diff --git a/Plant3D2026/P_Rec_Annot/src/PRecAnnot.Plant3D2026/EntryPoint.cs b/Plant3D2026/P_Rec_Annot/src/PRecAnnot.Plant3D2026/EntryPoint.cs
index 88a9a34..a6dd286 100644
--- a/Plant3D2026/P_Rec_Annot/src/PRecAnnot.Plant3D2026/EntryPoint.cs
+++ b/Plant3D2026/P_Rec_Annot/src/PRecAnnot.Plant3D2026/EntryPoint.cs
@@ -48,6 +48,7 @@ public sealed class EntryPoint : IExtensionApplication
     [CommandMethod("PXP-AE")] public void AutoElevationCommand() => ElevationCommands.RunAutomatic();
     [CommandMethod("PXP-IE")] public void InsertElevationCommand() => ElevationCommands.RunManual();
     [CommandMethod("PXP-COV")] public void CheckOrthoViewportCommand() => OrthoMaintenanceCommands.CheckViewport();
+    [CommandMethod("PXP-UOB")] public void UpdateOrthoViewBlocksCommand() => PRecAnnot.Plant3D2026.UpdateOrthoViewBlocksCommand.Run();
 
     [CommandMethod("PHP_REC_AUTOMATION_START", CommandFlags.Session)]
     public void AutomationStartCommand() => FirstLimitedApplyAutomationBootstrap.Arm();
diff --git a/Plant3D2026/P_Rec_Annot/src/PRecAnnot.Plant3D2026/UpdateOrthoViewBlocksCommand.cs b/Plant3D2026/P_Rec_Annot/src/PRecAnnot.Plant3D2026/UpdateOrthoViewBlocksCommand.cs
new file mode 100644
index 0000000..c27b8df
--- /dev/null
+++ b/Plant3D2026/P_Rec_Annot/src/PRecAnnot.Plant3D2026/UpdateOrthoViewBlocksCommand.cs
@@ -0,0 +1,65 @@
+using Autodesk.AutoCAD.DatabaseServices;
+using Autodesk.AutoCAD.EditorInput;
+using PRecAnnot.Abstractions;
+using PRecAnnot.Core;
+using AcadApplication = Autodesk.AutoCAD.ApplicationServices.Core.Application;
+using AcadColor = Autodesk.AutoCAD.Colors.Color;
+
+namespace PRecAnnot.Plant3D2026;
+
+internal static class UpdateOrthoViewBlocksCommand
+{
+    public static void Run()
+    {
+        var document = AcadApplication.DocumentManager.MdiActiveDocument; if (document is null) return;
+        try
+        {
+            var settings = Environment.GetEnvironmentVariable("P_REC_ANNOT_LINE_NUMBER_DRAWING_SETTINGS_PATH");
+            if (string.IsNullOrWhiteSpace(settings) || !File.Exists(settings)) throw new InvalidOperationException("ORTHO_LAYER_CONFIGURATION_REQUIRED");
+            var rules = new OrthoLayerSettingsLoader().Load(File.ReadAllText(settings));
+            var options = new PromptEntityOptions("\nВыберите видовой экран для обновления слоев блоков: "); options.SetRejectMessage("\nДолжен быть видовой экран."); options.AddAllowedClass(typeof(Viewport), true);
+            var selected = document.Editor.GetEntity(options); if (selected.Status != PromptStatus.OK) return;
+            string viewName; var changes = new List<(string Layer, OrthoLayerRule Rule)>();
+            using (var transaction = document.Database.TransactionManager.StartOpenCloseTransaction())
+            {
+                var viewport = (Viewport)transaction.GetObject(selected.ObjectId, OpenMode.ForRead);
+                var context = new PlantRuntimeContextReader().ReadCurrentContext(document);
+                var matched = context.Viewports.Where(x => Math.Abs(x.CenterX - viewport.CenterPoint.X) < .001 && Math.Abs(x.CenterY - viewport.CenterPoint.Y) < .001 && Math.Abs(x.Width - viewport.Width) < .001 && Math.Abs(x.Height - viewport.Height) < .001).ToArray();
+                viewName = matched.Length == 1 ? matched[0].ViewName ?? matched[0].DisplayName : throw new InvalidOperationException(matched.Length == 0 ? "ORTHO_VIEW_NOT_FOUND" : "ORTHO_VIEW_AMBIGUOUS");
+                var layers = (LayerTable)transaction.GetObject(document.Database.LayerTableId, OpenMode.ForRead);
+                foreach (ObjectId id in layers)
+                {
+                    var layer = (LayerTableRecord)transaction.GetObject(id, OpenMode.ForRead); var rule = rules.FirstOrDefault(x => x.MatchesLayer(viewName, layer.Name));
+                    if (rule is not null) changes.Add((layer.Name, rule));
+                }
+            }
+            document.Editor.WriteMessage($"\nPXP-UOB preview: view={viewName}; matching-layers={changes.Count}. DWG не изменён.");
+            RuntimeDiagnostics.Write("UpdateOrthoViewBlocksPreviewCompleted", commandName: "PXP-UOB", resultStatus: "PreviewCompleted", document: document, details: new Dictionary<string, object?> { ["ViewName"] = viewName, ["LayerCount"] = changes.Count });
+            if (!string.Equals(Environment.GetEnvironmentVariable("P_REC_ANNOT_RUNTIME_MODE"), "Apply", StringComparison.OrdinalIgnoreCase)) return;
+            ValidateFixture(document);
+            using var documentLock = document.LockDocument(); using var write = document.Database.TransactionManager.StartTransaction();
+            var layerTable = (LayerTable)write.GetObject(document.Database.LayerTableId, OpenMode.ForRead); var linetypes = (LinetypeTable)write.GetObject(document.Database.LinetypeTableId, OpenMode.ForRead);
+            foreach (var change in changes)
+            {
+                var layer = (LayerTableRecord)write.GetObject(layerTable[change.Layer], OpenMode.ForWrite); Apply(layer, change.Rule, linetypes);
+            }
+            var viewportToUpdate = (Viewport)write.GetObject(selected.ObjectId, OpenMode.ForWrite); if (layerTable.Has("Defpoints")) viewportToUpdate.LayerId = layerTable["Defpoints"];
+            write.Commit(); document.Editor.WriteMessage($"\nPXP-UOB Apply: updated-layers={changes.Count}; AutoCAD UNDO is available.");
+            RuntimeDiagnostics.Write("UpdateOrthoViewBlocksApplyCompleted", commandName: "PXP-UOB", resultStatus: "Applied", document: document, details: new Dictionary<string, object?> { ["LayerCount"] = changes.Count });
+        }
+        catch (Exception exception) { RuntimeDiagnostics.Write("UpdateOrthoViewBlocksFailed", "ERROR", commandName: "PXP-UOB", resultStatus: exception.Message, exception: exception, document: document); document.Editor.WriteMessage("\nPXP-UOB: " + exception.Message); }
+    }
+    private static void Apply(LayerTableRecord layer, OrthoLayerRule rule, LinetypeTable linetypes)
+    {
+        if (rule.LineWeight.HasValue) layer.LineWeight = (LineWeight)rule.LineWeight.Value;
+        if (!string.IsNullOrWhiteSpace(rule.LineType) && linetypes.Has(rule.LineType)) layer.LinetypeObjectId = linetypes[rule.LineType];
+        if (rule.Red.HasValue) layer.Color = AcadColor.FromRgb(rule.Red.Value, rule.Green!.Value, rule.Blue!.Value);
+        else if (rule.ColorIndex.HasValue) layer.Color = AcadColor.FromColorIndex(Autodesk.AutoCAD.Colors.ColorMethod.ByColor, rule.ColorIndex.Value);
+    }
+    private static void ValidateFixture(Autodesk.AutoCAD.ApplicationServices.Document document)
+    {
+        var marker = Environment.GetEnvironmentVariable("P_REC_ANNOT_ORTHO_MAINTENANCE_FIXTURE_MARKER");
+        if (string.IsNullOrWhiteSpace(marker) || !File.Exists(marker) || !string.Equals(File.ReadAllText(marker).Trim(), "P_REC_ANNOT_TEST_FIXTURE=ORTHO_MAINTENANCE_APPLY", StringComparison.Ordinal)) throw new InvalidOperationException("ORTHO_MAINTENANCE_TEST_FIXTURE_REQUIRED");
+        var root = Path.GetDirectoryName(Path.GetFullPath(marker))! + Path.DirectorySeparatorChar; if (!Path.GetFullPath(document.Name).StartsWith(root, StringComparison.OrdinalIgnoreCase)) throw new InvalidOperationException("ORTHO_MAINTENANCE_TEST_FIXTURE_REQUIRED");
+    }
+}