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In-flight landing distance safety margin may be inadequate

Issue number: AO-2015-046-SI-05
Who it affects: Civil Aviation Safety Authority
Issue owner: Civil Aviation Safety Authority
Operation affected: Aviation: Air transport
Background: Investigation Report AO-2015-046
Date: 18 September 2018

Safety issue description

Civil Aviation Order 20.7.1B stipulated that a 1.15 (15 per cent) safety margin was to be applied to the actual landing distance for jet-engine aircraft with a maximum take-off weight greater than 5,700 kg. This safety margin may be inadequate under certain runway conditions, which increases the risk of a runway excursion. The corresponding guidance in Civil Aviation Advisory Publication 235-5(0) had not been updated to account for this.

Proactive Action

Action organisation: Australian Civil Aviation Safety Authority
Action number: AO-2015-046-NSA-011
Date: 18 September 2018
Action status: Monitor

In response to this safety issue, the Civil Aviation Safety Authority advised that the advisory guidance material, Civil Aviation Advisory Publication 235-5(0) - New performance provisions for Civil Aviation Order 20.7.1B and Civil Aviation Order 20.7.4 was published to accompany the May 2014 amendment to Civil Aviation Order 20.7.1B. The subsequent August 2015 United States Federal Aviation Administration advisory safety alert (15009), which warns aircraft operators and pilots that the advisory data for wet runway landings may not provide a safe stopping margin under certain conditions will be evaluated for incorporation into the advisory material contained in Civil Aviation Advisory Publication 235-5(0), with an aim to incorporate any changes prior to the end of March 2019.

   
Current issue status: Safety action pending
Status justification:

The ATSB notes the Civil Aviation Safety Authority’s intention of incorporating additional safety information regarding the in-flight safety margin into Civil Aviation Advisory Publication 235-5(0). The ATSB will monitor the Civil Aviation Safety Authority’s progress and assess the safety issue on completion of amendments made to this publication.

 
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Last update 18 September 2018