☣️ UN 3165 • CLASS 3
Aircraft hydraulic power unit fuel tank
Placard: Flammable. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
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⚠️ This page is a quick-reference aid. For real incidents: stage upwind, isolate, deny entry, request Hazmat early, and consult the current ERG + SOP/SOG.
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Quick details
UN 3165
Class: 3
Placard type: Flammable
ERG: Guide 131 (check current ERG)
Isolation: ERG 131: Initial isolation 50m in all directions; for large spills isolate 100m and evacuate 800m downwind if fire involved
Chemical & Response Details
| Also known as | Aircraft hydraulic power unit fuelAPU fuel tankAuxiliary power unit fuelAviation hydraulic fuel mixture |
| Appearance | Clear to straw-colored flammable liquid mixture with characteristic petroleum or hydrocarbon odor. Typically contains hydrocarbons and additives designed for aircraft auxiliary power systems. |
| Flash Point | Typically 38-60C (100-140F) depending on formulation |
| Boiling Point | Variable, typically 150-300C (302-572F) depending on hydrocarbon blend |
| Vapor Density | Greater than 1 (heavier than air) |
| Water Reactivity | No significant reaction with water; fuel will float on water surface |
| Extinguishing | AFFF or alcohol-resistant foam preferred; CO2, dry chemical, water fog acceptable |
| PPE | ⚠️ Level B minimum recommended; SCBA required in confined spaces or heavy vapor areas; chemical-resistant gloves and suit for liquid contact |
| Isolation | ERG 131: Initial isolation 50m in all directions; for large spills isolate 100m and evacuate 800m downwind if fire involved |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- TOXIC; may be fatal if inhaled, ingested or absorbed through skin.
- Inhalation or contact with some of these materials will irritate or burn skin and eyes.
- Methyl chloroacetate (UN2295) is an eye irritant/lachrymator (causes flow of tears).
- Fire will produce irritating, corrosive and/or toxic gases.
- Vapors may cause dizziness or asphyxiation, especially when in closed or confined areas.
- Runoff from fire control or dilution water may cause environmental contamination.
- HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
- Vapors may form explosive mixtures with air.
First actions (field-minded)
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- Isolate spill or leak area for at least 50 meters (150 feet) in all directions.
- For highlighted materials: see Table 1 - Initial Isolation and Protective Action Distances.
- For non-highlighted materials: increase the immediate precautionary measure distance, in the downwind
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UN 3165 — Aircraft hydraulic power unit fuel tank HAZMAT RADIO NOTE — UN 3165
Product: Aircraft hydraulic power unit fuel tank
Class 3 / Flammable / ERG 131
PPE: Level B minimum recommended; SCBA required in confined spaces or heavy vapor areas; chemical-resistant gloves and suit for liquid contact
ISOLATION: ERG 131: Initial isolation 50m in all directions; for large spills isolate 100m and evacuate 800m downwind if fire involved
ACTION: Stage upwind · Isolate · Deny entry · Request HazmatRADIO
Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.
=== IC HAZMAT BRIEFING ===
UN 3165 — Aircraft hydraulic power unit fuel tank
Class: 3 | Placard: Flammable | ERG Guide: 131
Appearance: Clear to straw-colored flammable liquid mixture with characteristic petroleum or hydrocarbon odor. Typically contains hydrocarbons and additives designed for aircraft auxiliary power systems.
Water Reactivity: No significant reaction with water; fuel will float on water surface
Extinguishing: AFFF or alcohol-resistant foam preferred; CO2, dry chemical, water fog acceptable
PPE: Level B minimum recommended; SCBA required in confined spaces or heavy vapor areas; chemical-resistant gloves and suit for liquid contact
Isolation: ERG 131: Initial isolation 50m in all directions; for large spills isolate 100m and evacuate 800m downwind if fire involved
— Key Hazards —
• TOXIC; may be fatal if inhaled, ingested or absorbed through skin.
• Inhalation or contact with some of these materials will irritate or burn skin and eyes.
• Methyl chloroacetate (UN2295) is an eye irritant/lachrymator (causes flow of tears).
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• Ventilate closed spaces before entering, but only if properly trained and equipped.
SOURCE: allfirefighter.com/hazmat/un/3165 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3165 Aircraft hydraulic power unit fuel tank Cls3 ERG131 | allfirefighter.com/hazmat/un/3165SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS. Includes link to full page.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions. Page: https://allfirefighter.com/hazmat/un/3165
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FAQ
TOXIC; may be fatal if inhaled, ingested or absorbed through skin. Inhalation or contact with some of these materials will irritate or burn skin and eyes. Methyl chloroacetate (UN2295) is an eye irritant/lachrymator (causes flow of tears). Fire will produce irritating, corrosive and/or toxic gases. Vapors may cause dizziness or asphyxiation, especially when in closed or confined areas. Runoff from fire control or dilution water may cause environmental contamination. HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors may form explosive mixtures with air.
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Keep unauthorized personnel away. Stay upwind, uphill and/or upstream.
Level B minimum recommended; SCBA required in confined spaces or heavy vapor areas; chemical-resistant gloves and suit for liquid contact
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 131 and your department SOP/SOG for incident-specific protective actions.
Sources (high level): DOT/PHMSA marking & class concepts + ERG usage principles. This page does not reproduce ERG guide text—always consult the current ERG for incident-specific protective actions.