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Pilot Measures against Cabin Air Contamination

by: Stichternath, Lukas

Publication date: 2021-02-03

Usage: Attribution-NonCommercial-ShareAlike 4.0 International

Publisher: Aircraft Design and Systems Group (AERO), Department of Automotive and Aeronautical Engineering, Hamburg University of Applied Sciences

Collection: opensource

Contributor: Scholz, Dieter

Language: English

Rights: © This work is protected by copyright. The work is licensed under CC BY-NC-SA. Any further request may be directed to Prof. Dr.-Ing. Dieter Scholz, MSME (http://www.ProfScholz.de)

Purpose – This thesis tries to improve the situation of pilots in a Cabin Air Contamination Event (CACE) by increasing awareness through added information. Pilot activities in a CACE

center around getting information about the level of contamination, applying checklists, and troubleshooting procedures, and if necessary, descending to 10000 ft.

Methodology – Starting from the results of previous work at HAW Hamburg information available on the Internet was reviewed. Information from manuals available to pilots was added

from own sources or also discovered on the Internet.

Findings – Sensors are necessary to help pilots to identify a CACE. Handheld sensors can beused without any delay today. Fixed sensors placed at various positions in the

air conditioning system yield earlier warning and allow better trouble shooting. Suitable markers like formaldehyde have been identified. Suitable sensors are available. An electrical nose can

recognize a pattern of substances and can distinguish e.g. engine oil from hydraulic fluid contamination. Although checklists dedicated to CACEs could guide pilots much better, if

circumstances and the known smell already indicate a bleed air related problem, few airlines seem to use dedicated CACE related checklists. If a fire on board can be ruled out, descending

to 10000 ft for direct cabin ventilation and cruise to the next alternate can prevent damage to passenger and crew health from otherwise continued flight at altitude with contaminated cabin air.

Research limitations – The investigation is based on a limited number of emergency checklists. Information is limited about sensors of marker substances for cabin air contamination.

Practical implications – Knowledge about CACEs can help pilots to make a better suited informed decision rather than following a smoke checklist blindly. Pilots are given hints what type of

sensors to buy. A suitable sensor adds further to making an informed decision in a CACE.

Originality – This seems to be the first scientific discussion of pilot measures in a CACE.