diff --git a/apps/as/src/pages/instl-sncn/ui/components/floating-action-buttons.tsx b/apps/as/src/pages/instl-sncn/ui/components/floating-action-buttons.tsx
index 6f78e7951..1bbafa208 100644
--- a/apps/as/src/pages/instl-sncn/ui/components/floating-action-buttons.tsx
+++ b/apps/as/src/pages/instl-sncn/ui/components/floating-action-buttons.tsx
@@ -5,6 +5,7 @@ import { useRouter } from "next/navigation";
 
 import { useConfirm } from "@frontend-opensource/use-react-hooks";
 import { useQueryClient } from "@tanstack/react-query";
+import { AxiosError } from "axios";
 
 import { useAlertStore, useUserStore } from "@/shared/lib";
 import { type ElaprDmndSaveRequestDto, elaprDmndService, type ElaprTmplt } from "@/entities/elapr";
@@ -120,7 +121,13 @@ function FloatingActionButtons({
           });
         },
         onError: (error) => {
-          alert(error.message || "처리 중 오류가 발생했습니다.");
+          let errorMessage = "";
+          if (error instanceof AxiosError) {
+            errorMessage = error.response?.data?.message ?? "";
+          } else {
+            errorMessage = error.message ?? "처리 중 오류가 발생했습니다.";
+          }
+          alert(errorMessage);
         },
       });
     } finally {
@@ -436,23 +443,15 @@ function FloatingActionButtons({
               결재(회신)
             </Button>
           )}
-          {shouldShowButton(INSTL_SNCN_VIEW_BUTTON_ACTION.grndsChck) && (
-            <Button
-              onClick={() =>
-                void executeAction({ action: INSTL_SNCN_VIEW_BUTTON_ACTION.grndsChck })
-              }
-              disabled={isProcessing}
-            >
-              기술검토
-            </Button>
-          )}
         </div>
       </div>
+
       <ElaprTmpltPickerDialog
         open={activeDialog === "elaprTmplt"}
         onClose={() => setActiveDialog(null)}
         onSelect={handleElaprTmpltSelect}
       />
+
       <TextInputDialog
         open={activeDialog === "dmndSplmnt"}
         onOpenChange={() => setActiveDialog(null)}
@@ -461,6 +460,7 @@ function FloatingActionButtons({
         isSubmitting={isProcessing}
         onConfirm={(value) => void handleDmndSplmntConfirm(value)}
       />
+
       <ElaprApprovalDialog
         open={activeDialog === "elaprApproval"}
         onOpenChange={(open) => setActiveDialog(open ? "elaprApproval" : null)}
@@ -480,18 +480,7 @@ function FloatingActionButtons({
 
 export { FloatingActionButtons };
 
-async function handleStrg(
-  context: ActionHandlerContext<InstlSncnApplySaveRequestDto>,
-): Promise<void> {
-  try {
-    await instlSncnService.saveApply(context.request);
-    context.onSuccess?.();
-  } catch (error) {
-    context.onError?.(error as Error);
-  }
-}
-
-async function handleAply(
+async function handleSaveApply(
   context: ActionHandlerContext<InstlSncnApplySaveRequestDto>,
 ): Promise<void> {
   try {
@@ -516,16 +505,7 @@ async function handleSplmntCmptn(context: ActionHandlerContext): Promise<void> {
   context.onSuccess?.();
 }
 
-async function handleInstlSncnAncmnt(context: ActionHandlerContext): Promise<void> {
-  try {
-    await instlSncnService.changePrgrsSttsComCd(context.request);
-    context.onSuccess?.();
-  } catch (error) {
-    context.onError?.(error as Error);
-  }
-}
-
-async function handleEnvoSbmsn(
+async function handleChangePrgrsSttsComCd(
   context: ActionHandlerContext<DocPrgrsUpdateRequestDto>,
 ): Promise<void> {
   try {
@@ -536,25 +516,7 @@ async function handleEnvoSbmsn(
   }
 }
 
-async function handleRjct(context: ActionHandlerContext<DocPrgrsUpdateRequestDto>): Promise<void> {
-  try {
-    await instlSncnService.changePrgrsSttsComCd(context.request);
-    context.onSuccess?.();
-  } catch (error) {
-    context.onError?.(error as Error);
-  }
-}
-
-async function handleSncnAprv(context: ActionHandlerContext): Promise<void> {
-  try {
-    await instlSncnService.changePrgrsSttsComCd(context.request);
-    context.onSuccess?.();
-  } catch (error) {
-    context.onError?.(error as Error);
-  }
-}
-
-async function handleRvwRply(
+async function handleTechReview(
   context: ActionHandlerContext<InstlSncnApplySaveRequestDto>,
 ): Promise<void> {
   try {
@@ -565,15 +527,6 @@ async function handleRvwRply(
   }
 }
 
-async function handleRqstTechRvw(context: ActionHandlerContext): Promise<void> {
-  try {
-    await instlSncnService.changePrgrsSttsComCd(context.request);
-    context.onSuccess?.();
-  } catch (error) {
-    context.onError?.(error as Error);
-  }
-}
-
 async function handleDsgntRvwr(
   context: ActionHandlerContext<ElaprDmndSaveRequestDto>,
 ): Promise<void> {
@@ -585,28 +538,6 @@ async function handleDsgntRvwr(
   }
 }
 
-async function handleRvwStrg(
-  context: ActionHandlerContext<InstlSncnApplySaveRequestDto>,
-): Promise<void> {
-  try {
-    await instlSncnService.techReview(context.data.detDto.instlSncnDocNo, context.request);
-    context.onSuccess?.();
-  } catch (error) {
-    context.onError?.(error as Error);
-  }
-}
-
-async function handleRvwCmptn(
-  context: ActionHandlerContext<InstlSncnApplySaveRequestDto>,
-): Promise<void> {
-  try {
-    await instlSncnService.techReview(context.data.detDto.instlSncnDocNo, context.request);
-    context.onSuccess?.();
-  } catch (error) {
-    context.onError?.(error as Error);
-  }
-}
-
 async function handleDmndSplmnt(context: ActionHandlerContext): Promise<void> {
   // TODO: 보완요청 API 호출
   context.onSuccess?.();
@@ -628,19 +559,19 @@ async function handleGrndsChck(context: ActionHandlerContext): Promise<void> {
 }
 
 const buttonActionHandlers: Record<InstlSncnViewButtonAction, ActionHandler> = {
-  strg: handleStrg,
-  aply: handleAply,
+  strg: handleSaveApply,
+  aply: handleSaveApply,
   del: handleDel,
   splmntCmptn: handleSplmntCmptn,
-  instlSncnAncmnt: handleInstlSncnAncmnt,
-  envoSbmsn: handleEnvoSbmsn,
-  rjct: handleRjct,
-  sncnAprv: handleSncnAprv,
-  rvwRply: handleRvwRply,
-  rqstTechRvw: handleRqstTechRvw,
+  instlSncnAncmnt: handleChangePrgrsSttsComCd,
+  envoSbmsn: handleChangePrgrsSttsComCd,
+  rjct: handleChangePrgrsSttsComCd,
+  sncnAprv: handleChangePrgrsSttsComCd,
+  rvwRply: handleTechReview,
+  rqstTechRvw: handleChangePrgrsSttsComCd,
   dsgntRvwr: handleDsgntRvwr,
-  rvwStrg: handleRvwStrg,
-  rvwCmptn: handleRvwCmptn,
+  rvwStrg: handleTechReview,
+  rvwCmptn: handleTechReview,
   dmndSplmnt: handleDmndSplmnt,
   atrzAprv: handleAtrzAprv,
   atrzRply: handleAtrzRply,