948F458-5

PANEL GCU
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About this product
The 948F458-5 GCU Panel is a refurbished generator control unit designed to manage the electrical output of aircraft starter-generators. It actively regulates voltage, monitors load sharing between multiple generators, and provides critical protective functions, such as over-excitation, reverse-current, and differential-voltage protection, to protect the aircraft’s DC power system during all phases of flight.
948F458-5 Datasheet
UOM: EA
Stock Location: Dubai
Hazardous Item: Non-Hazardous Item
Life Limited Part: No
Lead Time: Stock
Certification: Dual Release
8130/EASA Eligible: Yes
PRODUCT DESCRIPTION

948F458-5

  • Overexcitation Protection: Detects and limits excessive field current to prevent generator overheating and potential damage when paralleling or during heavy load conditions.

  • Reverse-Current Sensing: Instantly isolates the generator if it begins to draw power (acting as a motor) to prevent battery discharge and cross-feed into a failed unit.

  • Differential Voltage Paralleling: Ensures voltage outputs of multiple generators are closely matched before connecting to the bus, avoiding circulating currents and uneven load sharing.

  • Integrated Fault Monitoring: Continuously self-tests internal circuits and monitors parameters, such as over/under-voltage and over-current, providing pilot warnings and automatic disconnects upon fault detection.

  • Paralleling multiple starter-generators to share electrical loads evenly.

  • Providing emergency isolation of a failed generator to maintain power to critical systems.

  • Integrating with auxiliary power units (APUs) to manage backup electrical supply.

  • Serving as a direct replacement in maintenance, repair, and overhaul (MRO) operations for worn or faulty GUCs.


  • What is the primary function of the 948F458-5 GCU?

It regulates generator field current to maintain stable voltage output and protects the electrical system through fault sensing and isolation.

  • What does the “RP” condition mean?

“Repairable” indicates the unit has been inspected, repaired, and tested against OEM standards to restore full functionality.

  • How does reverse-current protection work?

A built-in sensor detects current flow back into the generator; if reverse flow occurs, the GCU circuitry quickly disconnects the generator to prevent battery drain.


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