MCDU USE When clear for start up and taxi, the PF will preferably display the MCDU PERF TAKE OFF page whereas the PNF will display the MCDU F-PLN page. Engines usually start using the Automatic Starting function. The Full Authority Digital Engine Control (FADEC) systems control this engine Automatic Starting function, and takes appropriate action, if engine parameters are exceeded. This function extends significantly the duration of engine life. The thrust levers must be confirmed at ”idle” before engine-start. If the thrust levers are not at ”idle”, the thrust increases above idle after engine-start, and can result in a hazardous situation. However, an ENG START FAULT ECAM warning triggers, to indicate that the flight crew must set the thrust levers to ”idle”. The engines are started in sequence, preferably engine 2 first, in order to pressurize yellow hydraulic system, which supplies the parking brake accumulator. When the ENG START selector is set to ”START”, the FADECs are electrically- supplied. When there is sufficient BLEED PRESS, the PF begins the start sequence by setting the ENG MASTER switch to ON. The flight crew should monitor the start sequence: - Start valve opens - N2 increases - IGN A(B) - Fuel flow - EGT - N1 - Oil pressure increases - Start valve closes - IGN indication off After reaching the peak EGT, or when AVAIL is displayed, the PF can start engine 1. The flight crew should check the relative engine vibration level. When the ENG START selector is set to NORM, the packs return to the OPEN position. APU Bleed should immediately be turned off, to avoid engine ingestion of exhaust gas. If the start is not successful, the flight crew must use the ECAM as usually done, and avoid instinctively selecting the ENG MASTER switch to OFF. This would interrupt the FADEC protective actions (e. g. cranking after hot start). As soon as the engine-start is complete, the flight crew should check the stabilized parameters. At ISA sea level: N1 about 19.5 % N2 about 58.5 % EGT about 390 ̊C FF about 275 kg/h- 600 lb/h
Posted on: Tue, 11 Jun 2013 18:24:09 +0000