SR22
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 6
Communication Breakdown; Confusion; Situational Awareness; Troubleshooting
ATC Issue All Types; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Inflight Event / Encounter CFTT / CFIT
Air Traffic Control Issued New Clearance
Airspace Structure; Procedure; Human Factors
Portland north Sector called to tell me that Aircraft X was planning to cancel IFR for 4S2 and to [give] Approval Request Direct to 4S2. I approved the Approval Request. The data block shows the aircraft will be at 7;000 ft. Aircraft X checks in on my frequency level at 6;000 ft. I was startled by this information because the minimum IFR altitude is 6;800 ft. Aircraft X did look like he was still on T276; so I thought maybe that was an acceptable altitude on the T-route. I checked and the T-route was 6;500. So I climbed Aircraft X to 7;000 ft. and then coordinated this with Portland North. I then asked the pilot if he was still on T276 and he said affirmative. So; that was confusing information.I recommend remedial training to the Portland controller on the MEAs on T276 and the Portland/Seattle LOA.
Seattle Center Controller reported that an aircraft was handed off below the MIA; resulting in CFTT.