A B767 ON A NIGHT VFR APCH DSNDED LOW ENOUGH TO ACTIVATE THE EGPWS FOLLOWED BY AN ATC LOW ALT ALERT.

Narrative

DURING A VISUAL APCH (GOOD VMC); FROM A R DOWNWIND AT ZZZ; THE PF BEGAN A BASE LEG AT APPROX 5-6 MI FROM RWY THRESHOLD. DURING TURN TO BASE LEG; ACFT DSNDED TO APPROX 700-1000 FT AGL. ATC NOTIFIED US OF A LOW ALT ALERT. ACFT WAS LEVELED OFF AND GLIDE PATH REESTABLISHED. SHORTLY AFTER ATC'S NOTIFICATION; EGPWS GAVE US AN OBSTACLE CAUTION ALERT. ONCE ESTABLISHED ON GLIDE PATH THE LNDG WAS UNEVENTFUL. SEVERAL FACTORS CONTRIBUTED TO THIS EVENT. 1) NO PUBLISHED APCH TO RWY XX AT ZZZ (GPS RWY XX IS AVAILABLE; BUT B757/767 FLEET NOT AUTH). 2) VASI WAS NOTAM'ED OTS. 3) R DOWNWIND ENTRY WITH CAPT AS PF. 4) OVER-RELIANCE ON AUTOMATION -- CREW PROGRAMMED A RWY EXTENSION AND BUILT A 3 DEG PATH -- THIS IS A RARELY USED FEATURE. ONCE THE BASE LEG WAS INITIATED; PF REQUESTED THE RWY TO BE EXTENDED; PM COMPLIED -- THIS REMOVED THE CORRECT PATH INFO. 5) CUMULATIVE EFFECTS OF FATIGUE; 4TH NIGHT OF BACKSIDE OF THE CLOCK FLYING WITH SOME SLEEP DEBT DUE TO POOR QUALITY OF REST ON 2 OF THE 4 NIGHTS. 6) PM SHOULD HAVE BEEN MORE ASSERTIVE AS SIT BEGAN TO UNFOLD; SOMEWHAT RELUCTANT DUE TO INITIAL CREW PAIRING; VERY GOOD VMC; ETC.