Narrative:

I and my student were scheduled to fly in BE76 at XA00 from ZZZ airport in order to carry out a range of flight maneuver. The student carried out the initial preflight on the airplane which he conducted in accordance with the checklist. He established during the walkaround that the airplane oil level indicated 6 quarts and that the fuel tanks contained 50 gallons each side. He stated to me that there was no water in the tank and that he had checked the landing gear. Then I carried out a secondary walkaround following the first. Then we got in the cockpit and did our checklist start of the right engine; then the left engine. Departure from ZZZ was perfectly normal and in accordance with local procedures for a southwest VFR departure. After our departure to the southwest; we leveled off at 2000 ft. I told my student to set the airplane up for performance slow flight in the takeoff configuration. This he did. I then told my student to fly heading of 360 degrees and he carried out the turn. Then I asked for slow flight in the landing configuration. As he reduced the power to 12 inches manifold pressure to reduce airspeed to 100 knots; he put the gear down; then as airspeed reduced to 85 KTS he put flaps down -- at which point the outer half of the right flap detached from the airplane and was bent upwards. I took control of the aircraft and selected flaps back up but it now appeared they were stuck -- and the outer half of the right flap remained upward at 90 degrees to the normal position. By now the airplane was rolling and yawing to the right and losing altitude at about 200 feet per minute at the same time. I had to reduce the left engine power to maintain a wings level attitude. I decided to recover to ZZZ airport and contacted tower. I informed them that my right flap had detached from the wing. Tower asked if I wanted to declare an emergency; I affirmed because I could not maintain altitude. Tower asked the number on board to which I replied '2' and told them that I still had around 80 gallons of fuel in the tanks. Tower offered me the runway of my choice and I opted for a straight-in approach on runway xx. I landed safely without any further damage to aircraft or the runway environment.

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Original NASA ASRS Text

Title: A BE76 instructor reports the aircraft's right flap outer track partially detached and in an upward bent position caused flight control problems. An emergency was declared followed by a safe landing.

Narrative: I and my student were scheduled to fly in BE76 at XA00 from ZZZ Airport in order to carry out a range of flight maneuver. The student carried out the initial preflight on the airplane which he conducted in accordance with the checklist. He established during the walkaround that the airplane oil level indicated 6 quarts and that the fuel tanks contained 50 gallons each side. He stated to me that there was no water in the tank and that he had checked the landing gear. Then I carried out a secondary walkaround following the first. Then we got in the cockpit and did our checklist start of the right engine; then the left engine. Departure from ZZZ was perfectly normal and in accordance with local procedures for a southwest VFR departure. After our departure to the southwest; we leveled off at 2000 FT. I told my student to set the airplane up for performance slow flight in the takeoff configuration. This he did. I then told my student to fly heading of 360 degrees and he carried out the turn. Then I asked for slow flight in the landing configuration. As he reduced the power to 12 inches manifold pressure to reduce airspeed to 100 Knots; he put the gear down; then as airspeed reduced to 85 KTS he put flaps down -- at which point the outer half of the right flap detached from the airplane and was bent upwards. I took control of the aircraft and selected flaps back up but it now appeared they were stuck -- and the outer half of the right flap remained upward at 90 degrees to the normal position. By now the airplane was rolling and yawing to the right and losing altitude at about 200 Feet Per Minute at the same time. I had to reduce the left engine power to maintain a wings level attitude. I decided to recover to ZZZ Airport and contacted Tower. I informed them that my right flap had detached from the wing. Tower asked if I wanted to declare an emergency; I affirmed because I could not maintain altitude. Tower asked the number on board to which I replied '2' and told them that I still had around 80 gallons of fuel in the tanks. Tower offered me the runway of my choice and I opted for a straight-in approach on Runway XX. I landed safely without any further damage to aircraft or the runway environment.

Data retrieved from NASA's ASRS site as of May 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.