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Flammability Reduction Compliance Status

Update on Flammability assessments, N2 systems on Boeing & Airbus, FAA Compliance, ELOS policy, and proactive measures for Fuel Tank Flammability- ongoing monitoring and future precautions. Stay informed for safety.

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Flammability Reduction Compliance Status

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  1. Flammability Reduction Compliance Status Fuel Tank Flammability

  2. Design Approval Holders- • Flammability assessments completed by all DAH (EMB, Fokker, Bombardier, ATR, Shorts, Airbus, Boeing). • No additional fuel tanks identified as exceeding the high flammability limit. • Retrofit: Boeing and Airbus completed all flammability assessments, compliance planning, design development. Service instructions expected to be submitted to FAA by December 26, 2010 date. • Production Incorporation on 777 and 737. Three A320 airplanes delivered to date in US with system installed. Conducting in- service evaluation. • Over 800 737NG and 50 777 delivered worldwide to date with nitrogen inerting systems. Reliability has exceeded predictions. • 787 and A350 have active inerting systems for all fuel.

  3. Deviation/Equivalent Level of Safety Policy • FAA required standardized airplane descent rate to be used in assessing fuel tank flammability using Monte Carlo Model. • Descent rate strongly influences sizing of inerting systems • intake of outside air into fuel tanks because of pressure change • reduced production of nitrogen when engine set to idle and available engine bleeds lowered. • Boeing requested an Equivalent Level of Safety (ELOS) Finding using a descent rate that more accurately represented in service operations.

  4. Descent Rate ELOS • FAA agreed to ELOS but required Boeing to: • monitor in service descent rates and report every 3 years to FAA. • Develop service instructions to maintain flammability within certified limits if the fleet flammability approaches the limit. • Future changes to the air traffic system currently being implemented are envisioned to result in more rapid descent rates and therefore the possibility of increased fleet average fuel tank flammability. • Include a Design Configuration Control Limitation that requires operators to incorporate any changes needed to maintain the flammability within limits.

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