Small Transport; Low Wing; 2 Turbojet Eng
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 6
Confusion; Situational Awareness; Training / Qualification
ATC Issue All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance; Inflight Event / Encounter CFTT / CFIT
Airport; Procedure; Human Factors; Airspace Structure
While working the mid shift; I had Aircraft X inbound to an airport. They requested direct to an IAF for the ILS Approach. I had the approach plate pulled up on our display; issued direct to the fix and gave the aircraft approach clearance with a restriction to cross a fix at or above 10;000 ft. The fix is in a 10;000 ft. Minimum IFR Altitude (MIA) so that cleared the terrain. I missed on the approach that the fix has an altitude of 13;000 ft. in an MIA of 10;000 ft.; the next fix has an altitude of 12;000 ft. in an MIA of 11;000 ft.; and then the next fix has a crossing altitude of 8;200 ft. in a MIA of 9;000 ft. I misinterpreted the information on the approach plate and crossed the aircraft at 10;000 ft. to initiate the approach which was not a safe altitude according to the approach plate or my MIAs as the aircraft descended to 10;000 ft. and proceeded to enter an 11;000 ft. MIA. I believe at this point I had the aircraft switched over to CTAF or shortly after I had the MSAW (Minimum Safe Altitude Warning) alert flashing 11;000 ft. It did not occur to me to double check that the crossing restriction was ok; seeing as how I had cleared the aircraft on the approach.It is not often that we clear aircraft for the ILS from over that fix due to the fact that Approach works the airspace throughout the day and most of the aircraft arriving at this airport on the midshift come from the east; which we usually give them the arc for the approach. We have other approaches in our airspace that have an approach altitude higher than the terrain. This was an assumption on my part that the altitude was ok for the approach. This is not a system wide issue; but a lack of thoroughly reviewing the approach plate on my part to ensure altitudes given are safe for the approach and above the terrain.
Center Controller reported they issued an approach clearance with incorrect altitude restrictions that placed an aircraft below the Minimum IFR Altitude and activated the Center MSAW.