IFR Weather Quiz SC

Looks like the high density altitude at SKX got the best of you.  Try to pass this quiz with a 90% or better…

The private pilot and three passengers departed in the airplane from a 3,000-ft-long runway with a density altitude of about 3,000 ft and a light wind. Surveillance video showed that the airplane did not use the entire length of the runway for takeoff; the pilot began his takeoff roll where the paved section of the part turf/part asphalt runway began, resulting in 2,400 ft of available runway. During the ground roll, the nose of the airplane lifted off and then settled back onto the runway, and the airplane became airborne at 1,500 ft. Witnesses described the takeoff and initial climb as “slow” and “sluggish.” The wings rocked, and the airplane climbed to about 100 ft in a continuous left turn before descending into trees 1,000 ft left of the runway centerline.

Examination of the airplane and its engine revealed no evidence of preimpact mechanical malfunction or anomaly. An estimate of the airplane’s takeoff weight indicated that it was about 66 lbs over the maximum allowable takeoff weight of 2,750 pounds. Review of performance charts revealed that the takeoff ground roll distance for the airplane at the maximum allowable gross weight was about 2,180 ft. Review of radar data showed that from rotation to the final radar target, the airplane’s groundspeed (which was about the same as its airspeed given the light wind) varied between 61 and 67 knots, which was about the airplane’s calculated stall speed of 60 knots. Further, the witness observations were consistent with the pilot failing to attain sufficient airspeed, which resulted in the airplane’s wing exceeding its critical angle of attack and an aerodynamic stall.

It is likely that the pilot lifted off prematurely at a speed lower than normal and was unable to accelerate or climb the airplane once it exited ground effect. A premature liftoff and a climb attempt at a speed significantly below best angle of climb speed (78 knots) placed the airplane in a situation where the power required for level flight was very near or exceeded the available power. To recover from this situation the pilot needed to lower the airplane’s nose in order to accelerate the airplane to obtain a positive rate of climb. However, such an action is counterintuitive when low to the ground and requires accurate problem recognition, knowledge of the correct solution, and sufficient terrain clearance to accomplish.

Good Job!  You’ve made it safely on the ground into SKX!