L2012-08/S2 Include in the ATR FCOM change of TLU STBY from HI SPD mode to the LO SPD mode

Investigation branch:

Aviation L

Recommendation ID:

L2012-08/S2

Issue date:

30.10.2013

End implementer of the recommendation:

ATR Aircraft

Implementation status:

Implemented

Investigation:

L2012-08 Airliner Veering Off the Runway during the Landing Roll at Helsinki-Vantaa Airport on 19 August 2012

Type of accident:

Air Transport

Justification of the recommendation

As regards a TLU fault the FCOM states the following: “DISREGARD TLU FAULT ALERT”. This can only be done when the green TLU light turns on after the manual switch has been set to the LO SPD mode. When manually controlling the TLU it takes 33 ± 5 seconds for the mode to change and the indicator light to turn on.

Recommendation

Safety Investigation Authority, Finland recommends that the manufacturer of the ATR aircraft include in the FCOM the length of time it takes for the TLU’s standby system to change from the HI SPD mode to the LO SPD mode.

Specification of recommendation

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Reiterated in investigation: ---

Actions / explanations

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Updated 4.10.2019