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Owner self-reported — never independently field-inspected
Location confidence
No coordinate anomaly detected
Terrain cross-check (USGS 3DEP)
FAA 174 ft MSL · USGS ground 110 ft · Δ 64 ft
Differential consistent with an elevated / rooftop pad
Structure cross-check (Overture / OSM)
Rooftop pad — the coordinate falls on a building footprint
Building height ≈ 23 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
CONDITIONALConversion feasibility · four readings, one line each
Obstruction screen
Clear
No obstructions within 0.5 nm on the FAA obstacle file.
Geometry
Requires 56 feet of expansion
Recorded pad side 44 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
Conditional
Obstruction screen passed. Geometry and structural capacity remain open. Site validation required.
The recorded pad is 56 ft short of the 100 ft footprint an eVTOL would need — shown to scale.
recorded pad eVTOL FATO
Recorded pad (limiting side)
44 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
CA58
AIX ID
aix:hp:JAC8ASGE
Lat / Lng
37.51259, -120.83925
Elevation
174 ft MSL
Pad dimensions
44 × 44 ft
Surface type
ROOF-TOP
Surface condition
GOOD
Activation date
1988/08
Last owner update
2019/10/03
FAA OEAAA airspace determinations5
Airspace clearance
On file as archived / procedural records — no standing clearance to track.
Filing activity
Most recent determination 2018-07-25
NRAARCH-DeterminedASN 2018-AWP-2812-NRA2022-06-15
Form 7480 · 1 ft AGL — LAP ASN # 2017-WSA-35-LAP
NRAARCH-DeterminedASN 2012-AWP-1873-NRA2014-07-30
Other · 0 ft AGL — Relocated Helipad on ground to roof of new building. Helipad is concrete FATO is 80' x 80' TLOF is 45' x 45' and magnetic direction of ingress/egress routes is 070 degrees clockwise to 230 degrees.
NRAARCH-DeterminedASN 2010-AWP-1547-NRA2010-11-22
Heliport · 0 ft AGL — Establishment of a Rooftop Helipad. This pad is only for loading and unloading of patients. No fuel storage is maintained. \r\nFATO: 80' sq.\r\nTLOF: 45' sq.\r\nMagnetic Direction of Ingress/Egress: 070 degrees clockwise to 230 degrees.
NRAARCH-DeterminedASN 2006-AWP-194-NRA2006-10-05
Heliport · 60 ft AGL — Establish rooftop heliport to replace an exisitng ground level heliport. Lighted windcone perimeter lights to be installed; 45' 0\ square TLOF Sikorsky S-76 design helicopter; 80' 0\ square FATO; private use/private owner;\r\nCL of flt path bearing 050 & 250 Deg.\r\nSite Plan drawing provided w/ form 7480-1
NRAARCH-DeterminedASN 2004-AWP-761-NRA2005-02-04
Heliport · 0 ft AGL — New Helipad location on the roof of the new three story bldg expansion at the hospital.
Blueprint
The record vs. what we measured
64/100
DATA INTEGRITY
Surface elevation
The FAA record places this pad at 174 ft. USGS terrain plus the building put the actual rooftop at 133 ft — a -41 ft difference the federal record doesn’t carry.
eVTOL footprint
The 44 ft pad is 56 ft short of the 100 ft an eVTOL FATO requires (measured).
SIGNALFEDERAL RECORDMEASURED
Surface elevation174 ft133 ft · USGS+structure
Structurenot on recordRooftop pad
Pad dimensions44 ft side (filed)44 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.
EMANUEL MEDICAL CENTER, TURLOCK, CA (FAA CA58). AirIndex facility record aix:hp:JAC8ASGE. Verifiable at https://www.airindex.io/verify/aix:hp:JAC8ASGE.