Cessna 402C N403BK

Summary

On 11 February 2005 at about 20:35 local time, a Cessna 402C registered N403BK, operated by Island Airlines, was involved in an incident near Hyannis, Massachusetts, United States. One person was 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

11 February 2005 at 20:35

Classification

Incident

Location

Hyannis, Massachusetts, United States

Nearest airport

Nantucket (ACK)

Coordinates

41.6708, -70.2803

Aircraft

Cessna 402C

Registration

N403BK

Category

Airplane

Engines

2

Operator

Island Airlines

Operating rule

Part 91: General Aviation

Purpose of flight

Positioning

Phase of flight

Not recorded

Route

Barnstable → Nantucket

Aircraft damage

Minor

Weather

VMC

Light

Day

NTSB number

NYC05IA052

Nobody was injured.

The mechanic's inadequate inspection, which failed to discover cracks in the left wing spar around wing station 114.

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

Read the full NTSB narrative

During a positioning flight, the pilot noticed the airplane required aileron trim to maintain level flight. The airplane landed without incident. Subsequent examination of the airplane revealed two rivets missing on the underside of the left wing, between the heat shield and a factory-installed doubler. The lower forward spar cap was cracked at wing station (WS) 114, at a rivet hole located just outboard of the outboard engine beam. The web doublers, both forward and aft, were split near the end of the inboard wing spar web at WS 112.5. The skin was cracked from the front spar lower cap up to the first stringer location behind the front spar. The airplane had been operated for about 20,510 total hours, and was required to have its forward, aft, and auxiliary wing spars inspected for cracks per FAA AD 2000-23-01, at intervals not to exceed 110 hours time-in-service. The cracked portion of the forward spar, skin and the aft web doubler were removed for further examination. The examinations revealed fatigue damage, that originated at the forward portion of the rivet hole on the spar cap at WS 114. Blackening and corrosion were observed on the fracture surface, consistent with the fracture being present at the time of the airplane's last inspection, which was conducted about a week earlier, and 12 operational hours prior to the incident.

Quoted verbatim from the NTSB record.