What you will study
Battery power and distribution
Locate the right-wing battery, battery relay, hot bus, A145 DC distribution panel and later GCUs immediately aft of A145. Follow current limiters and paired isolation diodes through the four dual-fed distribution loops, then connect actual master/relay state to the powered load.
Generation, regulation and load sharing
Separate generated voltage from line-contactor closure and load carried. Compare named generator-terminal and GCU sensing measurements before adjustment, then use the correct early-rheostat or later-GCU screw direction and repeat checks. Keep the original Leland load-sharing task separate from the later GCU regulated-voltage band of 28.00–28.50 V.
Battery health and external power
Calculate delivered ampere-hours and compare the separate endpoint-voltage requirement. Distinguish Ni-Cd charge-current indication, sealed lead-acid reserve testing, GPU indication, relay enabling and measured bus voltage.
Instrument AC and later DC supplies
Check the separate 115 V, frequency and 26 V inverter outputs in the retained-inverter profiles. Follow RR-18 No.1 to pilot PFD/AHC1 and No.2 to MFD/AHC2 in the identified later DC-avionics profile.
Learning outcomes
- Select among four confirmed installed electrical profiles using aircraft and equipment records.
- Trace battery, hot-bus and switched-distribution power without confusing a switch command with physical isolation.
- Distinguish failed generation, an open output connection and an indicated load discrepancy.
- Identify voltage-sensing drops before selecting a regulator adjustment.
- Choose the actual clockwise/increase or counterclockwise/decrease GCU direction and verify fresh measurements.
- Interpret dual-feed loop continuity and unintended connections between numbered loops.
- Calculate battery reserve and shunt-scale results while retaining their separate acceptance criteria.
- Compare each required inverter output and identify the later RR-18 DC-avionics relationships.
- Complete restoration and repeated measurements in an electrical maintenance training record.
Aircraft and course applicability
Training based on supplied King Air 200/B200 Maintenance Manual 101-590010-19 Chapter 24, whose effective-page list is dated November 1, 2024 with mixed task dates. Four identified BB-series study profiles distinguish original Leland BB70, later GCU/Ni-Cd BB1200, GCU/sealed lead-acid BB1750 and Pro Line 21 DC-avionics BB1900 installations. Select the actual aircraft serial, installed equipment and modification record before applying a task. B200GT/PT6A-52, Fusion and BL/BN/BT/BY configurations are outside these four assessed profiles. Aircraft work uses complete current applicable maintenance instructions.
WWAOG provides independent training. Online completion records knowledge and simulation achievement; it does not replace observed practical qualification, employer authorization or applicable licensing. Use current aircraft-effective maintenance instructions for physical work.
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