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| L-1011 Fuel Consumption Indication System |
The Engine Fuel Consumption indicator in the L-1011 cockpit consists of two instruments. The "Fuel Used" instrument located on the Second Officers lower console and the "Fuel Flow" (FF) instrument located on the main instrument panel. There is one of these instrument combinations for each engine.
The instrument on the right is the Fuel Used indicator which receives signals from the fuel flow meter installed as part of the engine fuel flow system. The signals received from the sensors are then routed through the Fuel Used instrument to the Fuel Flow instrument shown on the left in the image above.
Fuel Used Schematic
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| From Lockheed L-1011 WDM, 1981 |
The Fuel Used Instrument is a GE 8DJ171 LWA 3
Fuel Flow Schematic
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| From Lockheed L-1011 WDM, 1981 |
The Fuel Flow Instrument is a GE 8DJ170 LWA 1
Typically on the L-1011 every instrument has a test switch right on the instrument that drives the indicator to a predefined position. However, as you can see, the Fuel Flow instrument (on the left) does not have a test switch, because, it is tested via the Fuel Used instrument.
Below is a short video the shows the test of the Fuel Used and attached Fuel Flow instrument using the two position test switch on the Fuel Used Instrument
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