L-1011 Trainer Installation: Instrument Lighting Continuation

L-1011 Trainer: Instrument Lighting

We finally received some of the parts that needed to continue the power-up of the integral instrument lighting on the main instrument panel. Also, I have been pretty busy the last two weeks working on our Boeing 727 to get it ready for the Museum Gala on September 14th 2013. 

The instrument lighting for the L-1011 main instrument panel is split into a number of 5V power buses. Each of the buses has a discrete power supply and a breaker associated with it. The buses are:

1. Captain's Instrument Lighting Left
2. Captain's Instrument Lighting Right
3. Center Instrument Lights Left (actually they are more top)
4. Center Instrument Light Right (bottom)
5. F/O's Instrument Lighting Left
6. F/O's Instrument Lighting Right 

What you see in the pictures and the short video below are instruments powered from the Center Instrument Lighting buses. 

L-1011 Trainer: Instrument Lighting

A short demonstration video of the breaker controlled light buses:

L-1011 Trainer Installation: Airspeed and ADI Power-UP

L-1011 Trainer - A/S and ADI Power-Up

Both the Airspeed Indicator and the ADI are Synchro driven instruments. So simply supplying power to them doesn't really do all that much, however, it's all part of the power-up process. In the video below you can see that the Airspeed indicator does not quite know how to display a Mach number since we are not feeding speed and altitude data to it quite yet, and the ADI clears the R/O flag and the GATE flag. As we start producing valid signals with the compute all the flags will clear and the instruments will start displaying simulator data.

L-1011 Trainer Installation: Engine Oil Pressure - Power-Up and BITE

L-1011 Trainer: Engine Oil Pressure Power-Up and BITE

The engine oil pressure indicators on the Lockheed L-1011 are manufactured by Smiths Industries Ltd., and have a range of 0 to 100psi. The three indicators have a common test switch located on the panel between the No. 2 and No. 3 indicator position.

The Built In Test (BITE) dries the indicators to display roughly 22 to 24 psi.

Below is a short video showing the Engine Oil Pressure indicators and the BITE test. Unfortunately the Engine 2 Oil Pressure Indicator is damaged and we need to fix and/or replace it.

L-1011 Trainer Installation: %RPM N3 Power-Up and BITE

L-1011 Trainer - %RPM N3 Power-Up

The %RPM N3 indicators receive 115VAC, 400Hz power from the AC Standby Bus. So they are part of the essential engine instrumentation. The indicator has an Overlimit Painter that will record any overspeed condition. The pointer will remain at overspeed indication until 28VDC is supplied to the Reset Solenoid in the instrument. Current, we have not connected the reset circuit quite yet ... but it will be one of the next things.

BITE: Depressing the Test switch on the lower left hand side of the indicator face should cause the pointer and counter to read 64.0%

Below is a short video showing the indicator BITE in action:

%RPM N! and N3 from Delta L-1011 Pilot's Reference