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AD/BAe 146/124 - Three-Phase Circuit Breakers
British Aerospace BAe 146 Series AeroplaBritish Aerospace BAe 146 Series Aeroplanes
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British Aerospace BAe 146 Series Aeroplanes
| AD/BAe 146/124 | Three-Phase Circuit Breakers | 8/2006 |
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| Applicability: | All BAe 146 series aeroplanes. |
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| Requirement: | 1. If not previously accomplished, inspect and test all three-phase circuit breakers, terminal leads, wire looming and circuit breaker panels in accordance with Paragraph 2.C. of BAe Systems (Operations) Ltd Inspection Service Bulletin24-141 Revision 0 dated 15 August 2005 or later revision approved by the European Aviation Safety Agency (EASA). |
| 2. Rectify any damage found and replace unserviceable units detected during the Requirement 1 inspection and test. | |
| Inspections and tests completed in accordance with National Jet Systems Technical Service Instruction Number TSI-146-24-007 Issue 1 dated 9 December 2003 are considered acceptable for inspections and tests required by this Directive. | |
| Note: EASA AD 2006-0132 refers. | |
| Compliance: | For Requirement 1 - Within 12 months after the effective date of this Directive. |
| For Requirement 2 - Before further flight after the Requirement 1 inspection and test. | |
| This Airworthiness Directive becomes effective on 3 August 2006. | |
| Background: | Investigation into the cause of overheating of three-phase circuit breakers, used at various locations throughout the aircraft (but predominantly in the under floor electrical bay and the flight deck), has identified a possible age related deterioration of the units. Failure of a circuit breaker will result in the generation of smoke or flames, and prevent the electrical load from being isolated from its electrical supply. |
| This Directive requires the inspection of all three-phase circuit breakers and wiring for cracking, discoloration, corrosion, security or burning and, if necessary, the rectification of any damage found together with the replacement of any defective circuit breakers. |
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James Coyne
Delegate of the Civil Aviation Safety Authority