Lone Star Step Up 12V To 24V Converter

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Part# 11-02888
MFR Model# LS03-05002B


Lone Star Aviation's new 12V STEP-UP Converter is the smallest (3" x5" x 2"), most efficient (93-95%) and the most versatile STEP-UP aircraft converter in our industry today. RTCA/DO 160D tested to operate 28V NAC/COM radio equipment such as KX 155, KX 165, KY 196A, KY 196B, and Motorola VHF transceivers on 12V aircraft. Additional 28V electronic devices are HSI, cameras, audio panels, battery backup systems, etc.

TSO : TSO-C71 / FAA APPROVED : LS03-05002-B
California Prop 65 Warning Symbol

WARNING: Cancer and Reproductive Harm -


  • Ultra-Small size: 2.5" x 4.5" x 2.0"
  • Light Weight
  • Potentiometer for output adjustments
  • Universal Mounting
  • LED Status Indicators
  • Easy Installation
  • Optional Connector: MS 3102 Receptacle


  • Input Voltage: 9-20 Vdc
  • Input Transient Surge protection: Mil Std-704D
  • Input: Reverse polarity protection
  • Output Voltage: 27.5 Vdc
  • Output Current: 8 Amps, 10 Peak
  • Efficiency: 90% (13.5 Vdc @ 8A)
  • Short Circuit: Auto Recovery
  • Over Voltage: 20 Vdc Max
  • Over Current: 110-140% > 11.0A Auto Recovery
  • Output Ripple: 20-25mVp-p
  • Terminal Block: (4) Phillips Pan Head Screws
  • MTBF: 100,000 Hrs./ According to Mil HBK 217F
  • FAA Approvals: TSO- C71
  • Altitude: 50,000 Ft
  • Mechanical: 2.50W x 4.5L x 2.0H
  • Weight: .70lbs, 320 grams
  • Temperature: -55C to (+) 71C
  • Circuit Protection: OV, UV, SC, SP, RP, OC
  • Regulation Load: +/- .5%
  • Ripple Input/Output: 20-25mVp-p
  • Transient response time .5 ms
  • TSO Category: Category A
  • Accessories
  • Frequently Purchased With
  • Customers Also Viewed


Have two of these in two helicopters powering radar altimeters. Since 2009 have never had a unit failure. One ship it powers 28 V LED Nav lighting, even a short in the tail LED wiring did not damage unit. Very impressed.

Aircoastal H
July 13, 2017

Easy to install and verify operation - via the onboard LED light.

Ken H
June 3, 2017

Worked for 1 month

Brian S
August 30, 2018


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: I have a garmin gns 530AW, will this converter handle the 16w transmitter?

Per the manufacturer: Yes, the step up converter (11-02888) will work with a 16w transmitter.

Q: Can this be used on a gps unit that is rated 24 volts in a piper with a 14 volt system?

No, this unit is tested to operate 28V NAV/COM radio equipment only.

Q: How many individual pieces of 28 volt equipment can you connect to a single converter?

Per the manufacturer, 8 amp but it is best to know your exact amp pull for each of your units to make sure you do not exceeds this units limits.

Q: Where is this Lone Star Step Up step up converter manufactured - COO?

These are made in the USA.

Q: Does Lone Star offer a warranty on this item?

Lone Star offers a one year limited warranty. Transportation costs provided by buyer.

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