Goodrich Aerospace D717-01-100 Sealed Ni-Cad Battery Pack

The Goodrich Aerospace D717-01-100, also cataloged as the D717-01-100 Sealed Ni-Cad Battery Pack, operates as a dedicated hardware component for emergency cabin lighting power delivery within Boeing aircraft series platforms. It provides autonomous electrical energy storage to drive backup illumination pathways during primary power bus failures.

Hardware Specifications

Aerospace Power Storage and Battery Chemistry

• Cell Volumetric Efficiency and Thermal Performance: The nickel-cadmium internal cell matrix is contained within a sealed, ruggedized housing designed to withstand pressure fluctuations and acceleration profiles encountered in flight operations. The internal separation layers optimize electrolyte distribution, maintaining cell internal resistance baseline values across extreme temperature scales from -20 to +60 deg C.
• Autonomous Standby Power Routing: The module integrates directly into the aircraft cabin emergency power network. Under normal operating conditions, the battery receives a continuous trickle charge from the main utility bus; upon a localized bus undervoltage deployment signal, internal heavy-duty contacts redirect the stored chemical energy directly to emergency egress indicators.

Frequently Asked Questions

Q: What technical indicators establish the need for physical replacement of the D717-01-100 pack during scheduled maintenance intervals?

A: Technicians must evaluate the terminal voltage under fixed-load discharge tests and verify capacity parameters against FAA/EASA airworthiness minimums. If the pack exhibits significant cell voltage imbalance, electrolyte leakage through the venting valves, or fails to maintain rated current across the specified duration, it must be removed from service.

Q: How does the internal cell chemistry respond to continuous floating charge states from the aircraft electrical bus?

A: The sealed Ni-Cad chemistry is engineered to resist degradation from prolonged float charging. Internal gas recombination pathways handle oxygen generated during overcharge states, preventing pressure build-up and ensuring long-term capacity retention without inducing terminal voltage depression effects.