Aviation safety issues and actions

Undetected horizontal stabiliser damage in world fleet

Issue number: AO-2014-032-SI-08
Who it affects: All operators of ATR 42 and ATR 72 aircraft
Issue owner: ATR
Operation affected: Aviation: Air transport
Background: Investigation Report AO-2014-032
Date: 24 May 2019

Safety issue description

As a legacy of there being no inspection specific to an in-flight pitch disconnect, there is potential for other ATR aircraft to have sustained an in-flight pitch disconnect in the past and be operating with undetected horizontal stabiliser damage.

Proactive Action

Action organisation: ATR
Action number: AO-2014-032-NSA-056
Date: 24 May 2019
Action status: Closed

In July 2016, ATR issued an All Operators Message (AOM: 42/72/2016/13 issue 1) to advise of stabiliser damage found during a scheduled maintenance check. Although the origin of this damage was not yet identified, ATR advised that it might be related to aircraft used beyond normal operation limitations (including but not limited to the combination of in-flight dual inputs, a pitch disconnect and large opposite elevator deflection at high speed).

ATR recommended in the AOM that operators perform a one-time inspection of the horizontal to vertical stabilizer junction as per the instructions in SB ATR42-55-0015 or ATR 72-55-1008 at the next convenient opportunity, no later than 6 months from release of the AOM.

Current issue status: Adequately addressed
Status justification:

The ATSB considers that the action taken by ATR addresses this safety issue.    

Last update 11 July 2019