"A mate with QF said he tried it the other day pneumatics and electrics and the system went into Primary Electric for LE and TE (400) said something about the FCU only knows Normal,Primary Elec and Sec Elec so once the TE is Primary Elec then so is the LE ?"
The strange thing is, I tried it today on a Qantas 400 (in response to this message), and the leading edges did deploy pneumatically (VH-OJU).
The situation was this:
Bleed air coming from the APU _with Bleed Isolation Valves open_.
All hydraulic pumps off.
All circuit breakers set.
Flaps 1 selected:
LE flaps (inboard) deployed in less than 10 seconds (definitely not electric). An observer on the ground also confirmed the flaps were making pneumatic sounds).
Then... Flaps 5 selected:
Leading edge flaps(remaining ones) deployed pneumatically in basically the same time period. The Upper EICAS showed an expanded flap display (reflecting that the TE flaps had gone into Primary Electric mode).
Perhaps your mate had forgotten something (CB's, Isolation Valves)?
Note that the Classic logic varies from this.
Rgds.
Q.