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Qantas 32

Printed page label not indexed. PDF page 16.

submitted through the manufacturer's non-conformance management system. There was a level of uncertainty inherent within the statistical analysis method used in that assessment. The uncertainty was not effectively communicated to, or understood by, the engineers that assessed t
Open official document at PDF page 16ATSB AO-2010-089: In-flight uncontained engine failure, Airbus A380-842 VH-OQA, overhead Batam Island, 4 November 2010

Qantas 32

Printed page 115. PDF page 135.

the components. Along with the measurement uncertainties, an estimate of the level of uncertainty has been included in the range of the measured true positions provided. - 115 -
Open official document at PDF page 135ATSB AO-2010-089: In-flight uncontained engine failure, Airbus A380-842 VH-OQA, overhead Batam Island, 4 November 2010

Qantas 32

Printed page 116. PDF page 136.

error was estimated to have been in the range from ∅0.40 to ∅0.48mm. Due to the greater uncertainty in the measurement of the true position of the fine limit counter bore; there is uncertainty as to whether the CMM would
Open official document at PDF page 136ATSB AO-2010-089: In-flight uncontained engine failure, Airbus A380-842 VH-OQA, overhead Batam Island, 4 November 2010

Qantas 32

Printed page 124. PDF page 144.

manufacturing engineer attempted to convey a qualitative assessment of the level of uncertainty within the analysis by including the abbreviation ‘est' preceding ‘worse case'. The engineer reported to the ATSB that ‘est' was included to indicate the listed non-conforma
Open official document at PDF page 144ATSB AO-2010-089: In-flight uncontained engine failure, Airbus A380-842 VH-OQA, overhead Batam Island, 4 November 2010

Qantas 32

Printed page 137. PDF page 157.

the in-service fleet. The manufacturing engineer's attempt to convey their level of uncertainty to the non conformance authority was not effective. The language used on the concession form to define the non-conformance likely gave the non conformance authority and the
Open official document at PDF page 157ATSB AO-2010-089: In-flight uncontained engine failure, Airbus A380-842 VH-OQA, overhead Batam Island, 4 November 2010

Qantas 32

Printed page 143. PDF page 163.

misalignments in engines already released into service, nor did it implicitly provide a level of uncertainty in the results. - 143 -
Open official document at PDF page 163ATSB AO-2010-089: In-flight uncontained engine failure, Airbus A380-842 VH-OQA, overhead Batam Island, 4 November 2010