Debris Examination Items 4 and 5
Debris Examination Items 4 and 5
Safety Investigation Report (2018) Appendix 1.12C
Summary
Item 4 - Engine Nose Cowl
Item No. 4 was found on 22 March 2016 in Mossel Bay, South Africa.
The item was brought to ATSB Laboratory in Canberra for detailed examination and analysis. The part was identified from the partial Rolls- Royce stencil as a segment from an aircraft engine cowling. The panel thickness, materials and construction conformed to the applicable drawings for Boeing 777 engine cowlings. There were no identifiers on the engine cowling segment that were unique to 9M-MRO, however the Rolls-Royce stencil font and detail did not match the original from manufacture. The stencil was consistent with that developed and used by MAS and closely matched exemplar stencils on other MAS B777 aircraft. There were no significant differentiators on the cowling segment to assist in determining whether the item of debris was from the left or right side of the aircraft, or the inboard or outboard side of the cowling. It was concluded that the item is almost certain from MAS B777 aircraft, registered 9M-MRO.
Item 5 - Door R1 Stowage Closet
Item No. 5 was found on 30 March 2016 in Rodrigues Island of Mauritius.
The item was brought to ATSB Laboratory in Canberra for detailed examination and analysis. The part was identified by the decorative laminate as an interior panel from the main cabin. The location of a piano hinge on the part surface was consistent with a work-table support leg, utilised on the exterior of the MAS Door R1 (forward, right hand) closet panel. The part materials, dimensions, construction and fasteners were all consistent with the drawing for the panel assembly and matched that installed on other MAS Boeing 777 aircraft at the Door R1 location.
There were no identifiers on the panel segment that were unique to 9M- MRO, however the pattern, colour and texture of the laminate was only specified by MAS for use on Boeing 747 and 777 aircraft. There is no record of the laminate being used by any other Boeing 777 customers.
It was concluded that the item is almost certain from MAS B777 aircraft, registered 9M-MRO.
Source: Safety Investigation Report 2018:1 Factual Information/1.12/1.12.3 SIR-2018
Source: Safety Investigation Report 2018 Appendix 1.12C SIR-APP-SET4