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AD/A320/211 - Stand-By Instruments - Emergency Lighting
Airbus Industrie A319, A320 and A321 SerAirbus Industrie A319, A320 and A321 Series Aeroplanes
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Airbus Industrie A319, A320 and A321 Series Aeroplanes
| AD/A320/211 | Stand-By Instruments - Emergency Lighting | 3/2008 |
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| Applicability: | A318, A319, A320 and A321 series aeroplanes, all serial numbers, fitted with classical standby instruments installed by Airbus modification 20011 or 21999 during production or by Airbus Service Bulletin (SB) A320-34-1280 whilst in service except: |
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| a. aircraft fitted with Integrated Standby Instrument System (ISIS) equipment installed by Airbus modification 27620 during production, or by Airbus SB A320-34-1261 or SB A320-34-1372 whilst in service, or | |
| b. aircraft having received Airbus modification 37329 or 37330 during production or by Airbus SB A320-33-1057 whilst in service. | |
| Requirement: | Unless already accomplished, modify the electrical supply logic of the under glare shield flood lighting in accordance with the instructions in SB A320-33-1057 or later EASA approved revision. |
| Note: EASA AD 2007-0286 refers. | |
| Compliance: | No later than 27 May 2011. |
| This Airworthiness Directive becomes effective on 13 March 2008. | |
| Background: | The European Aviation Safety Agency (EASA) has advised that some operators have reported occurrences of loss of the AC BUS 1 with subsequent loss of the AC ESS BUS and DC ESS BUS resulting in the loss of five upper Display Units and the loss of integral lighting. In this situation flight crew have reported concerns in reading the standby instruments when the DOME lights were selected to OFF.This situation, if not corrected, could increase the workload of the flight crew which constitutes an unsafe condition. |
| This Directive mandates the modification of the electrical supply logic by adding a back-up supply on the battery hot bus for the under glare shield flood lighting. |
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Charles Lenarcic
Delegate of the Civil Aviation Safety Authority
23 January 2008