Shadin Digiflo-L Manuale utente

Digiflo-L

Digital Fuel

Management System

RS-232 and RS-422 output format

with interface to LORAN-C and GPS receivers

OPERATING MANUAL

Single and Twin Engine Indicators

For P/N: 91053XP

Shadin Co., Inc.

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....................................................................................4

1.1.4 ENDURANCE.........................................................................................4

1.1.5 FUEL FLOW ...........................................................................................5

1.1.6 FUEL USED............................................................................................5

1.1.7 FUEL REMAINING..............................................................................5

1.2 SYSTEM COMPONENTS....................................................................................6

1.2.1 FUEL FLOW TRANSDUCER............................................................6

1.2.2 LORAN-C OR GPS RECEIVER.........................................................6

1.2.3 PANEL MOUNTED UNIT...................................................................6

1.3 TEST FUNCTION...................................................................................................7

2. PREFLIGHT PROCEDURES.................................................8

2.1 INITIAL PROGRAMMING.................................................................................8

2.2 PREFLIGHT CHECK............................................................................................9

2.3 NO FUEL ADDED .................................................................................................10

2.4 FUEL TANKS FULL.............................................................................................10

2.5 PARTIAL FUEL ADDED ....................................................................................11

2.6 CORRECTING FUEL ON BOARD ENTRY ERROR................................12

3. INFLIGHT OPERATIONS....................................................13

3.1 INSTRUMENT OPERATION...........................................................................13

3.1.1 FUEL FLOW .........................................................................................13

3.1.2 FUEL USED..........................................................................................13

3.1.3 FUEL REMAINING............................................................................13

3.1.4 ENDURANCE.......................................................................................13

3.1.5 NAUTICAL MILES PER GALLON ................................................13

3.1.6 FUEL TO DESTINATION.................................................................13

3.1.7 FUEL RESERVE..................................................................................14

3.2 WARNINGS ............................................................................................................15

3.2.1 NOT ENOUGH FUEL.........................................................................15

3.2.2 RESERVE FUEL WILL BE USED ..................................................15

3.2.3 LOW ENDURANCE...........................................................................15

3.2.4 LOW FUEL REMAINING.................................................................15

4. EMERGENCY PROCEDURES...........................................16

5. ERROR MESSAGES............................................................16

6. CONFIGURATION DATA ENTRY.....................................17

7. SPECIFICATIONS ................................................................23

8. WARRANTY INFORMATION .............................................25

NOTE: Though references are made in this manual to fuel measured

in gallons, the information applies equally to measurements in

pounds, kilos, or liters.

Digiflo-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

Digiflo-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).

Digiflo-L is connected to the engine fuel flow transducer for fuel

flow information and to the Loran-C or GPS receiver serial port for

navigation data (ground speed, distance and estimated time en

route).

This system is also capable of transmitting the fuel information to

the Bendix/King KLN-88, KLN-90, and Garmin GPS navigation

receivers, for additional calculations and display of fuel

management data.

Digiflo-L is set up to measure the flow of fuel in either gallons,

liters, or pounds, and it can be installed on virtually any

reciprocating or turbine engine by selecting the proper size fuel

flow transducer.

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

NM/GAL, NM/10LB, or NM/5LIT of fuel burned.

1.1.2 FUEL TO DESTINATION

Digiflo-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 flow by the

estimated time en route to the destination. (If an

intermediate waypoint is selected for navigation purposes,

the displayed fuel to destination represents the fuel needed

to reach the intermediate waypoint unless the distance to the

destination is in the serial message.)

1.1.3 FUEL RESERVE

Digiflo-L calculates the amount of fuel, which will be

available on board when the aircraft reaches the destination

or waypoint indicated on the Loran-C or GPS receiver. This

feature provides the pilot with accurate information so that

the reserve fuel situation can be evaluated and action can be

taken if necessary. (If an intermediate waypoint is selected

for navigation purposes, the displayed fuel reserve

represents the fuel reserve at the intermediate waypoint

unless the distance to the destination is in the serial

message.) Fuel Reserve = Fuel Remaining –Fuel to Reach

Destination.

1.1.4 ENDURANCE

Digiflo-L calculates the time left to fly in hours and minutes

based on the fuel remaining and the present fuel flow.

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 Initial Starting Fuel minus Fuel Used.

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 or GPS receiver provides ground speed,

distance, and estimated time en route through the serial port.

1.2.3 PANEL MOUNTED UNIT

All system electronics, function controls, and digital

displays are contained in a single instrument that mounts in

a standard 3 1/8” dia x 6.5” Deep opening. This unit

requires no periodic maintenance, adjustment, or calibration

once it is properly installed.

The Display: The fuel flow is always displayed on the lower

windows. All other functions, with the priority for the rotary switch

functions, are displayed on the upper window.

System Memory: The system includes a non-volatile memory that

retains fuel remaining and fuel used information when the power to

the unit is shut down.

1.3 TEST FUNCTION

Diagnostic software is built into the system. To activate it, press

the TEST/ENTER button and hold until “8’s” begin to appear

across the display windows and then release. If the test is

successful, the word “Good” will appear on the upper display

window for three seconds. If the test is not successful, the word

“bAd” and an error message identifying the error will be displayed.

In such case, the unit will cease to function and must be considered

unserviceable until corrective action is taken.

At the end of the test routine the system will display the following:

1. In the twin engine models the left lower window displays

the K-factor for the left engine, and the right lower window

displays the K-factor for the right engine. The next screen

displays the right engine K-factor again. This number must

match the pulse count stamped on the fuel flow transducer

otherwise all the readout will be inaccurate. The units (Gal,

LB5.8, LB6.7, etc) display in the upper window.

2. The distance to waypoint or destination is displayed on the

upper window as shown on the Loran-C or GPS receiver to

check the Data Interface Integrity (not available without

signal).

If the system is not capable of reading the navigational

receiver data, the word “LbAd” will be displayed on the

upper window. If the Loran-C or GPS receiver is turned off,

the display shows “LoFF”. The lower left window displays

the Loran-C or GPS type.

3. “FUL” appears in the lower left window and the maximum

usable fuel in the upper window.

4. Software version and revision level in the lower windows.

Note: Using the test function while engines are running will cause

the computer to lose 17 seconds of fuel count.

2. PREFLIGHT PROCEDURES

Digiflo-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 up to the maximum usable fuel. The “FUL” fuel setting

determines the maximum amount of fuel that can be entered by any

method into the Digiflo-L.

PROCEDURE:

1. Power the unit up.

2. Move the FULL/ADD toggle switch to the FULL position

and hold for the entire procedure.

3. Press and hold both the REM and USED buttons,

simultaneously. The system will then countdown for 15

seconds, displaying the count on the left display window.

4. The word “FUL” appears in the lower display window, and

the current full fuel value appears in the upper display.

Release the REM and USED buttons. Keep holding the

FULL/ADD toggle switch in the FULL position.

5. Use the REM button to increment the full fuel number or the

USEDbutton to decrement the full fuel number. (The

longer you hold the button, the faster the number will be

updated.)

6. After reaching the correct total usable fuel figure, press the

TEST/ENTER 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

FULL/ADD toggle switch.

7. To verify that the data is stored properly, press the

TEST/ENTER 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 power off to the computer for

approximately one minute. This will ensure that the unit has

enough time to store the proper figures into the program.

2.2 PREFLIGHT CHECK

Diagnostic software is built into the system. To activate it, press

the TEST/ENTER button and hold until “8’s” begin to appear

across the displays windows and then release. If the test is

successful, the word “Good” will appear on the upper display

window for three seconds. If the test is not successful, the word

“bAd” and an error message identifying the error will be displayed.

In such case, the unit will cease to function and must be considered

unserviceable until corrective action is taken.

At the end of the test routine the system will display the following:

1. In the twin engine models the left lower window displays

the K-factor for the left engine, and the right lower window

displays the K-factor for the right engine. The next screen

displays the right engine K-factor again. This number must

match the pulse count stamped on the fuel flow transducer

otherwise all the readout will be inaccurate. The units (Gal,

LB5.8, LB6.7, etc) display in the upper window.

2. The distance to waypoint or destination is displayed on the

upper window as shown on the Loran-C or GPS receiver to

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