Concept ALTS (Aircraft Leak Testing System)

  • Manufactured By Concept in the UK under ISO 9001
  • Rapidly locates leaks in aircraft fuselages, allowing "ranking" of leaks
  • Non contaminating, non toxic, safe smoke
  • Can utilise aircrafts own 115v 400 - 450hz power supply
  • Extremely persistent smoke created
  • NATO Codified
Specification: Concept ALTS  (Aircraft Leak Testing System)
Size (cm) Generator only / In Flight case 42 x 18 x 35  /  54 x 54 x 60
Weight (kg) - Generator only / In Flight case 13kg  /  49kg
Heat Exchanger (w) 1100w (1.1kw)
Power Supply 110VAC, 50 - 450Hz
Warm up time from cold (min) 4 mins
Duration at max output before refill (min) 40 mins
Smoke Output (m3 / min @ 1m visibility) 0 - 150
Smoke Reservoir Capacity (nominal ml) 1300 ml
Smoke Particle dia (micron, mass median dia) 0.2 with GSD circa 1.35
Optimum / max gas pressure (bar) 6.9 / 8.2
Remote Operation Included with every model

The Concept ALTS was developed by Concept for the Royal Air Force to enable the fast and accurate leak testing of its wide-bodied aircraft.

The ALTS produces a sub-micron, non-contaminating, artificial smoke (entrained in inert carrier gas) in the aircraft fuselage, utilising the aircraft’s own 115v 400-450 Hz supply. The unit will also operate on 50 Hz.

The unit uses the same chemical smoke type that has been used for over 30 years in the aircraft simulator environment.

Once the fuselage is filled with smoke to a dense concentration (typically a visibility through the smoke of 0.5m), a process that takes only a few minutes, the aircraft is pressurised.

An examination of the exterior of the aircraft rapidly reveals not only the areas of leakage, but allows the "ranking" of leaks (the bigger the leak, the greater the amount of smoke being visibly emitted). 

Want more information, advice or prices? email us: 

The Concept ALTS is supplied with:

• ALTS smoke system 110v 50 - 450Hz
• CO2 cylinder 2kg
• CO2 regulator
• 5 litre Smoke Oil 135
• Low Voltage Remote Control System
• Flight Case

The RAF concluded in their assessment of the Concept ALTS:

"Use of smoke as a means by which to detect cabin pressurisation leaks has been shown to be extremely effective and is unquestionably superior to any alternative detection method used to date"

Related links for leak testing / pressurisation applications:

Leak Testing Overview
Concept ViCount Oil based Smoke Generator (large scale applications)
Spirit 900 Water based Smoke Generator (medium scale applications)
Colt 4 Turbo Water based Smoke Generator (small scale applications) 

Smoke Generator

Concept ALTS (Aircraft Leak Testing System)

Product Code: CEL-ALTS-KIT

As described above.  Each ALTS smoke systems comes as a complete ready to use kit, including; the smoke generator, 2kg CO2 cylinder, CO2 regulator / hose, 5ltr Smoke Oil 135, low voltage wired remote control and flight case.  

Every ALTS smoke system comes with a 5 year parts warranty and a lifetime guarantee on the heat exchanger block.  

The ALTS flight case is custom made and designed to carry all of the above equipment.  It is on heavy duty castor wheels.

Smoke Generator Modifications

Stainless Steel ALTS

Product Code: CEL-ALTS-MOD-SS

The same smoke generator as described above but in a stainless steel chassis optimum service life.

Timer Module (built in)

Product Code: CEL-ALTS-MOD-TM

The Timer Module allows users to set the "smoke on" & "smoke off" periods.  It is an ideal way to economically maintain smoke levels once the initial required smoke concentration has been met.  The timer is set via the smart digital controller.

Accessories / Consumables

CO2 Cylinders

Product Code: VC-CYL-2KG, VC-CYL-5KG

Spare light weight aluminium CO2 cylinders are available in either 2kg or 5kg bottles.

CO2 Regulator 

Product Code: VC-REG-CO2-1S2G

A single stage, double gauge CO2 regulator is used to control the pressure / output from the ALTS smoke system.  The regulator comes is a BS 341-3 No.8 stem, however a CGA 320 stem is available for US customers.

Heavy Duty CO2 Regulator

Product Code: VC-HD-REG-CO2-1S2G

For ultimate protection a heavy duty single stage, double gauge CO2 regulator is available.  This regulator comes with a gauge guard and a multi-stage crumple zone. 

Spare CO2 Gauge

Product Code: VC-GAUGE-B, VC-GAUGE-R

Spare CO2 gauges are available on request.  Both gauges (bottle pressure and regulator pressure) are available.

Spare CO2 Hose / Connections

Product Code: VC-HOSE-CONN2A

A spare CO2 Hose with appropiate quick connections are available.


Smoke Oil 135

Product Code: S/OIL-135-5, S/OIL-135-25, S/OIL-135-205, S/OIL-135-IBC

Smoke Oil 135 is available in 5ltr, 25ltr, 205ltr or 1000ltr containers.


Ducting Adapters 

Product Code: ADAP-25-LD, ADAP-25-HD, ADAP-50, ADAP-75

These ducting adapters are designed to be attached directly onto the front of all Concept smoke machines allowing smoke to pass through flexible hose.  They are available in 25mm, 50mm & 75mm. All ducting adapters are quick and easy to install.

Neoprene Hose 25mm

Product Code: HOSE-NEO-25-2, HOSE-NEO-25-4

The neoprene hose is ideally suited for use with Concept Smoke generators.  It offers a high temperature resistance, has low air frictional loss properties due to additional inner layer, is light, kink and spark proof.  Available in 2mtr or 4mtr lengths.

Silicone Hose 25mm

Product Code: HOSE-SILI-25-2, HOSE-SILI-25-4

The silicone hose is also ideally suited for use with Concept Smoke generators.  It offers a high temperature resistance, has low air frictional loss properties due to additional inner layer, is light, kink and spark proof.  Available in 2mtr or 4mtr lengths.

P2A 50mm & 75mm Flexible Hose 

Product Code: HOSE-P2A-50-10, HOSE-P2A-75-10

The P2A hose is available in 10mtr lengths (50mm or 75mm).  It is a double ply PVC coated polyester fabric with an encapsulated spring steel wire helix. It is very flexible and easily compressed.  Available en 10mtr lengths.   


Demonstration movies

Concept ALTS - RAF Hercules


Concept ALTS Brochure
Concept ALTS Price List
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Confined Space Rescue Program Manager - North Tree Fire

ViCount use in Hot Fire Trainer

The machine has performed flawlessly up to this point and I purchased the machine from you at least six or seven years ago.

I have to confess I have never cleaned the orifice with the drill as you mentioned.

Actually, after the install, I have never worked on the machine again which, I am sure, is at least neglect on my part.

We originally had two smoke generators in the trainer, one fore and one aft.   The other machine (not Concepts) is quite a bit older
and it quit about two years ago but we found that the ViCount generated so much smoke we did not really need two machines.

The machine is protected from the heat of the trainer by a bulkhead with a port for the smoke to get through.

To give you an idea of the efficiency and quantity and the character of the smoke, the ceiling temperature inside the trainer as verified by two gauges reaches about 1300 degrees F. The smoke level inside the trainer is maintained quite adequately from the floor to about the
four and one half foot level but not much higher due to the temperature. We have found that it burns off at about 450 degrees F (230C).

Your smoke machine has trained hundreds of line Firefighters from all over the US including from major metropolitan Fire Departments such as Los Angeles County Fire, Pasadena Fire, San Jose Fire, Las Vegas Fire, Oakland Fire, Berkeley Fire, Sacramento Metro Fire, Cal Fire, and many federal agencies as well.

The training and experience those fire fighters receive in the intense heat and disorientingly smoky environment the ViCount helps create has without question saved lives and injuries as well as millions of dollars of property damage that may have occurred without the level of training
the ViCount helps provide.

Thank you for your help and support.

Best regards,

Mitch Ward CIHM
NorthTree Fire
Confined Space Rescue Program Manager