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A low oil pressure condition in flight will not cause an APU protective shut down. Gravity Oil Fill The APU oil sump can be filled through the gravity fill cap. The oil reservoir for the APU is an integral part of the accessory gearbox assembly and has a capacity of 5.25 quarts, with the add level at 3.75 quarts. The gravity fill is designed for a “fill to spill”ease of servicing and used only when the oil replenishment system does not function. OIL REPLENISHMENT SYSTEM The oil replenishment tank volume contains 5.7 liters (6 US quarts). APU oil level is measured via a sensor located in the APU oil tank which provides quantity information for the EICAS STAT page. Electrical failure of this sensor will be detected during the built-in-test and the quantity indicating value will change from a numerical value to amber dashes on EICAS. An APU OIL LO QTY advisory message will occur on EICAS (on ground only), when the APU oil level reaches approximately 3.5 US quarts and the APU has not been operating for 15 minutes. Volume 2 Flight Crew Operating Manual Rev 3, Apr 25, 2005 OIL REPLENISHMENT SYSTEM (CONT'D) An oil replenishment tank is located in the aft equipment bay and contains an electrical pump and sensor probe for quantity level. The oil replenishment (pressure filling) system is designed for ground use only and serves both main engines and APU. A three way electrical valve is incorporated in the replenishment system to allow transfer of oil to the system being topped up (either engine or APU). APU OIL TANK CKPT (°C) FWD CABIN (°C) AFT CABIN (°C) CAB ALT 1300 20 22 22 P 0.00 19 20 20 CAB RATE 000 OXYGEN 90 % LDG ELEV 000 OIL QTY (QTS) APU/ENGINE OIL REPLENISHMENT TANK 10.4 ENG APU RES 10.4 4.5 5.0 APU APU OIL QUANTITY RPM 100 EGT 650 Indicates APU oil tank BRAKE TEMP quantity in quarts. 03 03 03 03 NOTE are removed when the airplane is not onThe "APU" label and digital readout ground or APU is operating greater than 90% displayed RPM. GF0510_004 Rev 3, Apr 25, 2005 Flight Crew Operating Manual Volume 2 AUXILIARY POWER UNIT |
