EPU 11.01.2003  

Emergency Power Unit

If an engine failure occurs, the Emergency Power Unit (EPU) starts automatically in order to provide the plane with the required hydraulic pressure of the primary system. The EPU can run for about 10 minutes due to an own fuel reserve (see EPU Fuel Indicator). When the EPU is running hydraulic system B is inoperative. When the EPU has no more fuel, both hydraulic systems fail, making the flying of the A/C impossible. Under these conditions ejection should be done. This panel is located on the left console.

The panel and his elements
Pictures from the Emergency Power Unit Panel

The panel and his elements


Element Type Position Information
EPU 3-Way switch
(Safety bar)
ON Start the EPU manual
NORMAL (Safe) EPU will start and run automatically
OFF EPU doesn't run exept when no generator present
Status light Light
  On, if EPU is active
Status light 2-Status light
HYDRAZN On, if EPU is consuming Hydrazine fuel rather than running off engine pressure
AIR On, if the EPU has been commanded to run

The showed panel drawing is a drawing with can be downloaded from my page Documents, plans and diagrams from the F-16.

Pictures from the Emergency Power Unit Panel

To zoom please select the picture with your mouse.

Picture No. 3 was provided by Kostas Kefalas.

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