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4. Instrument error.
b. EXTREME CAUTION SHOULD BE EXERCISED
WHEN FLYING IN PROXIMITY TO
OBSTRUCTIONS OR TERRAIN IN LOW TEMPERATURES
AND PRESSURES. This is especially
true in extremely cold temperatures that cause a large
differential between the Standard Day temperature
and actual temperature. This circumstance can cause
serious errors that result in the aircraft being
significantly lower than the indicated altitude.
NOTEStandard
temperature at sea level is 15 degrees Celsius
(59degrees Fahrenheit). The temperature gradient from
sea level is minus 2 degrees Celsius (3.6 degrees
Fahrenheit) per 1,000 feet. Pilots should apply corrections
for static pressure systems and/or instruments, if
appreciable errors exist.
c. The adoption of a standard altimeter setting at
the higher altitudes eliminates station barometer
errors, some altimeter instrument errors, and errors
caused by altimeter settings derived from different
geographical sources.
7-2-2. Procedures
The cruising altitude or flight level of aircraft shall be
maintained by reference to an altimeter which shall
be set, when operating:
a. Below 18,000 feet MSL.
1. When the barometric pressure is
31.00inches Hg. or less. To the current reported
altimeter setting of a station along the route and
within 100 NM of the aircraft, or if there is no station
within this area, the current reported altimeter setting
of an appropriate available station. When an aircraft
is en route on an instrument flight plan, air traffic
controllers will furnish this information to the pilot at
least once while the aircraft is in the controllers area
of jurisdiction. In the case of an aircraft not equipped
with a radio, set to the elevation of the departure
airport or use an appropriate altimeter setting
available prior to departure.
2. When the barometric pressure exceeds
31.00 inches Hg. The following procedures will be
placed in effect by NOTAM defining the geographic
area affected:
(a) For all aircraft. Set 31.00 inches for en
route operations below 18,000 feet MSL. Maintain
this setting until beyond the affected area or until
reaching final approach segment. At the beginning of
the final approach segment, the current altimeter
setting will be set, if possible. If not possible,
31.00inches will remain set throughout the approach.
Aircraft on departure or missed approach will
set 31.00 inches prior to reaching any mandatory/
crossing altitude or 1,500 feet AGL, whichever is
lower. (Air traffic control will issue actual altimeter
settings and advise pilots to set 31.00 inches in their
altimeters for en route operations below 18,000 feet
MSL in affected areas.)
(b) During preflight, barometric altimeters
shall be checked for normal operation to the extent
possible.
(c) For aircraft with the capability of setting
the current altimeter setting and operating into
airports with the capability of measuring the current
altimeter setting, no additional restrictions apply.
(d) For aircraft operating VFR, there are no
additional restrictions, however, extra diligence in
flight planning and in operating in these conditions is
essential.
(e) Airports unable to accurately measure
barometric pressures above 31.00 inches of Hg. will
report the barometric pressure as “missing” or “in
excess of 31.00 inches of Hg.” Flight operations to
and from those airports are restricted to VFR weather
conditions.
AIM 2/14/08
7-2-2 Altimeter Setting Procedures
(f) For aircraft operating IFR and unable to set
the current altimeter setting, the following restrictions
apply:
(1) To determine the suitability of departure
alternate airports, destination airports, and
destination alternate airports, increase ceiling
requirements by 100 feet and visibility requirements
by 1/4 statute mile for each 1/10 of an inch of Hg., or
any portion thereof, over 31.00 inches. These
adjusted values are then applied in accordance with
the requirements of the applicable operating
regulations and operations specifications.
EXAMPLEDestination
altimeter is 31.28 inches, ILS DH 250 feet
(200-1/2 ). When flight planning, add 300-3/4 to the
weather requirements which would become 500-11/4.
(2) On approach, 31.00 inches will remain
set. Decision height (DH) or minimum descent
altitude shall be deemed to have been reached when
the published altitude is displayed on the altimeter.
NOTEAlthough
visibility is normally the limiting factor on an
approach, pilots should be aware that when reaching DH
　
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