AirIndex Research · FAA LID CA15

SIERRA NEVADA MEML HOSPITAL

GRASS VALLEY, CA. Operational · Private use.

OperationalPrivate usePrivate
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Data integrity

76/100
CorroboratedData Integrity Index
Independent inspection
Owner self-reported — never independently field-inspected
Location confidence
No coordinate anomaly detected
Terrain cross-check (USGS 3DEP)
FAA 2693 ft MSL · USGS ground 2652 ft · Δ 41 ft
Differential consistent with an elevated / rooftop pad
Structure cross-check (Overture / OSM)
On a building footprint — height not tagged in the source
Building height ≈ 41 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

ConstrainedConversion feasibility · obstruction screen
100 ft · eVTOL FATO
The recorded pad is 75 ft short of the 100 ft footprint an eVTOL would need — shown to scale.
recorded pad eVTOL FATO
Recorded pad (limiting side)
25 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
Obstruction 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.

FAA compliance

Q1 · FAA registrationPASS
Active FAA NASR 5010 record.
Q2 · Airspace determinationON_FILE
OE/AAA ASN 2024-AWP-5784-NRA: DET-to-Prop
Q3 · State enforcementSTRONG
State has adopted FAA AC as enforceable.
Q4 · NFPA 418UNKNOWN
NFPA 418 adoption status not yet assessed for this jurisdiction.

FAA facility data

FAA LID
CA15
AIX ID
aix:hp:BGY1FPJE
Lat / Lng
39.22748, -121.04765
Elevation
2693 ft MSL
Pad dimensions
45 × 25 ft
Surface type
CONC
Activation date
1982/09
Last owner update
2025/05/28

FAA OEAAA airspace determinations1

Airspace clearance
On file as archived / procedural records — no standing clearance to track.
Filing activity
Most recent determination 2024-06-17
  • NRAARCH-DeterminedASN 2024-AWP-5784-NRA
    2024-07-17
    Form 7480 · 28 ft AGL — LAP ASN # 2024-WSA-136-LAP-Update pad coordinates as well as elevation in preparation for Instrument Flight Procedures.
Blueprint
The record vs. what we measured
76/100
DATA INTEGRITY
eVTOL footprint
FATO 100 ft reqHTLOF 25 ft

The 25 ft pad is 75 ft short of the 100 ft an eVTOL FATO requires (measured).

SIGNALFEDERAL RECORDMEASURED
Surface elevation2693 ft2693 ft · USGS+structure
Structurenot on recordOn a building
Pad dimensions25 ft side (filed)25 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.
Request Ground Truth verification

Full risk assessment

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.

Request the full assessment

Building autonomous systems? See the machine-verified feed

Provenance FAA NASR 5010 · pad dims APT cycle 2026/03/19 · USGS 3DEP terrain · faa_usgs_diff structure · eVTOL screen conversion-feasibility-1.1 · AIX-ID aix:hp:BGY1FPJE · Methodology →
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