While Having a Discussion, Technician a Says That Launch Shudder

Multiple Choice

While having a discussion, Technician A says that launch shudder occurs on acceleration from a standing start and continues until about 25 mph before it disappears. Technician B says that first order vibration occurs on acceleration from a standing start to about 25 mph before disappearing. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B