FAA & EASA APPROVED
Fuel Quantity Probes & Senders.
CiES CC-Series fuel senders are Technical Standard Order (TSO) certified to C55a and associated SAE AS405c.
View TSO-C55a | View STC/AML | View EASA STC
They have also met all the DO-160(F) and DO-254 DAL (Design Assurance Level) Level D requirements for the TSO.
Note: The conditions and tests required for TSO approval of this instrument are minimum performance standards. Those installing this instrument, on or in a specific type or class of aircraft, must determine that the aircraft installation conditions are within the TSO standards. TSO articles must have separate approval for installation in an aircraft. The instrument may be installed only according to 14 CFR part 43 or the applicable airworthiness requirements.
General Specification
TSO-C55a
Floats, arm lengths, and travel angles vary depending on tank dimension and application.

Accuracy Range
Angular Travel Range of Sensor
0.18° CiES between angular steps.
1024 Discreet points over 180° swing.

Temperature
Operating Temp Range
-55° to 85° Celsius (C)
-67° to 185° Fahrenheit (F)
Voltage
Operating Voltage Range
9–28 VDC
Signal Output Options
Frequency/Resistance/Voltage
Output Type | Signal | Range | Output Range | Formula | Rise Time |
---|---|---|---|---|---|
Temperature | Output to be the following: | ||||
Option 1 | 0-5 Vdc Square Wave | -50°C to 50°C -58°F to 122°F | FREQ 1,200Hz - 490Hz | Temp = 123 - (87,252.07 / Frequency) | 105nS |
Fuel Level | Output to be one of the following: | ||||
Opt 1 Frequency | 0-5 Vdc Square Wave | 5° - 175° Angular Travel | FREQ 16,384Hz - 64Hz | FREQ (Hz) = 65,538 / (4 + (Deg * 5.6889)) | 115nS |
Opt 2 Resistance | Resistance 0 - 280 Ohm | 5° - 175° Angular Travel | Resistance 0 - 280 Ohm | ||
Opt 3 Voltage | Voltage 0 - 5 Vdc | 5° - 175° Angular Travel | Voltage 0 - 5 Vdc |
Mounting & Installation
CiES Fuel Senders
CiES senders are designed to be a side or top mount configuration. Torque screws 18-22 inch-pounds (in lb) using a crossing pattern.
Warning: Over-torquing or using a circular pattern may cause “damage” to gasket and/or sender.
Note: Hardware is “NOT” supplied with senders unless requested. We recommend AN, AS, NAS, MS or equivalent hardware.

SAE AS405c
CiES Fuel Senders
3.1.1 | Materials | 5.5 | Position |
3.1.2 | Workmanship | 5.6 | Test Liquid |
3.2 | Identification | 6.1 | Scale Error |
3.3.1 | Temperature | 6.2 | Friction |
3.3.2 | Humidity | 6.3 | Leak Test |
3.3.3 | Vibration | 6.4 | Position Error |
3.3.4 | Altitude | 6.5 | Power Variation |
3.3.5 | Fire Hazard | 6.6 | Dielectric |
3.3.6 | Seal | 6.7 | Maximum Operating Temp |
3.4 | Radio Interference | 7.0 | Qualification Tests |
3.5 | Magnetic Effect | 7.1.1 | Low Temperature |
4.3 | Power Variation | 7.1.2 | High Altitude – Low Temp |
4.4 | Power Indication | 7.3 | Vibration |
4.5 | Tank Moving Parts | 7.3.1 | Resonance |
4.6 | Filling Medium | 7.3.2 | Cycling |
5.1 | Atmospheric Conditions | 7.4 | Humidity |
5.2 | Vibration | 7.5 | Magnetic Effect |
5.3 | Vibration Equipment | 7.6 | Sealing |
5.3.1 | Linear Motion Vibration |
DO-160
Environmental
The TSO article meets the minimum operation performance standard requirements (MOPS) for TSO C55a.
Environmental Qualification Per RTCA/DO-160(F) | ||
---|---|---|
4.0 | Temperature & Altitude | B2 |
5.0 | Temperature Variation | B |
6.0 | Humidity | B |
7.0 | Operational Shocks | A |
8.0 | Vibration | S (M) |
9.0 | Explosive Atmosphere | E1,2 |
15.0 | Magnetic Effect | Z |
16.0 | Power Input | B |
17.0 | Voltage Spike | B |
18.0 | Audio Frequency Susceptibility | B |
19.0 | Induced Signal Susceptibility | ZC |
21.0 | Emission of Radio Frequency Energy | L |
25.0 | Electrostatic Discharge | A |