diff --git a/src/features/online-board/components/FlightSchedule/DaysOfWeekStrip.test.tsx b/src/features/online-board/components/FlightSchedule/DaysOfWeekStrip.test.tsx
index 91d43641..7240686a 100644
--- a/src/features/online-board/components/FlightSchedule/DaysOfWeekStrip.test.tsx
+++ b/src/features/online-board/components/FlightSchedule/DaysOfWeekStrip.test.tsx
@@ -42,4 +42,38 @@ describe("DaysOfWeekStrip", () => {
     expect(screen.getByTestId("day-of-week-0").textContent).toContain("DAYS.1");
     expect(screen.getByTestId("day-of-week-6").textContent).toContain("DAYS.7");
   });
+
+  // TZ §4.1.16.8: position 0 = Monday (first ISO weekday), position 6 = Sunday
+  // Verify the Mon/Wed/Fri pattern used by typical schedule flights ("Пн Ср Пт" = "1010100")
+  it("Mon/Wed/Fri pattern: positions 0,2,4 active; 1,3,5,6 inactive", () => {
+    render(<DaysOfWeekStrip flightBitString="1010100" />);
+    // Active: Mon(0), Wed(2), Fri(4)
+    expect(screen.getByTestId("day-of-week-0").className).not.toMatch(/--inactive/);
+    expect(screen.getByTestId("day-of-week-2").className).not.toMatch(/--inactive/);
+    expect(screen.getByTestId("day-of-week-4").className).not.toMatch(/--inactive/);
+    // Inactive: Tue(1), Thu(3), Sat(5), Sun(6)
+    expect(screen.getByTestId("day-of-week-1").className).toMatch(/--inactive/);
+    expect(screen.getByTestId("day-of-week-3").className).toMatch(/--inactive/);
+    expect(screen.getByTestId("day-of-week-5").className).toMatch(/--inactive/);
+    expect(screen.getByTestId("day-of-week-6").className).toMatch(/--inactive/);
+  });
+
+  // TZ §4.1.16.8: Sat/Sun only ("0000011")
+  it("weekend-only pattern: positions 5,6 active; 0-4 inactive", () => {
+    render(<DaysOfWeekStrip flightBitString="0000011" />);
+    for (let i = 0; i < 5; i++) {
+      expect(screen.getByTestId(`day-of-week-${i}`).className).toMatch(/--inactive/);
+    }
+    expect(screen.getByTestId("day-of-week-5").className).not.toMatch(/--inactive/);
+    expect(screen.getByTestId("day-of-week-6").className).not.toMatch(/--inactive/);
+  });
+
+  // TZ §4.1.16.8: single-day operation (Tuesday only = "0100000")
+  it("Tuesday-only pattern: position 1 active; all others inactive", () => {
+    render(<DaysOfWeekStrip flightBitString="0100000" />);
+    expect(screen.getByTestId("day-of-week-1").className).not.toMatch(/--inactive/);
+    for (const i of [0, 2, 3, 4, 5, 6]) {
+      expect(screen.getByTestId(`day-of-week-${i}`).className).toMatch(/--inactive/);
+    }
+  });
 });
diff --git a/src/features/online-board/components/FlightSchedule/FlightSchedule.test.tsx b/src/features/online-board/components/FlightSchedule/FlightSchedule.test.tsx
index 30377ff5..db547156 100644
--- a/src/features/online-board/components/FlightSchedule/FlightSchedule.test.tsx
+++ b/src/features/online-board/components/FlightSchedule/FlightSchedule.test.tsx
@@ -1,6 +1,6 @@
 // @vitest-environment jsdom
 import { describe, it, expect, vi } from "vitest";
-import { render, screen } from "@testing-library/react";
+import { render, screen, fireEvent } from "@testing-library/react";
 import { FlightSchedule } from "./FlightSchedule.js";
 import type { ISimpleFlight } from "../../types.js";
 
@@ -157,4 +157,50 @@ describe("FlightSchedule", () => {
     // '2ч. 30мин.' via formatDuration in ru locale.
     expect(screen.getByText("2ч. 30мин.")).toBeTruthy();
   });
+
+  // TZ §4.1.16.8: uses daysOfWeek.flight (schedule days), not .current (today's active day)
+  it("uses daysOfWeek.flight bitstring for active days, not .current", () => {
+    // current = daily, flight = Mon/Wed/Fri only ("1010100")
+    const flight = makeFlight({
+      daysOfWeek: { current: "1111111", flight: "1010100" },
+    });
+    render(<FlightSchedule flight={flight} />);
+    // Mon(0), Wed(2), Fri(4) should be active
+    expect(screen.getByTestId("day-of-week-0").className).not.toMatch(/--inactive/);
+    expect(screen.getByTestId("day-of-week-2").className).not.toMatch(/--inactive/);
+    expect(screen.getByTestId("day-of-week-4").className).not.toMatch(/--inactive/);
+    // Tue(1), Thu(3), Sat(5), Sun(6) should be inactive
+    expect(screen.getByTestId("day-of-week-1").className).toMatch(/--inactive/);
+    expect(screen.getByTestId("day-of-week-3").className).toMatch(/--inactive/);
+    expect(screen.getByTestId("day-of-week-5").className).toMatch(/--inactive/);
+    expect(screen.getByTestId("day-of-week-6").className).toMatch(/--inactive/);
+  });
+
+  // TZ §4.1.16.8: collapsible accordion — open by default, toggles
+  it("accordion is expanded by default and collapses on click", async () => {
+    const flight = makeFlight({
+      daysOfWeek: { current: "1111111", flight: "1111111" },
+    });
+    render(<FlightSchedule flight={flight} />);
+    const header = screen.getByRole("button");
+    // Days strip is visible initially
+    expect(screen.getAllByTestId(/^day-of-week-\d$/).length).toBe(7);
+    // Click to collapse
+    fireEvent.click(header);
+    expect(screen.queryAllByTestId(/^day-of-week-\d$/).length).toBe(0);
+  });
+
+  // TZ §4.1.16.8: week note uses departure local date, not arrival or UTC
+  it("week note is derived from first-leg scheduled departure local time", () => {
+    // dep = 2026-04-20 (Monday) → week is 20.04.2026 – 26.04.2026
+    const flight = makeFlight({
+      daysOfWeek: { current: "1111111", flight: "1111111" },
+      depLocal: "2026-04-20T08:00:00",
+      arrLocal: "2026-04-20T11:00:00",
+    });
+    render(<FlightSchedule flight={flight} />);
+    const note = screen.getByTestId("flight-schedule-note");
+    expect(note.textContent).toContain("20.04.2026");
+    expect(note.textContent).toContain("26.04.2026");
+  });
 });
diff --git a/src/features/online-board/components/FlightSchedule/weekDateRange.test.ts b/src/features/online-board/components/FlightSchedule/weekDateRange.test.ts
index 920bcde1..0e1112bb 100644
--- a/src/features/online-board/components/FlightSchedule/weekDateRange.test.ts
+++ b/src/features/online-board/components/FlightSchedule/weekDateRange.test.ts
@@ -28,4 +28,40 @@ describe("getWeekDateRange", () => {
   it("returns empty strings for undefined input", () => {
     expect(getWeekDateRange(undefined)).toEqual({ start: "", end: "" });
   });
+
+  // TZ §4.1.16.8: week range must be calendar week Mon–Sun (ISO week)
+  // Verify that the range spans exactly 6 days (Sun - Mon = 6 day delta)
+  it("end date is always exactly 6 days after start date", () => {
+    const cases = [
+      "2026-04-15T10:00:00",  // Wednesday
+      "2026-04-13T00:00:00",  // Monday
+      "2026-04-19T23:59:59",  // Sunday
+      "2026-01-01T12:00:00",  // New Year's Day
+    ];
+    for (const iso of cases) {
+      const { start, end } = getWeekDateRange(iso);
+      const [sd, sm, sy] = start.split(".").map(Number);
+      const [ed, em, ey] = end.split(".").map(Number);
+      const startMs = new Date(sy!, sm! - 1, sd!).getTime();
+      const endMs = new Date(ey!, em! - 1, ed!).getTime();
+      const daysDiff = Math.round((endMs - startMs) / 86400000);
+      expect(daysDiff).toBe(6);
+    }
+  });
+
+  // TZ §4.1.16.8: "dd.MM.yyyy" format (leading zeros required)
+  it("formats dates with leading zeros", () => {
+    // 2026-01-05 is a Monday
+    const { start, end } = getWeekDateRange("2026-01-05T10:00:00");
+    expect(start).toBe("05.01.2026");
+    expect(end).toBe("11.01.2026");
+  });
+
+  // TZ §4.1.16.8: week starts on Monday (ISO standard)
+  it("Saturday input yields same Mon–Sun week as adjacent Monday", () => {
+    const sat = getWeekDateRange("2026-04-18T10:00:00");  // Saturday
+    const mon = getWeekDateRange("2026-04-13T10:00:00");  // Monday of same week
+    expect(sat.start).toBe(mon.start);
+    expect(sat.end).toBe(mon.end);
+  });
 });