From Halopedia, the Halo wiki
A Class-L flash-dock is a type of maneuver used for the purpose of docking human spacecraft on a planetary surface when speed is of the essence. It is typically performed by small spacecraft such as corvettes and frigates, and is a restricted maneuver for ships on the scale of a Halcyon-class light cruiser.
During the Fall of Reach in 2552, the UNSC Pillar of Autumn was fitted with R7 thrust couplings so it could perform a flash-dock, successfully berthing at the Asźod ship breaking yards, despite the danger and difficulty of landing a ship of that size, in order to receive a critical asset for Operation: RED FLAG before returning to space.
List of appearances