{
  "schema": "midget-filter-seat-surface-survey-v1",
  "units": "mm",
  "method": null,
  "basis": null,
  "configuration": null,
  "filter_marking_observation": null,
  "photo_refs": [],
  "confirmed_geometry": {
    "flat_annular_seat_floor": null,
    "flat_annular_retained_gasket_head_face": null,
    "coaxial_faces": null,
    "reference_plane_normal_to_filter_axis": null,
    "fixed_filter_reference_preserved_during_floor_capture": null,
    "nominally_circular_faces": null
  },
  "frame": {
    "name": null,
    "reference_plane_and_axis_center": null,
    "positive_y_toward_head": null,
    "positive_x_witness": null,
    "positive_z": null,
    "capture_configuration": null,
    "right_handed_orthonormal": null
  },
  "dimensions_mm": {
    "seat_floor_outside_diameter": null,
    "seat_floor_inside_diameter": null,
    "retained_gasket_head_face_outside_diameter": null,
    "retained_gasket_head_face_inside_diameter": null,
    "seat_floor_depth_below_reference": null,
    "retained_gasket_head_face_signed_projection": null
  },
  "limits": "Blank direct-survey record. Two confirmed flat annular faces only; no solid thickness, gasket section/compression, identity, engine placement or fitted seal is inferred. Do not remove a filter or gasket solely to fill this worksheet; capture during planned service."
}