B777 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Situational Awareness
Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Took Evasive Action
Airport; Environment - Non Weather Related; Procedure
We departed SBGR on Runway 9L at 682;000 lbs Flaps 1 with a 3 knot headwind. Filed and assigned the BGC2A RNAV departure. SID requires a left turn after 4000 feet; but the terrain is 4718 feet with an obstacle on the mountain top just 5 NM north; along the route of flight. The SID requires a climb of 5% at 1250 fpm at 250 knots. This climb gradient is not possible with a flap retraction at this weight. Also minimum maneuver speed was 248 knots. We HAD to keep Flaps 1 and Minimum Maneuver flaps 1 to ensure terrain clearance with BOTH engines at full climb thrust. We climbed at Flaps 1 at minimum maneuver speed until 1000 feet above the obstacle at 4718 ft. Had ANY problem occurred during this critical phase or had ANY other crew retracted the flaps and/or accelerated; the terrain clearance would be impossible. This SID IS NOT a good idea without some weight adjustments or note to keep flaps 1 until above 5700 feet etc; an engine failure would have been critical and required an IMMEDIATE turn to the south. I suggest a note and/or weight limit be added to this SID to avoid a serious problem. Normal climb procedures with BOTH engines at climb thrust is NOT sufficient to avoid the terrain 5 miles north. Heavy weight and quick turn north not recommended to fly this SID. Put a note in briefing pages to keep flaps 1 and climb first above 5000 feet.
B777 Captain reported that the BGC2A RNAV departure from SGBR may not provide sufficient terrain clearance if the aircraft is heavy and the turn is initiated at 4000 feet.