Owner self-reported — never independently field-inspected
Location confidence
No coordinate anomaly detected
Terrain cross-check (USGS 3DEP)
FAA 1058 ft MSL · USGS ground 940 ft · Δ 118 ft
Differential consistent with an elevated / rooftop pad
Structure cross-check (Overture / OSM)
Rooftop pad — the coordinate falls on a building footprint
Building height ≈ 66 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 46 ft short of the 100 ft footprint an eVTOL would need — shown to scale.
recorded pad eVTOL FATO
Recorded pad (limiting side)
54 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.
IBC references NFPA 418 for rooftop facilities. Standalone fire code reference not confirmed.
FAA facility data
FAA LID
XS85
AIX ID
aix:hp:GYXA35A0
Lat / Lng
29.50892, -98.58022
Elevation
1058 ft MSL
Pad dimensions
54 × 54 ft
Surface type
CONC
Surface condition
FAIR
Activation date
1972/09
Last owner update
2024/02/09
FAA OEAAA airspace determinations2
Airspace clearance
On file as archived / procedural records — no standing clearance to track.
Filing activity
Most recent determination 2010-05-10
NRAARCH-DeterminedASN 2010-ASW-1077-NRA2010-06-25
Other · 0 ft AGL — Remove 4TX9 from FAA's database. 4TX9 appears to be a duplicate record for XS85 University Health System. We are currently studying the helipad relocation (H1) and a helipad addition (H2) for XS85 under ASN 2010-ASW-949-NRA.
NRAARCH-DeterminedASN 2010-ASW-949-NRA2010-06-24
Heliport · 116 ft AGL — Construction of a new Heliport (H2) on the top of the Physicians Parking Garage.\r\n\r\nThe owner will also be relocating the existing XS85 heliport (now identified as H1) to the top of the west parking garage (est. November 2010).\r\n\r\nIdentifier 4TX9 appears to be the same heliport with another identifier. A study to close 4TX9 will be initiated.
Blueprint
The record vs. what we measured
64/100
DATA INTEGRITY
Surface elevation
The FAA record places this pad at 1058 ft. USGS terrain plus the building put the actual rooftop at 1005 ft — a -53 ft difference the federal record doesn’t carry.
eVTOL footprint
The 54 ft pad is 46 ft short of the 100 ft an eVTOL FATO requires (measured).
SIGNALFEDERAL RECORDMEASURED
Surface elevation1058 ft1005 ft · USGS+structure
Structurenot on recordRooftop pad
Pad dimensions54 ft side (filed)54 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.
UNIVERSITY HEALTH SYSTEM, SAN ANTONIO, TX (FAA XS85). AirIndex facility record aix:hp:GYXA35A0. Verifiable at https://www.airindex.io/verify/aix:hp:GYXA35A0.