11TF30SM-1

11TF30SM-1 in aircraft fuel systems

The 11TF30SM-1 is an aircraft fuel filter designed to remove mechanical contaminants from aviation fuel in onboard fuel systems. It is installed in the fuel supply path where the fuel must be cleaned before it reaches downstream aircraft units. The filter protects pumps, valves, metering equipment and other fuel-system components from solid particles that may be present after tank storage, refueling or fuel circulation through pipelines. Its role is practical and direct: to keep the fuel flow clean enough for stable operation of the aircraft fuel system.

Fuel filtration function of 11TF30SM-1

The main function of the 11TF30SM-1 is filtration of aviation fuel from mechanical impurities. In the system, it performs primary or coarse purification depending on the aircraft fuel-system layout. The filter removes solid particles and helps reduce contamination carried from the tank or fuel line. If the filter element is clogged or damaged, fuel flow may become unstable, hydraulic resistance may increase, and downstream units may receive insufficiently cleaned fuel. This can affect the reliability of pumps, valves and fuel-feed equipment.

11TF30SM-1 after the fuel tank

The 11TF30SM-1 is used after the fuel tank or in another fuel-line position defined by the aircraft documentation. Fuel leaving the tank may contain particles from the tank interior, pipeline residues, contamination after servicing or traces of long-term storage. By filtering the fuel before it reaches more sensitive components, the unit helps maintain stable fuel supply to aircraft aggregates and engines. The exact installation point should always be checked against the fuel system diagram of the specific aircraft.

Filter element 340.146 in the 11TF30SM-1

The 11TF30SM-1 uses a regenerable filter element with designation 340.146. This means the filter element can be serviced according to the applicable maintenance procedure, rather than being treated only as a disposable element. During maintenance, the element must be cleaned, inspected and installed correctly. Damage to the filtering surface, deformation, blocked mesh or poor sealing can reduce filtration quality or increase pressure drop. The filter element should be checked together with the housing, bypass valve and drain device.

Bypass valve and drain device of 11TF30SM-1

The 11TF30SM-1 filter assembly includes a bypass valve and a drain device. The bypass valve opens when pressure differential across the filter reaches the specified value, helping prevent complete interruption of fuel flow if the element becomes restricted. This protects fuel supply continuity, but it also means filtration quality may be reduced during bypass operation. The drain device is used during servicing to remove fuel and accumulated contaminants from the filter housing. Both assemblies should be inspected during scheduled maintenance.

Hydraulic performance of 11TF30SM-1

The filter is rated for a defined flow rate, pressure and hydraulic resistance. A clean 11TF30SM-1 should create only limited pressure drop in the fuel line. If resistance is higher than expected, the cause may be contamination, incorrect cleaning, damaged filter media, poor assembly or internal blockage. A filter can look acceptable externally but still restrict fuel flow inside. For this reason, serviceability should be confirmed by inspection and hydraulic checks, not only by visual condition.

Difference between 11TF30SM-1 and related versions

The 11TF30SM-1 belongs to the same general family as 11TF30SM-0 and uses the same 340.146 filter element according to the supplied data. However, the versions differ in overall dimensions and weight, so the exact suffix must be respected during procurement or replacement. A filter with a similar designation should not be selected only by filtration rating. The mounting space, fittings, housing version and aircraft documentation must also match the target installation.

Supply and inspection of 11TF30SM-1

For procurement or replacement, the full designation 11TF30SM-1 should be specified. It is important to confirm whether the unit is supplied as a complete filter assembly with regenerable filter element, bypass valve and drain device. Before installation, the filter should be checked for housing condition, fitting condition, sealing surfaces, filter element condition, bypass valve operation, drain device condition and compatibility with the aircraft fuel system. Technical documentation should be confirmed where available.

Product Type: Aircraft fuel filter
Designation: 11TF30SM-1
Function: Filtration of aviation fuel from mechanical contaminants
Application / Where Used: Aircraft fuel systems
System / Installation Area: Fuel line after tank or other position according to aircraft fuel system layout
Working Medium: Aviation fuel
Filter Element Designation: 340.146
Filter Element Type: Regenerable filter element
Filtration Fineness, Nominal / Absolute: 16 / 25 µm
Nominal Operating Pressure: 0.3 MPa
Maximum Flow Rate: 10 L/min
Hydraulic Resistance of Clean Filter: Not more than 0.015 MPa
Bypass Valve Opening Pressure Differential: 0.05 ±0.02 MPa
Operating Temperature Range: −60 to +60 °C
Dimensions: B max 125 mm; L max 168 mm
Weight: Not more than 0.78 kg
Scope of Supply: Filter assembly with regenerable filter element, bypass valve and drain device
Related Version: 11TF30SM-0, with different dimensions and weight depending on installation
Inspection / Testing: Housing inspection, filter element check, bypass valve check, drain device check, sealing inspection and hydraulic resistance verification
Condition: As applicable
Technical Documentation: Technical documentation for fuel filter 11TF30SM-1

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