DONE 4P Emergencies - Wing Flaps (Asymmetrical Position)

Question 0

• AIRPLANE ONLY*

1. What is an “asymmetrical” flap emergency? (FAA-H-8083-3)

Answer 0

An asymmetric “split” flap situation is one in which one flap deploys or retracts while the other remains in position. The problem is indicated by a pronounced roll toward the wing with the least flap deflection when wing flaps are extended or retracted.

Question 1

• AIRPLANE ONLY*

2. What procedure should be followed in an asymmetrical flap emergency? (FAA-H-8083-3)

Answer 1

The roll encountered in a split flap situation is countered with opposite aileron. The yaw caused by the additional drag created by the extended flap will require substantial opposite rudder, resulting in a cross-control condition. Almost full aileron may be required to maintain a wings-level attitude, especially at the reduced airspeed necessary for approach and landing. The approach to landing with a split flap condition should be flown at a higher than normal airspeed. The pilot should not risk an asymmetric stall and subsequent loss of control by flaring excessively. The airplane should be flown onto the runway so that the touchdown occurs at an airspeed consistent with a safe margin above flaps-up stall speed.