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How am I able to put CiES fuel sender  in my type certificated aircraft?

The FAA, and CiES combined their expertise to enable the installation of FAA TSO fuel quantity systems into certain type certificated GA aircraft.  Based on the success of our proven TSOA process and commercial success in OEM programs, the FAA is authorizing STC installation of the CiES digital fuel senders  as a replacement for existing resistance based fuel quantity in  GA aircraft. 

What is the pricing and availability of the CiES digital fuel sender configured for these applications?

This is similar STC to those found for electronic displays in aircraft.   Pricing is per application but thee senders average $390 each location.   These new manufacture digital senders are competitively priced against old technology rebuilt resistance senders.

CiES has a variety of outputs and configurations as we 

can output a digital signal to:


Aerospace Logic - D series

JPI 930 / 960

EI CGR-30 & MVP-50

Or an analog signal to:

Aerospace Logic - Voltage

JPI 900



Contact CiES for interface with a standard analog gauge.

What is the pricing of the STC?

The cost for the STC is included in the sender kit price finalized shortly by CiES. The STC will be available 

Who is CiES? (pronounced 

CiES Inc is the leading producer of fuel quantity systems for OEM GA aircraft and rotorcraft.  With over 15,000 systems equipped all over the world. The FAA worked with CiES on obtaining this STC because of our proven success in the market.  CiES’s product line spans from small aircraft and UAZV systems to Jet and turboprop aircraft the. The CC2840 Series digital sender is the second iteration of CiES patented digital fuel quantity technology, and is flown in thousands of aircraft installed and flown since 2012.

What aircraft are approved under this STC?

The STC allows for installation in

Cessna 170, 172, 175, 177, 180, 182, 185, 206, 207

Piper PA-23, PA-24, PA-28, PA-30, PA-31, PA-32, PA-34, PA-44 



Beech 33,35,36,55, 58




More aircraft to follow. Your aircraft must have been equipped with a removable resistive or capacitive sender at time of manufacture to be eligible.

Answers To Your Questions

Fuel gauges don't work in GA aircraft, why would installing your product be different

Original resistive aircraft  fuel senders were designed to measure approx. 20 gallons and provide a resolution of 0.3 of a gallon between readings..  These resistive senders were intended for automotive and farm machinery applications.  The aircraft application places additional stresses on these commercial products, from moisture born corrosion to large movements in fuel in and out of plane of the sender.  Cies designed a aviation grade fuel sender from the outset.  We addressed the moisture and corrosion issues, we addressed fuel motion in all axis and we designed a system to give excellent resolution less than (1/10 of a gallon) for fuel tanks that can hold hundreds of gallons of fuel. 

I have a fuel totalizer why would I need a working fuel gauge.

A functional fuel gauge is required by regulation.  While some in aviation cast a broad net on what working means, according to the FAA it means the ability to accurately show usable fuel in each tank.  Gauges that waver or show merely a trend in operation are not functional.  Fuel gauges are required as it takes the fundamental issue of pilot impression of starting fuel level out of the equation.  

I heard fuel gauges only have to be accurate at zero?

While even some in the FAA Flight Standards Offices quote this as verbatim truth, it is absolutely not true.  CiES works with all of the FAA ACO offices and the FAA Small Aircraft directorate.   Usable fuel is an accurate value for every certificated aircraft flying.  So yes zero usable fuel is an accurate number, but so is full usable fuel (that value is on the fuel filler placard and in your POH).   Using simple math 1/2 usable fuel is also an accurate number.  The zero fuel accurate myth is just that, myth.  

How accurate will my fuel indication be?

If you pair the CiES digital senders with a digital instrumentation, we typically see usable fuel remaining numbers within a gallon of a properly calibrated fuel totalizer in level flight still air.  The CiES remaining fuel value will be more accurate the closer the fuel gauge gets to zero.   Analog instrumentation and interface will give slightly less accuracy.    Note: There are issues that are part of the aircraft fuel tank design such as sender overlap on multi sender fuel tanks or excessive restriction of fuel flow in a multi element tanks that cause fuel indication  issues 

What does installation entail?

The STC requires that the CC2840 Series digital fuel sender to replace the existing fuel level sender(s). The CC2840 Series digital fuel level requires aircraft power to operate.  A protected power wire needs to be added from the aircraft electrical bus.

Will the CC2840 Series digital fuel sender fit in my tank?

In most GA aircraft the sender is mounted to the tank structure in a standard 5 bolt pattern.   We utilize this same pattern in our billet machined sender housings.   In most fuel sender applications this is a bolt in replacement 

How much does it cost to install?

Initially, this will depend on the installer’s rates and experience. The CC2840 series fuel sender was originally designed to be installed by aircraft manufacturers.  Mechanics will be impressed by how easy it goes in. 

Can I install it myself?

STC installations ultimately require approval from an A&P with Inspection Authorization (IA), and will require an FAA form 337. Aircraft owners who work on their aircraft under the supervision and approval of an appropriately rated mechanic could apply this STC to their aircraft in that manner.

When will the CC2840 Series digital fuel sender and associated STC be available? 

We are currently in production with the CC2840 Serioes digital fuel sender.  The STC will be available for order from CIES @ Oshkosh Airventure 2016, with STC and product order fulfillment starting after the show. Orders of CiES products will be filled by CiES and its dealers in the weeks after Oshkosh.

Does the CC2840 Series digital sender that can be installed in a type certificated aircraft have the exact features as the CC2840 Series available for the OEM market?

They are the same product and have the similar capabilities.  We re-purposed a  jet fuel temperature output to allow a low fuel annunciation in the STC sender.  

How does the installation affect the Weight & Balance of my aircraft?

Typically, installing an CC2840 Series senders changes the aircraft weight less than the senders they are replacing

Does the CC2840 digital fuel sender TSO’d? Does CiES have PMA?

Yes. This STC demonstrates that  are suitable for use in type certificated aircraft. This is the only TSO fuel sender available for retrofit in GA aircraft.   The TSO insures quality fuel level reporting under all aircraft conditions and it insures that the product manufacturing has been accomplished in FAA approved quality system.  TSO products do not require PMA. 

What is the pedigree of the CiES CC2840 Series ?

CiES and Cirrus Aircraft, CiES launch partner successfully demonstrated that CiES aviation-proven manufacturing and development process yielded a superior product that is suitable for use in all type certificated aircraft.  CiES is qualified to RTCA DO-254 and the digital fuel senders exposed to the aircraft environmental conditions for wing mounting by RTCA DO-160.

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