Owner self-reported — never independently field-inspected
Location confidence
No coordinate anomaly detected
Terrain cross-check (USGS 3DEP)
FAA 12 ft MSL · USGS ground 13 ft · Δ -1 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 →
The recorded pad is 40 ft short of the 100 ft footprint an eVTOL would need — shown to scale.
recorded pad eVTOL FATO
Recorded pad (limiting side)
60 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
Clear — no obstructions within 0.5 nm on the FAA obstacle file
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.
IBC references NFPA 418 for rooftop facilities. Standalone fire code reference not confirmed.
FAA facility data
FAA LID
3XA5
AIX ID
aix:hp:8E90EFWF
Lat / Lng
29.55054, -95.08574
Elevation
12 ft MSL
Pad dimensions
60 × 60 ft
Surface type
CONC
Activation date
2007/12
Last owner update
2020/08/10
FAA OEAAA airspace determinations1
Airspace clearance
On file as archived / procedural records — no standing clearance to track.
Filing activity
Most recent determination 2007-02-16
NRAARCH-DeterminedASN 2007-ASW-110-NRA2007-03-26
Other · 0 ft AGL — Establish (Existing) private-use hospital helipad.
Blueprint
The record vs. what we measured
67/100
DATA INTEGRITY
eVTOL footprint
The 60 ft pad is 40 ft short of the 100 ft an eVTOL FATO requires (measured).
SIGNALFEDERAL RECORDMEASURED
Surface elevation12 ftnot cross-checked
Structurenot on recordGround-level
Pad dimensions60 ft side (filed)60 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.
HOUSTON METHODIST ST JOHN HOSPITAL, NASSAU BAY, TX (FAA 3XA5). AirIndex facility record aix:hp:8E90EFWF. Verifiable at https://www.airindex.io/verify/aix:hp:8E90EFWF.