The 587-829 is a Piper OEM rocker-type electrical switch assembly used for split battery and alternator (BAT/ALT) control functions in aircraft electrical systems. It is also cross-referenced as PAC 99377-05, indicating an approved alternate or supplier reference for the same functional component.

This switch is installed in the aircraft cockpit electrical panel and allows the pilot to control and isolate key electrical power sources, typically including the battery and alternator systems. Depending on aircraft configuration, it may be used for power distribution management, system isolation, or electrical fault handling during normal and emergency operations.

The rocker design provides clear tactile feedback and reliable operation under vibration, while internal contacts are engineered for consistent electrical performance in aviation environments. The switch is designed to withstand repeated cycling, temperature variation, and cockpit operational stress.

Manufactured to aviation-grade electrical standards, the housing is typically made from durable thermoplastic or metal-reinforced material, with internal silver-alloy or equivalent contacts to ensure low resistance and long service life.

Because it is part of the aircraft’s primary electrical system, correct function is essential for safe operation and system reliability.

Key features include:

Piper 587-829 rocker switch assembly (BAT/ALT control)
PAC 99377-05 equivalent reference part
Controls battery and alternator electrical system functions
Installed in cockpit electrical switch panel
Provides reliable on/off electrical power management
Designed for vibration and cockpit environment conditions
Durable aviation-grade switch construction
High-reliability internal electrical contacts
Supports normal and emergency electrical system operation
Direct replacement part per Piper IPC specifications