![]() Its temperature then rises and its resistance decreases. NO BREAK - WORK HARDER When the fuel quantity falls below the 20 percent level, the thermistor in the low fuel sensor is no longer cooled by fuel. NO BREAK - WORK HARDER The low level sensing system includes a dual thermistor control unit in the console, a low level sensor in each center tank unit at the 20 percent level, and two capsules, L or R FUEL LOW in the master caution panel. The indicator is powered by 115 vac and electrical connection is through a connector at the rear of the indicator. NO BREAK - WORK HARDER The rear of the indicator contains four adjustments for full and empty calibration, two for the dial and two for the digital readout. The variable resistor wiper arm is mechanically linked to a counter mechanism which displays the total fuel quantity in pounds. ![]() A printer on the wiper shaft moves across the calibrated scale and indicates the quantity in single-tank quantity indication. The servo motor moves a variable resistor wiper arm thru reduction gears to reestablish the bridge balance. This signal is amplified to drive a servo motor. The unbalance results in a gage correction signal at the bridge output. This causes an unbalance in the fuel quantity indicator bridge circuit. A change in fuel level causes a change in the capacitance of the tank units. NO BREAK - WORK HARDER The indicating system includes the fuel quantity selector switch and indicator clamp mounted on center instrument panel, and ten tank units, one in each forward or aft aux tank and three in each main tank. Eliminating electricity from the fuel tank is safer and insures a lifetime of trouble-free operation providing stable, consistent fuel level output.TM 55-1520-240-23-7 8-57 MISCELLANEOUS INSTRUMENTS (Continued) 8-57 FUEL QUANTITY INDICATING SYSTEM Description This system includes the fuel quantity indicating system and a low level sensing system. The non-contact measurement method eliminates electrical contact with the fuel that is prevalent in resistive or capacitance systems. This patented sensor system allows fuel measurements down to a 100th of a gallon. The CiES digital fuel quantity system utilizes an advanced technology non-contact sensor system that allows repeatable, reliable and accurate measurement of fuel in the aircraft fuel tank. CiES has the experience and capability to ensure that GA aircraft fuel quantity can and will be accurate in the general aviation aircraft of the future. This safety feature is important as the new Garmin Txi EIS system is approved only for Resistive and CiES digital senders, due to the lightning certification issues in legacy aircraft capacitive fuel quantity wiring and probes.ĬC284022 Series Fuel quantity senders have amassed over 890,000 hours of operation in OEM aircraft and have an outstanding record of a handful of in-service removals with over 24,000 senders fielded. Our non-contact design eliminates the certification concerns with lightning protection for the aircraft fuel tank, as the CiES design eliminates electronic components exposed to the fuel environment. There is no need for an expensive Barfield Tester for diagnosis, the CiES fuel quantity system can be diagnosed with a simple Digital MultiMeter. Our system carries an internal signal conditioner on each sender eliminating weight, complexity and picofarad fussiness of legacy capacitive fuel quantity systems and their separate fuel conditioner boxes. ![]() In replacing the capacitive systems on the later and larger Cessna Twins, the many benefits of CiES technology become evident. This group of new AML approvals illustrates the flexibility and safety of our superior non-contact technology. CiES is the vender of choice for many OEM aircraft programs and now the preferred supplier for most retrofit solutions. CiES has gained the preeminent position in GA fuel quantity system knowledge and design. The CiES patented fuel sender technology is a digital non-contact method designed exclusively for aircraft and the aircraft operating environment. CiES is also FAA approved as a retrofit in Garmin G1000, G2000 and Rochester Gauges round gauge equipped aircraft. fuel quantity senders are now FAA approved for STC installation in Cessna 310, 320, 340, 401, 402, 406, 411 414, 421, T303 and the 208 Caravan CiES CC284022 Series & STC SE02511SE UpdateĪll of these new AML approvals and the existing AML listings are approved for interface with the new Garmin Txi EIS retrofit system, as well as JPI, Aerospace Logic and Electronics International Engine and Fuel Instrument displays.
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