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in millibars, just how few millibars
can come as a surprise:
- “Altimeter setting 971 mb [descending]
out of 4,000 feet (transition altitude)
…started to set altimeter. By the time I had
set 971 mb, I was 500 feet below assigned
altitude. Approach Control noticed what
had happened and cleared us to 2,000
feet…and said, ‘Altimeter setting is pretty
low, huh!’ Never having used millibars before,
the significance of 971 mb wasn’t apparent
to me until I read the inches of mercury
equivalent, 28.68.” (#101698)
Pass your Bar Exam in foreign countries;
be particularly vigilant where altimeter
settings may be in units other
than inches of mercury, and where altimeter
transition levels, from pressure
altitude (QNH) to the standard pressure
setting of 29.92 (QNE), and viceversa,
may be variable.
Feeling Pressured?
Other reporters confessed to simple
human error-mistakes in reading,
hearing, or copying the broadcast altimeter
setting; distractions and inattention;
and failure to complete
checklists.
- “The 30.06 altimeter setting we used
was actually the wind speed and direction
and was written [on the ATIS information
card as] 3006. In my mind, this was a
reasonable altimeter setting. The ATIS
setting was actually 29.54.” (#292949)
- “PNF understood ATIS recording to
state altimeter setting to be 29.99 when
actually the setting was 29.29.” (#293372)
- “First flight of the day after overnight
maintenance…and there was adequate
time to accomplish all required checks.
Maintenance had set the Captain’s altimeter
to zero. Departure field elevation was
almost exactly 1,000 feet MSL. This was
a very subtle trap, but we had a lot of
chances to catch it.” (#300270)
Even with what appeared to be a
clear reminder for the flight crew, this
Second Officer reports that they all
still missed the “heads-up:”
- “The altimeter was 28.84. I remember
enlarging the 8’s with two circles on
top of each other, thinking this would be
sufficient in drawing attention to the low
altimeter setting. The next crew after our
flight…found the altimeter to be set at
29.84 instead of the actual 28.84 setting.”
(#195014)
Take the Pressure off by applying
solid CRM skills. Keep all crew in the
loop and confirm communications
(verbal and written) with each other.
ATC’s Role
A number of reporters expressed
concern that ATC had “failed” to warn
the flight crews about unusually low
altimeter settings. However, misconceptions
abound regarding ATC or FSS
personnel’s responsibility during low
pressure situations. Two report excerpts
illustrate:
- “ATIS [reported altimeter] 28.84. No
mention of low altimeter was made.
[Climbing through] FL180, altimeters
were set to 28.92 Captain and 29.92
First Officer. At FL320 Captain’s altimeter,
I called FL320 for 330. The First Officer
called 330, noticing the wrong altimeter
setting on my side. I immediately
descended…while setting my altimeter to
29.92. I feel this mistake might have
been avoided if the ATIS had mentioned
the low altimeter setting.” (#290458)
In recording the ATIS, some controllers
may emphasize the altimeter setting
by stating, for example, “a low
28.84.” However, this procedure is not
mandatory.
Issue Number 9 9
- “Destination weather [reported altimeter]
28.83. Prior to initial descent, the
Second Officer received and put the ATIS
information on the landing bug card, except
that the altimeter was written as
29.83… [On final], the Captain started a
go-around at the same time the Tower reported
they had a low altitude alert warning
from us… I feel anytime [the altimeter
setting] is below 29.00, the term
‘low/low’ should be used.” (#290848)
Again, there is no requirement for
controllers to notify pilots of unusually
low barometric conditions, although
many controllers elect to do
so. The phrasing “low/low” is a technique
used by some controllers and
Flight Service Station specialists to emphasize
a particularly low altimeter
setting, but pilots shouldn’t count on
hearing it.
As little as a year ago, the FAA Air
Traffic Procedures Division again
looked into the suggestion that controllers
state the word “low” before issuing
　
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