Small Aircraft
Air Traffic Control Developmental
Communication Breakdown; Time Pressure
ATC Issue All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter CFTT / CFIT
Air Traffic Control Issued Advisory / Alert; Air Traffic Control Issued New Clearance
Aircraft; Human Factors
Aircraft X was cleared by Approach to ZZZ and placed on a heading of 180 climbing to 040. The aircraft checked on with me still climbing below the MIA (Minimum IFR Altitude) of 030 heading towards a 050 MIA within a minute and a half. The aircraft was also climbing at less than a 300 ft per minute climb rate. I initially went to turn him away from the MIA but he was still below the MIA of 030. The pilot read it back as a question so I responded negative; maintain current heading of 180. And he read that back correct. The pilot was having a hard time hearing me also when I asked to be out of 030ft in 1 minute or less. So I asked him if he had all surrounding terrain in sight and to maintain his own terrain and obstruction clearance then I also climbed him to 050ft. Pilots should advise if they're climb rate is going to be less than 300 ft per minute especially on an IFR clearance. Better coordination should have been done with myself and PDX approach.
ZSE Controller reported an IFR departure at less than expected standard climb rate entering a higher MVA.