B767-300 and 300 ER
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical
Flight Crew Landed in Emergency Condition; General Declared Emergency
Aircraft
During test flight we tried to actuate the alternate flaps and got a Leading Edge Slat Disagree.  We complied with checklist and tried to extend the trailing edge which also gave us a Trailing Disagree.  We were unable to extend the Slats/Flaps using normal or alternate procedures. Declared an emergency and burned off some fuel to reduce our final approach speeds.  Made a 'practice' No Flap/No Slat approach/Go-around for familiarization of pitch and roll characteristics; came back and landed.  After landing noticed that only the outboard leading edge slats were extended. Unknown what caused the malfunction.
[Report narrative contained no additional information]
B767-300F flight crew reported LE and TE flaps and slats would not extend on approach. An emergency was declared and a zero flap approach and landing safely flown.