AirIndex Research · FAA LID 99MN

MAYO CLINIC ST MARYS HOSPITAL

ROCHESTER, MN. 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 1166 ft MSL · USGS ground 1028 ft · Δ 138 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 ≈ 138 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

INFEASIBLE WITHOUT REMEDIATIONConversion feasibility · four readings, one line each
Obstruction screen
Severe
High obstacle within 0.5 nm conflicts with the expanded footprint and the 8:1 approach surface.
Geometry
Requires 49 feet of expansion
Recorded pad side 51 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
Infeasible without remediation
A high obstacle conflicts with the expanded footprint. Remediation or a different site.
100 ft · eVTOL FATO51 ft
The recorded pad is 49 ft short of the 100 ft footprint an eVTOL would need — shown to scale.
recorded pad eVTOL FATO
Recorded pad (limiting side)
51 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.

FAA compliance

Q1 · FAA registrationPASS
Active FAA NASR 5010 record.
Q2 · Airspace determinationON_FILE
OE3A archive: ASN 2023-AGL-10613-NRA determined 2023-10-10
Q3 · State enforcementLIMITED
State has limited enforcement of FAA standards.
Q4 · NFPA 418UNKNOWN
NFPA 418 adoption status not yet assessed for this jurisdiction.

FAA facility data

FAA LID
99MN
AIX ID
aix:hp:G6CD0FD5
Lat / Lng
44.01977, -92.48305
Elevation
1166 ft MSL
Pad dimensions
91 × 51 ft
Surface type
CONC
Activation date
1984/10
Last owner update
2024/05/01

FAA OEAAA airspace determinations1

Airspace clearance
On file as archived / procedural records — no standing clearance to track.
Filing activity
Most recent determination 2023-07-26
  • NRAARCH-DeterminedASN 2023-AGL-10613-NRA
    2023-10-10
    Form 7480 · 120 ft AGL — LAP ASN # 2023-CSA-141-LAP\r\nHickok & Associates also holds letters of authorizations issued by FAA Flight Standards as Procedure Evaluation Pilot (PEP) and; is authorized to perform the Evaluation and Surveillance of Heliports typically performed by an FAA Flight Standards Operations aviation safety inspector (ASI) as part of the FAA Form 7480-1 submission/process. (Ref. see FAAO 8900.1 Chapter 3 Section 8-212.B.) Hickok & Associates has performed and completed the heliport evaluation/7480-1 evaluation associated with this submission. FAA may choose to send an ASI but it is not necessary per the reference herein. Updated coordinates and elevation.
Blueprint
The record vs. what we measured
76/100
DATA INTEGRITY
eVTOL footprint
FATO 100 ft reqHTLOF 51 ft

The 51 ft pad is 49 ft short of the 100 ft an eVTOL FATO requires (measured).

SIGNALFEDERAL RECORDMEASURED
Surface elevation1166 ft1166 ft · USGS+structure
Structurenot on recordOn a building
Pad dimensions51 ft side (filed)51 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:G6CD0FD5 · Methodology →
Cite this facility

MAYO CLINIC ST MARYS HOSPITAL, ROCHESTER, MN (FAA 99MN). AirIndex facility record aix:hp:G6CD0FD5. Verifiable at https://www.airindex.io/verify/aix:hp:G6CD0FD5.

Verify this record →

AIX-IDs are free to cite and reference; the registry is the source of record. The verify link resolves this record against the audit chain.

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