Outline the typical engine start sequence on the A320 when using APU bleed air.

• A. APU bleed is used only for cabin pressurization; engine start sequence is unchanged.
• B. APU bleed is selected; engine start switch is activated; monitor N1, EGT, and oil pressure; confirm stable idle and normal parameters.
• C. Engine start switch is activated; monitor airspeed.
• D. APU bleed is selected; engine start switch is activated; coast into idle without monitoring.

Answer: (B)

When starting an engine with APU bleed air, you first enable the APU bleed to supply pneumatic air, then initiate the engine start with the engine start switch, and critically monitor the engine parameters as it spools up. You watch N1 to confirm the spool is accelerating, EGT to ensure proper combustion, and oil pressure to verify lubrication as the engine comes onto idle. This sequence ensures the engine is starting correctly and will reach a normal idle with acceptable parameters.

The option that includes selecting APU bleed, activating the engine start switch, and monitoring N1, EGT, and oil pressure until stable idle is reached is the correct approach because it reflects both supplying the bleed air source and actively validating the engine’s start progress. The other descriptions are not accurate: one overstates the role of APU bleed (being used only for cabin pressurization), one omits key monitoring (airspeed is not a start parameter), and one suggests coasting into idle without monitoring, which is unsafe and incorrect.