Whelen A490 T-DF-28 Strobe Light Power Supply 28V 

This listing is for a genuine Whelen Engineering A490 T-DF-28 aircraft strobe-light power supply designed for a 28-volt DC aircraft electrical system.

The unit’s original data label identifies it as a double-flash strobe power-supply module rated at 28 VDC, 0.85 amps, with a marked weight of 1.2 lbs. It carries visible FAA-PMA and STC SA800EA markings.

Whelen replacement documentation identifies the A490 T-DF-28 as a legacy single-lighthead, double-flash, 28-volt strobe power supply.

Identification Details

• Manufacturer: Whelen Engineering Co., Inc.
• Model: A490 T-DF-28
• Component: Strobe-light power supply
• Operating Voltage: 28 VDC
• Rated Current: 0.85 amps
• Flash Pattern: Double flash
• Supported Lightheads: One
• Serial Number: T-28-24656
• Marked Weight: 1.2 lbs
• Approval Markings: FAA-PMA / STC SA800EA
• Manufacturer Location: Deep River, Connecticut
• Additional Marking: JA26D5010-10
• Inspection Marking: Tested inspection stamp visible
• Date Marking: November; complete year is not clearly readable

Key Features

• Genuine Whelen aircraft lighting component
• A490 T-DF-28 legacy configuration
• Designed for 28-volt DC aircraft systems
• Double-flash strobe operation
• Operates one compatible strobe lighthead
• Remote-mounted power-supply module
• Attached interconnecting cable
• Metal enclosure with four-hole mounting flanges
• FAA-PMA and STC SA800EA markings
• Suitable for inspection, replacement, overhaul, core, or restoration use
• Sold exactly as photographed