All INDICATING. DESCRIPTION A. Fuel Quantity Serials 005 thru 885: A fuel quantity gage is installed in the center console directly forward of the fuel selector valve. The fuel quantity gage indicates the amount of usable fuel remaining in each fuel tank. One float type fuel quantity sensor is installed in each integral fuel tank. The fuel level sending units are not adjustable. To adjust the fuel quantity gage reading, the gage itself must be adjusted. The fuel quantity gage is a 2¼ dual indicator, with separate needles and markings for the LH and RH fuel tanks, and a range of 0 gallons to full (F). The gage has a yellow arc from 0 to 8.2 gallons, a red line at 0 gallons, and a red arc from 0 gallons down to the minimum meter movement. The gage has 4 separate needle adjustment trim potentiometers for full and empty indications on the LH and RH tanks. Each indicator also provides an output signal to illuminate the FUEL caution light when the fuel quantity is low. These outputs are monitored by the caution/warning annunciator panel to indicate a low fuel condition. The gage is internally lighted with externally replaceable lamps, and has non-reflective glass. 28 VDC for fuel quantity system operation is supplied through the 3-amp FUEL QTY circuit breaker on Main Bus. Serials 886 thru 255: A fuel quantity gage is installed in the center console directly forward of the fuel selector valve. The fuel quantity gage indicates the amount of usable fuel remaining in each fuel tank. Two float type fuel quantity sensors are installed in each integral fuel tank, one on the inboard rib and one on the outboard rib. The fuel level sending units are not adjustable. To adjust the fuel quantity gage reading, the gage itself must be adjusted. The fuel quantity gage is a 2¼ dual indicator, with separate needles and markings for the LH and RH fuel tanks, and a range of 0 gallons to full (F). The gage has a yellow arc from 0 to 8.2 gallons and a red line at 0 gallons. The gage has 4 separate needle adjustment trim potentiometers for full and empty indications on the LH and RH tanks. The annunciator indicates low fuel with 8.5 to 7 gallons remaining during level flight. These outputs are monitored by the caution/warning annunciator panel to indicate a low fuel condition. The gage is internally lighted with externally replaceable lamps, and has non-reflective glass. 28 VDC for fuel quantity system operation is supplied through the 3-amp FUEL QTY circuit breaker on Main Bus. Serials 256 & subs: A dual reading fuel quantity indicator is displayed in the Fuel Qty block of the ENGINE page along calibrated vertical bars. The fuel quantity indicator indicates the amount of usable fuel remaining in each fuel tank. When the ENGINE page is not shown, all essential fuel information is shown on the engine strip displayed along the edge of the MFD. The LEFT pointer indicates left tank fuel quantity and sweeps a scale marked from 0 to 28 U.S. gallons. The RIGHT pointer sweeps an identical scale for the right tank. Each scale is marked with a red line at zero, a yellow band from 0 to 8.2 U.S. gallons, and a green band from 8.2 to 28 U.S. gallons. The indicators are calibrated to read 0 gallons when no usable fuel remains in level flight attitude. Two float type fuel quantity sensors are installed in each integral fuel tank, one on the inboard rib and one on the outboard rib. The fuel level sending units are not adjustable. Fluid quantity information is sent to the Engine Airframe Unit, processed, and transmitted to the Fuel Quantity Gage for display. 28 VDC for the fuel quantity system is supplied through the 3-amp FUEL QTY circuit breaker on MAIN BUS. Serials 256 thru 2292: The 28 VDC is converted to 2 VDC for the fuel quantity sensors through the Level Sensor Power Circuit Card. For information pertaining to the Level Sensor Power Circuit Card, see Chapter 24, Section 50 - Electrical Load Distribution. (Refer to 24-50) B. Fuel Flow Serials 005 thru 58: A 2¼ combination Fuel Flow and Manifold Pressure indicator is mounted on the right instrument panel immediately below the tachometer. The indicator is internally lighted. 28 VDC for instrument operation is supplied through the 5-amp ENGINE INST circuit breaker on Main Bus. The fuel flow pointer sweeps a scale marked from 0 to 30 Gal/Hr. The electrically operated fuel flow indicator receives a rate signal from a fuel flow transducer installed in the fuel line between the throttle body metering valve and the injector manifold. For maintenance practices pertaining to fuel flow indication, see Chapter 77-0, Engine Indicating, Power. (Refer to 77-0) Page 9 Sep 207
Serials 582 thru 205, 206 & subs w/o Perspective Avionics: Fuel flow is shown as text in the fuel data block located in the lower right corner of the MFD and is also continuously displayed in the engine data block located in the lower right corner of the PFD. The MFD and PFD receive a fuel flow rate signal via the DAU from a fuel flow sensor on the right side of the engine in the fuel line between the throttle body metering valve and the injector manifold. In the event fuel flow exceeds 26.7 Gal/Hr, the MFD will display Check Fuel Flow in a yellow advisory box in the lower right corner of the MFD. If fuel flow exceeds 30 Gal/Hr, the MFD will display Check Fuel Flow in a red advisory box in the lower right corner of the MFD. Serials 206 & subs w/ Perspective Avionics: Fuel flow is shown in the upper right corner of the MFD as both a simulated pressure gage and as text. The simulated gage receives a signal from a fuel flow sensor on the right side of the engine in the fuel line between the throttle body metering valve and the injector manifold via the GEA 7 engine airframe unit. The gage sweeps a scale marked from 0 to 35 Gal/Hr in 2.5 Gal/Hr increments. Fuel flow rate is also continuously displayed in the engine data block located on the left side of the PFD. In the event fuel flow exceeds 30 Gal/Hr, the PFD will display Check Fuel Flow in a red advisory box in the lower right corner of the PFD. For maintenance practices pertinent to the fuel flow gage and sensor refer to Chapter 73, Engine Fuel System. (Refer to 73-30) C. Fuel Totalizer and Calculated Information Fuel totalizer calculations are located in the lower right section of the ENGINE page and are separate and independent of the fuel quantity gage and float sensor system. Serials 582 thru 205, 206 & subs w/o Perspective Avionics: The fuel totalizer monitors fuel flow and calculates fuel used, fuel remaining, time remaining, and nautical miles per gallon. Serials 206 & subs w/ Perspective Avionics: The fuel totalizer monitors fuel flow and calculates fuelto-destination, fuel used, fuel remaining, time remaining, fuel range, and nautical miles per gallon. Upon system startup, the fuel totalizer initial fuel screen appears and prompts the user to enter the total fuel on board at start. The option to enter the number of gallons added since last fuel fill and the ability to set fuel to Full or to Tabs buttons is also available. For maintenance practices pertinent to MFD display refer to Chapter 3, Central Display Systems. (Refer to 3-60) D. Fuel System Annunciations Serials w/o Perspective Avionics: The amber FUEL caution light in the annunciator panel comes on to indicate a low fuel condition. The light is illuminated by switches in the fuel quantity indicator if the fuel quantity is low. The light could illuminate with 8.5 to 7 gallons remaining during level flight. If FUEL caution light comes on in flight, refer to Fuel Quantity gages to determine fuel quantity. The light is powered by 28 VDC through the 2- amp ANNUN / ENGINE INST circuit breaker on the Essential Bus. Serials w/ Perspective Avionics: Fuel system advisory, caution, and warning messages are displayed in color-coded text in Crew Alerting System (CAS) window located to right of the Altimeter and Vertical Speed Indicator. In combination with CAS alert, the affected fuel parameter displayed on the ENGINE page changes to corresponding color of CAS alert and the annunciation system issues an audio alert. A white Advisory message is generated when either fuel tank goes below 8 gallons. An amber Caution message is generated when both fuel tanks go below 8 gallons. A red Warning message is generated when the fuel totalizer amount goes below 7 gallons. Note that the Warning message is generated based on the fuel totalizer which is dependent on correct input by the pilot. For maintenance practices pertinent to system annunciations and alerts refer to Chapter 3, Indicating/Recording Systems. (Refer to 3-50) Page 2 9 Sep 207 All
2. MAINTENANCE PRACTICES When servicing fuel system pipe thread fittings, apply a small amount of grease (MIL-G- 60320 Type ) to the external threads. A. Fuel Quantity Gage (Analog) - Serials 005 thru 255 (See Figure ) () Removal - Fuel Quantity Gage (a) Set BAT, BAT 2, and AVIONICS switches to OFF positions. (b) Serials 005 thru 58: Pull ENGINE INST circuit breaker. (c) Serials 582 thru 255: Pull FUEL QTY / HOBBS circuit breaker. (d) Remove right mid console trim. (Refer to 25-0) (e) Disconnect wire harness from fuel quantity gage. (f) Remove screws and washers securing fuel quantity gage to center console. (2) Installation - Fuel Quantity Gage (a) Position fuel quantity gage to center console and secure with screws and washers. (b) Connect wire harness to fuel quantity gage. (c) Perform Adjustment/Test - Fuel Quantity Gage. (Refer to ) (d) Install right mid console trim. (Refer to 25-0) (e) Serials 005 thru 58: Reset ENGINE INST circuit breaker. (f) Serials 582 thru 255: Reset FUEL QTY / HOBBS circuit breaker. (3) Adjustment/Test - Fuel Quantity Gage (a) Remove right mid console trim. (Refer to 25-0) (b) Drain LH and RH fuel tanks and collector tanks. (Refer to 2-0) (c) Level airplane laterally and longitudinally. (Refer to 08-0), (Refer to 08-0) (d) Serials 886 thru 255: At inboard and outboard sending unit dials, ensure red needle points at E or below. (e) Serials 005 thru 885: Add 2.25 gallons of fuel to each tank and allow fuel to settle. (f) Serials 886 thru 255: Add.25 gallons of fuel to each tank and allow fuel to settle. (g) Set BAT switch to ON position. If installing new fuel level gage, do not adjust gain screws prior to calibration. (h) Remove tape covering fuel quantity gage trim potentiometers. CAUTION: DO NOT press down hard or force potentiometers outside 280 range during adjustments. Doing so will damage potentiometers resulting in physical damage to fuel quantity gage. Adjust FULL trim potentiometers to center of travel prior to making EMPTY adjustment. Failure to do so may result in FULL trim potentiometers running out of travel before FULL adjustment can be obtained. (i) (j) Adjust FULL trim potentiometers to center of travel. Slowly adjust LH EMPTY trim potentiometer until needle indicates zero gallons. Repeat for RH EMPTY trim potentiometer. Fuel level gage responds slowly. Lightly tap on metallic rim of fuel level gage and allow approximately one minute between each adjustment. (k) Serials 005 thru 255 Set BAT switch to OFF position. Page 3 0 Feb 203
(l) (m) (n) Fill both fuel tanks to within one inch of filler cap. Set BAT switch to ON position. Slowly adjust LH FULL trim potentiometer until needle indicates full. Repeat for RH FULL trim potentiometer. Fuel level gage responds slowly. Lightly tap on metallic rim of fuel level gage and allow approximately one minute between each adjustment. (o) Set BAT switch to OFF position. (p) Cover fuel quantity gage trim potentiometers with tape. (q) Install right mid console trim. (Refer to 25-0) (4) System Test - Fuel Sending Unit (a) Verify ignition switch is in OFF position and remove key. (b) Set BAT switch to OFF position. (c) Fill each fuel tank with 28 gallons of fuel. (Refer to 2-0) (d) Remove right mid console trim. (Refer to 25-0) (e) Disconnect wire harness from fuel quantity gage. (f) Set multimeter to 00-ohm scale and zero the ohmmeter. CAUTION: If battery power is on for the following test, the ohmmeter could become permanently damaged. (g) Measure resistance of LH fuel tank. Connect black (-) ohmmeter lead to pin # 9 (blue, ground) fuel sending unit wire. 2 Connect red (+) ohmmeter lead to pin # 2 (white, power) fuel sending unit wire. If these specifications are not met, inspect the fuel sending unit or the wires and connectors to the sending unit. (h) 3 Serials 005 thru 885: Verify meter indicates 86.9 to 92.9 ohms when LH tank is full. If LH tank were empty (dry), the meter should indicate 6. to 20. ohms. 4 Serials 886 thru 255: Verify meter indicates 58 to 62 ohms when LH tank is full. If LH tank were empty (dry), the meter should indicate 0.0 to 5.0 ohms. Measure resistance of RH fuel tank. Connect black (-) ohmmeter lead to pin # 9 (blue, ground) fuel sending unit wire. 2 Connect red (+) ohmmeter lead to pin # 4 (orange, power) fuel sending unit wire. If these specifications are not met, inspect the fuel sending unit or the wires and connectors to the sending unit. (i) (j) (k) (l) 3 Serials 005 thru 885: Verify meter indicates 86.9 to 92.9 ohms when RH tank is full. If RH tank were empty (dry), the meter should indicate 6. to 20. ohms. 4 Serials 886 thru 255: Verify meter indicates 58 to 62 ohms when RH tank is full. If RH tank were empty (dry), the meter should indicate 0.0 to 5.0 ohms. Connect fuel quantity gage wire harness to fuel sending unit wire harness. Set multimeter to DC 30-volt scale. Set key switch (main power supply) to ON position. Connect red (+) voltmeter lead to fuel gage pin # (power), connect black (-) voltmeter lead to fuel gage pin # 9 (ground). Battery voltage should be present. Page 4 0 Feb 203 Serials 005 thru 255
If battery voltage is not present, inspect circuit breakers, wiring harness, voltmeter, and battery. If fuel sending unit resistance meets specifications and battery voltage is present at the gage, then either the gage or the wires and connector to the gage are faulty. (m) Install right mid console trim. (Refer to 25-0) Serials 005 thru 255 Page 5
E M P T Y LEFT ADJ F U L L 2 3 4 NOTE DO NOT press down hard or force potentiometers outside 280 range during adjustments. Doing so will damage potentiometers resulting in physical damage to fuel quantity gage. Serials 005 thru 255. LEGEND. Fuel Quantity Gage 2. Screw 3. Washer 4. Connector SR20_MM28_32D Page 6 Figure Fuel Quantity Gage - Serials 005 thru 255 Serials 005 thru 255
B. Fuel Quantity Gage (Analog-Electric) - Serials 256 & subs (See Figure ) Fuel quantity is measured by a float type quantity sensors installed in the fuel tanks. Fluid quantity information is sent to the Engine Airframe Unit, processed, and transmitted to the analog electronic Fuel Quantity Gage and CAS window for display. () Adjustment/Test - Fuel Quantity Indication (a) Drain LH and RH fuel tanks and collector tanks. (Refer to 2-0) (b) Level airplane laterally and longitudinally. (Refer to 08-0), (Refer to 08-0) To achieve the required fuel quantity precision, it is recommended that the fuel quantities be weighed with a calibrated scale. Fuel density of 6 lbs/gallon is acceptable for purposes of this procedure. (c) (d) (e) (f) (g) (h) (i) (j) (k) (l) (m) (n) Set the fuel selector to OFF. Connect 28VDC external power supply to the aircraft. Add.25 +0.25 / -0.0 gallons of unusable fuel to each tank and allow fuel to settle. Pull MFD and PFD circuit breakers. On MFD and PFD, remove and retain any SD cards from top and bottom SD card slots. Set BAT, BAT2, and AVIONICS switches to ON positions. While holding ENT key on PFD, restore power by closing PFD circuit breaker. When words Initializing System appear in upper left corner of PFD, release ENT key. Restore power to MFD. (PFD should now be in Configuration mode, and MFD should be in Normal mode). On MFD, press ENGINE softkey to display full page engine instrumentation. Using PFD, go to FUEL TANK CALIBRATION page. Press softkeys 2,, 0, and 9 in order to unlock this page: Press TNK SEL softkey to activate cursor in CURRENT TANK field. Rotate FMS knob as necessary to select RIGHT or LEFT tanks. (o) (p) Empty Calibration: Verify that unusable fuel (.25 +0.25 / -0.0 gallons) has been added to both tanks. Allow both fuel probes to stabilize for at least 2 minutes. 2 Select LEFT tank on PFD. 3 Press EMPTY softkey. The ACTUAL FUEL QUANTITY field value will default to 00.00, and cursor will automatically activate and select CALIBRATE? option. 4 Press ENT key. If prompt appears requesting overwrite acknowledgement, select YES and press ENT key. The Perspective system will zero ACTUAL FUEL QUAN- TITY field value to be displayed at the current CALIBRATED VALUE. 5 Observe CALIBRATED TOTAL indication for LEFT tank. Verify that it remains at 0.00. 6 On MFD, verify fuel quantity indicators correctly point to 0. 7 Repeat empty calibration for RIGHT tank. Tank Calibration: Fill LEFT tank with a specified volume of usable fuel at 5.0 ±0.5 gallons. Dispensed usuable fuel shall be measured to within 0.5% accuracy (Actual vs. Indicated). Serials 256 & subs Page 7 0 Feb 203
Typically, fuel dispensing equipment that is certified for retail sale of fuel by the state Division of Weights and Measures exceeds 0.5% accuracy. (q) (r) 2 Allow fuel probe to stabilize at least 2 minutes. 3 Enter dispensed fuel volume into ACTUAL FUEL QUANTITY field and press ENT key. The cursor automatically selects CALIBRATE? Option. 4 Press ENT key again to calibrate, setting the ACTUAL FUEL QUANTITY to be displayed at the current CALIBRATED VALUE. 5 Verify a corresponding point appears in CALIBRATION TABLE. 6 Verify that CALIBRATED TOTAL value equals amount of usable fuel added to tank. 7 On MFD, verify fuel quantity indicators correctly point to usable fuel added to tank. 8 Repeat tank calibration for RIGHT tank. 9 Repeat tank calibration with specified volumes of usable fuel at 5, 20, and 28 (±0.5) gallons. Re-install any retained SD cards to top and bottom SD card slots on MFD and PFD. Reset MFD and PFD circuit breakers. Page 8 0 Feb 203 Serials 256 & subs
FUEL FLOW ENG SCALE ENG 2 SCALE FUEL TEMP L OFFSET.00000.00000 0.000 RAW VAL. F CAL VAL 32.000 F FUEL TEMP R OFFSET 0.000 RAW VAL. F CAL VAL 32.000 F SELECTED TANK FUEL TANK CALIBRATION FUEL CALIBRATION POINTS CURRENT TANK LEFT FUEL UNITS GALLONS(GL,GL/HR) SENSOR LIMITS SENSOR INPUTS LEFT LEFT FLOOR -74.2900 53.78842 LEFT 2. LEFT CEILING 348.25800 LEFT 3. LEFT 2 FLOOR 0.00000 LEFT 4. LEFT 2 CEILING 0.00000 LEFT 5. LEFT 3 FLOOR 0.00000 LEFT 3 CEILING 0.00000 ACTUAL LEFT 4 FLOOR 0.00000 FUEL QUANTITY CALIBRATION VALUE 0.00GL 53.78842 LEFT 4 CEILING 0.00000 CALIBRATE? LEFT 5 FLOOR 0.00000 CALIBRATION TABLE LEFT 5 CEILING 0.00000 ACTUAL QUANTITY CALIBRATED VALUE ACTUAL FUEL QUANTITY FIELD CALIBRATION VALUE FIELD CALIBRATION TABLE LEFT SUB-TANKS RAW VAL SLOPE OFFSET CAL VAL 4.20940GL 0.00000e+00 0.00000e+00GL 0.00GL 2. GL 0.00000e+00 0.00000e+00GL. GL 3. GL 0.00000e+00 0.00000e+00GL. GL 4. GL 0.00000e+00 0.00000e+00GL. GL 5. GL 0.00000e+00 0.00000e+00GL. GL CALIBRATED TOTAL 0.00GL FUL FLW TNK SEL LIMITS EMPTY FULL RAW DATA SCALE FUEL QTY 9 0 2 PFD IN CONFIGURATION MODE (FUEL TANK CALIBRATION PAGE) NOTE Press softkeys 2,, 0, and 9 in order to unlock this page. The PFD softkeys may be used to place the cursor in the desired field, similar to scrolling using the outer FMS knob. TANK SEL: Places cursor in CURRENT TANK field. EMPTY: The ACTUAL FUEL QUANTITY defaults to 0.00 GL and places cursor in CALIBRATE? field. FULL: The ACTUAL FUEL QUANTITY defaults to 28.00 GL and places cursor in CALIBRATE? field. FUEL QTY: Places cursor in ACTUAL FUEL QUANTITY field. CAL TBL: Places cursor in CALIBRATION TABLE field at the first calibration point. Serials 256 & subs Serials 256 & subs. Figure 2 Fuel Quantity Indication - Serials 256 & subs (Sheet of 3) SR20_MM28_3526 Page 9
TFR N/A MAP - NAVIGATION MAP KCQM 2D HDG UP KFOZ KELO LAK KHIB KEVM KGPZ KBFW LAKE SUPERIOR 07Y KCOQ MN33 DULUTH KSUW 4R5 LAKE SUPE KHZX Y77 KAIT KMZH KOLG 5G4 DCLTR SHW CHRT CHKLIST PFD w/ EIS DISPLAY (ENGINE PAGE) MFD w/ EIS DISPLAY (ENGINE PAGE) LEGEND. Fuel Quantity Indicator Serials 256 & subs. SR20_MM28_354 Page 0 Figure 2 Fuel Quantity Indication - Serials 256 & subs (Sheet 2 of 3) Serials 256 & subs
MFD / PFD w/ EIS DISPLAY (REVERSIONARY MODE) LEGEND. Fuel Quantity Indicator Serials 256 & subs Serials 256 & subs. Figure 2 Fuel Quantity Indication - Serials 256 & subs (Sheet 3 of 3) SR20_MM28_3522 Page
C. Fuel Quantity Sensor - Serials 005 thru 885 (See Figure 3) () Removal - Fuel Tank Quantity Sensor (a) Set BAT, BAT 2, and AVIONICS switches to OFF positions. (b) Serials 005 thru 58: Pull ENGINE INST circuit breaker. (c) Serials 582 thru 885: Pull FUEL QTY / HOBBS circuit breaker. (d) De-fuel airplane. (Refer to 2-0) (e) Remove access panels LW3 and LW4 or RW3 and RW4. (Refer to 06-00) (f) Remove nut and washer securing wire to center terminal of sensor. One of the sensor mounting screws also secures a wire to the sensor base. To aid reinstallation, note which screw attaches the wire prior to removing sensor. (g) Remove screws and washers securing sensor to wing rib. Remove sensor from airplane. (2) Installation - Fuel Tank Quantity Sensor (a) Thread gasket onto sensor and position next to sensor base. (b) Insert sensor through mounting hole in wing rib and position sensor base to rib. (c) Loosely secure wire to sensor base with screw and washer. (d) Install remaining screws and washers securing sensor and gasket to wing rib. Torque screws to 30 in-lb (3.4 Nm) plus nut drag. (e) Install washer and nut securing wire to center terminal of sensor. Torque nut to 2 in-lb (.35 Nm). (f) Install access panels LW3 and LW4 or RW3 and RW4. (Refer to 06-00) (g) Perform Adjustment/Test - Fuel Quantity Gage. (Refer to ) (h) Serials 005 thru 58: Reset ENGINE INST circuit breaker. (i) Serials 582 thru 885: Reset FUEL QTY / HOBBS circuit breaker. Page 2 Serials 005 thru 885
WIRE (REF) 2 5 4 2 3 6 WING FUEL TANK RIB (REF) LEGEND. Nut 2. Washer 3. Screw 4. Mounting Ring 5. Gasket 6. Sending Unit SR20_MM28_3C Serials 005 thru 885 Figure 3 Fuel Quantity Sensor - Serials 005 thru 885 Page 3
D. Fuel Quantity Sensors - Serials 886 thru 255 (See Figure 4) CAUTION: Do not allow isopropyl alcohol or acetone to contact sensor dial or cracking and crazing will occur. () Removal - Fuel Quantity Sensors (a) Set BAT, BAT 2, and AVIONICS switches to OFF positions. (b) Pull FUEL QTY / HOBBS circuit breaker. (c) Remove wing access panel LW5, RW5, LW0, or RW0. (Refer to 06-00) (d) Disconnect sensor connector from wire harness. (e) Remove screws securing sensor dial to sending unit. Remove sensor dial from airplane. (f) If necessary, remove sending unit. De-fuel airplane. (Refer to 2-0) 2 Remove bolts and washers securing sending unit to wing rib. Remove sending unit and gasket from airplane. (2) Installation - Fuel Quantity Sensors (a) If necessary, install sending unit. Install gasket onto sending unit. 2 Position sending unit and gasket to wing rib and secure with bolts and washers. Torque screws to 30 in-lb (3.4 Nm) plus nut drag. (b) Verify sensor dial needle indicates a fuel level of E (empty) or below. CAUTION: When installed, the sensor dial needle must indicate a fuel level of E (empty) or below to calibrate correctly. (c) If sensor dial needle does not indicate a fuel level of E (empty) or below, adjust sensor dial needle. From back of sensor dial, position metallic (steel) object against magnetic portion of sensor dial to manually adjust needle position. 2 Rotate needle to indicate a fuel level of E (empty) or below. (d) Position sensor dial to sending unit and secure with screws. Torque screws to 4-9 in-lb (0.5 -.0 Nm) (e) Connect sensor connector to wire harness. (f) Install wing access panel LW5, RW5, LW0, or RW0. (Refer to 06-00) (g) Perform Adjustment/Test - Fuel Quantity Gage. (Refer to ) (h) Reset FUEL QTY / HOBBS circuit breaker. (3) Adjustment/Test - Fuel Quantity Sensors (a) De-fuel airplane. (Refer to 2-0) (b) Set BAT, BAT 2, and AVIONICS switches to OFF positions. (c) Pull FUEL QTY / HOBBS circuit breaker. (d) Remove access panel LW5, RW5, LW0, or RW0. (Refer to 06-00) (e) Place multimeter in the 50-ohm scale and zero out the ohmmeter. CAUTION: If ohmmeter leads come in contact with battery power, the ohmmeter could become permanently damaged. Page 4 (f) Connect black (-) ohmmeter lead to one of the sensor connector pins. (g) Connect red (+) positive ohmmeter lead to other connector pin. (h) Verify meter indicates 0.6 to 3.0 ohms when sensor is in the empty (down) position and 33 to 35 ohms when sensor is in the full (up) position. Serials 886 thru 255
(i) If sensor fails to indicate correct resistance values, replace sensor. (j) Install access panel LW5, RW5, LW0, or RW0. (Refer to 06-00) (k) Reset FUEL QTY / HOBBS circuit breaker. (4) Functional Test - Fuel Quantity Sensor Dial (a) Remove fuel quantity sensor dial. (Refer to ) (b) Verify sensor dial needle indicates a fuel level of E (empty) or below. (c) If sensor dial needle does not indicate a fuel level of E (empty) or below, adjust sensor dial needle. From back of sensor dial, position metallic (steel) object against magnetic portion of sensor dial to manually adjust needle position. 2 Rotate needle to indicate a fuel level of E (empty) or below. (d) Connect sensor dial to ohmmeter to observe resistance. (e) Verify resistance value indicates between 0.0 to 3.5 ohms. (f) From back of sensor dial, position metallic (steel) object against magnetic portion of sensor dial to manually adjust needle position. (g) Rotate metallic device slowly and watch resistance on ohmmeter. (h) Verify resistance increases and observe values. If measured value increases but varies by less than or equal to 2ohms, sensor dial is functional. 2 If measured value increases but varies greater than 2ohms, sensor dial is defective. 3 If measured value is greater than 33 ohms at anytime, sensor dial is defective. (i) Install fuel quantity sensor dial. (Refer to ) Serials 886 thru 255 Page 5
4 3 2 WING FUEL TANK RIB (REF) Serials 886 thru 255. 4 2 3 WING FUEL TANK RIB (REF) LEGEND. Screw 2. Dial 3. Sending Unit 4. Gasket Serials 886 thru 255. SR20_MM28_2572A Page 6 Figure 4 Fuel Quantity Sensor - Serials 886 thru 255 Serials 886 thru 255
E. Fuel Quantity Sensors - Serials 256 & subs (See Figure 5) () Removal - Fuel Quantity Sensors (a) Set BAT, BAT 2, and AVIONICS switches to OFF positions. (b) Pull FUEL QTY circuit breaker. (c) De-fuel airplane. (Refer to 2-0) (d) Remove wing access panel LW5, RW5, LW0, or RW0. (Refer to 06-00) (e) Disconnect sensor connector from wire harness. (f) Remove screws and washers securing sending unit to wing rib. Remove sending unit and gasket from airplane. (2) Installation - Fuel Quantity Sensors (a) Install gasket onto sending unit. (b) Position sending unit and gasket to wing rib and secure with screws and washers. Torque screws to 20 in-lb (2.26 Nm) plus nut drag. (c) Connect sensor connector to wire harness. (d) Install wing access panel LW5, RW5, LW0, or RW0. (Refer to 06-00) (e) Perform Adjustment/Test - Fuel Quantity Indication. (Refer to ) (f) Reset FUEL QTY circuit breaker. Serials 256 & subs Page 7 0 Jan 206
4 3 2 Serials 256 thru 2292. 4 3 2 4 3 2 Serials 256 thru 2292. WING FUEL TANK RIB (REF) Serials 2293 & subs. 3 2 4 WING FUEL TANK RIB (REF) LEGEND. Screw 2. Washer 3. Sending Unit 4. Gasket Serials 2293 & subs. SR20_MM28_357B Page 8 0 Jan 206 Figure 5 Fuel Quantity Sensors - Serials 256 & subs Serials 256 & subs
F. Fuel Pressure Switch For maintenance practices pertinent to the fuel pressure switch, see Chapter 73-20, Engine Fuel System, Controlling. (Refer to 73-20) G. Fuel Flow Sensor For maintenance practices pertinent to the fuel flow sensor, see Chapter 73-30, Engine Fuel System, Indicating. (Refer to 73-30) H. Fuel Flow Gage - Serials 005 thru 58 For maintenance practices pertinent to the fuel flow gage on these airplanes, see Chapter 77-0, Engine Indicating, Power. (Refer to 77-0) All Page 9
I. Fuel Flow Indication - Serials 582 thru 205, 206 & subs w/o Perspective Avionics (See Figure 6) Fuel flow is displayed electronically on the MFD and PFD screens. () Operational Test - Fuel Flow Indication (a) Set BAT and AVIONICS switches to ON positions. (b) On MFD, when PRESS ANY BEZEL KEY TO CONTINUE is displayed, press any key. (c) If Engine Monitoring is selected, press [Fuel Done] to enter Map page. (d) Rotate left knob to select Engine page. (e) Verify fuel flow gage display indicates zero. (f) Set BAT and AVIONICS switches to OFF positions. Page 20 Serials 582 thru 205, 206 & subs w/o Perspective Avionics
J. Fuel Flow Indication - Serials 206 & subs w/ Perspective Avionics (See Figure 6) Fuel flow is displayed electronically on the MFD and PFD screens. () Operational Test - Fuel Flow Indication (a) Set BAT and AVIONICS switches to ON positions. (b) On MFD, follow on-screen instructions to enter normal MFD operation. (c) Press [Engine] to select Engine page. (d) Verify fuel flow gage display indicates zero. (e) Set BAT and AVIONICS switches to OFF positions. Serials 206 & subs w/ Perspective Avionics Page 2
PFD w/ ENGINE DISPLAY MFD w/ ENGINE DISPLAY Serials 582 thru 205, 206 & subs w/o Perspective Avionics. LEGEND. Fuel Flow Indicator Figure 6 Fuel Flow Indication - Serials 582 thru 205, 206 & subs w/o Perspective Avionics (Sheet of 3) Page 22 SR20_MM28_359A Serials 582 thru 205, 206 & subs w/o Perspective Avionics
PFD w/ EIS DISPLAY (ENGINE PAGE) MFD w/ EIS DISPLAY (ENGINE PAGE) LEGEND. Fuel Flow Indicator Serials 206 & subs w/ Perspective Avionics. SR20_MM28_36A Figure 6 Fuel Flow Indication - Serials 206 & subs w/ Perspective Avionics (Sheet 2 of 3) Serials 206 & subs w/ Perspective Avionics Page 23
MFD / PFD w/ EIS DISPLAY (REVERSIONARY MODE) LEGEND. Fuel Flow Indicator Serials w/ Perspective Avionics. SR20_MM28_3524 Page 24 Figure 6 Fuel Flow Indication - Serials 206 & subs w/ Perspective Avionics (Sheet 3 of 3) Serials 206 & subs w/ Perspective Avionics