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™
Microflo-L
Digital Fuel
Management System
with interface to LORAN-C and GPS receivers with
RS-232 output format
OPERATING MANUAL
Single and Twin Engine Indicators
For P/N: 91204XT-38-D
Shadin
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TABLE OF CONTENTS 1. GENERAL DESCRIPTION ..........................................................................3 1.1 THE SYSTEM PROVIDES .........................................................................4 1.1.1 SPECIFIC RANGE............................................................................4 1.1.2 FUEL TO DESTINATION................................................................4 1.1.3 FUEL RESERVE......................................................................
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3.2.1 NOT ENOUGH FUEL.....................................................................14 3.2.2 RESERVE FUEL WILL BE USED.................................................14 3.2.3 LOW ENDURANCE.......................................................................14 3.2.4 LOW FUEL REMAINING..............................................................14 3.3 BRIGHTNESS CONTROL .......................................................................15 4. EMERGENCY PROCEDURES...............
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™ Microflo-L Although not required by the FAA, it is recommended that this manual be attached to the FAA-approved Flight Manual, or always kept on board for reference. 1. GENERAL DESCRIPTION Microflo-L™ is a Digital Fuel Management System designed to provide complete fuel management information under real flight conditions without any manual entry of data (after entry of the initial fuel on board information). Microflo-L™ is connected to the engine fuel flow transducer for fue
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1.1 THE SYSTEM PROVIDES 1.1.1 SPECIFIC RANGE Specific Range (NM/GAL) = Ground Speed (Kt.)/Fuel Flow per hour. This is an indication of how efficient the cruise is and the optimum cruise speed can be determined by selecting the power setting, which yields the highest nautical miles per gallon. 1.1.2 FUEL TO DESTINATION Microflo-L™ calculates (under real wind conditions) the fuel necessary to reach the destination as selected on the Loran-C or GPS receiver by multiplying the fuel
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1.1.5 FUEL FLOW The system provides a digital readout of the fuel per hour to a tenth of a gallon up to 100 gallons and to the nearest gallon above 100 gallons. For the pounds version, the readout is to the nearest pound up to 999 lbs./hour and to the nearest 10 lbs. above 999 lbs./hour. 1.1.6 FUEL USED The system keeps track of the fuel used since the last fuel entry or reset. 1.1.7 FUEL REMAINING The system keeps track of the fuel remaining on board. Fuel Remaining is equal to
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1.2 SYSTEM COMPONENTS The system consists of three (3) basic units: the fuel flow transducer, the navigation receiver (Loran-C or GPS) and the panel mounted unit. 1.2.1 FUEL FLOW TRANSDUCER The fuel flow transducer mounted in the fuel line measures the flow of fuel and generates electrical pulses directly proportional to the fuel flow. The transducer is fail-safe designed, and stopped rotor will not interrupt fuel flow to the engine. 1.2.2 LORAN-C OR GPS RECEIVER The Loran-C o
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1.3 TEST FUNCTION Diagnostic software is built into the system. To activate it, press the ENTER/TEST button until all of the display digits fill with a checkerboard pattern, and then release it. This display will flash on and off three (3) times. Next, all digits will be filled with a second checkerboard pattern, the inverse of the first, which will also flash on and off three (3) times. Careful monitoring of these patterns will verify operation of every element of the display unit
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2. PREFLIGHT PROCEDURES MICROFLO-L is a fuel flow measuring system and NOT a quantity-sensing device. A visual inspection and positive determination of the usable fuel in the fuel tanks is a necessity. Therefore, it is imperative that the determined available usable fuel be manually entered into the system. 2.1. INITIAL PROGRAMMING The function of initial programming is to enter the total usable fuel into the memory. It can then be recalled whenever the fuel tanks are filled
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6. After reaching the correct total usable fuel figure, press the ENTER/TEST button and the computer will store that number as full fuel. The word “FUL” disappears and the computer will return to the operating mode. Release the ADD/FULL toggle switch. 7. To verify that the data is stored properly, press the ENTER/TEST button. The computer will run a diagnostic check and then display “GOOD”. If the test is successful, it will display the maximum usable fuel. NOTE: Do not turn the
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Move the USED/REM toggle switch to the REM position. The system will display the fuel remaining on board. The pilot should confirm this figure with the actual fuel on board. 2.3 NO FUEL ADDED This automatically stores information concerning previous fuel levels, even in the case of a power down. If no fuel is added, no action is needed in updating fuel data. 2.4 FUEL TANKS FULL There are two methods to enter full fuel: the ramping method and the ADD/FULL toggle switch method.
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2.5 PARTIAL FUEL ADDED There are two methods to enter partial fuel: Ramping Method Add the amount of fuel from the refueling meter to the amount of fuel remaining. Enter the total using the following steps: 1. Move USED/REM toggle switch to REM position and hold. 2. Press and hold ENTER/TEST button to increment fuel remaining until figure to be entered is reached; then release button. 3. Release the USED/REM toggle switch. The displayed figure is entered into memory as fuel rema
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switch in the USED position and use the ENTER/TEST button to control the decrementing. Note: Adding or subtracting fuel by any method resets the fuel used value to zero. 3. INFLIGHT OPERATIONS 3.1 INSTRUMENT OPERATION 3.1.1 FUEL FLOW For Single Engine Aircraft: FUEL FLOW is displayed continuously on the left display window. For Twin Engine Aircraft: Total fuel flow is displayed continuously on the left side of the display window. To read each engine’s fuel flow individua
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3.1.5 NAUTICAL MILES PER GALLON Nautical miles per gallon is selected by rotating the rotary switch to the NM/GAL position. The information is shown on the right display window. 3.1.6 FUEL TO DESTINATION Fuel to destination is selected by rotating the rotary switch to the FUEL TO DEST. position. The information is shown on the right display window and represents the fuel needed to reach either the active waypoint selected on the Loran-C (or GPS receiver) or the final destination
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3.2 WARNINGS 3.2.1 NOT ENOUGH FUEL When the rotary switch is in FUEL TO DEST. position, the information in the display window flashes if fuel on board is insufficient to reach either the destination selected as the active waypoint or the final destination (if that total distance record is provided in the serial message). Display window shows amount of fuel short to reach destination preceded by a negative sign. 3.2.2 RESERVE FUEL WILL BE USED With the rotary switch is in F. AT DEST
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3.3 BRIGHTNESS CONTROL The display brightness is controlled by the BRIGHT/DIM toggle switch. Moving the BRIGHT/DIM toggle switch to BRIGHT repeatedly will make the display brighter; moving it to DIM repeatedly will dim the display. The default brightness after power up is full brightness. 4. EMERGENCY PROCEDURES In case of electrical power failure in-flight, the instrument will cease to function. After restoring power, the system will resume accurate fuel flow reading, but
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5. ERROR MESSAGES ERROR 1: Dues to the necessity of Group 1 settings, if the Flow Meter is set to Operate Mode and the checksum of Group 1 is bad, the display will flash: E1. This refers to Error 1, Group 1. The flow meter will not continue to function after this point, and will continue flashing E1, alerting the flow meter must be serviced. ERROR 2: The Flow Meter will still be accurate and operate under NON- LORAN pages if the checksum of Group 2 is bad. In this case, un
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6. CONFIGURATION DATA ENTRY Manual Entry Mode Ordinarily, the fuel flow indicator has been set up by the factory to match the K-factor of the supplied transducers and other set-up information. However, there are built-in provisions to change the set-up. Please be sure to define and document initial set-up before attempting to make changes. Overview Previously, all settings depended upon the switches mounted on the processor board. Currently, the Microflo-L™ processor boar
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Group 1: Generally, Group 1 is set up by the distributor and contains information defined by the part number. However, although functions are defined here, do not change them without proper knowledge or they will affect performance of the indicator. Group 2: Group 2 must be set up by programming the unit in Manual Entry Mode. Group 2 settings allow the user or installer to change Loran or GPS input and output parameters, endurance warning time, and fuel flow filtering types. 18
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Locations of the switches for the Microflo are as follows: F A C Component side of board E P L SW1 SW2 SW3 SW4 Board Edge A T E Each switch has 16 positions, 0-9, A, B, C, D, E, F. Operation Mode vs. Entry Mode FE: If Switch 1 is set to F and Switch 2 is set to E, the unit is in Entry Mode. This is the only mode that will allow the setting of Group 1 values onto the non-volatile memory of the unit. In this mode, both groups can be set. Once installed in the aircra
