Too low air pressure to fly
Thread Starter
Joined: May 2016
Posts: 4
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From: Norway
Too low air pressure to fly
Norwegian Carrier Widerøe has had to cancel several flights in the northern part of Norway today due to air pressure being below 946 hPa - which apparently is the certification limit for some of their aircraft (WF fleet consists mainly of DHC-8 variants).
Not a very common occurrence....
Unfortunately I'm not allowed to post URLs or pictures yet, but you can find the story at the website of the Norwegian national broadcaster NRK (.no).
Not a very common occurrence....
Unfortunately I'm not allowed to post URLs or pictures yet, but you can find the story at the website of the Norwegian national broadcaster NRK (.no).
Joined: Oct 2000
Posts: 15
Likes: 0
From: Closest airport OSL and TRF
Joined: Jun 2002
Posts: 2,108
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From: Geneva, Switzerland
Joined: Apr 2013
Posts: 100
Likes: 122
From: UK
Reminds me of a particularly long and boring flight a while back where I was finding out what the lowest QNH you can forecast on the 737 FMC by trial and error - not that I can remember the number anymore! Like I said, was very bored.
Joined: May 2005
Posts: 1,198
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From: France
Joined: Jun 2001
Posts: 480
Likes: 27
From: at the edge of the alps
You'd need a QNE minimum as well.
FAA AIM recommends not to operate when you can't adjust to low pressure (and once more impressed by how the FAA manages to produce useful information in readable form, an art totally lost to EASA).7.5.2 Low Barometric Pressure
When abnormally low barometric pressure conditions occur (below 28.00), flight operations by aircraft unable to set the actual altimeter setting are not recommended.
NOTE-
The true altitude of the aircraft is lower than the indicated altitude if the pilot is unable to set the actual altimeter setting.
FAA AIM recommends not to operate when you can't adjust to low pressure (and once more impressed by how the FAA manages to produce useful information in readable form, an art totally lost to EASA).7.5.2 Low Barometric Pressure
When abnormally low barometric pressure conditions occur (below 28.00), flight operations by aircraft unable to set the actual altimeter setting are not recommended.
NOTE-
The true altitude of the aircraft is lower than the indicated altitude if the pilot is unable to set the actual altimeter setting.
