After ENGINE START switch has been selected to GRD, which indication shows the EEC is performing BRM?

After ENGINE START switch has been selected to GRD, which indication shows the EEC is performing BRM?

• A. MOTORING is displayed on the N2 gauge between 18% and 24% N2
• B. N2 gauge shows 0%
• C. EEC alert
• D. APU status annunciator

Answer: (A)

When you set the ENGINE START switch to GRD, the engine control logic may put the engine into a motoring start state (BRM) where the starter motor turns the engine without combustion to reach the proper ignition conditions. The clear sign of this BRM action is the N2 rotor turning in the motoring range, typically shown as motoring on the N2 gauge between about 18% and 24% N2. This indicates the engine is being spun by the starter, not yet firing fuel. Other indicators wouldn’t fit BRM: showing 0% N2 means the engine isn’t turning, which isn’t BRM; an EEC alert would indicate a fault rather than the normal BRM start condition; and the APU status annunciator reflects overall APU status, not a specific BRM motoring state.

When you set the ENGINE START switch to GRD, the engine control logic may put the engine into a motoring start state (BRM) where the starter motor turns the engine without combustion to reach the proper ignition conditions. The clear sign of this BRM action is the N2 rotor turning in the motoring range, typically shown as motoring on the N2 gauge between about 18% and 24% N2. This indicates the engine is being spun by the starter, not yet firing fuel.

Other indicators wouldn’t fit BRM: showing 0% N2 means the engine isn’t turning, which isn’t BRM; an EEC alert would indicate a fault rather than the normal BRM start condition; and the APU status annunciator reflects overall APU status, not a specific BRM motoring state.