If Extend and Retract Wing Flaps is chosen as a flight option then it will require an independent maneuver. If flaps are small in size and difficult to observe in a lowered position, the judges may request that they be lowered in a taxi maneuver prior to takeoff, or that they remain lowered in a taxi maneuver after landing. For maximum points, the flap action should resemble the prototype, i.e., split flap, fowler flaps, etc. During the fly-pass the wing flaps are extended and at least one lap completed before wing flaps are retracted. The model should reduce speed before wing flaps are extended and the model should increase speed before the wing flaps are retracted.
Faults
- Beginning and ending of scale operation were not called.
- Not commenced from above High Normal Flight Level.
- Extension and/or retraction not in full view of the judges.
- Model speed too high for flap lowering.
- Model not flown at Low Normal Flight Level for a minimum of one lap with flaps extended.
- Speed and/or sequence of extension and retraction not realistic.
- No change in model altitude with flaps lowered.
- Maneuver not finished above High Normal Flight Level.
- Failure to operate flaps when required.
- Flap operation is grossly different from aircraft.
- Model does not exhibit realistic trim change during flap operation.