FLT INSTRUCTOR DOES TOUCH-AND-GO ON CLOSED RWY AFTER A SHORT STEEP APCH OVER TAXIING ACFT.

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WRITER MET STUDENT AT YIP; HAD A WX BRIEFING; PREFLTED AND BOARDED ACFT. WRITER OBTAINED ATIS; WAS ADVISED RWY 23L AND RWY 27L CLOSED. WRITER OBTAINED CLRNC TO TKOF RWY 23R; AND FLY L TFC. ATC CLRED WRITER TO OPTION TOUCH-AND-GO OR LAND RWY 23R. ATC ADVISED WRITER 'MAKE SHORT APCH.' WRITER DIRECTED STUDENT TO TOUCH-AND-GO RWY 23L; PASSING OVER HVY ACFT #2 TAXIING WBOUND ON RWY 27R AT LEAD END OF RWY 23L. WRITER NOT AWARE OF MEN AND EQUIP ON RWY 23L UNTIL AFTER LNDG. MEN AND EQUIP WERE AT FAR END OF RWY; OVER 1 MI BEYOND LNDG POINT. NO EVASIVE ACTION WAS NEEDED TO SAFELY PASS OVER ACFT #2. ACFT #2 COMMENTED TO TWR THAT WRITER 'ALMOST HIT HIM.' POSSIBLY BECAUSE PLT OF ACFT #2 IMAGINED 3 DEG GS WHEN WRITER WAS ACTUALLY ON ABOUT A 25 DEG GS (90 HARD FULL FLAP SLIP). PROB AROSE BECAUSE 1) WRITER; FLYING L TFC; WAS USED TO LNDG L-HAND RWY; AND IN FACT HAD USED RWY 23L THE AFTERNOON OF THE DAY PRIOR. 2) THE LNDG ON RWY 23L HAPPENED IN FIRST CIRCUIT OF PATTERN. 3) BECAUSE THERE WAS NO 'X' AT BEGINNING OF RWY. MEN AND EQUIP WERE AT FAR END OF RWY AND NOT EASILY SEEN. THE RWY WAS 7518 FT LONG AND NO EVIDENCE OF A CLOSED RWY; THE WRITER FORGOT THE RWY WAS CLOSED; SAW NO EVIDENCE OF A CLOSED RWY. HAD A CLRNC OPTION TOUCH-AND-GO OR LAND; SAW A CLR RWY TO LAND. MISTAKE NOT DISCOVERED UNTIL TOUCH-AND-GO ROLL; WRITER SAW THE MEN AND EQUIP AT FAR END. WRITER'S ACFT WAS ONLY ACFT IN PATTERN. CONTRIBUTING FACTORS: 1) FLYING L TFC ON PARALLEL RWYS BIASED WRITER TO INADVERTENTLY CHOOSE RWY 23L EVEN THOUGH CLRED FOR RWY 23R. 2) ABSENCE OF 'X' INDICATING CLOSED RWY AND ABSENCE OF ANY OBSTACLES OR EVIDENCE OF RWY CLOSING IN FIRST 6500 FT OF RWY GAVE WRITER NO INDICATION HE WAS MAKING A MISTAKE. 3) 160 FT WIDE RWY AND 7518 FT LONG RWY WOULD MAKE MEN AND VEHICLES VERY DIFFICULT TO SEE FROM APCH END; GIVEN THE FACT THERE WAS SOME HAZE AND THE FACT THAT THE VEHICLES WERE PARKED AT THE EDGE OF THE RWY. HUMAN PERFORMANCE NEGATIVE: 1) WRITER JUST STARTED INSTRUCTIONS. 2) FIRST DAY RWY CLOSED. 3) VERY HOT DAY.