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Questions and Answers
What is the purpose of the HSCU (Horizontal Stabilizer Control Unit) in the aircraft?
What is the purpose of the HSCU (Horizontal Stabilizer Control Unit) in the aircraft?
The HSCU is part of the horizontal stabilizer system electronics and controls the horizontal stabilizer.
How many control channels does the HSCU have, and what is the architecture of each channel?
How many control channels does the HSCU have, and what is the architecture of each channel?
The HSCU has two mechanically and electrically separate control channels, each using a hardware and software dissimilar command/monitor architecture.
What is the purpose of the ARINC 429 transmit bus from HSCU channel 2?
What is the purpose of the ARINC 429 transmit bus from HSCU channel 2?
The ARINC 429 transmit bus from HSCU channel 2 provides the horizontal stabilizer position to the aircraft antenna control unit.
In normal operation, what sends rate commands to the HSCU, and what does the HSCU provide in return?
In normal operation, what sends rate commands to the HSCU, and what does the HSCU provide in return?
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What interface does the HSCU have with the CAS (Crew Alerting System) and CMC (Central Maintenance Computer)?
What interface does the HSCU have with the CAS (Crew Alerting System) and CMC (Central Maintenance Computer)?
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How does the HSCU receive trim commands if both FCCs fail?
How does the HSCU receive trim commands if both FCCs fail?
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What is the purpose of the cross-channel bus routed in a harness exterior to the HSCU?
What is the purpose of the cross-channel bus routed in a harness exterior to the HSCU?
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How is the HSCU electrically bonded to the aircraft structure?
How is the HSCU electrically bonded to the aircraft structure?
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What is the difference between HSCU channel 1 and channel 2?
What is the difference between HSCU channel 1 and channel 2?
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What type of connector is present at the rear of the HSCU?
What type of connector is present at the rear of the HSCU?
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Study Notes
Motor Drive Unit (MDU)
- The MDU is packaged as a single channel module integral to the HSCU, with one MDU per HSCU channel, dedicated to drive one motor brake.
- The MDU includes a lightning filter, internal power circuitry, Hall effect current sensors, speed and motor torque control electronics.
- The MDU is contained in a machined aluminum enclosure that is environmentally sealed and independent from the SCU.
- The MDU is cooled by convection and radiation from the cooling fins provided on both sides of the unit.
Circuit Breakers
- The system is protected by circuit breakers, including:
- STAB 2 DC REER A7
- REER E1 EMERG BUS 115VAC
- STAB 1 DC LEER B10
- PDB PDB / EER R MAIN BUS 115VAC
CAS Messages
- CAS messages for the system include:
- Stabilizer Rigging Complete (blue): rigging is valid for the current aircraft
- Stabilizer Maintenance Required (blue): the HSCU has flagged a maintenance item
Horizontal Stabilizer Control Unit (HSCU)
- The HSCU includes two major subassemblies: Signal Conversion Unit (SCU) and Motor Drive Unit (MDU)
- Each HSCU has a dual lane design, with each lane independently performing its own function in a command/monitor arrangement
- Motor commands are only provided from lane 1
- Each SCU generates commands, monitors motion, and provides high integrity horizontal stabilizer position data for its designated channel
- Each HSCU channel contains an MDU, capable of controlling one of two HSTA motors
Transformer/Rectifier Unit (TRU)
- The TRU converts three-phase, 115 Vac to 270 Vdc for powering HSTA motors
- The TRU uses a 12 pulse autotransformer, mediating choke, and filters to generate regulated 270 Vdc from the aircraft 115 Vac power source
- The secondary of the transformer is rectified by two diode bridges in parallel, providing 270 Vdc to the power bridge
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Description
Learn about the Motor Drive Unit (MDU) which is integrated as a single channel module within the HSCU system. Understand its components including lightning filter, internal power circuitry, current sensors, and control electronics. Explore the machined aluminum enclosure and cooling mechanisms of the MDU.
