Cessna 172 N3677S

Summary

On 28 July 2016 at about 23:30 local time, a Cessna 172 registered N3677S was involved in an accident near Rexburg, Idaho, United States. One person was on board and nobody was injured. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

28 July 2016 at 23:30

Classification

Accident

Location

Rexburg, Idaho, United States

Nearest airport

Rexburg-Madison County (RXE)

Coordinates

43.8339, -111.8050

Aircraft

Cessna 172

Registration

N3677S

Category

Airplane

Year built

1964

Engines

1

Operator

Not recorded

Operating rule

Part 91: General Aviation

Purpose of flight

Instructional

Phase of flight

Not recorded

Route

Rexburg → Rexburg

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

GAA16CA403

Nobody was injured.

The student pilot's failure to retract the flaps during a go-around in high density altitude conditions, resulting in the airplane's inability to climb and a subsequent collision with terrain and nose over.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

The student pilot reported that while practicing short-field landings on runway 17, a 4,200 foot asphalt runway, he overshot his intended landing area. He reported that about 65 knots indicated air speed and 25 feet above ground level (AGL), he executed a go-around by applying mixture rich, full throttle, carburetor heat cold, but the electric flaps were left fully extended. He reported that he pulled back on the yoke, but he could not get the airplane to climb, and the airplane descended to the right side of the runway, and touched down in the safety area to the right of the runway and nosed over. The airplane sustained substantial damage to both wings, vertical stabilizer and the rudder. The pilot reported that there were no mechanical malfunctions or anomalies with any portion of the airplane during the flight that would have prevented normal flight operations. Photographs of the accident airplane provided by the Federal Aviation Administration (FAA) showed the airplane inverted with the flaps extended. The airplane manufacturer pilot operating handbook prescribed Balked Landing procedure states: 1. Throttle – Full Open 2. Carburetor Heat – Cold 3. Wing Flaps - 20 Degrees (Immediately) 4. Climb Speed – 55 Knots 5. Wing Flaps 10 Degrees (Until obstacles are cleared) Retract (after reaching a safe altitude and 60 KIAS) The meteorological aerodrome report at accident airport about the time of the accident indicated: The temperature was 90 degrees Fahrenheit, dew point was 37 degrees Fahrenheit, the wind was out of 170 degrees true at 7 knots and varying between 140 degrees and 200 degrees true. The altimeter setting was 30.10. The field elevation at the airport was 4,858 feet and the density altitude was 7,850 feet. According to the FAA Pamphlet 8740-2 pertaining to Density Altitude: Whether due to high altitude, high temperature, or both, reduced air density (reported in terms of density altitude) adversely affects aerodynamic performance and decreases the engine's horsepower output. Takeoff distance, power available (in normally aspirated engines), and climb rate are all adversely affected. Landing distance is affected as well; although the indicated airspeed (IAS) remains the same, the true airspeed (TAS) increases. From the pilot's point of view, therefore, an increase in density altitude results in the following: • Increased takeoff distance. • Reduced rate of climb. • Increased TAS (but same IAS) on approach and landing. According to the aforementioned FAA Pamphlet, the Koch Chart (chart in docket) depicting the relationship between airport temperature (90 degrees) and airport pressure altitude (4,693 feet), the climb rate decreases by 64 percent. The pilot initiated the balked landing procedure at 25 feet AGL.

Quoted verbatim from the NTSB record.