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The AIMS reads the fuel flow data on the systems ARINC 629 data buses. The primary display system (PDS) uses this data to show the fuel flow rate on the secondary engine display and performance maintenance page. 

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PW4000 SERIES ENGINES

777 AIRCRAFT MAINTENANCE MANUAL

ENGINE FUEL INDICATING -FUEL FLOW

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ENGINE FUEL INDICATING -FUEL FILTER BYPASS WARNING

General
The fuel filter bypass warning system supplies a discrete signal to the EEC when the fuel filter is about to bypass. The PDS shows a bypass status message in the flight deck.
Fuel Filter Differential Pressure Switch
The fuel pump filter differential pressure switch attaches to the right side of the fuel pump above the filter housing. The switch senses fuel pressure before and after the fuel flows through fuel filter. The switch closes at a differential pressure below the pressure that the filter bypass valve opens.
The differential pressure switch is a LRU.
Functional Description
Before the fuel filter bypass valve opens the fuel pump filter differential pressure switch closes. This sends a discrete signal to the EEC. The EEC sends the signal to the EDIU.
The PDS reads the data and shows a fuel filter bypass message on the status display.
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ENGINE FUEL INDICATING -FUEL FILTER BYPASS WARNING

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本文鏈接地址：777 AMM 飛機維護手冊 發(fā)動機和燃油控制 Engine Fuel and Control PW 777 AIRCRAFT MAINTENANCE MANUAL(25)