Incident Details
An aircraft was on final approach when the circuit breaker caution light illuminated. The pilot in command (PIC) did not verify which circuit breaker had tripped and assumed it was the gear control circuit breaker. Based on this assumption, the PIC activated the emergency hydraulic system and manually lowered the landing gear.
Landing and Brake Failure
After landing, the hydraulic selector was left in the emergency position. This configuration resulted in the toe brakes having only normal accumulator pressure. The normal accumulator pressure was subsequently depleted, and the aircraft collided with a parked aircraft on the ramp. The PIC did not apply the parking brake despite the parking brake emergency accumulator having sufficient hydraulic pressure.
Circuit Breaker Identification
Investigation revealed that the initially tripped circuit breaker was for the landing gear warning system, not the gear control circuit breaker.