The Goodrich Isolated Fuel Quantity Transmitter (IFQT) is specifically designed to meet the requirements of Airworthiness Directives 98-20-40 and 99-03-04 for Boeing 747 Classic and 737 Classic aircraft.  The IFQT's are designed to limit energy and current from entering aircraft fuel tanks while preserving the operation of the existing fuel quantity measurement systems. This is achieved by physically inserting the IFQT in series with the existing fuel quantity wiring. Utilizing the latest technology available in fuel tank safety, the IFQT precisely measures the fuel quantity using existing in-tank hardware. The fuel quantity data is passed through an isolation barrier to special circuitry that drives the existing fuel quantity hardware to display the correct fuel quantity.

Benefits

• High reliability
  
• MTBF of > 60,000 hours
  
• No special test equipment required
  
• Does not affect system Built-in-Test
  
• Supports auxiliary tanks
  
• Boeing Type Certificate
  
• Minimizes operator costs
  
• Uses existing in-tank hardware, flight deck indicators and refuel indicators

Features

• Retrofit Kits in accordance with AD 99-03-04
  
• Latest technology in fuel tank safety
  
• Prevents energy from entering fuel tank
  
• Utilizes the same proven fuel gauging technology as the latest 737 aircraft
  
• Master minimum equipment list remains the same for the fuel gauging system
  
• Airplane can dispatch with a failed FQIS channel

Applicability

• Boeing 747 -100, 200, 300
• Boeing 737 - 100, 200, 300. 400, 500

Boeing type certified fuel quantity indicating systems

• Smiths 2300 Digital FQIS
• Smiths 2120 Digital FIQS
• Goodrich Digital FQIS
• Goodrich Analog FQIS