L-1011 Procedure: Preflight Check - Engine Status Panel, Clock and APU

From Lockheed L-1011 

Engine Status Panel

• Airborne Vibration Monitor: With the selector switch in NORM, test the vibration monitor by first latching in the FAN switch and pressing the Test Switch. Then unlatch the FAN switch latch in the TURB switch. This checks Airborne Vibration Monitor (AVM) system and indicators. Indicator pointers should drive to approximately 4 Units. The vibration caution lights (in each indicator) should illuminate at 2 1/2 units, and the ENG/APU STATUS annunciator on the master caution/warning panel should illuminate. Unlatch TURB switch. 
• Check N2 indicators show zero and the overspeed indicators are at 100%.
• Reverser pressure lights should be extinguished. 

Clock

• Set the clock to the correct time.

APU

• Check APU for normal operation. NG and TGT indicators are in the green band when the APU is running. 

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

Avionics Bending: Chronometer / Clock (Analysis)

The clock/chronometer that I picked for the Lockheed L-1011 project was used on many different aircraft types, including the L-1011. The pair of clocks that I use for the main instrument panel are sourced from a Boeing 737.

The chronometer is a beautiful old analog instrument that uses stepper motors for both the GMT time as well as the sweeping second hand. Below is a description of the clock controls.


The top picture of the instrument shows the two tapes. The top tape is for hours on a 24h clock and the bottom tape displays minutes. The tape is advanced by a sprocket mechanism that is similar to that in an old film camera.

1) Top View


2) Left Side


3) Bottom



4) Right hand side.


There are several versions of this clock, below is a pin-out that applies this this particular clock only:

Pin 1 -> Integral Lighting 5V DC or AC
Pin 2 -> Integral Lighting 5V DC or AC
Pin 3 -> Instrument Power 24-28VDC
Pin 4 -> Instrument Power GND
Pin 5 -> Instrument Case Ground
Pin 6 -> Chrono Generator Phase 1
Pin 7 -> Chrono Generator Phase 2
Pin 8 -> Remote Switch 1
Pin 9 -> Remote Switch Common (12V-15V)
Pin 10 -> Remote Switch 2