Medium Large Transport
Flight Crew Air Transport Pilot (ATP)
Confusion; Other / Unknown
Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Object
Flight Crew Requested ATC Assistance / Clarification; General Flight Cancelled / Delayed
ATC Equipment / Nav Facility / Buildings; Environment - Non Weather Related
Pushed A1 at KBOS; cleared 'Spot 7.' At 'Spot 7' (facing south) set brakes to await taxi instructions. After taxi instructions received and route briefed released brake for taxi. Pushed power up on #1 engine (single engine taxi) to make way. Aircraft would not move. Increased power to try and break free. Unable to move. I do not remember exact power setting; but should have been ample to break free. Baffled; verified brake was off; it was... pushed power up again yet could get no forward momentum. Boston called 'Aircraft X; you unable to move?' We responded 'now that you ask; that's affirmative' Boston came back 'divot at spot 7; you're not the first.'  We asked if anyone was behind us and area clear and BOS confirmed clear. We pushed the power up further on #1. Unable to break free. I wasn't comfortable with the situation; so had the FO Start #2. Even with both turning; it took a lot of power to break free. My concern is for others out there that could experience the same in the future; and power settings that could be a safety hazard in such a busy area. Since the flight; I relayed my experience to another pilot who had experienced the same...so I thought it might be a good to forward along.
The aircraft could not taxi from 'Spot 7' at BOS without starting the second engine and applying excessive power (after clearing area behind them). BOS ground informed the crew that there is a 'Divot at spot 7; you're not the first.'