UBSH-1-4-4

UBSH-1-4-4 bottle in aircraft fire-extinguishing systems

The UBSH-1-4-4 is a fixed spherical aircraft fire-extinguisher bottle used in onboard fire-extinguishing systems. It is not a portable cabin extinguisher; it is installed as part of a stationary fire-protection system and connected to distribution pipelines leading to protected compartments. The bottle stores extinguishing agent under pressure and releases it after a command from the aircraft fire-protection system. This type of bottle is used on helicopters and aircraft where several fire-risk zones must be protected from one charged bottle assembly.

Meaning of the UBSH-1-4-4 designation

The designation UBSH-1-4-4 identifies the type and basic configuration of the bottle. “UBSH” refers to a unified spherical bottle. The first digit indicates the spherical body type, the second digit indicates the bottle capacity, and the final digit indicates the number of release heads or outlets used in the fire-extinguishing system. In practical supply terms, this designation is important because a similar bottle with a different number of heads or another body configuration may not match the aircraft fire-extinguishing layout.

UBSH-1-4-4 with halon extinguishing charge

The UBSH-1-4-4 is charged with halon-type extinguishing agent, depending on execution and aircraft documentation. Common charges include 114B2 or 13B1. The charge mass depends on the agent used, so the bottle should always be identified by passport, label and aircraft system requirement. The agent is pressurized by a dry gas medium, usually dried air or nitrogen. Correct charge mass and pressure are critical for system performance, because the protected compartments depend on the bottle delivering the required amount of agent through the distribution pipelines.

Release heads and protected zones of UBSH-1-4-4

The UBSH-1-4-4 configuration includes four release heads, which allows the extinguishing agent to be routed to different protected zones or discharge stages according to the aircraft system layout. The heads are normally connected with aircraft fire-protection control circuits and distribution manifolds. On helicopter applications, these protected zones may include left and right engine compartments, main gearbox area, auxiliary power unit compartment or heater area. The exact routing depends on the aircraft model and modification.

UBSH-1-4-4 on Mi-8 / Mi-17 family helicopters

On Mi-8, Mi-17, Mi-171 and related helicopters, UBSH-1-4-4 bottles may be part of the fixed onboard fire-extinguishing system. The bottle is mounted in a dedicated technical compartment, while pipelines carry the extinguishing agent to the protected areas. This installation keeps the bottle outside the most likely fire zone, while the discharge network reaches engine, gearbox, APU or heater compartments. The same general bottle type may also be found on Mi-24, Mi-26, Ka-32 and some An-family aircraft, depending on configuration.

Installation and service checks for UBSH-1-4-4

The UBSH-1-4-4 should be checked as a complete fire-extinguishing bottle assembly, not only as an empty pressure vessel. Maintenance attention normally goes to bottle condition, charge marking, pressure, safety membrane, release heads, fittings, threaded connections, brackets, pipeline outlets and passport validity. Because the bottle works under high pressure and belongs to fire-protection equipment, its service status, charging record and documentation are essential. A bottle without confirmed charge and documentation should not be treated as ready for aircraft installation.

Supply and identification of UBSH-1-4-4

When ordering the UBSH-1-4-4, the full designation should be stated together with the required extinguishing agent, number of heads, charge condition and aircraft type. It is also important to specify whether the unit is required empty, charged, with release heads installed, with passport, after inspection, or as part of a larger fire-extinguishing kit. For aircraft supply, compatibility should be checked against the aircraft parts catalog, fire-extinguishing system diagram and technical documentation for the specific aircraft modification.

Product Type: Fixed aircraft fire-extinguisher bottle
Designation: UBSH-1-4-4 / УБШ-1-4-4
Bottle Type: Unified spherical welded bottle
Function: Storage and release of extinguishing agent in fixed aircraft fire-extinguishing systems
Application / Where Used: Stationary fire-protection systems of helicopters and aircraft
System / Installation Area: Onboard fixed fire-extinguishing bottle assemblies and distribution pipelines
Typical Protected Zones: Engine compartments, main gearbox area, auxiliary power unit compartment, heater compartment, fuel / equipment compartments depending on aircraft configuration
Compatible Aircraft / Equipment: Mi-8, Mi-8MTV, Mi-17, Mi-171, Mi-172, Mi-24, Mi-26, Ka-32; An-24, An-26, An-30, An-32 depending on modification
Marking Interpretation: UBSH — unified spherical bottle; 1 — spherical body type; 4 — 4 L capacity; 4 — four release heads / outlets
Bottle Capacity: 4 L
Number of Release Heads: 4 pcs
Extinguishing Agent: Halon 114B2 or Halon 13B1 depending on execution
Charge Mass, Halon 114B2: 5.64 kg
Charge Mass, Halon 13B1: 4.90 kg
Working Pressure: 14.7 MPa / 150 kgf/cm²
Pressurizing Medium: Dried air or nitrogen
Pressurizing Pressure at +20 °C: 8.0–10.5 MPa depending on extinguishing agent
Safety Membrane Rupture Pressure: 19.6 ±2.0 MPa
Bottle Diameter: Approximately 204 mm
Empty Bottle Weight: Approximately 4.6 kg
Actuation Type: Remote release through aircraft fire-extinguishing control circuits and valve heads
Associated Valve Heads: PGKts-type pyrotechnic valve heads or approved equivalents depending on configuration
Technical Documentation: Product passport, charging / inspection documents and aircraft fire-extinguishing system documentation as applicable

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Warranty
All products are covered by a standard 6-month warranty.
Extended warranty is available upon request and is agreed individually; it may affect the final product price.