Fault Phenomenon: Haulotte HA14LE articulating boom aerial work platform seatbelt buckle cannot latch or unlatch.

Troubleshooting Process:
– Checked mechanical: mechanically seized.
– Checked webbing: webbing broken.
– Checked latch: latch damaged.
– Checked for foreign objects: debris.

Root Cause: The seatbelt buckle mechanism is mechanically damaged.

Required Parts: Seatbelt assembly.