Type training · Boeing 737NG B1.1 · ATA 21
Boeing 737NG B1.1: Air Conditioning and Pressurization (ATA 21)Type training questions & answers
Ozone converters, packs and ram air, zone temperature and trim air, recirculation, equipment cooling and the digital cabin pressure control.
- A worked explanation on every question
- Written for the 737-600/700/800/900
- Read in English or 15 other languages
Sample Air Conditioning and Pressurization questions with answers
Three questions from the free preview. Think of your answer first, then open the explanation.
1.Why does the 737NG have ozone converters?
- A.To cool the bleed air further
- B.To remove fuel vapour from the air
- C.Remove ozone on high flights
Show answer and explanation
Correct answer: C. Remove ozone on high flights
For long periods above 26,000 ft ozone must be removed from the fresh air supply. Ref Boeing 737-600/700/800/900 training manual, ATA 21.
2.About how much cabin air does the 737NG recirculation system reuse?
- A.About 50%
- B.About 10% of the total flow
- C.About 90% of the total flow
Show answer and explanation
Correct answer: A. About 50%
The recirculation system recycles about 50% of cabin air and reduces bleed air use. Ref Boeing 737NG training manual, ATA 21.
3.What filter does the 737NG recirculation fan draw air through?
- A.HEPA filter
- B.A simple foam pre-filter only
- C.A charcoal odour filter only
Show answer and explanation
Correct answer: A. HEPA filter
Air passes a HEPA filter that removes particles down to bacteria and microorganism level. Ref Boeing 737NG training manual, ATA 21.
Part of the Boeing 737NG B1.1 airframe and systems course
One chapter of the Boeing 737NG B1.1 airframe and systems course question bank, for the 737-600/700/800/900, written in our own words for revision. Your type course and the aircraft maintenance manual stay the authority: limits and procedures can differ between airframes and operators.
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