Narrative:

After computing a T/D speed (threshold speed) on the retired MTR of 145 K, turned final at 145 K plus 20 K (normal procedure) but xed threshold approximately 25' too high (75' AGL) and was still going 150 K approximately at that time. Floated further down runway after reducing to idle power smooth T/D but 2000-2500' down runway of 7100' length delayed braking to allow wheel spin up for antiskid operation. Began normal brake application. Had slight right crosswind of only 8 KTS, and when slight 'wing rock' started, released brakes, then reapplied brakes. I computed my landing weight as maximum of approximately 8000-8100 pounds. (Prior to approach). Runway had downhill gradient and deceleration was noticed to be very slow, went to maximum braking, noticed anti-skid cycle and aircraft slowed to a speed slightly above taxi speed. I realized that I was not going to be able to turn off at the last taxiway exit, still applying full braking, and steered to the left of center to miss the approach light stands and rolled to a stop 75-85' into the hardpack, grass covered surface off the end of the runway. Reported off runway to tower, shutdown and evacuated aircraft. There was no apparent damage to the aircraft, airport structures or personnel. I landed 'long and hot' and heavy. Should have gone around. I have been flying the MTR for 1 1/2 yrs over estimated its stopping ability at maximum landing weight.

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Original NASA ASRS Text

Title: PLT OF RETIRED MTR LANDS LONG AND HOT WHILE DOING SOME PRACTICE AT ADS; RUNS OFF RWY WITH NO DAMAGE.

Narrative: AFTER COMPUTING A T/D SPD (THRESHOLD SPD) ON THE RETIRED MTR OF 145 K, TURNED FINAL AT 145 K PLUS 20 K (NORMAL PROC) BUT XED THRESHOLD APPROX 25' TOO HIGH (75' AGL) AND WAS STILL GOING 150 K APPROX AT THAT TIME. FLOATED FURTHER DOWN RWY AFTER REDUCING TO IDLE PWR SMOOTH T/D BUT 2000-2500' DOWN RWY OF 7100' LENGTH DELAYED BRAKING TO ALLOW WHEEL SPIN UP FOR ANTISKID OPERATION. BEGAN NORMAL BRAKE APPLICATION. HAD SLIGHT R XWIND OF ONLY 8 KTS, AND WHEN SLIGHT 'WING ROCK' STARTED, RELEASED BRAKES, THEN REAPPLIED BRAKES. I COMPUTED MY LNDG WT AS MAX OF APPROX 8000-8100 LBS. (PRIOR TO APCH). RWY HAD DOWNHILL GRADIENT AND DECELERATION WAS NOTICED TO BE VERY SLOW, WENT TO MAX BRAKING, NOTICED ANTI-SKID CYCLE AND ACFT SLOWED TO A SPD SLIGHTLY ABOVE TAXI SPD. I REALIZED THAT I WAS NOT GOING TO BE ABLE TO TURN OFF AT THE LAST TXWY EXIT, STILL APPLYING FULL BRAKING, AND STEERED TO THE L OF CTR TO MISS THE APCH LIGHT STANDS AND ROLLED TO A STOP 75-85' INTO THE HARDPACK, GRASS COVERED SURFACE OFF THE END OF THE RWY. RPTED OFF RWY TO TWR, SHUTDOWN AND EVACUATED ACFT. THERE WAS NO APPARENT DAMAGE TO THE ACFT, ARPT STRUCTURES OR PERSONNEL. I LANDED 'LONG AND HOT' AND HVY. SHOULD HAVE GONE AROUND. I HAVE BEEN FLYING THE MTR FOR 1 1/2 YRS OVER ESTIMATED ITS STOPPING ABILITY AT MAX LNDG WT.

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.