Airworthiness Directives (ADs)
CAA-2005-08-021
The aircraft owner or operator shall comply with Airworthiness Directives issued by the CAA or the aeronautics authority of the State of Design (SoD) of the aviation products, appliances and parts, and take all necessary actions thereto.
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Issue Date
- 2005/08/30
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Applicability
- Honeywell RCZ-83() and RCZ-85() Communication Units
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Model Number
- QE
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CAA AD Number
- CAA-2005-08-021
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Aeronautics Authority of Original AD
- EASA
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Original AD Number
- 2005-0021
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Effective Date
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Subject
- A design deficiency causes the transponder to revert to standby mode if a change of the 4096 ATC code (also referred to as the Mode A code) is not completed within 5 seconds. As a consequence, the SSR radar symbol and label associated with the aircraft’s position will no longer be shown on the ATC ground radar display. Also, aircraft collision avoidance systems (ACAS) on board own and other aircraft will be comprimised. Current operational procedures, typically, do not require the crew to recheck the transponder status after changing the
4096 ATC Code. This type of failure will increase ATC workload and will result in improper functioning of ACAS.
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Reference Publications (Revision/ATA/SB)
- Honeywell Technical Newsletter A23-1146-004, Honeywell Service Bulletin A21-3851-005 and Honeywell Service Bulletin A24-3851-002.
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Remarks
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