Skyhawk 172/Cutlass 172
Flight Crew Commercial; Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Flight Instructor
Flight Crew Last 90 Days 30; Flight Crew Total 2670; Flight Crew Type 1200
Communication Breakdown
Inflight Event / Encounter Loss Of Aircraft Control
Flight Crew Regained Aircraft Control
Airport; Human Factors
PDK has parallel runways 390 feet apart. A jet was awaiting takeoff clearance between the runways. We were cleared to land on runway 3L. The student was flying; we were on short final when the jet was cleared for takeoff on 3R. When we passed behind the jet we were about 20 feet AGL and the plane was blown sideways to the edge of the runway and instantly banked 60 degrees left. I took over the controls and landed the aircraft.This situation occurs frequently at PDK; when it does I instruct the student to land long to avoid the jet blast. This time I was occupied correcting the student's crosswind technique and failed to notice the jet waiting to takeoff.The Tower is good at reminding pilots of wake turbulence. A reminder of possible jet blast could have made a difference.
C172 instructor pilot reported his aircraft was upset at low altitude on approach to PDK when encountering jet blast from an aircraft awaiting takeoff clearance.