Owner self-reported — never independently field-inspected
Location confidence
No coordinate anomaly detected
Terrain cross-check (USGS 3DEP)
FAA 174 ft MSL · USGS ground 53 ft · Δ 121 ft
Differential consistent with an elevated / rooftop pad
Structure cross-check (Overture / OSM)
Rooftop pad — the coordinate falls on a building footprint
Building height ≈ 118 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 47 ft short of the 100 ft footprint an eVTOL would need — shown to scale.
recorded pad eVTOL FATO
Recorded pad (limiting side)
53 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.
NFPA 418 adoption status not yet assessed for this jurisdiction.
FAA facility data
FAA LID
24DC
AIX ID
aix:hp:W18QTN6X
Lat / Lng
38.90092, -77.05109
Elevation
174 ft MSL
Pad dimensions
53 × 53 ft
Surface type
MATS
Activation date
2020/01
FAA OEAAA airspace determinations3
Airspace clearance
On file as archived / procedural records — no standing clearance to track.
Filing activity
Most recent determination 2020-01-08
NRAARCH-DeterminedASN 2020-AEA-50-NRA2020-01-08
Heliport · 0 ft AGL — LAP ASN # 2019-ESA-158-LAP. This case was created to enable the generation of the Helipad SiteId and Location Identifier for the temporary LocId 8086. The Prior study 2017-AEA-2440-NRA was completed with a favorable determination. Therefore NO additional aeronautical study needs to be completed.
NRAARCH-DeterminedASN 2017-AEA-2440-NRA2017-12-13
Heliport · 0 ft AGL — Establish new Heliport.\r\nThe case was resubmitted due to the proponent's/sponsor's inability to acquire the proper permits prior to the original case expiration (void) date. The new case has the same data for review. The original Letter of Determination has been uploaded to this case for ease of review by the Lines of Businesses that need to review and re-conduct their Aeronautical Study.
NRAARCH-DeterminedASN 2015-AEA-302-NRA2015-08-31
Heliport · 120 ft AGL — Establish new Heliport
Blueprint
The record vs. what we measured
70/100
DATA INTEGRITY
eVTOL footprint
The 53 ft pad is 47 ft short of the 100 ft an eVTOL FATO requires (measured).
SIGNALFEDERAL RECORDMEASURED
Surface elevation174 ft170 ft · USGS+structure
Structurenot on recordRooftop pad
Pad dimensions53 ft side (filed)53 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.
GEORGE WASHINGTON UNIVERSITY, WASHINGTON, DC (FAA 24DC). AirIndex facility record aix:hp:W18QTN6X. Verifiable at https://www.airindex.io/verify/aix:hp:W18QTN6X.