B777 Back-up electrical system - TCAS
As I understand it if the power to one or both of the main AC busses is lost the backup electrical system automatically powers one or both transfer busses as required. To reduce electrical loading on the backup generator, the TCAS is not powered and is therefore inoperative.
Does shedding power to the TCAS have any impact on other Mode S transponder functions? (eg is ATC SSR impacted?) |
If you lost both main busses, I'd think the transponder would be the very least of your worries.
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Originally Posted by Amadis of Gaul
(Post 9493530)
If you lost both main busses, I'd think the transponder would be the very least of your worries.
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The Left ATC Transponder is on the Standby Bus. Surely that would be working (along with most of the essential inputs).
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Originally Posted by MickG0105
(Post 9495029)
If you're looking to ATC for a vector it's helpful if they can actually see you.
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Originally Posted by Amadis of Gaul
(Post 9495554)
Indeed. Still, I suspect it won't be problem #1.
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Originally Posted by NSEU
(Post 9495301)
The Left ATC Transponder is on the Standby Bus. Surely that would be working (along with most of the essential inputs).
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Originally Posted by MickG0105
Your suspicions and prioritisation of problems aside, can you help answer the question, Does shedding power to the TCAS have any impact on other Mode S transponder functions? (eg is ATC SSR impacted?) |
In flight if both transfer busses are unpowered the APU starts automatically regardless of APU switch position. 2 Backup generators (considered to be 1 generator) plus the APU generator will provide sufficient power to satisfy most electrical loads.
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Originally Posted by sleeve of wizard
(Post 9498078)
In flight if both transfer busses are unpowered the APU starts automatically regardless of APU switch position. 2 Backup generators (considered to be 1 generator) plus the APU generator will provide sufficient power to satisfy most electrical loads.
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