDIATELY CLRED 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.