BAe 125 Series 800
Flight Crew Air Transport Pilot (ATP)
Troubleshooting; Workload; Human-Machine Interface
Aircraft Equipment Problem Critical; Inflight Event / Encounter Weather / Turbulence
Flight Crew FLC complied w / Automation / Advisory; Flight Crew Returned To Departure Airport
Weather; Airport; Aircraft
We began to configure early for the approach and landing on Runway 15 in ASE. Upon selecting Flaps 15; the Stall Warning annunciator and Flap Annunciator illuminated. This indicated a flap asymmetry. We retracted the flaps; and requested a delay vector from Aspen Approach.  The flying pilot continued hand flying the aircraft while I consulted the checklist. The checklist indicated that  we would be required to do a flaps inoperative approach and landing. This would increase the landing  distance by 45%.  Due to the tailwind on the approach; the steepness of a normal approach in Aspen; the inability to fully configure to land; and the availability of a long runway pointed into the wind at out departure airport; we decided to return to our departure airport.  We changed our destination and were given a return clearance. After discussing the approach with my Captain; we requested vectors outside the final approach fix for the ILS. This would give us sufficient time to stabilize our speed and get configured before landing. The flight continued without any other issues.
We asked for delay vectors; looked up and accomplished the appropriate checklist; and made the decision together that a steep descent into Aspen and a landing with a 6 knot tailwind was ill advised. We then asked ATC for a return clearance. We returned to the departure airport and accomplished a no flap approach and landing without further event.
A BAE-125-850XP flight crew reported STALL IDENT and FLAP annunciations indicating a flap asymmetry during landing preparation at ASE and so after completing the QRH procedure they returned to the departure airport.