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17 Cards in this Set
- Front
- Back
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AC power sources |
2 engine driven IDGs - 3 phase, 115V - supplies associated bus - when 1 gen inop, can supply essential and non-essential loads to opposite side bus
APU gen - can pwr both transfer buses (ground or flight)
External power *different sources cannot be paralleled *connecting a different source auto disconnects existing pwr source |
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Buses on ea system |
- transfer bus - main bus - 2 galley buses - ground service bus *AC standby bus receives pwr from Transfer bus 1 |
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Source failure/disconnect |
- bus tie breakers allow transfer bus to be pwrd by other available source - both transfer buses can be supplied with pwr from 1 engine gen or from APU -if 1 gen fails, system auto sheds loads in increments to bring total load w/in capacity 1) galleys and main bus on Transfer bus 2 2) galleys and main bus on transfer bus 1 |
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DC pwr supply |
- 3 TRUs supply 28V DC - receive pwr from AC transfer buses - total DC load can be suppl by any 2 TRUs - DC bus 1 & 2 and DC standby bus - battery - 24V NiCad |
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ILS redundancy |
Cross bus relay opens at GS capture (FD or AP ops), prevents single bus failure from affecting both nav receivers and FCCs |
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Standby power |
- 24V DC battery - if no other source (engine/APU) avail - pwrs essential systems - pwr to: - DC standby bus - AC standby bus (through static inverter) - battery bus - hot battery bus - switched battery bus - can provide standby pwr up to 60mins |
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DRIVE (overhead) |
- Gen disconnected through gen drive disconnect switch - IDG failure - Engine shutdown - IDG auto disconnect due high oil temp |
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STANDBY PWR OFF (overhead) |
- AC standby bus unpwrd - DC standby bus unpwrd - Battery bus unpwrd |
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GRD POWER available |
- illum when pwr is connected and of sufficient quality - ON removes other pwr sources from buses & pwrs AC transfer buses |
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BUS TRANS switch |
AUTO - permits bus tie breakers to operate to maintain pwr to AC transfer buses from any operating source OFF - isolates AC transfer buses 1 & 2 - DC cross tie relay open to isolate DC buses |
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TRANSFER BUS OFF (overhead) |
Associated transfer bus not pwrd |
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SOURCE OFF (overhead) |
No source has been manually selected to pwr associated transfer bus |
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GEN OFF BUS (overhead) |
IDG not supplying pwr to related transfer bus |
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APU GEN OFF BUS (overhead) |
APU gen is available but not supplying pwr to a bus |
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GEN switches |
ON - removes other pwr source from AC transfer bus, closes gen CB OFF - disconnects IDG from related transfer bus by opening CB |
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When selecting GRD PWR ON |
Extinguishes: SOURCE OFF TRANSFER BUS OFF STANDBY PWR OFF |
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APU start |
- APU switch to Start (hold 1 sec) - ACT fuel pumps ON - APU GEN OFF BUS light illum - Both APU GEN BUS switches ON - Extinguishes SOURCE OFF, TRANSFER BUS OFF, STANDBY PWR OFF |
