Cessna 402/402C/B379 Businessliner/Utiliner
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Loss Of Aircraft Control
Flight Crew Regained Aircraft Control
Aircraft
Final on RWY 27 ZZZ. Select 10 degrees flaps for In Range Flow. Nothing happens. Before landing flow with gear down slowed into white arc; still no drag or increased lift felt. Selected full flaps approx. 300' AGL; flaps seem to begin working. I hear a loud pop on the left side and plane banks hard to the right as well. I maintain directional control; retract flaps and land with 0 flaps without issue.
C402 pilot reported a flap malfunction during approach to land.