B777-200
Flight Crew Air Transport Pilot (ATP)
Situational Awareness; Confusion
ATC Issue All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Returned To Clearance; Flight Crew FLC Overrode Automation
Airport; Chart Or Publication; Human Factors; Procedure
Taxi instructions were to back taxi XXR; 180 for takeoff. The taxi chart did not appear to have a turnaround at the end. I did a 180 on the runway and took off. I got the RAAS (Runway Awareness and Advisory System) alert for short runway somewhere near 80 knots. It was a Max Power takeoff. The aircraft was accelerating rapidly; I elected to continue and made a normal takeoff. After climb out I had an uncomfortable feeling about the whole chain of events - short runway; 180 on the runway; and the RAAS alert. As a crew we discussed and took a close look at everything. We noticed on the iPad taxi chart selected to moving map; on the widest scale a turnaround area was depicted. This would have solved the issue. Then we noticed the minimum width for the runway 180 is 157.4 feet. [This runway was only] 148 feet. I also came to the conclusion that while making the 180 I used up runway length.Did not recognize the red flags. Short runway with a back taxi 180 for takeoff. A poor taxi chart depicting the turnaround. When the taxi instructions were issued there were clearly two red flags; short runway back taxi and 180 to take off. At this point I should have reviewed the 180 procedure since it is not a normal operation. That would have clued me that the runway was not wide enough and lead to inquire ATC.
A Boeing 777-200 Captain reported receiving a RAAS (Runway Awareness and Advisory System) alert for short runway takeoff.