Small Aircraft; Low Wing; 2 Eng; Retractable Gear
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 13
Situational Awareness
ATC Issue All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Ground Equipment Issue; Inflight Event / Encounter CFTT / CFIT
Air Traffic Control Issued Advisory / Alert; Air Traffic Control Issued New Clearance
Chart Or Publication; Human Factors; Procedure; Software and Automation; Airspace Structure
Aircraft X at 3;000 [feet]. ZME flashed Aircraft X at me in level flight at 3;000 [feet]. I turned on the MIA (minimum IFR altitude) chart because he seemed close to an area where the MIA is 3;500 [feet]; but the MSAW (minimum safe altitude warning) alarm was not going off. At the time he was approximately 23 [miles] from MDH and was within the 3;500 [foot] MIA area. I called ZME and asked if the aircraft was in fact level at 3;000 [feet] or if there were any unknown issues. She paused for a second and replied; Oh my god; your right". We then got off the line. At that point the MSAW went off. ZME called back later and stated her MSAW never went off. I explained to her mine hadn't either until right after we spoke. Investigate why the MSAW didn't go off prior to or even during entry into the area where the aircraft was below the MIA."
A Center Controller reported another Center Controller handed them off an aircraft flying below the Minimum IFR Altitude.