Aircraft Cabin Air

News

2019-08-22, at 11:36 local, 21:36 UTC: Hawaiian Airlines, A321neo; Emergency landing and evacuation; Smoke on board

Source: Glen Westenskow

Hawaiian Airlines (HA), Oakland (OAK) to Honolulu (HNL), Flight HA47, A321neo, N218HA landing on runway 04 right.
About 21:13: Top of Descent: Smoke starts to fill cabin i.e. when thrust setting changed (see altitude graph below).

Pilots donned their oxygen masks.

About 21:16:
- Pilots received a fire warning from the cargo compartment and released Halon into the compartment to depress the potential fire.
- "The captain declared an in-flight emergency and notified airport personnel that there may be a fire on board" said Hawaiian Airlines Chief Operating Officer Jon Snook in a media briefing.
After landing there was "no visible evidence of fire, no visible flames" said Snook.
NTSB will be notified.
"We have since determined that a seal failed in the aircraft’s left engine" said Hawaiian Airlines Alex Da Silva.
Seven passengers were taken to hospitals with smoke related symptoms.
Source: https://www.hawaiinewsnow.com
The FAA said it will investigate the incident.
Source: https://www.staradvertiser.com

Aviation Herald: Accident: Hawaiian A21N near Honolulu on Aug 22nd 2019, fumes and smoke on board prompt evacuation

Aviation Herald: Accident: British Airways A321 at Valencia on Aug 5th 2019, smoke on board

Aviation Herald: Incident: Indigo A320neo at Kolkata on Dec 10th 2018, smoke on board
Impressive Video. My Comment on Twitter and and My Contribution on Twitter to the Discussion. "The occurrence was rated a serious incident and is being investigated by the AIB", but still no report online.

Introduction

The air you breathe on an aircraft may not be as good as you had hoped for. Coming to this page, you probably know already. If is all new to you, read my German Memo or watch the English videos at the bottom of the page.

On this page:

1 Own Contributions

1.1 Papers, Presentations, Memos

1.2 Videos

2 Media Coverage (selected)
3 Action

3.1 CO Detectors
3.2 Breathing Masks

4 Student Contributions
5 Links

related to Aircraft Cabin Air Quality / Contamination.

Reach this page via http://CabinAir.ProfScholz.de

1 Own Contributions

1.1 Papers, Presentations, Memos

Author	Title	Type of Work	Delivered	No of Pages	Occasion / Purpose	Abstract	Full Text	Size
Dieter Scholz	Cabin Air Contamination – A Summary of Engineering Arguments	Presentation	18.09.19	35	International Aircraft Cabin Air Conference 2019 Imperial College London, 17 - 18 September 2019	---		2.2M
Dieter Scholz	Contaminated Aircraft Cabin Air - An Aeronautical Engineering Perspective	Presentation	27.05.19	60	Meeting 2019, Association des Victimes du Syndrome Aérotoxique (AVSA), Paris CDG Airport, France, 27.05.2019	---		3.2M
Dieter Scholz	A Quick Introduction to the Problem of Cabin Air Contamination	Presentation	12.03.19	4	Deutscher Bundestag, Berlin, 12.03.2019	---		373K
Dieter Scholz	Technical Solutions to the Problem of Contaminated Cabin Air	Presentation	05.09.18	76	Deutscher Luft- und Raumfahrtkongress 2018, Friedrichshafen (Germany), 04.-06.09.2018			4.4M
Dieter Scholz	Jet Engines – Bearings, Seals and Oil Consumption	Memo	02.04.18	22	Review to substantiate the calculation of the oil concentration in aircraft cabins			2.2M
Dieter Scholz	Cabin Air Contamination - An Aeronautical Perspective	Presentation	16.03.18	73	59. Kongress der Deutschen Gesellschaft für Pneumologie und Beatmungsmedizin e.V., Dresden (Germany), 16. März 2018			5.0M
Dieter Scholz	Belastete Kabinenluft in Flugzeugen - Flugzeugbau-Experte Dieter Scholz sieht Handlungsbedarf	Interview	06.12.17	4	Hinweis: Dies ist eine etwas vollständigere Version des Interviews als im Themendienst der HAW Hamburg vom 03.04.2018 Streichungen der Pressestelle sind hervorgehoben.	---		501K
Dieter Scholz	Aircraft Cabin Air - Quality or Contamination?	Presentation	20.11.17	48	Personalversammlung "Kabine" Deutsche Lufthansa AG Frankfurt, 20 November 2017	---		4.1M
Dieter Scholz	Die Luft in der Kabine von Passagierflugzeugen ist nicht so gut wie oft angenommen - Hintergründe, Lösungsmöglichkeiten und deren Umsetzung	Memo	01.10.17	4	Populärwissenschaftliche Darstellung und Einführung	---		329K
Dieter Scholz	Aircraft Cabin Air and Engine Oil - An Engineering View	Paper	17.09.19	6	International Aircraft Cabin Air Conference 2017 Imperial College London, 19 - 20 September 2017			767K
Dieter Scholz	Aircraft Cabin Air and Engine Oil - An Engineering View	Presentation	19.09.17	72	International Aircraft Cabin Air Conference 2017 Imperial College London, 19 - 20 September 2017			6.0M
Dieter Scholz	Aircraft Cabin Air and Engine Oil - A Systems Engineering View	Presentation	27.04.17	75	Hamburg Aerospace Lecture Series (HALS) DGLR, RAeS, VDI, ZAL, HAW Hamburg together with VC and UFO HAW Hamburg, 27 April 2017			7.2M
Dieter Scholz	Aircraft Cabin Air & Water Contamination/Quality – An Aircraft Systems Engineering Perspective	Presentation	01.04.14	46	QCAQE – Global Cabin Air Quality Executive 7th ANNUAL FORUM London, 31 March – 2 April 2014	---		37M

Presentations are based on one another - extended through the years; shortened for the audience and allocated time.

1.2 Videos

YouTube Playlist: Cabin Air (Uploads to YouTube by Prof. Scholz) Pin

YouTube Playlist: Cabin Air (Video LINKS)

englisch Presentation at the International Aircraft Cabin Air Conference 2017

deutsch Dieter Scholz im Interview bei:
ZDFzoom - Dicke Luft im Flieger (2017)
deutsch Dieter Scholz im Interview bei:
Deutschlandfunk Nova - Kabinenluft (2017)

2 Media Coverage (selected)

Piloten klagen über Gesundheitsprobleme

Schwäbische, 2018-10-22: Piloten klagen über Gesundheitsprobleme (PDF), (User=cabinair=PW)
In Web.Archive.

Die ZEIT: Gift in der Kabine?

Die ZEIT, 2017-10-19: Gift in der Kabine? (PDF), (Interview u.a. mit Prof. Scholz) (User=cabinair=PW)
Siehe auch: ZEIT ONLINE, in Web.Archive.

Sunday Times: EasyJet is First Airline to Go for Total Cabin Air Filtration

Sunday Times, 2017-09-17: Article (PDF) (User=cabinair=PW), Video.

More:
ORF2, KONKRET, 2017-09-22, 18:30: Video (Interview e.g. with Prof. Scholz).
ORF2, ZIB2, 2017-09-22, 22:00: Video (Interview e.g. with Prof. Scholz), Transcript, in Web.Archive.

EasyJet to go for Cabin Air Filtration in the Recirculation Path

Pall had announced already on 2016-12-05 (Web.Archive) that EasyJet would retrofit their fleet of A320 family aircraft with the latest Pall Aerospace PUREair Advanced Cabin Air Filters [in the recirculation].

3 Action

3.1 CO Detectors

Sensors have been demanded by pilots and cabin crew for years, but they are still not introduced on board. There may be good reasons for NOT introducing air quality sensors on passenger aircraft. However, every individual on an aircraft may decide to get informed and this can not be denied. Therefore, immediate action could be taken without waiting for the ultimate industry solution of the problem - which may never come. This is especially important in failure cases like fume events. Failures compromising cabin air quality may alert people on board, but it may need some kind of objective confirmation before action can be taken. Situations with cabin air quality problems could also pass unnoticed without sensing. If cabin air is contaminated, it will show a mixture of many substances. Carbon monoxide (CO) will most probably be one of these substances. Simple logic tells us that it is sufficient to trace one bad gas in an abnormal quantity to conclude that the cabin air is not ok. CO is taken from the cocktail to be measured, because inexpensive and small CO detectors are available on the market. Pilots (cabin crew, passengers) should read the carbon monoxide (CO) concentration from a personal CO detector as an objective indicator in addition to the observations from their senses (nose and eyes). It is known from CO measurements on the BAe 146 that the CO concentration will be low even in a fume event [1]. For this reason, the CO concentration should not be compared against the limit value of 50 ppm (CS 25.831), but rather against values obtained under normal conditions (e.g. 2 ppm; as a frequent flyer you will find out for yourself soon).

[1] Global Cabin Air Quality Executive: Carbon Monoxide Database Collated on 345 BAe 146 Flights in UK, 2003-2004, 2006 (access difficult, but contact GCAQE for more information if you are desperate)

Feel free to report/share your findings. E.g. take a picture of your CO detector with its reading (maybe with a fume filled cabin in the background) and report about what happened to people during that flight. We may all learn from this collected information.

I have expressed the above view in my presentations and have been asked where inexpensive(!) CO detectors can be bought. Looking on the Internet myself, I discovered these links:

Inexpensive Instant CO Sensors:
UYIGAO UA6070 CO Detector (identical to KXL-801) --- Features: loud alarm
KXL-801 CO Detector (identical to UYIGAO UA6070) --- Video Test
KKmoon GM8805 CO Detector --- Features: data hold, alarm threshold can be set. Video Test. Manual (PDF)
AS8700A CO Detector --- Features: data hold
HT-530 CO Detector --- Features: clip to attach to clothes
KXL-601 Mini CO Detector (low budget device) --- User report: "very inaccurate", "not recommended"

Remark:

Not considered to be an alarm/safety/warning device
Battery about 100 hours service life
Operating pressure unkown
These very affordable CO detectors are offered by Chinese wholesale and retail online shops e.g. TOMTOP and Banggood. You can find mixed online reviews about both shops. I have no stakes in these sales. You purchase at your own risk.
The main disadvantage of these inexpensive products is that they will automatically shut off if they are not operated for 10 minutes. This is necessary, because the batteries will not last sufficiently long otherwise. The holder has to check the air for CO at regular intervals or when being suspicious.
Do not worry about a loud alarm on your CO detector going off. The CO concentration in the cabin is much lower than the typical fixed threshold of 50 ppm. Some sensors even allow setting the threshold. In the very unlikely event where the alarm is triggered, you should be thankful for it!

Affordable CO Datalogger:
Lascar Electronics EL-USB-CO300 Carbon Monoxide Datalogger

Remark:

Not considered to be an alarm/safety/warning device
3 month logging life (data storage & battery)
Operating pressure range 900 hPa ... 1100 hPa (up to 3300 ft cabin altitude; required would be 8000 ft or 750 hPa)
It is left to the user to set the light and sound alarms indicating the presence of CO
Device with USB interface and PC software for data visualization
EL-USB-CO300: ±5ppm / ±4% (whichever is greater); EL-USB-CO: ±7ppm / ±6% (whichever is greater); => select EL-USB-CO300

3.2 Breathing Masks

Each member of the cockpit crew is protected by one onboard oxygen mask. Oxygen comes from a bottle and is available for the rest of the flight. Cabin crew have (at best) a smoke hood for their protection. The chemical oxygen supply in the smoke hood is intended only for short duration. A private breathing mask can protect people in the cabin in the very rare event of air contamination. A breathing mask filters the air and will do so for the rest of the flight. Inexpensive are the army standard breathing masks. Buy only new masks. Germany: "Bundeswehr Schutzmaske M65" (by Dräger). Better suited is a civil mask like the "Dräger X-plore 6300 Full Mask". It has a standardized 40 mm threaded filter connection. A suitable filter would be the "Dräger X-plore A2B2E2K2HGP3". This is a "combined filter" for "organic gases and vapours" (A), "inorganic gases and vapours" (B), and other substances.

Also this information is provided here; because I have been ask for it. Cabin crew members are increasingly concerned. Some already have a personal breathing mask in their carry-on baggage or intend to do so. By asking cabin crew members to consider to carry a breathing mask (in order to be prepared for a very unlikely event), I do NOT state that cabin air can be compared to the air after an attack with chemical weapons. What I argue is only this: A breathing mask (with a suitable filter) will protect people in "harsh environments". I do NOT consider the aircraft cabin such a "harsh environment". Therefore, a breathing mask will give sufficient protection in such cases where people have (claimed to) become ill in the aircraft cabin due to (potentially) contaminated cabin air. Employers have a legal duty to protect their employees. If employers do not act accordingly, cabin crew have the right to take measures themselves as deemed necessary.

4 Student Contributions

Author	University	Title	Type of Work	Delivered	No of Pages	Full Text	Size
Marcel Lakies	HAW Hamburg	Dynamic Cabin Air Contamination Calculation Theory	Project	01.03.19	84		3.2M
Viola Voth	TU Braunschweig	Analyse der Entstehungsmechanismen von Ölnebel in Flugzeugkabinen	Bachelorarbeit	17.07.18	116		11M