Narrative:

This is an apparent problem with taxiway signage on midland international. I will describe a situation which happens daily at midland. An air carrier mdt calls ready for departure runway 34L. He is holding on taxiway papa. I cleared him for takeoff on 34L. He then pulled ahead and turned left on runway 04 then another left turn on 34L. I informed the pilot that he had pulled onto another runway (see attachment). The extremely potential dangerous situation is: an aircraft pulls out in front of an aircraft on short final to runway 4. After discussions with air carrier pilots, there may be some confusion on the charts (airport diagrams). Specifically mentioned were the commercial charts. I believe the signage needs to be improved on the txwys and/or runways. Aircraft taxiing south on taxiway papa should have better guidance signs to the approach end of 34L. The aircraft are using the red route on the attached diagram. Before I could finish this report, I worked local control again on thu. In less than 1 hour I had the same situation happen twice more. At XA37Z, MTR a taxied onto runway 4 then departed runway 34L. At XB25Z, MTR B repeated the same actions.

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Original NASA ASRS Text

Title: WHEN IMPROVISING A TAXI RTE IN ORDER TO USE THE STOPWAY FOR RWY 16R WHEN TAKING OFF ON RWY 34L, ACFT ARE TAXIING ONTO RWY 4 WITHOUT CLRNC.

Narrative: THIS IS AN APPARENT PROB WITH TXWY SIGNAGE ON MIDLAND INTL. I WILL DESCRIBE A SIT WHICH HAPPENS DAILY AT MIDLAND. AN ACR MDT CALLS READY FOR DEP RWY 34L. HE IS HOLDING ON TXWY PAPA. I CLRED HIM FOR TKOF ON 34L. HE THEN PULLED AHEAD AND TURNED L ON RWY 04 THEN ANOTHER L TURN ON 34L. I INFORMED THE PLT THAT HE HAD PULLED ONTO ANOTHER RWY (SEE ATTACHMENT). THE EXTREMELY POTENTIAL DANGEROUS SIT IS: AN ACFT PULLS OUT IN FRONT OF AN ACFT ON SHORT FINAL TO RWY 4. AFTER DISCUSSIONS WITH ACR PLTS, THERE MAY BE SOME CONFUSION ON THE CHARTS (ARPT DIAGRAMS). SPECIFICALLY MENTIONED WERE THE COMMERCIAL CHARTS. I BELIEVE THE SIGNAGE NEEDS TO BE IMPROVED ON THE TXWYS AND/OR RWYS. ACFT TAXIING S ON TXWY PAPA SHOULD HAVE BETTER GUIDANCE SIGNS TO THE APCH END OF 34L. THE ACFT ARE USING THE RED RTE ON THE ATTACHED DIAGRAM. BEFORE I COULD FINISH THIS RPT, I WORKED LCL CTL AGAIN ON THU. IN LESS THAN 1 HR I HAD THE SAME SIT HAPPEN TWICE MORE. AT XA37Z, MTR A TAXIED ONTO RWY 4 THEN DEPARTED RWY 34L. AT XB25Z, MTR B REPEATED THE SAME ACTIONS.

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.