ACR MLG LNDG UNDERSHOT.

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I FLEW MOST OF THE MONTH WITH THIS PARTICULAR CAPT. HE CONSISTENTLY FLEW A LOWER THAN NORMAL 3 DEG G/S TO THE RWY. AFTER SEVERAL LEGS OF FLYING WITH THIS CAPT; I SIMPLY ACCEPTED THE FACT THAT HE FLEW A LOWER THAN NORMAL APCH (NOT MUCH ELSE I COULD DO). LNDG IN TPA THE CAPT WAS FLYING AND WAS AGAIN LOW ON THE APCH. HE HAD NO PROB WITH HIS PREVIOUS LNDGS AND I FELT THIS WOULD BE NO DIFFERENT AS WITH HIS PREVIOUS LNDGS; UNTIL THE T/D. THE BOTTOM FELL OUT AND WE TOUCHED DOWN ON AN APCH LIGHT. NO ACFT DAMAGE OR PAX INJURIES WERE EXPERIENCED. A DEFINITE CASE OF NON-STANDARD PROC BY THE PIC WHOSE DAY HAD COME. I ALSO SEE A F/O WHO SHOULD HAVE PROTESTED THE LOWER THAN STANDARD APCHS FROM THE BEGINNING. THE F/O IS A SAFETY PLT AND ALL TOO OFTEN MAY ALLOW A CAPT TO PERFORM A NON STANDARD PROC (MANY TIMES THE PERCEPTION MAY BE THAT IT IS THE CAPT'S ACFT). THROUGH FLT DECK MGMNT; INITIAL AND RECURRENT TRNING; THE F/O MUST BE MADE TO REALIZE THE IMPORTANCE OF BRINGING NON STANDARD PROCS TO THE ATTN OF THE CAPT.