Originally Posted by
Black Pudding
Having to do a manual start if the outside temp is 40 degrees or above. How does doing a manual start differ from an automatic start to make this option more suitable. What's the mechanics of the system that makes it a better option.
I’m not an engineer nor an expert but that’s how I undestand it.
Talking for the A320 with IAE engines.
I just did one 2 days ago cause we had 20+ knots tailwind. First you have the 2 ignitions A&B instead of only 1 during a normal start. And also you only put master switch ON to send fuel to in the combustion chamber when N2 is >16% and at least 30 seconds after starter has kicked in. You must have both these conditions before putting the master switch to ON. Also manual engine start offers you the option to increase the bleed pressure in case the N2 is too low. On automatic start, it will attemps to start the engine after 30 seconds regardless of the N2. So if you had low bleed pressure and/or strong N2 counter rotation, an automatic start might fail.