L-1011 Navigation: 12 Hour Clock (34-14)

There are two 12-hour electric clocks, one on the Captains instrument panel and one on the first officers' instrument panel. On some Lockheed L-1011's a digital type clock was installed in place of the 12 hour clocks. In most cases the clock installed on the flight engineer station was either a digital style clock or a 24h clock. The clock is set normally with the SET or GMT knob. The SWP knob on the 12h clock has the following functions:

• Press first time up to 12 minutes of sweep
• Press second time to reset the sweep time