Date: 201311
Local time of day: 0001-0600
Location: ZZZ.Airport, US
Flight conditions: VMC
Weather elements / visibility: Turbulence
Light: Night
Aircraft: A319
Operator: Air Carrier
Operating under: Part 121
Mission: Passenger
Flight phase: Takeoff / Launch
Airspace: Class B ZZZ
ATC / advisory: Tower ZZZ
Aircraft component: Nacelle/Pylon Main Structure
Component problem: Malfunctioning
Reporter organization: Air Carrier
Reporter function: Pilot Flying; Captain
Reporter qualification: Flight Crew Air Transport Pilot (ATP)
Second reporter function: Pilot Not Flying; First Officer
Anomaly: Aircraft Equipment Problem Critical
Detector: Person Passenger
When detected: In-flight
Result: Aircraft Aircraft Damaged; Flight Crew Returned To Departure Airport; General Maintenance Action
Contributing factors: Aircraft
Primary problem: Aircraft

Narrative: Upon reaching the aircraft we both began our preflight of aircraft. I personally reviewed the logbook and noted that the aircraft had just come out of a weekly inspection. I also noted all maintenance items were signed off as complete. My First Officer also reviewed the logbook and we discussed that an oil service was done to both engines. We had a normal taxi and completed all checklists before departure. The takeoff was uneventful with gusty winds and we climbed to 5;000 FT. At that point; the Lead Flight Attendant called us and informed us that a passenger had informed her that 'a panel had come off the right wing.' I had the First Officer tell her to get verification from the flight attendants that they did see a problem. Moments later; the Lead Flight Attendant called back and verified that 'wires and pipes' were exposed on the right wing. [The First Officer] and I briefly discussed the situation and agreed that we should return to the airport for an inspection. [First Officer] notified ATC of our intentions and shortly afterward I declared an emergency to ATC. [First Officer] was very busy running landing data; contacting Dispatch; and running checklists while I was flying the aircraft and talking to ATC. I also notified ATC that they should inspect [the runway] for possible debris. We set up for the [the approach] and discussed the overweight landing. The landing was uneventful. We ran the after landing checklist and secured the Number 2 Engine. I then contacted the fire commander and requested that they inspect the aircraft for visible damage. The Fire Commander called us back and confirmed that the Number 2 Engine was damaged he also recommended that the aircraft be towed back to the gate.After getting this information we secured the number one engine as well. It took some time to arrange a tow back to the gate. We kept the passengers informed during the entire event. Upon arrival at the gate; we ran the parking checklist and I made entries into the logbook for the Number 2 Engine cowl departing the aircraft in flight and for the overweight landing. My First Officer did an excellent job during the entire event; his work load was very heavy in a short amount of time and he performed flawlessly. In addition; our cabin crew did an excellent job with communication and keeping the passengers calm and quickly preparing for landing.


Second narrative: I went outside and performed the aircraft preflight and gave the fueler the OK to fuel. All panels; doors and latches appeared secured and closed correctly including the 4 latches that were flush underneath each engine cowl.[After landing] I went outside to perform the post flight exterior check and found the inboard and outboard engine cowl missing and visible damage to the vertical stab on the leading edge.


Synopsis: A319 flight crew reported they were notified by a Flight Attendant that a passenger had pointed out missing skin in the area of Number 2 Engine. Flight declared an emergency and returned to departure airport; where postflight inspection revealed the Number 2 Engine cowl had departed the aircraft in flight.