A UNITED STATES ACR IN FOREIGN AIRSPACE FAILS TO UNDERSTAND THE ICAO RULES OF THE AIR WHEN FLYING IN MEXICO. UNAUTH RWY ENTRY. CLRNC INTERP READBACK IMPROPER.

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THIS RWY INCURSION OCCURRED BECAUSE OF DIFFERENCES IN TERMINOLOGY AND INCOMPLETE COM. WE TAXIED OUT FOR TKOF TO RWY 22 AT PUERTO VALLARTA AND WERE HOLDING SHORT OF THE RWY WAITING FOR A B727 TO LAND. AFTER IT LANDED THE TWR GAVE US THE FOLLOWING INSTRUCTION: 'ACFT X HOLD IN POS RWY 22; ACFT ON 7 MI FINAL.' WE ACKNOWLEDGED 'ACFT X CLRED INTO POS AND HOLD RWY 22.' WE TAXIED INTO POS TO AWAIT TKOF CLRNC AND AS WE WERE SITTING THERE ALREADY STOPPED IN TKOF POS; THE TWR SAID; 'ACFT X YOU WERE TOLD TO HOLD CLR OF THE RWY ACFT IS ON SHORT FINAL; CLRED FOR IMMEDIATE TKOF.' I DON'T KNOW WHAT KIND OF ACFT WAS ON FINAL AS IT WASN'T VISIBLE TO US AS WE TAXIED ONTO THE RWY. IT IS NOT UNUSUAL TO HAVE TO ASK 2 OR 3 TIMES TO REPEAT A CLRNC IN MEXICO BECAUSE OF ACCENT OR SPEECH PATTERNS THAT ARE HARD TO UNDERSTAND; EVEN THOUGH ENGLISH IS SUPPOSEDLY BEING SPOKEN. THIS CLRNC; HOWEVER; SOUNDED CLR TO BOTH OF US AND WAS CONSISTENT WITH THE TYPE OF CLRNC WE'RE USED TO GETTING IN THE UNITED STATES; EXCEPT MODIFIED IN THEIR OWN WAY REGARDING 'HOLD IN POS RWY 22.' IF HE WANTED US TO HOLD OUR POS; I WOULD EXPECT TO HEAR 'HOLD SHORT OF RWY 22.' IN FACT; I DON'T UNDERSTAND WHY HE SAID ANYTHING TO US AT ALL AS WE WERE ALREADY STOPPED IN THE #1 POS AND HAD BEEN FOR SOME TIME. THE TWR CTLR OBVIOUSLY WAS NOT ACCUSTOMED TO USING THE CORRECT TERMINOLOGY SINCE WE READ BACK 'CLRED INTO POS AND HOLD RWY 22' AND HE DIDN'T RESPOND.