Turning the autothrottles off prevents…
Climbing out of the ash could result in...
If volcanic dust fills the flight deck...
Setting idle thrust will result in…
Starting the APU...
Turning on anti-ice devices and air-conditioning packs…
c-will mean systems can be powered in
e- use flight deck oxygen at the 100 percent setting
b-increased engine debris build-up.
f-will improve the engine stall margins.
d- engines continuing to produce electrical power, bleed ait, and hydraulic power.
a-the engines from increasing thrust automatically above idlie.