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IS 4862:2000 (Part 1) is the Indian Standard (BIS) for portable fire extinguishers for aircraft, part 1: halon 1211 type. This standard specifies the requirements for materials, construction, performance, and testing of Halon 1211 (BCF) portable fire extinguishers specifically designed for aircraft applications.
Specification for portable fire extinguishers for aircraft, Part 1: Halon 1211 Type
! Halon 1211 is an ozone-depleting substance governed by the Montreal Protocol; its use is strictly limited to critical applications like aviation where approved clean-agent drop-in replacements are still evolving.
! Since Halon 1211 is stored as a liquefied gas, routine maintenance relies heavily on precise weighing rather than just pressure gauge readings to detect leakage.
! Extinguishers used in aircraft must withstand significant pressure variations and vibration, requiring rigorous adherence to the standard's construction and testing clauses.
ISO 7165:2017ISO (International Organization for Standardization)
HighCurrent
Fire-fighting — Portable fire extinguishers — Performance and construction
Specifies requirements for portable fire extinguishers for aircraft, including Halon 1211 and its modern replacements.
MIL-PRF-38700DU.S. Department of Defense
HighCurrent
Extinguisher, Fire; Hand, Portable, Halon 1211
Defines performance requirements for military-grade hand-portable Halon 1211 fire extinguishers, many used in aviation.
UL 1093, 5th EditionUnderwriters Laboratories (UL), USA
MediumCurrent
Standard for Halogenated Agent Fire Extinguishers
Covers construction and performance of Halon and Halocarbon extinguishers, but is not specific to aircraft applications.
RTCA/DO-160GRTCA, Inc. (Radio Technical Commission for Aeronautics), USA
LowCurrent
Environmental Conditions and Test Procedures for Airborne Equipment
Does not specify the extinguisher itself, but defines the environmental tests (vibration, temperature, etc.) that aircraft extinguishers must pass.
Key Differences
≠IS 4862 is exclusively for Halon 1211, reflecting its 2000 origin. Modern standards like ISO 7165:2017 are broader, including specifications for environmentally acceptable Halon replacement agents while treating Halon 1211 as a legacy agent for critical use.
≠The Indian standard specifies its own vibration test protocol (based on IS 13038). In contrast, international aviation practice (e.g., ISO 7165) references comprehensive environmental testing standards like RTCA/DO-160, where test profiles are tailored to the specific aircraft type (e.g., jet, turboprop, helicopter).
≠IS 4862 mandates a stricter minimum Halon 1211 purity of 99.0% (per IS 11833), whereas the equivalent ISO standard (referencing ISO 7201-1) requires a higher purity of at least 99.6%.
≠The calculation method for the cylinder's hydrostatic test pressure differs. IS 4862 uses a formula involving 2.5 times the developed pressure at 70°C, while ISO 7165:2017 specifies a test pressure of 1.43 times the maximum developed pressure at 70°C.
Key Similarities
≈Both IS 4862 and its international counterparts like ISO 7165 specify Halon 1211 as a suitable extinguishing agent for Class A, B, and C fires commonly found in an aircraft cabin.
≈The fundamental construction requirements for the extinguisher, including a pressurized cylinder, valve assembly, nozzle, and operating mechanism, are conceptually identical across the standards.
≈Performance criteria such as minimum effective discharge time and discharge range for a given extinguisher size are closely aligned. For example, a ~2.5 kg extinguisher requires a minimum 9-second discharge in both IS 4862 and ISO 7165.
≈Both the Indian and international standards require the extinguisher to be functional and safe across a very wide operating temperature range, typically including -55°C, to ensure reliability in aviation environments.
Parameter Comparison
Parameter
IS Value
International
Source
Agent Purity (Halon 1211)
≥ 99.0% by mass (per IS 11833)
≥ 99.6% by mass (per ISO 7201-1)
ISO 7165:2017
Operating Temperature Range
-55°C to +70°C (mandatory)
Range I: -40°C to +70°C or Range II: -55°C to +70°C (selectable)
ISO 7165:2017
Extinguisher Body Colour
Fire Red (Shade No. 536 of IS 5)
Predominantly red; other colours permitted by airworthiness authority
ISO 7165:2017
Minimum Discharge Time (2.5 kg capacity)
9 seconds
9 seconds (for equivalent 5B rating)
ISO 7165:2017
Vibration Test Specification
As per IS 13038 (10g peak, 10-500 Hz)
As per RTCA/DO-160 or equivalent (profile depends on aircraft)
ISO 7165:2017
Cylinder Hydrostatic Test Pressure
2.5 x Developed Pressure at 70°C (or alternative formula)
1.43 x Maximum Developed Pressure at 70°C
ISO 7165:2017
Internal Corrosion Test
Not explicitly detailed as a separate test in the main body.
Mandatory 28-day test with water-saturated agent at 50°C.
ISO 7165:2017
⚠ Verify details from original standards before use
Can Halon 1211 extinguishers be used in commercial buildings?+
No, due to its ozone-depleting properties, its use is globally restricted to critical-use exemptions such as aviation and specific military applications.
How is a Halon 1211 extinguisher checked for leaks?+
It must be periodically weighed; a weight loss exceeding the specified tolerance (usually 5%) requires immediate refilling or replacement.
What classes of fire is Halon 1211 suitable for?+
It is highly effective for Class B (flammable liquids) and Class C (electrical) fires, leaving no residue, which is vital for aircraft avionics.