Bell 412 Fuel System 10 Tank layout 120

Bell 412 Fuel System (10 Tank layout) 120 80 80 40 FUEL REMAINING 0 2145 Take-Off at 1700 FUEL QTY LLBS X 100 Understanding what happens when fuel burns off. Example: Full Fuel at 2154 LBS, using 12 LBS per minute. 2 Pilots 5 Pax Boot 100 LBS T/O WT 11, 280 LBS CG 136” @ T/O Burn 1 245 LBS Fuel is initially used from the Upper Tanks Burn 4 212 LBS Burn 2 321 LBS Burn 3 464 LBS Burn 5 538 LBS Burn 6 374 LBS 12000 110000 9000 8000 LBS Not to Scale For Illustration purposes only FWD Tank MID Tank AFT Tank Fuel is transferred from the FWD tank to the MID tank, then to the MAIN. To Engines 130 134 138 Ocean Training Systems 140 144

Bell 412 Fuel System (10 Tank layout) 120 80 80 40 FUEL REMAINING 0 2020 FUEL QTY LLBS X 100 Take-Off at 1700 Flight Time 10 MINS Fuel used 120 LBS Understanding what happens when fuel burns off. Example: Full Fuel at 2154 LBS, using 12 LBS per minute. 2 Pilots 5 Pax Boot 100 LBS T/O WT 11, 280 LBS CG 136” @ T/O Burn 1 245 LBS Fuel is initially used from the Upper Tanks Burn 4 212 LBS Burn 2 321 LBS Burn 3 464 LBS Burn 5 538 LBS Burn 6 374 LBS 12000 110000 9000 8000 LBS Not to Scale For Illustration purposes only FWD Tank MID Tank AFT Tank Fuel is transferred from the FWD tank to the MID tank, then to the MAIN. To Engines 130 134 138 Ocean Training Systems 140 144

Bell 412 Fuel System (10 Tank layout) 120 80 80 40 FUEL REMAINING 0 1914 FUEL QTY LLBS X 100 Take-Off at 1700 Flight Time 20 MINS Fuel used 240 LBS Understanding what happens when fuel burns off. Example: Full Fuel at 2154 LBS, using 12 LBS per minute. 2 Pilots 5 Pax Boot 100 LBS T/O WT 11, 280 LBS CG 136” @ T/O As first stand pipe is uncovered, fuel is then used from the MID tanks. Burn 1 245 LBS Burn 3 464 LBS Burn 4 212 LBS Burn 2 321 LBS Burn 5 538 LBS Burn 6 374 LBS 12000 110000 9000 8000 LBS Not to Scale For Illustration purposes only FWD Tank MID Tank AFT Tank Fuel is transferred from the FWD tank to the MID tank, then to the MAIN. To Engines 130 134 138 Ocean Training Systems 140 144

Bell 412 Fuel System (10 Tank layout) 120 80 80 40 FUEL REMAINING 0 1794 FUEL QTY LLBS X 100 Take-Off at 1700 Flight Time 30 MINS Fuel used 360 LBS Understanding what happens when fuel burns off. Example: Full Fuel at 2154 LBS, using 12 LBS per minute. 2 Pilots 5 Pax Boot 100 LBS T/O WT 11, 280 LBS CG 136” @ T/O As first stand pipe is uncovered, fuel is then used from the MID tanks. Burn 1 245 LBS Burn 3 464 LBS Burn 4 212 LBS Burn 2 321 LBS Burn 5 538 LBS Burn 6 374 LBS 12000 110000 9000 8000 LBS Not to Scale For Illustration purposes only FWD Tank MID Tank AFT Tank Fuel is transferred from the FWD tank to the MID tank, then to the MAIN. To Engines 130 134 138 Ocean Training Systems 140 144

Bell 412 Fuel System (10 Tank layout) 120 80 80 40 FUEL REMAINING 0 1674 FUEL QTY LLBS X 100 Take-Off at 1700 Flight Time 40 MINS Fuel used 480 LBS Understanding what happens when fuel burns off. Example: Full Fuel at 2154 LBS, using 12 LBS per minute. 2 Pilots 5 Pax Boot 100 LBS T/O WT 11, 280 LBS CG 136” @ T/O As first stand pipe is uncovered, fuel is then used from the MID tanks. Burn 1 245 LBS Burn 3 464 LBS Burn 4 212 LBS Burn 2 321 LBS Burn 5 538 LBS Burn 6 374 LBS 12000 110000 9000 8000 LBS Not to Scale For Illustration purposes only FWD Tank MID Tank AFT Tank Fuel is transferred from the FWD tank to the MID tank, then to the MAIN. To Engines 130 134 138 Ocean Training Systems 140 144

Bell 412 Fuel System (10 Tank layout) 120 80 80 40 FUEL REMAINING 0 1554 FUEL QTY LLBS X 100 Take-Off at 1700 Flight Time 50 MINS Fuel used 600 LBS Understanding what happens when fuel burns off. Example: Full Fuel at 2154 LBS, using 12 LBS per minute. 2 Pilots 5 Pax Boot 100 LBS T/O WT 11, 280 LBS CG 136” @ T/O Burn 1 245 LBS When the MID tanks are depleted, the next burn is from the Upper tanks again Burn 4 212 LBS Burn 2 321 LBS Burn 3 464 LBS Burn 5 538 LBS Burn 6 374 LBS EMPTY FWD Tank MID Tank 12000 110000 9000 8000 LBS Not to Scale For Illustration purposes only AFT Tank Fuel is transferred from the FWD tank to the MID tank, then to the MAIN. To Engines 130 134 138 Ocean Training Systems 140 144

Bell 412 Fuel System (10 Tank layout) 120 80 80 40 FUEL REMAINING 0 1434 FUEL QTY LLBS X 100 Take-Off at 1700 Flight Time 60 MINS Fuel used 720 LBS Understanding what happens when fuel burns off. Example: Full Fuel at 2154 LBS, using 12 LBS per minute. 2 Pilots 5 Pax Boot 100 LBS T/O WT 11, 280 LBS CG 136” @ T/O Burn 1 245 LBS When the MID tanks are depleted, the next burn is from the Upper tanks again Burn 4 212 LBS Burn 2 321 LBS Burn 3 464 LBS Burn 5 538 LBS Burn 6 374 LBS EMPTY FWD Tank MID Tank 12000 110000 9000 8000 LBS Not to Scale For Illustration purposes only AFT Tank Fuel is transferred from the FWD tank to the MID tank, then to the MAIN. To Engines 130 134 138 Ocean Training Systems 140 144

Bell 412 Fuel System (10 Tank layout) 120 80 80 40 FUEL REMAINING 0 1314 FUEL QTY LLBS X 100 Take-Off at 1700 Flight Time 70 MINS Fuel used 840 LBS Understanding what happens when fuel burns off. Example: Full Fuel at 2154 LBS, using 12 LBS per minute. 2 Pilots 5 Pax Boot 100 LBS T/O WT 11, 280 LBS CG 136” @ T/O Burn 1 245 LBS When the MID tanks are depleted, the next burn is from the Upper tanks again Burn 4 212 LBS Burn 2 321 LBS Burn 3 464 LBS Burn 5 538 LBS Burn 6 374 LBS EMPTY FWD Tank MID Tank 12000 110000 9000 8000 LBS Not to Scale For Illustration purposes only MAIN AFT Tank Fuel is transferred from the FWD tank to the MID tank, then to the MAIN. To Engines 130 134 138 Ocean Training Systems 140 144

Bell 412 Fuel System (10 Tank layout) 120 80 80 40 FUEL REMAINING 0 1194 FUEL QTY LLBS X 100 Take-Off at 1700 Flight Time 80 MINS Fuel used 960 LBS Understanding what happens when fuel burns off. Example: Full Fuel at 2154 LBS, using 12 LBS per minute. 2 Pilots 5 Pax Boot 100 LBS T/O WT 11, 280 LBS CG 136” @ T/O Burn 1 245 LBS When the MID tanks are depleted, the next burn is from the Upper tanks again Burn 4 212 LBS Burn 2 321 LBS Burn 3 464 LBS Burn 5 538 LBS Burn 6 374 LBS EMPTY FWD Tank MID Tank 12000 110000 9000 8000 LBS Not to Scale For Illustration purposes only AFT Tank Fuel is transferred from the FWD tank to the MID tank, then to the MAIN. To Engines 130 134 138 Ocean Training Systems 140 144

Bell 412 Fuel System (10 Tank layout) 120 80 80 40 FUEL REMAINING 0 1074 FUEL QTY LLBS X 100 Take-Off at 1700 Flight Time 90 MINS Fuel used 1080 LBS Understanding what happens when fuel burns off. Example: Full Fuel at 2154 LBS, using 12 LBS per minute. 2 Pilots 5 Pax Boot 100 LBS T/O WT 11, 280 LBS CG 136” @ T/O the next Upper tank stand pipe is uncovered, the fuel burn is then from the FWD tanks. Burn 4 212 LBS Burn 2 321 LBS Burn 1 245 LBS Burn 3 464 LBS Burn 5 538 LBS Burn 6 374 LBS EMPTY FWD Tank MID Tank 12000 110000 9000 8000 LBS Not to Scale For Illustration purposes only AFT Tank Fuel is transferred from the FWD tank to the MID tank, then to the MAIN. To Engines 130 134 138 Ocean Training Systems 140 144

Bell 412 Fuel System (10 Tank layout) 120 80 80 40 FUEL REMAINING 0 954 FUEL QTY LLBS X 100 Take-Off at 1700 Flight Time 100 MINS Fuel used 1200 LBS Understanding what happens when fuel burns off. Example: Full Fuel at 2154 LBS, using 12 Turn TRANSFER LBS per minute. SWITCHES to OFF 2 Pilots 5 Pax Boot 100 LBS T/O WT 11, 280 LBS CG 136” @ T/O the next Upper tank stand pipe is uncovered, the fuel burn is then from the FWD tanks. Burn 4 212 LBS Burn 2 321 LBS Burn 1 245 LBS Burn 3 464 LBS Burn 5 538 LBS Burn 6 374 LBS EMPTY FWD Tank MID Tank 12000 110000 9000 8000 LBS Not to Scale For Illustration purposes only AFT Tank Fuel is transferred from the FWD tank to the MID tank, then to the MAIN. To Engines 130 134 138 Ocean Training Systems 140 144

Bell 412 Fuel System (10 Tank layout) 120 80 80 40 FUEL REMAINING 0 834 FUEL QTY LLBS X 100 Take-Off at 1700 Flight Time 110 MINS Fuel used 1320 LBS Understanding what happens when fuel burns off. Example: Full Fuel at 2154 LBS, using 12 LBS per minute. 2 Pilots 5 Pax Boot 100 LBS T/O WT 11, 280 LBS CG 136” @ T/O TRANS Burn 1 245 LBS As the FWD tanks are emptied, the fuel burn is transferred back to the Upper tanks. Burn 4 212 LBS Burn 2 321 LBS EMPTY FWD Tank MID Tank Burn 5 538 LBS Burn 6 374 LBS X X Burn 3 464 LBS 12000 110000 9000 8000 LBS Not to Scale For Illustration purposes only AFT Tank Fuel is transferred from the FWD tank to the MID tank, then to the MAIN. To Engines 130 134 138 Ocean Training Systems 140 144

Bell 412 Fuel System (10 Tank layout) 120 80 80 40 FUEL REMAINING 0 714 FUEL QTY LLBS X 100 Take-Off at 1700 Flight Time 120 MINS Fuel used 1440 LBS Understanding what happens when fuel burns off. Example: Full Fuel at 2154 LBS, using 12 LBS per minute. 2 Pilots 5 Pax Boot 100 LBS T/O WT 11, 280 LBS CG 136” @ T/O Burn 1 245 LBS As the FWD tanks are emptied, the fuel burn is transferred back to the Upper tanks. Burn 4 212 LBS Burn 2 321 LBS EMPTY FWD Tank MID Tank Burn 3 464 LBS Burn 5 538 LBS Burn 6 374 LBS 12000 110000 9000 8000 LBS Not to Scale For Illustration purposes only AFT Tank Fuel is transferred from the FWD tank to the MID tank, then to the MAIN. To Engines 130 134 138 Ocean Training Systems 140 144

Bell 412 Fuel System (10 Tank layout) 120 80 80 40 FUEL REMAINING 0 594 FUEL QTY LLBS X 100 Take-Off at 1700 Flight Time 130 MINS Fuel used 1560 LBS Understanding what happens when fuel burns off. Example: Full Fuel at 2154 LBS, using 12 LBS per minute. 2 Pilots 5 Pax Boot 100 LBS T/O WT 11, 280 LBS CG 136” @ T/O Burn 1 245 LBS As the FWD tanks are emptied, the fuel burn is transferred back to the Upper tanks. Burn 4 212 LBS Burn 2 321 LBS EMPTY FWD Tank MID Tank Burn 3 464 LBS Burn 5 538 LBS Burn 6 374 LBS 12000 110000 9000 8000 LBS Not to Scale For Illustration purposes only AFT Tank Fuel is transferred from the FWD tank to the MID tank, then to the MAIN. To Engines 130 134 138 Ocean Training Systems 140 144

Bell 412 Fuel System (10 Tank layout) 120 80 80 40 FUEL REMAINING 0 474 FUEL QTY LLBS X 100 Take-Off at 1700 Flight Time 140 MINS Fuel used 1680 LBS Understanding what happens when fuel burns off. Example: Full Fuel at 2154 LBS, using 12 LBS per minute. 2 Pilots 5 Pax Boot 100 LBS T/O WT 11, 280 LBS CG 136” @ T/O Burn 1 245 LBS As the FWD tanks are emptied, the fuel burn is transferred back to the Upper tanks. Burn 4 212 LBS Burn 2 321 LBS EMPTY FWD Tank MID Tank Burn 3 464 LBS Burn 5 538 LBS Burn 6 374 LBS 12000 110000 9000 8000 LBS Not to Scale For Illustration purposes only AFT Tank Fuel is transferred from the FWD tank to the MID tank, then to the MAIN. To Engines 130 134 138 Ocean Training Systems 140 144

Bell 412 Fuel System (10 Tank layout) 120 80 80 40 FUEL REMAINING 0 380 FUEL QTY LLBS X 100 Take-Off at 1700 Flight Time 140 MINS Fuel used 1680 LBS Understanding what happens when fuel burns off. Example: Full Fuel at 2154 LBS, using 12 LBS per minute. 2 Pilots 5 Pax Fuel Low light illuminates at 380 lbs Boot 100 LBS Followed by the Interconnect light. T/O WT 11, 280 LBS CG 136” @ T/O Burn 1 245 LBS As the Upper tanks are nearly empty, the low fuel warning light will illuminate. Burn 4 212 LBS Burn 2 321 LBS EMPTY FWD Tank MID Tank INTCON FUEL LOW Burn 3 464 LBS Burn 5 538 LBS Burn 6 374 LBS 12000 110000 9000 8000 LBS Not to Scale For Illustration purposes only AFT Tank Fuel is transferred from the FWD tank to the MID tank, then to the MAIN. To Engines 130 134 138 Ocean Training Systems 140 144

Bell 412 Fuel System (10 Tank layout) 120 80 80 40 FUEL REMAINING 0 294 FUEL QTY LLBS X 100 Take-Off at 1700 Flight Time 155 MINS Fuel used 1800 LBS. Helicopter lands with 25 minutes of fuel left. Understanding what happens when fuel burns off. Example: Full Fuel at 2154 LBS, using 12 Turn INTCON to OPEN LBS per minute. and check TRANSFER 2 Pilots SWITCHES are OFF 5 Pax Fuel Low light illuminates at 380 lbs Boot 100 LBS Followed by the Interconnect light. T/O WT 11, 280 LBS CG 136” @ T/O Burn 1 245 LBS Once the Upper tanks are empty, there is only fuel left in the lower mains. (374 LBS) Burn 4 212 LBS Burn 2 321 LBS EMPTY FWD Tank MID Tank Burn 6 374 LBS FUEL LOW Burn 3 464 LBS EMPTY Burn 5 538 LBS OFF OPEN 12000 110000 9000 8000 LBS Not to Scale For Illustration purposes only AFT Tank Fuel is transferred from the FWD tank to the MID tank, then to the MAIN. To Engines 130 134 138 Ocean Training Systems 140 144

Bell 412 Fuel System (10 Tank layout) 120 80 80 40 FUEL REMAINING 294 FUEL QTY LLBS X 100 Take-Off at 1700 Flight Time 155 MINS Fuel used 1800 LBS. Helicopter lands with 25 minutes of fuel left. 0 Understanding what happens when fuel burns off. Example: Full Fuel at 2154 LBS, using 12 LBS per minute. 2 Pilots 5 Pax Boot 100 LBS T/O WT 11, 280 LBS CG 136” @ T/O Helicopter arrives safely and within C. of G. Not to Scale For Illustration purposes only 130 134 138 Ocean Training Systems 140 144

Bell 412 Fuel System (10 Tank layout) FUEL Summary: Full Fuel 2154 LBS Normal, no Transfer problems. 1955 LBS 1611 LBS BURN 1 1147 LBS Upper Tank 928 LBS CG 386 LBS EMPTY FWD CG AFT CG Ocean Training Systems

Bell 412 Fuel System (10 Tank layout) FUEL Summary: Full Fuel 2154 LBS Normal, no Transfer problems. 1955 LBS 1611 LBS BURN 2 1147 LBS Lower MID Tank 928 LBS CG 386 LBS EMPTY FWD CG AFT CG Ocean Training Systems

Bell 412 Fuel System (10 Tank layout) FUEL Summary: Full Fuel 2154 LBS Normal, no Transfer problems. 1955 LBS 1611 LBS BURN 3 1147 LBS Upper Tank 928 LBS CG 386 LBS EMPTY FWD CG AFT CG Ocean Training Systems

Bell 412 Fuel System (10 Tank layout) FUEL Summary: Full Fuel 2154 LBS Normal, no Transfer problems. 1955 LBS 1611 LBS BURN 4 1147 LBS Lower FWD Tank 928 LBS CG 386 LBS EMPTY FWD CG AFT CG Ocean Training Systems

Bell 412 Fuel System (10 Tank layout) FUEL Summary: Full Fuel 2154 LBS Normal, no Transfer problems. 1955 LBS 1611 LBS BURN 5 1147 LBS Upper Tank 928 LBS CG 386 LBS EMPTY FWD CG AFT CG Ocean Training Systems

Bell 412 Fuel System (10 Tank layout) FUEL Summary: Full Fuel 2154 LBS Normal, no Transfer problems. 1955 LBS 1611 LBS BURN 6 1147 LBS Lower Main Tank 928 LBS CG 386 LBS EMPTY FWD CG AFT CG Ocean Training Systems

Bell 412 Fuel System (10 Tank layout) FUEL Transfer Problems 1. The Upper Fuel Tanks supply fuel to the Lower Tanks. 2. A Transfer Pump and Ejector Pump then transfer Fuel to the Lower AFT Tank 3. The FWD and MID tanks cannot Gravity Feed into the AFT Tanks. 4. The Main Boost Pumps are located in the Lower AFT Tanks and supply Fuel to the Engines. Full Fuel 2154 LBS 1955 LBS 1611 LBS 1147 LBS 928 LBS 386 LBS EMPTY FWD CG AFT CG Ocean Training Systems

Bell 412 Fuel System (10 Tank layout) FUEL Transfer Problems 1. If the FUEL TRANSFER Pumps both fail, the Fuel in the FWD and MID Tanks will not be available. 2. A total loss of electrical power to the Fuel QTY / Thermistor circuits will result in a total loss of: a. FUEL QTY Gauges b. FUEL XFER capability. C. FUEL LOW Warning. 3. CG may move FWD outside limits. Full Fuel 2154 LBS 1955 LBS 1611 LBS 1147 LBS 928 LBS 386 LBS EMPTY FWD CG AFT CG Ocean Training Systems

Bell 412 Fuel System (10 Tank layout) FUEL Transfer Problems Full Fuel 2154 LBS 1. In the worst case, 533 LBS of fuel will not be available. 2. 1621 LBS would be available if the A/C was full of fuel. 1955 LBS 1611 LBS 1147 LBS CG may fall outside forward limits if Fuel does not transfer. 533 LBS 386 LBS EMPTY FWD CG AFT CG Ocean Training Systems

Bell 412 Fuel System (10 Tank layout) FUEL Summary: 1. The most AFT CG is when the Tanks are all full. 2. The most FWD CG is when the Tanks are nearly empty. 3. The A/C will be at it’s most forward CG when operating with: a. 2 Pilots b. 9 -11 Pax c. No load in Boot 4. FWD CG may be exceeded if the FWD Fuel cells fail to transfer fuel and the Lower and Mid cells remain full. 5. AFT CG may easily be exceeded with heavy boot loads. IE: 2 Pilots and 200 LBS in Boot, full fuel. Menu Ocean Training Systems Back Next