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Owner self-reported — never independently field-inspected
Location confidence
No coordinate anomaly detected
Terrain cross-check (USGS 3DEP)
FAA 633 ft MSL · USGS ground 638 ft · Δ -5 ft
Structure cross-check (Overture / OSM)
Ground-level — no building footprint at the coordinate
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 →
eVTOL readiness
UNVERIFIEDConversion feasibility · four readings, one line each
Obstruction screen
No data
No FAA obstacle data on file for this state. Clearance unverified.
Geometry
Requires 10 feet of expansion
Recorded pad side 90 ft against a 100 ft eVTOL FATO.
Structural FATO
Unverified
The full 100 × 100 ft FATO must be load-bearing. The FAA does not record structural capacity, so no record can confirm it.
Overall
Unverified
No obstruction data on file. The dimensional gap applies; clearance is unverified.
The recorded pad is 10 ft short of the 100 ft footprint an eVTOL would need — shown to scale.
recorded pad eVTOL FATO
Recorded pad (limiting side)
90 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.
Measured against FAA pad geometry and federal FATO sizing (EB-105). The obstruction screen is the only reading the engine verdict rests on; geometry and structural capacity are stated separately and never folded into it. 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
8MO9
AIX ID
aix:hp:WV3427GB
Lat / Lng
38.64367, -90.44834
Elevation
633 ft MSL
Pad dimensions
135 × 90 ft
Surface type
CONC
Activation date
1973/08
Last owner update
2019/09/08
FAA OEAAA airspace determinations2
Airspace clearance
On file as archived / procedural records — no standing clearance to track.
Filing activity
Most recent determination 2014-07-01
NRAARCH-DeterminedASN 2014-ACE-1756-NRA2015-08-20
Heliport · 0 ft AGL — Existing private-use VFR helipad with TLOF 46' x 46'; FATO 86' x 86'. Ingress 30 degrees; Egress 330 degrees. Concrete with lighting.
NRAARCH-DeterminedASN 2014-ACE-2860-NRA2015-08-04
Other · 0 ft AGL — Abandonment of heliport 8MO9 effective September 16 2005.
Blueprint
The record vs. what we measured
57/100
DATA INTEGRITY
eVTOL footprint
The 90 ft pad is 10 ft short of the 100 ft an eVTOL FATO requires (measured).
SIGNALFEDERAL RECORDMEASURED
Surface elevation633 ftnot cross-checked
Structurenot on recordGround-level
Pad dimensions90 ft side (filed)90 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.
MERCY HOSPITAL ST LOUIS, ST LOUIS, MO (FAA 8MO9). AirIndex facility record aix:hp:WV3427GB. Verifiable at https://www.airindex.io/verify/aix:hp:WV3427GB.