Incident Overview

Date: Sunday 3 November 2013
Aircraft Type: Pilatus Britten-Norman BN-2B-21 Islander
Owner/operator: Channel Islands Air Search – CIAS
Registration Number: G-CIAS
Location: Devil’s Hole, Saint Mary, Jersey – ÿ United Kingdom
Phase of Flight: En route
Status: Substantial, written off
Casualties: Fatalities: 0 / Occupants: 5
Component Affected: The aircraft’s engine, particularly the left engine, and the fuel system, specifically the tip tanks. The selection of the tip tanks on a previous flight significantly impacted the aircraft’s performance and landing conditions.The aircraft’s engine, particularly the left engine, and the fuel system, specifically the tip tanks. The selection of the tip tanks on a previous flight significantly impacted the aircraft’s performance and landing conditions.
Investigating Agency: AAIBAAIB
Category: Accident
On November 3, 2013, a Channel Islands Air Search aircraft encountered difficulties near Les cr‚hous, Jersey, resulting in a forced landing. The pilot initiated a MAYDAY call, and the search director followed suit. The aircraft experienced a rapid and unstable engine performance, culminating in a sudden descent and a hard landing on a rocky cliff face. The pilot and search crew were unharmed. The aircraft’s fuel levels were low, and a critical error in tip tank selection ? a previously selected flight ? led to the landing.On November 3, 2013, a Channel Islands Air Search aircraft encountered difficulties near Les cr‚hous, Jersey, resulting in a forced landing. The pilot initiated a MAYDAY call, and the search director followed suit. The aircraft experienced a rapid and unstable engine performance, culminating in a sudden descent and a hard landing on a rocky cliff face. The pilot and search crew were unharmed. The aircraft’s fuel levels were low, and a critical error in tip tank selection ? a previously selected flight ? led to the landing.

Description

At approximately 18:20 hrs on 3 November 2013, the Channel Islands Air Search organisation was alerted to carry out a search for two fishermen who were in difficulties near Les cr‚hous, a group of rocks north-east of Jersey, Channel Islands. The pilot, accompanied by the search director, and three observers, gathered at the aircraft’s base at Guernsey Airport, and made preparations for flight. There was no moon and the Channel Islands were affected by poor weather, with strong southerly winds, low cloud, and poor visibility. The aircraft took off at 18:47 hrs and, taking account of the cloud base and visibility, the pilot levelled the aircraft at approximately 700 ft amsl on track towards the search area. When the aircraft was approximately six miles north of Jersey Airport, the right engine rpm began to vary, repeatedly reducing and then increasing. The observer seated to the right of the pilot, observed the fuel pressure fluctuating but this was not noticed by the pilot. The pilot selected the alternate intake air but the engine then stopped. The pilot feathered the propeller and then completed the engine shutdown checks. Following a brief conversation with the search director, the pilot turned the aircraft towards Jersey Airport and declared a MAYDAY to ATC, while the search director made a similar call on the maritime frequency. The pilot applied full power on the left engine and put the aircraft into a climb. The aircraft had climbed to approximately 1,100 ft amsl when the left engine rpm began to fluctuate before the engine ceased to produce power. The pilot informed ATC that the aircraft was “going down” and the search crew stowed their equipment. No attempt was made to re-start either engine. An offshore lifeboat operating nearby changed its course to be in attendance should the aircraft ditch. As the aircraft descended, the radio altimeter issued an alert prompting the pilot to switch on the landing lights and instruct the crew to brace. As it continued its descent the aircraft’s landing lights suddenly illuminated ground ahead and the pilot manoeuvred for a touchdown. The north coast of Jersey is characterised by rocky cliffs and roughly undulating terrain, however, the aircraft’s descent brought it towards one of the very few relatively benign areas suitable for a forced landing. Following a ground roll of 140 m, during which the left main landing gear collapsed rearwards, the aircraft’s progress was halted when its nose lodged, in a gentle impact, in the base of a tree. The pilot and search crew were uninjured. After making the aircraft safe they made their way to nearby habitation, where they were met by emergency services personnel who had been dispatched to search for them. Initial examination of the aircraft revealed that both main fuel tanks were found almost full and the tip tanks were empty. Switches in the cockpit were found in the ‘tip tank’ position. It appears that the tip tanks had been selected on a flight the previous day and the selection had not been changed. At the commencement of the accident flight, each tip tank contained approximately 5-6 USG.

Source of Information

http://www.channelonline.tv/channelonline/DisplayArticle.asp?ID=507984http://www.channelonline.tv/channelonline/DisplayArticle.asp?ID=507984

Primary Cause

Incorrect tip tank selection during flight operations, resulting in a loss of fuel and engine control.Incorrect tip tank selection during flight operations, resulting in a loss of fuel and engine control.

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