SMA BACK TAXIES ONTO DISPLACED THRESHOLD AND DEPARTS.

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JABARA ARPT IS UNDER CONSTRUCTION FOR RWY LENGTH. BECAUSE OF THE CONSTRUCTION; ALL BUT 2 OF THE TAXIWAYS LEADING UP TO THE RWY WERE CLOSED. I HAVE BEEN INSTRUCTING/FLYING OUT OF JABARA FOR YRS. LCL NOTAMS DEFINE A DISPLACED THRESHOLD DUE TO RWY LENGTH. I DID NOT CHK NOTAMS ON DATE OF SUBJECT FLT. UPON TAXIING OUT; I DID NOT REALIZE ALL BUT 2 OF THE TAXIWAYS WERE CLOSED. MY STUDENT REQUESTED AND RECEIVED ADVISORY INFO FROM UNICOM. A MOMENT LATER; UNICOM INFORMED US WE WOULD HAVE TO TAXI TO THE END AND BACK TAXI DUE TO TAXIWAYS BEING CLOSED. AFTER A SHORT DELAY FOR LNDG TFC WE BACK TAXIED; PAST THE DISPLACED THRESHOLD. WE THEN TURNED INTO THE WIND 180 DEGS FOR RUNUP; APPROX 500 FT FROM THE END OF THE RWY. ALL THE WHILE THE CONSTRUCTION CREWS AND EQUIP WERE PROCEEDING WHAT APPEARED TO BE NORMALLY. A SHORT FIELD TKOF ENSUED WITHOUT INCIDENT. TODAY; OCT/XX/92; I RETURN A CALL TO MS. X AT 3 KM WHO SAID THEY WERE VERY UPSET THAT WE DID NOT ASK FOR PERMISSION TO TAXI/TKOF BEHIND THE DISPLACED THRESHOLD. BEING BY DEFINITION A DISPLACED THRESHOLD; I DID NOT REQUEST PERMISSION TO BACK TAXI AND TKOF BEHIND THE DISPLACED THRESHOLD. THE WICHITA ARPT AUTHORITY; WHO SUGGESTED JABARA CONTACT ME; IS APPARENTLY FURIOUS THAT SOMEONE DID NOT COMPLY WITH THE LCL NOTAM TO REQUEST FULL RWY LENGTH 30 MINS PRIOR. LESSON LEARNED: CHK NOTAMS EACH DAY; EVEN FOR LCL TRAINING FLTS. LCL NOTAMS; CLASS D; FSS (ICT) DO NOT HAVE ANY DATA REQUIRING A PLT TO GIVE PRIOR NOTICE TO USE RWY BEHIND DISPLACED THRESHOLD.