diff --git a/AircraftPlant/AircraftPlantBusinessLogic/BusinessLogics/OrderLogic.cs b/AircraftPlant/AircraftPlantBusinessLogic/BusinessLogics/OrderLogic.cs
index 0d0dabb..88da590 100644
--- a/AircraftPlant/AircraftPlantBusinessLogic/BusinessLogics/OrderLogic.cs
+++ b/AircraftPlant/AircraftPlantBusinessLogic/BusinessLogics/OrderLogic.cs
@@ -211,7 +211,7 @@ namespace AircraftPlantBusinessLogic.BusinessLogics
 
             model.Status = newStatus;
 
-            if (newStatus == OrderStatus.Выдан)
+            if (model.Status == OrderStatus.Готов || element.Status == OrderStatus.Ожидание)
             {
                 var plane = _planeStorage.GetElement(new PlaneSearchModel { Id = element.PlaneId });
                 if (plane == null)
@@ -219,27 +219,22 @@ namespace AircraftPlantBusinessLogic.BusinessLogics
                     _logger.LogWarning("Status change error. Plane not found");
                     return false;
                 }
+
                 if (!CheckSupply(plane, element.Count))
                 {
-                    _logger.LogWarning("Status change error. Shop is overflowed");
-
                     model.Status = OrderStatus.Ожидание;
-                    if (_orderStorage.Update(model) == null)
-                    {
-						_logger.LogWarning("Change status operation failed");
-					}
-                    return false;
+                    _logger.LogWarning("Status change error. Shop is overflowed");
+                }
+                else
+                {
+                    model.DateImplement = DateTime.Now;
                 }
-            }
-
-            if (model.Status == OrderStatus.Выдан)
-            {
-                model.DateImplement = DateTime.Now;
             }
             else
             {
                 model.DateImplement = element.DateImplement;
             }
+
             CheckModel(model, false);
             if (_orderStorage.Update(model) == null)
             {
diff --git a/AircraftPlant/AircraftPlantBusinessLogic/BusinessLogics/WorkModeling.cs b/AircraftPlant/AircraftPlantBusinessLogic/BusinessLogics/WorkModeling.cs
index 10f540a..7aba89f 100644
--- a/AircraftPlant/AircraftPlantBusinessLogic/BusinessLogics/WorkModeling.cs
+++ b/AircraftPlant/AircraftPlantBusinessLogic/BusinessLogics/WorkModeling.cs
@@ -27,10 +27,13 @@ namespace AircraftPlantBusinessLogic.BusinessLogics
         /// </summary>
         private readonly Random _rnd;
 
-        /// <summary>
-        /// Бизнес-логика для заказов
-        /// </summary>
-        private IOrderLogic? _orderLogic;
+		private readonly object orderLock = new object();
+		private readonly object waitingOrderLock = new object();
+
+		/// <summary>
+		/// Бизнес-логика для заказов
+		/// </summary>
+		private IOrderLogic? _orderLogic;
 
         /// <summary>
         /// Конструктор
@@ -58,13 +61,8 @@ namespace AircraftPlantBusinessLogic.BusinessLogics
             }
 
             var orders = _orderLogic.ReadList(new OrderSearchModel { Status = OrderStatus.Принят });
-            if (orders == null || orders.Count == 0)
-            {
-                _logger.LogWarning("DoWork. Orders is null or empty");
-                return;
-            }
 
-            _logger.LogDebug("DoWork for {Count} orders", orders.Count);
+            _logger.LogDebug("DoWork for {Count} orders", orders?.Count);
             foreach (var implementer in implementers)
             {
                 Task.Run(() => WorkerWorkAsync(implementer, orders));
@@ -95,17 +93,20 @@ namespace AircraftPlantBusinessLogic.BusinessLogics
                     try
                     {
                         _logger.LogDebug("DoWork. Worker {Id} try get order {Order}", implementer.Id, order.Id);
-                        // пытаемся назначить заказ на исполнителя
-                        _orderLogic.TakeOrderInWork(new OrderBindingModel
-                        {
-                            Id = order.Id,
-                            ImplementerId = implementer.Id
-                        });
+						// пытаемся назначить заказ на исполнителя
+						lock (orderLock)
+						{
+							_orderLogic.TakeOrderInWork(new OrderBindingModel
+							{
+								Id = order.Id,
+								ImplementerId = implementer.Id
+							});
+						}
 
-                        // делаем работу
-                        Thread.Sleep(implementer.WorkExperience * _rnd.Next(100, 1000) * order.Count);
+						// делаем работу
+						Thread.Sleep(implementer.WorkExperience * _rnd.Next(100, 1000) * order.Count);
                         _logger.LogDebug("DoWork. Worker {Id} finish order {Order}", implementer.Id, order.Id);
-                        _orderLogic.FinishOrder(new OrderBindingModel
+                        _orderLogic.DeliveryOrder(new OrderBindingModel
                         {
                             Id = order.Id
                         });
@@ -155,7 +156,7 @@ namespace AircraftPlantBusinessLogic.BusinessLogics
                 // доделываем работу
                 Thread.Sleep(implementer.WorkExperience * _rnd.Next(100, 300) * runOrder.Count);
                 _logger.LogDebug("DoWork. Worker {Id} finish order {Order}", implementer.Id, runOrder.Id);
-                _orderLogic.FinishOrder(new OrderBindingModel
+                _orderLogic.DeliveryOrder(new OrderBindingModel
                 {
                     Id = runOrder.Id
                 });
@@ -203,10 +204,13 @@ namespace AircraftPlantBusinessLogic.BusinessLogics
 				foreach (var order in orders)
 				{
 					_logger.LogDebug("DoWork. Worker {Id} finish order {Order}", implementer.Id, order.Id);
-					_orderLogic.FinishOrder(new OrderBindingModel
-					{
-						Id = order.Id
-					});
+					lock (waitingOrderLock)
+                    {
+						_orderLogic.DeliveryOrder(new OrderBindingModel
+						{
+							Id = order.Id
+						});
+					}
 
 					// отдыхаем
 					Thread.Sleep(implementer.Qualification * _rnd.Next(10, 100));