Distribution

CIRRUS AIRPLANE MAINTENANCE MANUAL MODEL SR22

DISTRIBUTION

1. DESCRIPTION This section contains information on the distribution system. The fuel distribution system consists of electric and mechanical (engine-driven) fuel pumps, fuel gascolator, fuel hose, fuel lines, fuel selector valve, and fuel pump switches. A gascolator is installed on the forward side of the firewall after the electric fuel pump and before the engine driven fuel pump. A drain valve, connected to the bowl of the gascolator, is used to drain off contaminates during the preflight inspection. The gascolator provides 100 to 140 micron filtration and has a 4.9 fluid ounce (144.89 milliliters) capacity. The filter element can be cleaned or replaced when the bowl is removed.

Note: The majority of all fuel system problems are directly related to contaminated fuel. Therefore inspecting and cleaning the fuel drains and filter in the gascolator should be considered to be of utmost importance. Under normal operating conditions the fuel drains and filter in the gascolator should be inspected and cleaned as called out in Chapter 5. If the airplane is used in dusty or dirty environments, the fuel drains and filter in the gascolator should be cleaned more often.

The engine-driven fuel pump is mounted to the aft side of the engine. An electric fuel pump is installed on the forward side of the firewall. Mounted on the center console (adjacent to the fuel selector valve) is a Fuel Pump BOOST-PRIME rocker switch. The prime position on the switch is momentary. The boost position is continuous. The boost pump operates on 28 VDC supplied through the 5-amp FUEL PUMP circuit breaker on Main Bus 2. Serials 0002 thru 0277 before SB 22-73-01: A fuel pressure based system is used to control boost pump operation. Both positions of the pump normally operate on the low-speed setting. For engine priming, a pressure actuated switch located on the fuel injection distribution manifold allows the pump to run on high speed when fuel system pressure is below 3 PSI. This allows rapid priming of the fuel system for starting. Once the fuel system is primed, the electric pump is switched to the low-speed setting by the pressure switch. The boost position operates the electric pump at the low-speed setting only, regardless of fuel system pressure. Serials 0278 and subs, 0002 thru 0277 after SB 22-73-01: An oil pressure based system is used to control boost pump operation. The oil pressure/oil temperature gauge provides a signal to the starting circuit/DAU to generate a ground for the oil annunciator and the fuel system. This system allows the fuel pump to run at the prime (high speed) when the engine oil pressure is less than 10 PSI. Whenever the engine oil pressure exceeds 10 PSI, pressing the prime switch will have no effect. The boost position energizes the boost pump in low-speed mode regardless of oil pressure to deliver a continuous 4-6 psi boost to the fuel flow for vapor suppression in a hot fuel condition. A fuel tank selector valve is installed in the center console between the crew seats, and is isolated from the cabin in case of leakage. The valve has a left, right, and off position. Each position has a positive detent. A knob is located at the top of the handle, and must be pulled to switch the valve to the off position; the valve can be rotated back to on without any further action. The selector valve can be switched between left and right fuel tanks by simply rotating the valve. The valve handle points in the direction of the tank being selected. The selector valve only allows feed from one tank at a time. Drain hoses are provided for the auxiliary fuel pump, gascolator, engine driven fuel pump, fuel injection manifold (spider), and the engine manifolds (cylinder heads). Drain hoses are routed to a drain manifold located on the bottom center of the firewall. A check valve is installed on the cylinder drain manifold to prevent loss of manifold pressure. The valve closes when manifold pressure is below ambient pressure. An aft side firewall fuel enclosure, and a selector valve enclosure prevent fuel from leaking into the cabin.

Note: When servicing fuel system pipe thread fittings, apply a small amount of grease (MIL-G- 60320 Type 1) to the external threads. EFFECTIVITY: All 28-20 Page 1 15 Apr 2007 CIRRUS AIRPLANE MAINTENANCE MANUAL MODEL SR22

2. MAINTENANCE PRACTICES A. Gascolator (See Figure 28-201) (1) Servicing - Gascolator (a) Remove gascolator. (Refer to 28-20) (b) Disassemble gascolator. (Refer to 28-20) (c) Soak fuel filter screen in approved fuel to loosen contaminates. (d) Using compressed air, blow from the inside of fuel filter screen to the outside to remove contaminates. (e) Assemble gascolator. (Refer to 28-20) (f) Install gascolator. (Refer to 28-20) (2) Removal - Gascolator (a) Disconnect battery 1. (Refer to 24-30) (b) Set fuel selector valve to OFF position. (c) Using fuel sampler, drain fuel from gascolator and drain tube. (d) Disconnect inlet and outlet lines from gascolator. (e) Disconnect drain tube from gascolator. (f) Remove screws and washers securing gascolator to mounting bracket. Remove gascolator from airplane. (3) Disassembly - Gascolator

Note: To aid disassembly, lightly tap on side of gascolator or rotate bowl while pulling apart to loosen o-ring seal.

(a) Remove drain valve fitting and stat-o-seal washer securing gascolator bowl to base. (b) Remove retaining ring securing filter screen to gascolator base. (4) Assembly - Gascolator (a) Position filter screen to gascolator base and secure with retaining ring. (b) Install new o-ring to gascolator base. (c) Position gascolator bowl to base and secure with drain valve fitting and new stat-o-seal washer. (5) Installation - Gascolator (a) Position gascolator to mounting bracket and loosely secure with screws and washers. (b) Connect inlet and outlet lines to gascolator. (c) Connect drain tube to gascolator. (d) Tighten screws and washers securing gascolator to mounting bracket. (e) Set fuel selector valve to ON position. (f) Inspect gascolator and fuel lines for signs of leakage. (g) Connect battery 1. (Refer to 24-30)

EFFECTIVITY: 28-20 All Page 2 15 Apr 2007 CIRRUS AIRPLANE MAINTENANCE MANUAL MODEL SR22

6 7

9 DRAIN MANIFOLD 10 (REF)

LEGEND 1. Base 2. O-Ring 3. Fuel Filter Screen 4. Retaining Ring 5 . Bowl 6. Stat-O-Seal Washer 7. Drain Fitting 8. Drain Tube 11 9. Nut 10. Washer 11. Drain Valve

SR22_MM28_1352C

Figure 28-201 Gascolator Assembly EFFECTIVITY: All 28-20 Page 3 15 Apr 2007 CIRRUS AIRPLANE MAINTENANCE MANUAL MODEL SR22

B. Electric Fuel Pump (See Figure 28-202) (1) Removal - Electric Fuel Pump (a) Disconnect battery 1. (Refer to 24-30) (b) Set fuel selector valve to OFF position. (c) Disconnect inlet tube from fuel pump. (d) Disconnect outlet tube from fuel pump. Drain fuel from tube. (e) Disconnect drain hose from fuel pump. (f) Disconnect fuel pump wires. (g) Loosen screws on clamps securing fuel pump to firewall. Remove fuel pump from airplane. (2) Installation - Electric Fuel Pump

CAUTION: If fittings were removed from fuel pump, install fittings using new o-rings.

(a) Position fuel pump to firewall and loosely secure with clamps. (b) Connect inlet tube to fuel pump. (c) Connect outlet tube to fuel pump. (d) Connect drain hose to fuel pump. (e) Connect fuel pump wires. (f) Tighten clamps securing fuel pump to firewall. Torque screws to 6.0 - 8.0 in-lb (0.68 - 0.90 Nm). (g) Connect battery 1. (Refer to 24-30) (3) Adjustment/Test - Electric Fuel Pump (a) Acquire necessary tools, equipment, and supplies.

Description P/N or Spec. Supplier Purpose

28v Power Supply - Any Source Supply power to airplane.

Fuel Pressure - Any Source Measure fuel pres- Meter sure at inlet of engine driven fuel pump.

Sealant RTV 162 General Electric Seal around cap nut.

(b) Disconnect battery 1. (Refer to 24-30)

Note: Place container under airplane to catch fuel when fuel line is disconnected.

(c) Disconnect fuel line at inlet of engine driven fuel pump. (d) Connect fuel pressure meter between fuel line and inlet of engine driven fuel pump. (e) Connect airplane to 28 volt power supply. (f) Ensure throttle and mixture controls are both full forward. (g) Place fuel pump switch in the BOOST position. (h) At inlet of engine driven fuel pump, verify fuel pressure meter reads between 4 and 6 psi. If fuel pressure is not between 4 and 6 psi, check part number of electric fuel pump to deter- mine if pump is adjustable. Part numbers ending in R may be adjusted.

EFFECTIVITY: 28-20 All Page 4 15 Apr 2007 CIRRUS AIRPLANE MAINTENANCE MANUAL MODEL SR22

(i) Serials 0002 & subs w/o adjustable fuel pump: Replace electric fuel pump. (Refer to 28- 20) (j) Serials 0002 & subs w/ adjustable fuel pump: Adjust electric fuel pump. 1 Locate cap nut on top of fuel pump. 2 Remove sealant from around cap nut. 3 Remove cap nut to expose fuel pump adjustment screw.

WARNING: Never adjust the low boost pressure higher than 6 psi. A low boost pressure higher than 6 psi may flood the engine and cause engine shutdown during flight.

4 To increase low boost pressure, turn adjustment screw clockwise until it stops. If adjustment screw can not be moved clockwise then no upward adjustment is avail- able and fuel pump must be replaced. To decrease low boost pressure, turn adjustment screw counter clockwise. 5 At inlet of engine driven fuel pump, verify fuel pressure meter reads between 4 and 6 psi. 6 Install cap nut and tighten one quarter turn by hand. 7 Apply sealant over cap nut and around hole in fuel pump cover. (k) Disconnect fuel pressure meter between fuel line and inlet of engine driven fuel pump. (l) Connect fuel line at inlet of engine driven fuel pump. (m) Connect battery 1. (Refer to 24-30)

EFFECTIVITY: All 28-20 Page 5 15 Apr 2007 CIRRUS AIRPLANE MAINTENANCE MANUAL MODEL SR22

C. Fuel Pump Switch (See Figure 28-203) (1) Removal - Fuel Pump Switch (a) Set BAT 1, BAT 2, and AVIONICS switches to OFF positions. (b) Pull FUEL PUMP circuit breaker. (c) Remove LH mid console trim panel. (Refer to 25-10) (d) Identify and disconnect wires from fuel pump switch. (e) Compress retainers securing switch to center console and push up to remove switch from airplane. (2) Installation - Fuel Pump Switch (a) Position switch to center console, compress retainers, and push down to secure. (b) Identify and connect wires to fuel pump switch. (c) Install LH mid console trim panel. (Refer to 25-10) (d) Reset FUEL PUMP circuit breaker.

EFFECTIVITY: 28-20 All Page 6 15 Apr 2007 CIRRUS AIRPLANE MAINTENANCE MANUAL MODEL SR22

1 2 3 4

5 7

OUT

LEGEND 1. Nut Plate 2. Fire Wall 3. Bracket 4. Spacer DRAIN MANIFOLD 5. Clamp (REF) 6. Fuel Pump 7. O-ring 8. Nipple 9. Clamp 10. Drain Hose

SR22_MM28_1351A

Figure 28-202 Electric Fuel Pump Installation EFFECTIVITY: All 28-20 Page 7 15 Apr 2007 CIRRUS AIRPLANE MAINTENANCE MANUAL MODEL SR22

D. Selector Valve - Serials 0002 thru 0599 (See Figure 28-203) (1) Removal - Selector Valve

WARNING: Disconnect the battery prior to servicing the selector valve.

(a) Disconnect battery 1. (Refer to 24-30) (b) Remove crew seats. (Refer to 25-10) (c) Remove LH and RH mid console trim panels. (Refer to 25-10) (d) Remove screw securing fuel selector knob to shaft of fuel selector valve. (e) Remove screws, washers, and nuts securing selector valve to engine control panel. (f) Remove screws securing engine control panel to center console.

CAUTION: Use care not to strain or bend attaching wires and components when lifting engine control panel.

(g) Carefully lift engine control panel just enough to allow removal of selector valve shaft. (h) Remove screws and washers securing front panel of selector valve enclosure. (i) Remove screws and washers securing side panels and gaskets to selector valve enclosure. (j) Disconnect fuel supply and return lines from selector valve. (k) Remove screws and washers securing selector valve to top enclosure panel. (l) Remove screws, washers, and nuts securing selector valve to bottom enclosure panel. (m) Remove fuel selector valve from airplane. (2) Installation - Selector Valve (a) Acquire necessary tools, equipment, and supplies.

Description P/N or Spec. Supplier Purpose

Extrusion Gun MIL-S-8802 Type 2 Class B Faying sur- Sealant CS3204 C1.B Chem Seal - Flame Master face seal fuel GC408B Goal system enclo- P/S 890B PRC Aerospace Sealants sure in cabin. PR1440B PRC Aerospace Sealants EC1675B 3M AC-240B Dynamold Aerospace

(b) Position selector valve assembly to bottom enclosure panel and secure with screws, washers, and nuts. (c) Install screws and washers securing selector valve to top enclosure panel. (d) Connect fuel supply and return lines to selector valve.

WARNING: Fuel line grommets seal fuel and vapors inside the selector valve enclosure. Ensure grommets are properly installed to prevent fuel from entering cabin.

(e) Verify fuel line grommets are flat against interior and exterior surfaces of the selector valve enclosure. (f) Fay surface seal front enclosure panel to top and bottom enclosure panels. Secure front enclosure panel with screws and washers. (Refer to 20-10)

EFFECTIVITY: 28-20 Serials 0002 thru 0599 Page 8 15 Apr 2007 CIRRUS AIRPLANE MAINTENANCE MANUAL MODEL SR22

WARNING: Installed gaskets must have equal overlap on all enclosure panels to prevent fuel or vapor leaks from entering cabin.

(g) Place selector valve enclosure side panels and gaskets into position and secure with screws, washers and nuts.

CAUTION: Use care not to strain or bend attaching wires and components when lifting engine control panel.

(h) Carefully lift engine control panel just enough to allow installation of selector valve shaft. (i) Install screws securing engine control panel to center console. (j) Pressure check complete fuel system. (Refer to 28-10) (k) Inspect selector valve and enclosure for any signs of potential fuel leakage. (l) Install LH and RH mid console trim panels. (Refer to 25-10) (m) Install crew seats. (Refer to 25-10) (n) Connect battery 1. (Refer to 24-30)

EFFECTIVITY: Serials 0002 thru 0599 28-20 Page 9 15 Apr 2007 CIRRUS AIRPLANE MAINTENANCE MANUAL MODEL SR22

E. Selector Valve - Serials 0600 & subs (See Figure 28-203) (1) Removal - Selector Valve

WARNING: Disconnect the battery prior to servicing the selector valve.

(a) Disconnect battery 1. (Refer to 24-30) (b) Remove crew seats. (Refer to 25-10) (c) Remove LH and RH mid console trim panels. (Refer to 25-10) (d) Remove engine control panel from center console. 1 Remove flap switch assembly and LEDs from engine control panel. (Refer to 27-50) 2 Remove fuel pump switch from engine control panel. (Refer to 28-20) 3 Remove screw and nut securing power level knob to power lever. 4 Remove screw securing mixture control knob to mixture control lever. 5 Remove screw securing fuel selector knob to shaft of fuel selector valve. 6 Remove screws, washers, and nuts securing selector valve to engine control panel. 7 Disconnect fuel quantity indicator wire harness. 8 Remove screws, washers, and nuts securing engine control panel to center console. (e) Remove screws, washers and nuts securing panel and gasket to selector valve enclosure. (f) Remove screws securing top panel of selector valve enclosure. (g) Disconnect fuel supply and return lines from selector valve. (h) Remove screws securing selector valve to selector valve enclosure. (i) Remove selector valve assembly from airplane. (2) Installation - Selector Valve (a) Position selector valve assembly to enclosure and secure with screws. (b) Connect fuel supply and return lines to selector valve.

WARNING: Fuel line grommets seal fuel and vapors inside the selector valve enclosure. Ensure grommets are properly installed to prevent fuel from entering cabin.

(c) Verify fuel line grommets are flat against interior and exterior surfaces of the selector valve enclosure. (d) Place top panel of selector valve enclosure into position and secure with screws. (e) Place gasket and front panel of selector valve enclosure into position and secure with screws, washers, and nuts. (f) Install engine control panel to center console. 1 Install screws, washers, and nuts securing engine control panel to center console. 2 Connect fuel quantity indicator wire harness. 3 Install screws, washers, and nuts securing selector valve to engine control panel. 4 Install screw securing fuel selector knob to shaft of fuel selector valve. 5 Install screw securing mixture control knob to mixture control lever. 6 Install screw and nut securing power level knob to power lever. 7 Install fuel pump switch to engine control panel. (Refer to 28-20) 8 Install flap switch assembly and LEDs to engine control panel. (Refer to 27-50) (g) Pressure check complete fuel system. (Refer to 28-10) (h) Inspect selector valve and enclosure for any signs of potential fuel leakage. (i) Install LH and RH mid console trim panels. (Refer to 25-10) (j) Install crew seats. (Refer to 25-10) (k) Connect battery 1. (Refer to 24-30) EFFECTIVITY: 28-20 Serials 0600 & subs Page 10 15 Apr 2007 CIRRUS AIRPLANE MAINTENANCE MANUAL MODEL SR22

14 1

2 4 1 1

FIREWALL (REF)

5 23 2 3 3 6 2 22 1 9 13 2 17 1 2 21 2 2 18 2 2 1 1 3 19 8 13

1 18 2 15 2 17 16 15 16 2 LEGEND 1. Screw 3 13 2. Washer 3. Nut 4. Selector 2 5. Upper Detent Assembly 15 6. Shaft 12 7. Selector Valve 16 8. Top Panel 9. Front Panel 10. Side Panel 2 17 11. Gasket 2 2 13 3 12. Bottom Panel 1 18 13. Grommet 3 14. Switch 15. Return Line 20 21 16. Supply Line 17. Rivnut 19 1 18. Spring Clamp 18 19. Drain Tube 11 2 20. Cable Tie 10 Serials 0002 thru 0599. 17 21. Loop Clamp 22. Bracket 23. Fuel Enclosure, Firewall SR22_MM28_1129B

Figure 28-203 Fuel Selector Valve Installation - Serials 0002 thru 0599 (Sheet 1 of 2) EFFECTIVITY: Serials 0002 thru 0599 28-20 Page 11 15 Apr 2007 CIRRUS AIRPLANE MAINTENANCE MANUAL MODEL SR22

1 14

2 4 1 1

FIREWALL (REF)

5 22 2 1 3 13 6 17 13 2 21 18 2 1 1 2 19 1 2 1 3 8 9 18 11 2 7 1 17

16 16 15 15 LEGEND 1. Screw 15 2. Washer 17 3. Nut 16 4. Selector 5. Upper Detent Assembly 6. Shaft 7. Selector Valve 13 8. Top Panel 9. Front Panel 24 3 11. Gasket 2 13. Grommet 14. Switch 15. Return Line 2 16. Supply Line 18 1 17. Rivnut 18. Spring Clamp 19. Drain Tube 20 20. Cable Tie 21. Loop Clamp 22. Bracket 19 21 23. Fuel Enclosure, Firewall 18 24. Selector Valve Enclosure 2 17 SR22_MM28_1752

Figure 28-203 Fuel Selector Valve Installation - Serials 0600 & subs (Sheet 2 of 2) EFFECTIVITY: 28-20 Serials 0600 & subs Page 12 15 Apr 2007 CIRRUS AIRPLANE MAINTENANCE MANUAL MODEL SR22

F. Cabin Fuel System Fuel Enclosure (Firewall) (1) Removal - Cabin Fuel System Fuel Enclosure

WARNING: Disconnect the battery prior to servicing the selector valve.

(a) Disconnect battery 1. (Refer to 24-30) (b) Slide spring clamp downward on drain tube. (c) Disconnect drain tube from fitting on enclosure. (d) Remove screws and washers securing bracket, enclosure, and gasket to firewall. (e) Disconnect fuel supply and return lines from fittings inside fuel enclosure.

Note: To remove fuel enclosure from airplane, the fuel lines at the forward side of selector valve must be disconnected.

(f) Disconnect fuel supply and return lines from forward side of selector valve. (Refer to 28- 20) (g) Remove screws, washers, and nuts securing loop clamps to center console. (h) Slide fuel enclosure off fuel supply and return lines. (2) Installation - Cabin Fuel System Fuel Enclosure (a) Slide fuel enclosure over fuel supply and return lines. (b) Connect fuel enclosure supply and return fuel lines.

WARNING: Fuel line grommets seal fuel and vapors inside the selector valve enclosure. Ensure grommets are properly installed to prevent fuel from entering the cabin.

WARNING: Installed gaskets must have equal overlap on all enclosure panels to prevent fuel or vapor leaks from entering cabin.

(d) Position bracket, gasket, and enclosure to firewall and secure with screws and washers. (e) Slide drain tube over fitting on enclosure. (f) Slide spring clamp upward on drain tube until clamp is centered over fitting. (g) Connect fuel supply and return lines to forward side of selector valve. Reassemble selector valve enclosure. (Refer to 28-20) (h) Install screws, washers, and nuts securing loop clamps to center console. (i) Pressure check complete fuel system. (Refer to 28-10) (j) Inspect fuel enclosures for any signs of potential fuel leakage. (k) Connect battery 1. (Refer to 24-30)

EFFECTIVITY: All 28-20 Page 13 15 Apr 2007 CIRRUS AIRPLANE MAINTENANCE MANUAL MODEL SR22

G. Supply Tube Assembly (See Figure 28-204) (1) Removal - Supply Tube Assembly (a) Drain corresponding fuel tank for side being serviced. (Refer to 12-10) (b) Remove appropriate lower LH or RH wing root fairing. (Refer to 53-50)

CAUTION: Do not rotate 90° fuel tank fittings during removal of supply tube.

(c) Remove screw securing restraint clip to clamp on supply tube assembly. (d) Disconnect end fittings securing supply tube assembly to fuel line. Remove supply tube assembly. (2) Installation - Supply Tube Assembly

CAUTION: Do not rotate 90° fuel tank fittings during installation of supply tube.

(a) Serials 2043 & subs, Serials 0002 thru 2042 after SB 2X-28-05: At end fittings of fuel line, position supply tube assembly with HINGE label facing upward and flow arrow indicator pointing forward. (b) Install supply tube assembly to end fittings of fuel line. Torque nuts to 230 - 260 in-lb (25.98 - 29.37 Nm) and apply torque seal to both connections. (c) Position clamp on supply tube assembly at restraint clip. (d) Install screw securing restraint clip to clamp on supply tube assembly. (e) Fill the corresponding fuel tank. (Refer to 12-10) (f) Perform Functional Test - Bleed Fuel Lines. (Refer to 28-20)

CAUTION: To prevent damage from prop wash, removed wing root fairing must be fix- tured into installed positions.

(g) Using tarp tape, secure removed lower wing root fairing to installation location. (h) Perform Functional Test - Leak Check. (Refer to 28-20) (i) Install lower wing root fairing. (Refer to 53-50) (j) Perform Airplane Operational and Functional Check. (Refer to 05-30) (3) Functional Test - Bleed Fuel Lines (a) Set fuel selector valve to corresponding fuel tank for side being serviced. (b) Set electric fuel pump switch to PRIME position. (c) Hold open gascolator drain valve until fuel flows. (d) Set electric fuel pump switch to OFF position. (e) Verify supply tube assembly shows no signs of leakage. (4) Functional Test - Leak Check (a) Set fuel selector valve to corresponding fuel tank for the side being serviced. (b) Set BAT 1 switch to ON position. (c) Start engine in accordance with Pilot’s Operating Handbook procedures. (d) Allow continuous engine run-time for a minimum of three minutes. (e) Remove tape securing wing root fairings to airplane. (f) Check fuel line system. 1 Verify supply tube assembly shows no signs of leakage. 2 Verify any air is bled from fuel line system. (g) Shutdown engine in accordance with Pilot’s Operating Handbook procedures. (h) Set BAT 1 switch to OFF position.

EFFECTIVITY: 28-20 All Page 14 15 Apr 2007 CIRRUS AIRPLANE MAINTENANCE MANUAL MODEL SR22

3 4 3 2 1 FUEL LINE (REF)

6 7 8

LEGEND 1. Supply Tube Assembly 2. Screw 3. Washer 4. Clamp 5. Spacer 6. Check Valve 7. Union 8. Fitting

SR22_MM28_2399

Figure 28-204 Supply Tube Assembly Installation EFFECTIVITY: All 28-20 Page 15 15 Apr 2007 CIRRUS AIRPLANE MAINTENANCE MANUAL MODEL SR22

Intentionally Left Blank

EFFECTIVITY: 28-20 All Page 16 15 Apr 2007