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AD/BAe 146/121 - Lift Spoiler Actuator Life Limits
British Aerospace BAe 146 Series AeroplaBritish Aerospace BAe 146 Series Aeroplanes
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British Aerospace BAe 146 Series Aeroplanes
| AD/BAe 146/121 | Lift Spoiler Actuator Life Limits | 8/2006 |
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| Applicability: | BAe 146 and AVRO 146-RJ aeroplanes. |
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| Requirement: | 1. Determine the life of each lift spoiler actuator/jack, part number P308-45-0002, P308-45-0102 or P308-45-0202, in accordance with Paragraph 1.D of Service Bulletin 27-178 Revision 0 or later approved revision.2. Replace each lift spoiler actuator/jack part number P308-45-0002, P308-45-0102 or P308-45-0202, in accordance with Paragraph 2.A of Service Bulletin 27-178 Revision 0 or later approved revision.Note: EASA AD 2006-0138 dated 23 May 2006 refers. |
| Compliance: | 1. Within 30 days after the effective date of this AD.2. Prior to the part accumulating 55,000 flight cycles or before 1 September 2007, whichever occurs later after the effective date of this AD. |
| This Airworthiness Directive becomes effective on 3 August 2006. | |
| Background: | The life limitation relating to the P308-45 series of lift spoiler jacks was originally qualified to 55000 flight cycles and there is no new data to support an increase to this figure.The aircraft life is currently defined in Chapter 5 of the aircraft Maintenance Manual as 40,000, 43,000 or 50,000 cycles depending on variant. The life limit of the lift spoiler jack is not defined as this is in excess of the stated aircraft life.The lift spoiler jack life limitation has been reviewed as part of the BAe 146 and AVRO RJ aircraft (systems) Life Extension Programme. The lift spoiler actuator is highly loaded at high flap angles with the aircraft operating near to the maximum permitted speed for that flap angle. The most likely flight phase for this failure to occur is therefore approach or take-off. The low altitude of these flight phases provides less time in which to safely control the increased roll rate. Therefore the unit life must remain at 55,000 cycles. |
| A number of aircraft are approaching the applicable life limitation. Also, where accurate records are not available for individual units, the calculated theoretical life may exceed 55,000 cycles. This has been determined as acceptable for the limited period defined within the AD compliance requirement. |
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