FAA

EASA

Regulation/standard

CFR 14 33.75 - Safety analysis - Engines

1. Hazardous engine effects -

・ Extremely remote

・ 10⁻⁷ to 10⁻⁹/efh

・ Concentration of toxic products in engine bleed air intended for the cabin sufficient to incapacitate crew or passengers.

2. Major engine effects

・ Remote

・ 10⁻⁵ to 10⁻⁷/efh

CS-E 510 & CS-APU 210 - Safety analysis - Engines & APU

1. Hazardous engine/APU effects

・ Extremely remote

・ <10⁻⁷/efh or APU operating hour (APU o/h)

・ Concentration of toxic products in engine/APU bleed air intended for the cabin sufficient to incapacitate crew or passengers

2.Major engine effects

・ Remote

・ <10⁻⁵/efh or APU o/h

Safety analysis: must include compressor bleed systems

Guidance Material (FAA Advisory Circular-EASA CS AMC)

FAA - AC 33.75-1A (engines)/CS AMC E 510 & CS - APU 210 (engines & APU)

1. Hazardous Engine effects: Toxic products:

・ Generation and delivery of toxic products caused by abnormal engine operation sufficient to incapacitate crew or passengers during flight.

・ Degradation of oil leaking into compressor airflow.

Intent is to address relative concentration of toxic products in bleed air delivery. No assumptions including cabin air mixing/dilution.

2. Major engine effects:

・ Concentration of toxic products in engine/APU bleed air for the cabin sufficient to degrade crew performance.