Small Aircraft; High Wing; 1 Eng; Fixed Gear
Flight Crew Instrument; Flight Crew Private
Flight Crew Last 90 Days 3; Flight Crew Total 282; Flight Crew Type 17
Communication Breakdown; Confusion; Situational Awareness
ATC Issue All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued New Clearance; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Executed Go Around / Missed Approach
Chart Or Publication; Manuals; Procedure
Prior to the flight; I checked all relevant NOTAMS through the use of 1800wxbrief.com and through an electronic flight bag program. I noted there was a NOTAM for the RNAV 17 into UAO stating 'RNAV (GPS) RWY 17; ORIG-D... MISSED APPROACH: CLIMB TO 4000 DIRECT DUBMY AND HOLD; CONTINUE CLIMB IN HOLD TO 4000.' This NOTAM was only available in my electronic flight bag software; not on 1800wxbrief.com.With a safety pilot in the copilot seat; I filed an IFR flight plan to execute practice approaches. After flying the approach; I executed the missed approach and advised Approach I was 'climbing 4000; missed approach.' After reaching 4000; ATC advised me that the missed approach procedure was 'climb to 3500 to DUBMY.' I further queried ATC about the FDC NOTAM which changed the missed approach procedure to 'climb 4000 to DUBMY.' After researching the NOTAM; ATC notified me that 4000 was in fact the correct altitude.In this case; the NOTAM in question was a D-NOTAM. There is significant confusion surrounding D-NOTAMS with both pilots and ATC. I suspect that ATC might not review all D-NOTAMs and D-NOTAMS are not displayed on 1800wxbrief.com weather briefings. A difference in expectations could have created a potential conflict in this scenario. For improved safety; D-NOTAMS should be included in all pilot briefings.
A D-NOTAM changed the published missed approach altitude for the RNAV GPS Runway 17 approach at UAO. The TRACON was not aware of the change. The change was not included on the 1800wxbrief.com website.