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SB28: Accomplishment Instructions.
Stratus Double Burner; Mounting Hanger Inspection.
CBL/TN/DCB/3191 Issue: B 04/02/2020 D C Boxall
CBL/TN/DCB/3191 Issue B 04/02/2020
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1 BACKGROUND
1.1.1 A Stratus Burner hanger CB8504 has failed in service after landing. The burner hanger failed, leaving one burner unit detached from the load frame. The burner was supplied in April 1999 and its history is unknown.
1.1.2 Investigation of the Cameron Balloons Problem Report System revealed a small number of similar failures; SB28 is issued as a result.
1.1.3 This document provides the accomplishment instructions for SB28.
1.1.4 Throughout this document all Maintenance Manual references are to Issue 10 Amendment 4 or higher.
1.1.5 The design of the welded hanger assembly was fundamentally revised at Issue D (2009). Only Issue A, B & C components are affected.
Fig 1. Double Stratus Burner Unit Fig 2. Close-up of weld failure.
Note failed hanger on the right.
2 IDENTIFICATION OF AFFECTED HANGERS.
2.1.1 The affected hangers were fitted to double burners with serial numbers 320 or lower. The burner serial number is hand engraved onto one of the hanger end plates. Should the burner serial number be unreadable or missing Cameron Balloons can identify the burner from the manifold block serial numbers (machine engraved onto the upper surface of the burner manifold block).
CBL/TN/DCB/3191 Issue B 04/02/2020
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Fig 3. Burner Serial Number (296) & Part Number (CB8720) engraved on the hanger
2.1.2 Affected hangers (Issues A through C) have either no machine engraving or have “Cameron Balloons Limited” machine engraved in the upper right-hand corner of the end plate. Non-affected hangers (Issue D and E) have the text “Cameron Balloons Limited” machine engraved in the lower right-hand corner of the end plate.
Fig 4. View of Hanger Assembly. Fig 5. Position of Machine Engraving.
CBL/TN/DCB/3191 Issue B 04/02/2020
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3 INSPECTION.
Fig 6. View of the affected weld. Note burner coil removed for clarity.
3.1.1 The weld in the end of the hanger can be seen through the holes in the can. A torch and a mirror may be requred to give a clear view.
3.1.2 Remove any soot or dirt prior to inspection. WD40 or kerosene (paraffin) is the preferred cleaner; some solvent cleaners may damage the finish of the can.
3.1.3 Inspect the weld for any signs of cracking. Attempting to move the burner relative to the hanger may assist in making the crack visible.
3.1.4 If a clear view cannot be obtained or there is any doubt then the hanger must be removed from the burner. The burner is mounted to the hanger with M5 fasteners CY-0005-1004, CY-0005-1016, and CY-0005-2009. A single M3 screw secures each burner manifold block to the tubular handle.
3.1.5 Cracked hangers must be replaced before further flight with a new part CB-8504-0000 Issue D or later. Cracked hangers must not be re-welded.
4 DOCUMENTATION
4.1.1 Record the inspection in the aircraft log book.
4.1.2 Report any cracked hangers to technical@cameronballoons.co.uk including the serial number of the burner (engraved on the hanger end-plate) or the serial numbers of the manifold blocks.
CBL/TN/DCB/3191 Issue B 04/02/2020
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