Pacific Scientific 33700002 Aircraft Fire Suppression Bottle Unit

Module Feature

33700002 is an aerospace coded fire suppression bottle manufactured by Pacific Scientific, interchange part number 10-3275-32.

It is installed on Boeing 737 series aircraft for engine or APU fire zone extinguishing. The cylinder is made of stainless steel, pre-charged with fire suppression agent. Equipped with electric squib initiator, pressure monitoring port and discharge outlet. Activation is triggered by 18–36 VDC fire signal from aircraft fire control panel. It has fixed 10-year service life, periodic pressure inspection required. ITAR controlled item, widely stocked as aircraft MRO spare.

Working principle

When aircraft fire control system sends firing command, DC power energizes the squib cartridge.

Squib generates burst pressure to rupture the internal seal, releasing the suppression agent through discharge port into protected fire compartment. Pressure indicator monitors internal charge status continuously; pressure decay indicates leakage. Once discharged, the bottle cannot be reused and requires refill or replacement.

Onboard components

Stainless steel pressure vessel, electric squib initiator assembly, burst disc, pressure indicator gauge, discharge outlet fitting, mounting lugs and protective caps.

LED indicators

No built-in LED; status is judged by pressure gauge and aircraft fire control fault indication.

Hardware self‑diagnosis

Aircraft fire control circuit monitors squib continuity. Pressure inspection is performed by visual gauge check and periodic hydrostatic test.Programming software

Not applicable, fire squib hardwired actuation assembly.

Electrical & Process Parameters

Model:33700002 Brand:Pacific Scientific Device type:Aircraft fire suppression bottle Function:Fire suppression release for aircraft engine / APU fire zone

Mechanical & Structure

Mounting:Airframe bracket fixed installation Protection class:Sealed pressure vessel Housing:Stainless steel pressure cylinder

Environmental

Operating temperature:-53℃ ~ +93℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non‑condensing

Certification:DO-160, ITAR controlled Status:Original Boeing 737 fire protection spare

Installation

Isolate aircraft electrical power before replacement.

Secure bottle to airframe bracket, connect squib wiring, verify pressure reading, test squib loop continuity and fire command interlock after commissioning.

Interface

Squib electrical terminals, agent discharge port, pressure gauge port, airframe mounting lugs.

Diagnostic

Low pressure fault: Agent leakage, seal damage. Squib continuity alarm: Squib coil open, wiring break. Discharge fault: Burst disc premature rupture.

Product Brief33700002 bottle, Pacific Scientific aircraft fire suppression bottle spare for Boeing 737 engine fire protection replacement.