ALT DEV BY FLC OF LGT ON APCH TO NEWBURGH; NY.

Narrative

WE WERE DSNDING TO 6000 FT ON A W HDG. WE WERE EXPECTING THE VOR APCH TO NEWBURGH AND HAD THAT SET UP. WE WERE THEN GIVEN THE ILS APCH AND WE WERE BUSY SETTING THAT UP. I CALLED '7000 FOR 6000'. I WAS TUNING IN THE NDB AND HAVING SOME DIFFICULTY RECEIVING IT. WE HAVE THE OLD STYLE NDB; WHERE YOU HAVE TO TUNE THE STATION IN. IT WAS VERY HAZY; SO I WAS ALSO LOOKING FOR TFC QUITE A BIT. WE HAVE TCASII AND I WAS ALSO LOOKING AT THAT FOR TARGETS. AS PER OUR COMPANY PROCS; WE HAD CONVERTED THE CAPT'S AND FO'S ALTIMETERS OVER SO THAT THEY WOULD READ 0 WHEN WE LANDED. THE CENTER ALTIMETER WAS NOW WHERE WE WOULD PICK UP THE MSL ALT; WHICH IS NOT IN THE NORMAL SCAN OF INSTS. I NOTICED WE WERE 200 FT BELOW OUR ALT. I POINTED TO THE CENTER ALTIMETER AND SAID '6000 FT'. THE CAPT SAID 'OH; 6000 FT'. HE ADDED PWR AND PULLED BACK ON THE YOKE. THE IVSI WAS ON AN UPWARD SWING TOWARDS 0. SINCE WE WERE LOW; I WAS REALLY LOOKING OUT FOR TFC NOW. THE ALT DIPPED A LITTLE LOWER WITH THE DOWNWARD MOMENTUM. THE CAPT ALSO HESITATED A LITTLE BIT AND I CALLED OUT 6000 FT AGAIN AND HE STARTED BACK UP TO 6000 FT. THE CTLR RPTED 'TFC AT 2 O'CLOCK; 3 MI AT 5000 FT'; AND GAVE US A TURN TO 150. HE ASKED US OUR ALT AND WE WERE LEVEL AT 6000 FT BY THIS TIME. WE NEVER GOT TO A 150 HDG BEFORE HE TURNED US BACK TO A 270 HDG. THE OTHER ACFT HAD ALT RPTING CAPABILITY AND WE NEVER RECEIVED A TA ON TCASII. I THINK THE CONTRIBUTING FACTORS WERE: WHEN THE ALT ALERT WENT OFF; IT MAKES THE SAME SOUND IF YOU ARE 200-300 FT OFF YOUR ALT AS IT DOES FOR A WARNING THAT YOU HAVE 700 FT TO GO. I THINK WHEN IT WENT OFF THE CAPT AT FIRST THOUGHT WE HAD 700 FT TO GO. I THINK THERE MAY HAVE ALSO BEEN SOME CONFUSION WITH THE 2 DIFFERENT ALTIMETERS. CONTRIBUTING FACTORS ON MY PART WERE: THE OLD STYLE NDB REQUIRING TOO MUCH ATTN AND TIME SPENT ON IT; THE HAZY CONDITIONS REQUIRING A CONSTANT VIGILANCE FOR TFC; AND HAVING TO PICK UP THE MSL ALT FROM THE CENTER ALTIMETER; OUT OF THE NORMAL SCAN. OTHER CONTRIBUTING FACTORS WERE: NONE OF US HAD BEEN TO NEWBURGH BEFORE AND WE HAD ALSO BEEN ON DUTY FOR 10 HRS AND WE WERE TIRED.