Air Contractors – ATR72-202 (EI-SLG)

by | Apr 8, 2018 | Aviation Serious incident | 0 comments

Air Contractors ATR72 EI-SLG was on the first flight following a maintenance check and the aircraft experienced an uncommanded yaw resulting in a roll to the left as it accelerated through 185 kt.

Directional control was regained and subsequent cockpit indications identified a fault with the rudder Travel Limitation Unit (TLU). The aircraft returned to Edinburgh Airport, where it landed safely.

The investigation into this serious incident was conducted in conjunction with Air Contractors, Accident Investigation Unit (AAIU) of Ireland and the ‘Bureau d’Enquêtes et d’Analyses pour la sécurité de l’aviation civile’ (BEA) of France.

The investigation established that a cam on the rudder TLU mechanism of Air Contractors ATR EI-SLG had been removed and incorrectly refitted during the maintenance check.

As a result of this incident AAIB Special Bulletin S1/2011, containing three Safety Recommendations, was published on 15 April 2011. Since this incident the aircraft manufacturer and the engineering organisation have taken safety actions to minimise the possibility of a similar event recurring. Two further Safety Recommendations are made in this final report.

AIR CONTRACTORS flight EI-SLG

AIR CONTRACTORS flight EI-SLG

The incident was caused by the incorrect fitment of a cam on the rudder TLU mechanism which was not detected by maintenance personnel.

This resulted in rudder control restriction which caused the aircraft to enter an uncommanded roll to the left when the airspeed increased above 185 kt. The required independent inspection of the work and the operational test of the TLU system were not carried out.

Commercial pressure was identified as the most significant factor which influenced the decision to perform unapproved and unrecorded maintenance on the TLU system.

A contributory factor was the design of the TLU cams, which allowed them to be installed in the incorrect orientation.

 

Download Report

Air Contractors – ATR72-202 (EI-SLG)

Event date: 20110315
Airline / Operator:AIR CONTRACTORS
Model: ATR72-202
Make: ATR
Registration: EI-SLG
msn: 183
Location: Edinburgh,Scotland

You may like to review this event, with a similar cause:

Silkair – Airbus A319-133 (9V-SBH) flight SLK112

On 6 March 2012, an Airbus A319 aircraft registered 9V-SBH, was operating a Silkair flight SLK112 passenger flight. The aircraft departed from Changi Airport (WSSS), Singapore to Adi Soemarmo Airport (WARQ), Solo Indonesia. There were 131 persons on board, consisted...

0 Comments

Submit a Comment

Your email address will not be published. Required fields are marked *

Subscribe our Newsletter !!
our promise : we will keep email down to a minumum.

LET'S KEEP IN TOUCH !

THANK YOU !

Just make sure to check your inbox.
If you don't receive an email within 10 minutes, check also your spam folder.