SMT TURBOPROP LANDS SHORT OF RWY.

Narrative

ON AUG/XX/92 I WAS A PAX IN AN SMT TWIN FROM SPIRIT OF ST LOUIS ARPT TO GRAND GLAIZE ARPT. THE PLT WAS MY BUSINESS ASSOCIATE; MR Y. MR Y AND I ARE BOTH PRIVATE PLTS QUALIFIED TO FLY THE ACFT AND SOMETIMES Y FLIES AND SOMETIMES I FLY; BUT WHOEVER FLIES DOES ALL THEIR OWN FLYING INCLUDING TALKING ON THE RADIO. ON THIS PARTICULAR FLT; I WAS A PAX IN THE REAR OF THE ACFT AND A PAX; A NON-PLT; RODE IN THE R FRONT SEAT. AS WE APCHED GRAND GLAIZE ARPT I NOTICED THAT WE WERE ON TOP OF AN OVCST AND HEARD ZKC RPT THAT AN ACFT HAD EARLIER SHOT A MISSED APCH AND LANDED AT LEE C FINE ARPT. I ASKED MR Y FROM THE BACK OF THE ACFT IF HE WOULD LIKE SOME HELP LOOKING FOR THE ARPT; I.E.; ANOTHER PAIR OF EYES FOR THE APCH. HE DID NOT HEAR ME AND I THEN TAPPED PAX ON THE SHOULDER AND INDICATED THAT I WANTED TO CHANGE SEATS SO THAT I COULD SIT UP FRONT AND HELP LOCATE THE ARPT WHEN WE BROKE OUT ON THE APCH. MR Y MADE A VERY FINE APCH AND WE BROKE OUT VFR WITH GOOD VISIBILITY AT ABOUT 1700 FT AND COULD SEE THE RWY. I SAID 'GOOD APCH.' MR Y WAS FLYING THE ACFT AS A SINGLE PLT; CANCELLED HIS IFR CLRNC AND THE AIRPLANE WAS HIS TO MAKE THE LNDG. WE HAVE EACH LANDED AT THAT ARPT AT MANY TIMES OVER THE YEARS AND BECAUSE IT IS A SHORT FIELD; ALWAYS USED FULL FLAPS. AS A COURTESY TO MR Y; I LOWERED THE FLAPS FROM 15 DEGS TO 30 DEGS. WHEN WE WERE ABOUT 200 YARDS FROM FINAL TOUCHDOWN I ADVISED MR Y THAT I WAS GIVING HIM FULL FLAPS. MR Y KNEW I PUT THE FLAPS DOWN AND WAS IN NO WAY SURPRISED. EVERYTHING APPEARED NORMAL. I WAS VERY SURPRISED WHEN MR Y LANDED A FT OR 2 SHORT OF THE RWY. THE ONLY EXPLANATION I HAVE FOR IT IS EITHER A WIND SHIFT OR DOWN DRAFT; OR A MISJUDGEMENT BY MR Y BECAUSE OF THE FACT THAT THERE WAS MORE WEIGHT IN THE BACK OF THE ACFT ON THIS TRIP THAN NORMAL. MR Y LATER TOLD ME THAT HE WAS CARRYING 100 KTS AIRSPD ON SHORT FINAL WHICH SHOULD HAVE BEEN ENOUGH TO PROPERLY FLARE THE ACFT. WHATEVER THE CAUSE; I AM ABSOLUTELY POSITIVE THAT LNDG WITH FULL FLAPS WAS NOT THE CAUSE OR DID NOT CONTRIBUTE IN ANY MANNER TO THIS INCIDENT. I RECENTLY TOOK MY BIENNIAL CHKRIDE IN THIS ACFT; I FEEL VERY COMFORTABLE FLYING IT AND AM VERY SORRY ABOUT THIS INCIDENT; BUT DO NOT FEEL THAT I WAS IN ANY MANNER ACTING AS EITHER A PLT OR COPLT AT THE TIME OF THIS LNDG. MY ONLY PURPOSE IN BEING IN THE R FRONT SEAT WAS TO HELP LOOK FOR THE ARPT WHICH WAS NOT A PROBLEM.