Table 4 Study results summary
From: Ultrafine particle levels measured on board short-haul commercial passenger jet aircraft
Flight | Maximum UFP count (000)/cm3/ phase of flight | Secondary peak and phase of flight | Age of aircraft | Potential maximum age of engine | Oil smell detected |
|---|---|---|---|---|---|
Flight 1 | 96.7 – APU selected on after landing | 37.6 After the introduction of engine bleed air after a reduced power takeoff | 6 months | 2 years | Yes – APU selected on after landing |
Flight 2 | 31.3 – After the introduction of engine bleed air after a reduced power takeoff | 21.1 Introduction of APU bleed air prior to engine start | 3.5 years | 22 years | No |
Flight 3 | 81.8—APU selected on after landing | 26.3 Climb power reapplied after level off during climb | 12 years | 21 years | Yes – APU selected on after landing |
Flight 4 | 97.8 – After the introduction of engine bleed air after a full power takeoff | 81.5 After 1st pack selected on after takeoff | 14 years | 21 years | No |