Cessna 182S N661SP

Summary

On 10 December 2014 at about 20:40 local time, a Cessna 182S registered N661SP, operated by Illinois State Police, was involved in an incident near Springfield, Illinois, United States. 2 people were on board and nobody was injured. The aircraft was slightly damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

10 December 2014 at 20:40

Classification

Incident

Location

Springfield, Illinois, United States

Coordinates

39.8444, -89.6778

Aircraft

Cessna 182S

Registration

N661SP

Category

Airplane

Year built

2000

Engines

1

Operator

Illinois State Police

Operating rule

Public Use

Phase of flight

Not recorded

Route

Springfield → Springfield

Aircraft damage

Minor

Weather

VMC

Light

Day

NTSB number

CEN15IA076

Nobody was injured.

The improper installation of a doubler patch, which prevented the right flap from actuating and moving properly and led to the subsequent interference with the aileron.

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

Read the full NTSB narrative

During a proficiency flight for one of the pilots, he was demonstrating a slow-flight recovery procedure, and he added power and began retracting the flaps. When the flaps passed through 10 degrees toward fully retracted, the pilot felt an uncommanded right yoke control movement. As the pilot applied more pressure to the control yoke to maintain level flight, both pilots heard a loud pop, and the uncommanded right yoke control movement stopped. The pilots assessed the airplane and noted that the right flap was buckled. They then conducted a precautionary landing without incident. A postaccident examination of the airplane found that the inboard portion of the right flap had become dislodged from its track and that the flap had shifted outboard and contacted the aileron. Further examination of the flap system found that a doubler patch had been improperly installed on the lower trailing edge skin; the improper installation altered the curvature of the lower trailing edge skin and infringed on the normal actuation of the flap rollers. Both the inboard and outboard brackets surrounding the flap track had fractured due to the repeated stress applied during the flap roller actuation. A review of the public agency's fleet of airplanes found similar curvature of the lower trailing edge skin and bracket damage due to the improper installation of doubler patches.

Quoted verbatim from the NTSB record.