Check on Emergency Horizon

·Engage circuit breakers A4 on 4α panel and G2 on 5α panel.Check the working status of the emergency horizon.In normal temperature(5-20℃),the failure warning flag of the emergency horizon shall retract within 3 minutes;

·Pull out the resetting knob of the emergency horizon to zero it and the failure warning flag shall appear.Release the resetting knob and the failure warning flag shall disappear while the horizon remains zeroed;

·Disengage the circuit breakers and the failure warning flag re-appears.

Note:Check the following aspects 3 minutes after the gyro horizon is powered on:

·The artificial horizon shall be within the central circle of the aircraft symbol;

·Pitch angle indicator and bank angle indicator shall cross correctly within the central circle of the aircraft symbol;

·When the pitch angle indicator is parallel with the aircraft symbol,the depth of parallelism shall not exceed±3mm.The bank angle indicator shall not deviate from the zero scale mark by more than±3mm.