Light transport taxied onto restricted taxiway.

Attributes
ACN	91890
Time
Date	198808
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : det
State Reference	MI
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : commercial pilot : instrument pilot : atp
Experience	flight time last 90 days : 170 flight time total : 3500 flight time type : 1500
ASRS Report	91890
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	non adherence : published procedure
Independent Detector	other controllera other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation
Situations
Airport	procedure or policy : unspecified

Narrative:

The full length of runway 15 is not usable for all aircraft. This is designated by an ambiguous sign, 'southwest only.' this means that xyz airline only is allowed to taxi on taxiway a north of C. The sign should be more clear. This taxi limit should be notamed on ATIS.

Original NASA ASRS Text

Title: LTT TAXIED ONTO RESTRICTED TXWY.

Narrative: THE FULL LENGTH OF RWY 15 IS NOT USABLE FOR ALL ACFT. THIS IS DESIGNATED BY AN AMBIGUOUS SIGN, 'SW ONLY.' THIS MEANS THAT XYZ AIRLINE ONLY IS ALLOWED TO TAXI ON TXWY A N OF C. THE SIGN SHOULD BE MORE CLEAR. THIS TAXI LIMIT SHOULD BE NOTAMED ON ATIS.

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.