Skylane 182/RG Turbo Skylane/RG
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Flight Instructor; Flight Crew Commercial
Flight Crew Last 90 Days 90; Flight Crew Total 10100; Flight Crew Type 9000
Situational Awareness
Conflict NMAC
Air Traffic Control Issued Advisory / Alert; Flight Crew Took Evasive Action
Human Factors
We were on an IFR training flight controlled by Seattle Approach on 120.1. I was the CFII in the right seat. My student (aircraft owner) was flying the airplane. We were on the GPS approach to runway 35 at PLU. The controller cleared us for the approach and switch to advisory with a traffic call to the West. The setting sun made it impossible to spot the traffic. Shortly after the call; I spotted the other aircraft below and to our right about 200 feet; close enough to see the tail numbers. It had apparently crossed under us and was flying a pirate GPS approach. We had switched to advisory and they called a 'Straight in approach; traffic permitting.' I advised on the radio that we were passing on their left (to avoid collision.) We passed the Skyhawk and continued to the missed approach and contacted Seattle Approach. The Seattle controller questioned the incident and we advised of the Skyhawk flying a GPS approach without clearance.
C182 instructor pilot reported a NMAC with a C172 on approach to PLU.