Owner self-reported — never independently field-inspected
Location confidence
No coordinate anomaly detected
Terrain cross-check (USGS 3DEP)
FAA 830 ft MSL · USGS ground 592 ft · Δ 238 ft
Differential consistent with an elevated / rooftop pad
Structure cross-check (Overture / OSM)
Rooftop pad — the coordinate falls on a building footprint
Building height ≈ 245 ft — measured independently of the FAA record
Cross-source consensus
Corroborated — terrain and structure agree (2/2 sources)
Cross-checked against independent public data — USGS 3DEP terrain, Overture/OSM building footprints, the federal hospital registry, and measured dimensions. The State of the U.S. Heliport Record →
The recorded pad is 50 ft short of the 100 ft footprint an eVTOL would need — shown to scale.
recorded pad eVTOL FATO
Recorded pad (limiting side)
50 ft
eVTOL FATO required
100 ft
FAA EB-105 vertiport pattern — 2× a ~50 ft eVTOL controlling dimension, plus a 125 ft safety-area side.
Load-bearing FATO
100 × 100 ft must be structural
No heliport precedent — typically the binding gate for rooftop and hospital pads.
Obstruction clearance
High obstacle within 0.5 nm — conflicts with the expanded footprint and 8:1 approach
Measured against FAA pad geometry and federal FATO sizing (EB-105). A dimensional pre-screen — site-level validation required, and independent of the underwriting risk score.
NFPA 418 adoption status not yet assessed for this jurisdiction.
FAA facility data
FAA LID
4IS3
AIX ID
aix:hp:JD4AF5Q5
Lat / Lng
41.79100, -87.60574
Elevation
830 ft MSL
Pad dimensions
50 × 50 ft
Surface type
PSP
Activation date
1984/02
Last owner update
2023/12/27
FAA OEAAA airspace determinations1
Airspace clearance
On file as archived / procedural records — no standing clearance to track.
Filing activity
Most recent determination 2011-12-22
NRAARCH-DeterminedASN 2011-AGL-6184-NRA2012-06-29
Heliport · 0 ft AGL — 7480-1 to establish an auxilliary pad for UCMC. The original pad will remain open and be the primary pad.\r\nContact info for this facility is changing near the end of January 2012. If additional contact info is needed contact Carol Para at IDOT Div of Aeronautics 217-785-4989.
Safety history (NTSB)1
Accident history
1 NTSB helicopter event within 3 nm since 2010 (1 accident); most recent 2025-03-10.
ACCIDENT1.4 nm2025-03-10
ROBINSON HELICOPTER R44 II · Chicago, IL — NTSB CAROL
NTSB helicopter accidents & incidents geocoded within 3 nm of this pad and attributed to the nearest facility — proximity, not a determination that an event occurred at this site. Source: NTSB aviation accident database.
Blueprint
The record vs. what we measured
70/100
DATA INTEGRITY
Surface elevation
The FAA record places this pad at 830 ft. USGS terrain plus the building put the actual rooftop at 837 ft — a +7 ft difference the federal record doesn’t carry.
eVTOL footprint
The 50 ft pad is 50 ft short of the 100 ft an eVTOL FATO requires (measured).
SIGNALFEDERAL RECORDMEASURED
Surface elevation830 ft837 ft · USGS+structure
Structurenot on recordRooftop pad
Pad dimensions50 ft side (filed)50 ft side · measured
Coordinate integrityas filedterrain cross-checked
Independent inspectionowner self-reportednone on record
✓Federal record
→
✓Cross-checkedUSGS · Overture · dimensions
→
3Physically verifiedGround Truth capture
Obstructions, exact FATO geometry, surface condition, and downwash exposure require a physical Ground Truth capture — not shown above as measured. A field verification completes the record and writes the measured truth to this facility’s authority.
This page is the public data-integrity record. The full RiskIndex assessment — Q1–Q5 compliance, dimensional / FATO analysis, an underwriting-grade risk score, peer benchmark, and a sealed Site Intelligence Report — is available on request.
THE UNIVERSITY OF CHICAGO MEDICINE, CHICAGO, IL (FAA 4IS3). AirIndex facility record aix:hp:JD4AF5Q5. Verifiable at https://www.airindex.io/verify/aix:hp:JD4AF5Q5.