From FCOMs dated MAY 2024:- NEO: If, during the engine start, the ground crew reports a leak from the engine, abort the engine start sequence. Maintenance action is due before the flight..
- CFM: If, during the engine start, the ground crew reports a fuel leak from the engine drain mast, run the engine at idle for 5 min. If the leak disappears during these 5 min, the aircraft can be dispatched without maintenance action. If the leak is still present after 5 min, shut down the engine and request the maintenance personnel to investigate the leakage source. [DU PRO-NOR-SOP-08-00010162.0060001 / 09 NOV 21]
- IAE: - nil - [DU PRO-NOR-SOP-08-00010162.0056001 / 05 MAY 22]
Our FCOM for the NEO (with Leap engines) still has the advice to idle run 5 min. If the leak disappears, you're good to go without maintenance action. For the IAE engines the same trick has been removed.
This kind of fuel leak was common on the 737 with CFM56-7B and helped us many times dispatch without further ado, never had it on the Airbus (yet).