What Is Part 9913‑1?

Part number 9913‑1 is an emergency battery module used for lighting and avionics backup on long-range business aircraft such as the Citation X/XLS series. Equipped with high‑cycle alkaline chemistry, this sealed battery unit is compact (packed dimensions approximately 10.25″ × 6.35″ × 6.85″) and weighs around 4.3 lb, with a nominal shelf life of about six months when stored charged. While sitting offline, the battery can remain at partial discharge, but typically recharges automatically when reinstalled on the aircraft systems. The unit may take several hours to reach full charge if fully depleted.

Why Repairability Is a Game Changer

A certified FAA/EASA-certified repair station now officially supports Part 9913‑1 through an overhaul and exchange program. With batteries often aged or no longer stocked, this option enables operators to return serviceable units rapidly—for a fraction of the cost of new OEM items—while retaining traceability and full airworthiness documentation.

Under the program, returned units undergo complete inspection and restoration using approved procedures, including recalibration and testing, followed by issuance of return-to-service certification acceptable for both U.S. and European registry aircraft.

What the Repair Includes

The certified service process typically covers:

Full teardown inspection and evaluation based on schematic‑based diagnostics

Replacement or refurbishment of internal high‑cycle batteries

Bench-tested capacity and discharge/charge validation

Built-in test indicator reset and validation

FAA/EASA‑accepted airworthiness certification issued upon return

This ensures units meet or exceed original specifications—even when original manufacturers no longer support the part.

Key Benefits for Operators

Feature

Operational Benefit

Swift turnaround

Airworthy rebuilds often shipped within 7 calendar days

Cost-effective

Typically much cheaper than sourcing new or brokered units

Regulatory-compliant

Certified for FAA, EASA, and other international authorities

Reliable lifecycle support

Cartridge format allows multiple years of service life

Loaner/exchange options

Availability of standby units to reduce AOG time

This service path eliminates long wait times for obsolete parts and reduces logistic friction.

How to Proceed If You Have This Unit

Verify the dataplate reads “P/N 9913‑1” (not just internal references or extensions).

Contact a repair station that lists this part with dual certified release and maintenance capability.

Ask about loaner or core-exchange options—the quickest route when aircraft dispatch is critical.

Ship the unit per the carrier’s instructions (handling as non-hazardous but fragile cargo).

Review the teardown report and cost estimate before final approval.

Confirm receipt of a signed airworthiness release form and complete logbook documentation.

Built‑In Support & Ease of Use

Although Part 9913‑1 lacks active built‑in diagnostics like BIT (built‑in test), its simplicity and reliability make verification straightforward: installation into the aircraft’s emergency lighting bus will prompt recharge and system readiness check, requiring minimal ground support.

Operators report that modern installations handle overnight recharge without manual intervention.

Final Takeaway

With established use on high-end business jets and proven design reliability, Part 9913‑1 remains a critical emergency power component. Thanks to newly introduced certified repair and exchange services, operators can now restore units to nearly-new condition with rapid turnaround and FAA/EASA compliance. This solution is especially valuable for maintenance teams working with legacy aircraft or managing AOG events, offering cost-efficient continuity of essential systems without disruptions.