Skylane 182/RG Turbo Skylane/RG
Flight Crew Commercial; Flight Crew Flight Instructor; Flight Crew Instrument
Flight Crew Last 90 Days 29; Flight Crew Total 2750; Flight Crew Type 550
Situational Awareness
Aircraft Equipment Problem Less Severe; Deviation - Altitude Excursion From Assigned Altitude; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter CFTT / CFIT
Air Traffic Control Issued Advisory / Alert; Flight Crew Became Reoriented
Aircraft; Human Factors
While flying the RNAV the Glide path failed to activate; Reverted to the LNAV minimums (900 ft MSL). After descending to about 980 ft MSL; and having broken out of the clouds at 1100 ft MSL received an altitude warning from the tower. Confirmed altitude and went to; and maintained 1000 ft MSL; and reported that fact to tower. Had runway in sight at the time and proceeded with a normal landing. While I believe that I operated consistent with the requirements for the LNAV approach; I did step down rapidly after 'ZZZZZ' intersection and I suspect that the tower was expecting an LPV approach. In hindsight I should have reduced altitude at a slower rate. I will also determine why the glide path did not activate.
C182 pilot reported receiving a low altitude alert from the Tower likely caused by descending quickly.