Airport Aircraft Hangar: NFPA 409 AFFF Deluge, Group I-II-III and 60-Second Activation

Hangars protect 300,000+ L jet-fuelled aircraft. A fuel spill fire develops in 60 seconds and aluminium structure collapses in 5 minutes. NFPA 409 classifies hangars as Group I (large widebody), Group II (narrowbody), Group III (GA) and mandates AFFF / high-expansion foam.

Hangar Classification

• Group I: >2800 m2, B747/A380
• Group II: 1115-2800 m2, A320/B737
• Group III: <1115 m2, business jet
• Group IV: Membrane hangar
• Group V: Military specialty

Group I AFFF Deluge

• Overhead: 6.5 L/min/m2 (0.16 gpm/sqft)
• Low-level: 10.2 L/min/m2 under aircraft
• Duration: 10 min overhead + 10 min low
• AFFF 3 percent: F3 fluorine-free transition
• Activation: Full system within 60 s

High-Expansion Foam

• Expansion: 500:1-1000:1 volume
• Application: 1 m/min rise
• Area: Hangar fill 2-3 m depth
• Generator: Electric + air
• Benefit: Water saving, 3D fill

Detection and Alarm

• Optical smoke: Beam 100 m range
• UV/IR flame: 30 m dia
• Heat detector: Rate-of-rise
• Manual: Pull station 30 m spacing
• Voice alarm: Evacuation announcement

Turkish Hangar Examples

• Istanbul Airport THY: 8 hangars Group I
• Sabiha Gokcen MRO: Pegasus maintenance
• Esenboga Havelsan: Military Group V
• Kayseri TAI: F-16 production
• Izmir Cigli: Turkish Air Force

Hangars with SprinkCalc

SprinkCalc sizes hangar Group I-II-III AFFF overhead 6.5 L/min/m2, low-level 10.2 L/min/m2, high-expansion foam fill and NFPA 409 layout.

Download SprinkCalc on the App Store