Bonanza 33
Flight Crew Instrument; Flight Crew Private
Flight Crew Last 90 Days 37.2; Flight Crew Total 625; Flight Crew Type 522
Situational Awareness; Human-Machine Interface
Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance; Inflight Event / Encounter CFTT / CFIT
Air Traffic Control Issued Advisory / Alert; Flight Crew Returned To Clearance; Flight Crew Became Reoriented
Human Factors
While on a practice RNAV approach I went below the prescribed altitude prompting an attitude alert from tower (GPS also gave alt alert). I climbed back to altitude and finished approach. Need to be more vigilant with altitude control on approaches.
BE33 pilot reports descending the below the prescribed altitude during a practice RNAV approach to LOU in VMC. Both the aircraft GPS and the Tower give low altitude alerts.