AD 2009-01-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | A318 | Airworthiness Directives; Airbus Model A318, A319, A320, and A321 Airplanes |
| aircraft | Aviat | Various | Airworthiness Directives; Airbus Model A318, A319, A320, and A321 Airplanes |
Unsafe Condition
Loss of AC BUS 1, AC ESS BUS, and DC ESS BUS can result in the loss of 5 upper Display Units and integral lighting, leading to flight crew difficulty in reading standby instruments when DOME lights are off.
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Required Actions
Modify the electrical supply logic by adding a back-up supply on the battery hot bus for the under glare shield flood lighting, as specified in Airbus Mandatory Service Bulletin A320-33-1057, Revision 01, dated January 31, 2008.
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Compliance Time
Within 42 months of the effective date (February 27, 2009).
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Affected Aircraft
Airbus Model A318, A319, A320, and A321 airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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