Cessna U206G N506SD

Summary

On 21 March 1998 at about 23:52 local time, a Cessna U206G registered N506SD was involved in an accident near Grain Valley, Missouri, United States. 6 people were on board and 6 died. The aircraft was destroyed. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

21 March 1998 at 23:52

Classification

Accident

Location

Grain Valley, Missouri, United States

Nearest airport

Grain Valley Airport (3GV)

Coordinates

39.0006, -94.1997

Aircraft

Cessna U206G

Registration

N506SD

Category

Airplane

Engines

1

Operator

Not recorded

Operating rule

Part 91: General Aviation

Purpose of flight

Skydiving

Phase of flight

Not recorded

Route

Independence → Unknown

Aircraft damage

Destroyed

Weather

VMC

Light

Day

NTSB number

CHI98FA106

6 people died.

Pilot's inadequate preflight, the partial loss of oil and the resulting rod failure. A factor was the pilot's failure to maintain flying speed.

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

Read the full NTSB narrative

The parachute jump flight's airplane was at 3,700 feet MSL when the pilot cancelled the operation with the FAA approach controller without explanation. Witnesses observed the airplane trailing white and black smoke. One witness said he saw the airplane trailing black smoke with its engine making a banging sound. Three witnesses at the accident airport said the airplane had smoke and flames coming from the airplane's cowl and along the windshield as it approached the airport. They said the airplane banked right at a low altitude with its right wingtip striking the ground. The airplane caught fire during the collision sequence. The on-scene investigation revealed the engine, left side of the fuselage, bottom of left wing and its strut and the horizontal stabilizer and elevator were covered with oil film. The engine's oil filler tube was missing. The three filler tube mounting screws were not found at the accident site. Two of the 3 filler tube screw mounting holes had 2 of the screw threads next to the engine case's exterior surface pulled upward. The third screw hole threads were not pulled. The number 6 cylinder valve rocker arm cover had 5 of its 6 screws missing. The remaining screw was loose. The number 6 cylinder's bottom spark plug lead nut was disconnected. Its threads were not pulled. Examination of the engine revealed about 70 percent of the oil screen was covered by silver and bronze colored metallic debris. Holes were observed on the engine's left crankcase section near cylinders number 2 and 6. The engine's internal components suffered damage typical of oil loss and heat distress. The fracture face features on the engine's fractured left crankcase section were typical of overstress.

Quoted verbatim from the NTSB record.