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Owner self-reported — never independently field-inspected
Location confidence
No coordinate anomaly detected
Terrain cross-check (USGS 3DEP)
FAA 1305 ft MSL · USGS ground 1239 ft · Δ 66 ft
Differential consistent with an elevated / rooftop pad
Structure cross-check (Overture / OSM)
Rooftop pad — the coordinate falls on a building footprint
Building height ≈ 46 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 →
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 45 feet of expansion
Recorded pad side 55 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 45 ft short of the 100 ft footprint an eVTOL would need — shown to scale.
recorded pad eVTOL FATO
Recorded pad (limiting side)
55 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
3OK4
AIX ID
aix:hp:MK21W8MP
Lat / Lng
35.47803, -97.52352
Elevation
1305 ft MSL
Pad dimensions
55 × 55 ft
Surface type
CONC
Surface condition
FAIR
Activation date
1969/08
Last owner update
2022/02/14
FAA OEAAA airspace determinations2
Airspace clearance
On file as archived / procedural records — no standing clearance to track.
Filing activity
Most recent determination 2013-02-13
NRAARCH-DeterminedASN 2013-ASW-683-NRA2013-05-21
Heliport · 85 ft AGL — Construction of a private owned private use hospital heliport. The helipad will be located on a new 6-story hospital addition for St. Anthony Hospital Oklahoma City OK Oklahoma County. The helipad will be prefabricated aluminum heliport deck 53'-0\ x 53'-0\ marked and lighted.
NRAARCH-DeterminedASN 2004-ASW-142-NRA2004-05-19
Other · 0 ft AGL — Establishment of heliport.\r\n\r\nCoordinates revised (6/11/04 email) NAD83:\r\n35-28-52.962\r\n97-30-09.926
Blueprint
The record vs. what we measured
64/100
DATA INTEGRITY
Surface elevation
The FAA record places this pad at 1305 ft. USGS terrain plus the building put the actual rooftop at 1285 ft — a -20 ft difference the federal record doesn’t carry.
eVTOL footprint
The 55 ft pad is 45 ft short of the 100 ft an eVTOL FATO requires (measured).
SIGNALFEDERAL RECORDMEASURED
Surface elevation1305 ft1285 ft · USGS+structure
Structurenot on recordRooftop pad
Pad dimensions55 ft side (filed)55 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.