Flight Crew Air Transport Pilot (ATP)
Situational Awareness
Deviation - Altitude Crossing Restriction Not Met; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter CFTT / CFIT
Flight Crew Diverted; Flight Crew Executed Go Around / Missed Approach; Flight Crew FLC complied w / Automation / Advisory
Chart Or Publication; Human Factors
While flying the RNAV (GPS) Runway 8 at 3R7; we received a GPWS obstacle warning at approximately 600 FT. We executed a go-around and missed approach. Weather was right at minimums; so I was planning to get down to MDA ahead of vertical glidepath. Failed to notice the 720 FT crossing restriction at WEBAC; so if we had continued down to 500 FT; we would only have had a 152 FT clearance near a Tower located 3 miles from the runway. We shot another approach; but the weather prevented a landing. We diverted to our alternate. Autopilot was on; with vertical speed mode engaged when the event happened.To prevent this in the future I will plan a more careful review of the approach plate and will fly close to the generated VGP rather than using the 'dive and drive' technique.
With full automation engaged; we briefed and used Vertical Speed to 'dive and drive' down to the MDA of 465 FT. As we were leveling off at MDA we got an EGPWS 'caution obstacle' warning. The EGPWS didn't 'know' that we were leveling off; so it gave us the alert. We did get below the WEBAK altitude of 720 FT just prior to the fix by about 60-70 FT. A more thorough review of the approach chart [would have been advisable and we shouldn't have used the 'dive and drive' technique to get down to MDA.
When the two Captains of a Falcon failed to note the 720 MSL crossing restriction at WEBAC while conducting the RNAV (GPS) Runway 8 approach to 3R7 they descended too quickly and triggered an EGPWS warning. The performed a MAP and diverted to their alternate airport.