START PANEL

Question 0

DESCRIBE THE L-ENG-R STOP SWITCH-LIGHTS.

Answer 0

L/R ENG STOP Switchlights manually terminate the engine start sequence.

Question 1

DESCRIBE THE L-ENG-R START SWITCH-LIGHTS.

Answer 1

L/R ENG START Switchlights initiate the engine start sequence. When START is illuminated it indicates the air turbine start valve is open. L(R) Status message is also displayed on EICAS.

Question 2

DESCRIBE THE SEQUENCE THAT OCCURS WHEN YOU PUSH THE START SWITCH.

Answer 2

The Start Sequence consists of the following steps once a start switchlight is pressed:
The left, right and isolation 10th stage SOV’s open
The start valve on the associated engine opens to allow pressure from the 10th stage manifold to engage the starter.
IGNITION A(B) advisory message appears on EICAS.
When the start valve opens, the associated START switchlight illuminates and the L or R ENGINE START message is displayed on EICAS.
At 55% N2 rpm electrical power is removed from the start valve and the starter disengages. The switchlight extinguishes and the EICAS message is removed.

Question 4

DESCRIBE THE ARM, ON, AND CONT-ON BUTTONS.

Answer 4

ARM – Arms respective ignition exciters.
ON – Indicates igniters are operating.
CONT – ON – Comes on both manually and automatically. Continuous ignition is supplied to both engines.
Both ignition systems are AC powered.
System A is powered by the AC essential bus.
System B is powered by the DC BATT BUS through a static inverter.
There are 3 ignition modes:
Normal – Prior to engine start the ignition is armed by either selecting ignition A or B. Ignition is then energized upon starter engagement and de-energized by starter cutout.
Continuous – Selected by pressing the CONT switchlight which energizes both ignition A and B.
Automatic – Automatic activation of continuous ignition is based upon the angle of attack data. Both ignition systems are activated by the stall warning computer and will remain on until the aircraft attitude is corrected.

Question 5

AT WHAT PERCENTAGE OF POWER N2 WILL THE STARTER CUT OUT?

Answer 5

55% N2.

Question 6

WHEN WILL CONTINUOUS IGNITION AUTOMATICALLY COME ON?

Answer 6

Both ignition systems are activated by the stall warning computer and will remain on until the aircraft attitude is corrected.

Question 7

WHEN DO YOU NEED CONTINUOUS IGNITION ON?

Answer 7

1. IN THE VICINITY OF THUNDERSTORMS
2. FOR TAKEOFF IN CROSSWINDS OF 15 KNOTS OR GREATER.
3. IN MODERATE OR HEAVIER INTENSITY TURBULENCE
4. IN MODERATE OR HEAVIER INTENSITY RAIN
5. WHEN OPERATING ON CONTAMINATED RUNWAYS.