APU Services

Capabilities | Support | Training

Hamilton Sundstrand: A Gulfstream Exclusive

Gulfstream is your one source for Hamilton Sundstrand APUs, providing both major service and line maintenance. We are exclusively responsible for Hamilton Sundstrand tecnical support worldwide as well as parts distribution, customer training, repairs, publications, technical assistance and AOG support.

In fact, Gulfstream trains other technicians — including those outside Gulfstream — to work on Hamilton Sundstrand APUs. As a service to our customers, Gulfstream provides 24/7 support for Hamilton Sundstrand APU components. Our technicians are on call to help you solve APU problems and provide technical support. You get the benefit of their expertise at no charge. Call any time.

It’s obvious. Gulfstream knows Hamilton Sundstrand. Doesn’t it make sense to go with the company that trains everybody else?

Major Service and Line Maintenance Support

Gulfstream APU service is comprehensive. We handle repair, maintenance and replacement with expertise and efficiency. On heavy jobs — such as turbine assembly repairs, rotor balancing, Electronic Sequence Unit (ESU) and Line Replaceable Unit (LRU) repairs, and reliability upgrades — the average shop visit ranges from seven to 10 days.

Our line maintenance support includes parts, APU inspections, preventative maintenance, APU and component replacement, and troubleshooting.

Technical Manuals

Gulfstream is your exclusive source for Hamilton Sundstrand APU component and training manuals. We maintain and update the manuals in our electronic library. Organized by model, these manuals are available by subscription at apu.mygulfstream.com. To initiate your subscription click here.

Download APU Technical Manual Revisions Dates (PDF)

We Keep It in Stock

Gulfstream maintains an extensive spare-parts inventory and a large pool of exchange and rental APUs, ready for same-day shipment. Our electronic repair technician works full time to keep ESU and STAB (Speed, Temperature, and Air Bleed) boxes repaired and in service. This is a challenging business. Many of the internal parts are obsolete and difficult to obtain. Our technician and buyers work closely with our vendors to keep parts supplies available.

Passing the Test

Gulfstream runs every APU in our test cell to validate performance before it is certified and returned to service. We also utilize the test cell for troubleshooting unusual APU performance issues, ESU fault code verification, and pinpointing fluid leaks.

A Leader in Innovation

Gulfstream developed the Gulfstream Universal APU fuel pump and fuel control test bench to support our APU services. This state-of-the-art fuel bench is capable of calibrating and testing fuel controls and pumps from various manufacturers, including Hamilton Sundstrand and Honeywell.

No-charge Loaners

When your Electronic Sequence Unit (ESU) or Speed, Temperature and Air Bleed (STAB) box is in our shop for repair, Gulfstream will provide you with a no-charge loaner until we've fixed your component. We have also developed specialized test equipment to assist in the troubleshooting process. Our customers can rent or borrow these tools and perform the analysis at their own location.

Customer Training

Gulfstream provides formal APU Line Maintenance training. We offer two-day courses for the Gemini and T39/T40 series. This training is FAA approved, and our schedule is on the Gulfstream Web site.

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