Basically you lose protections
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Manual Start:
Aircraft configuration:
- APU is running and APU bleed air is available.
When the mode selector is set to IGN START, the
Electronic Engine Control is armed for the start
sequence.
Action on the engine MAN START pushbutton provides
opening of the start valve, via the EEC.
On the upper ECAM display, check N2 increasing and
when it reaches 18%, set the MASTER lever to ON.
As soon as the MASTER lever is in the ON position,
both ignition systems are energized, LP, and
PR Shut
Off Valves are opened and fuel flow increases.
At 18% of N2 with the MASTER lever ON:
- Dual ignition and fuel flow.
The MAN START pushbutton stays latched and is normally
left alone during the start sequence.
Action of the MAN START pushbutton has no effect on
the start sequence as long as the MASTER lever is set
in the ON position.
The MAN START pushbutton is normally released at the
end when the engine parameters are stabilized.
In case of malfunction, set the MASTER lever in the
OFF position to abort the start.
Max EGT:
- Starting, for up to 2 minutes, 590 degrees C.
- Transient 635 degrees C.
NOTE: There is no automatic shut down function.