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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.
EXAMPLE−
Destination 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 or minimum descent altitude shall be
deemed to have been reached when the published
altitude is displayed on the altimeter.
NOTE−
Although visibility is normally the limiting factor on an
approach, pilots should be aware that when reaching DH
the aircraft will be higher than indicated. Using the
example above the aircraft would be approximately
300feet higher.
3)These restrictions do not apply to authorized
Category II and III ILS operations nor do they apply
to certificate holders using approved QFE altimetry
systems.
2.1.1.3The FAA Regional Flight Standards Division
Manager of the affected area is authorized to approve
temporary waivers to permit emergency resupply or
emergency medical service operation.
2.1.2At or above 18,000 feet MSL:to 29.92 Hg
(standard setting). The lowest usable flight level is
determined by the atmospheric pressure in the area of
operation, as shown in TBL ENR 1.7−1.
TBL ENR 1.7−1
Lowest Usable Flight Level
Altimeter Setting
(Current Reported)
Lowest Usable
Flight Level
29.92 or higher 180
29.91 to 29.42 185
29.41 to 28.92 190
28.91 to 28.42 195
28.41 to 27.92 200
2.1.3Where the minimum altitude, as prescribed in
14 CFR Sections 91.159 and 91.119, is above
18,000feet MSL the lowest usable flight level shall
be the flight level equivalent of the minimum altitude
plus the number of feet specified in TBL ENR 1.7−2.
TBL ENR 1.7−2
Lowest Flight Level Correction Factor
Altimeter Setting Correction Factor
29.92 or higher none
29.91 to 29.42 500 feet
29.41 to 28.92 1000 feet
28.91 to 28.42 1500 feet
28.41 to 27.92 2000 feet
27.91 to 27.42 2500 feet
EXAMPLE−
The minimum safe altitude of a route is 19,000 feet MSL
and the altimeter setting is reported between 29.92 and
29.42 inches of mercury. The lowest usable flight level will
be 195, which is the flight level equivalent of 19,500 feet
MSL (minimum altitude plus 500 feet).
2.1.4Aircraft operating in an offshore CONTROL
AREA should use altimeter setting procedures as
described above, unless directed otherwise by ATC.
NOTE−
Aircraft exiting the oceanic CTA/FIR destined for the U.S.
or transitioning through U.S. offshore control areas should
use the current reported altimeter of a station nearest to the
route being flown. When entering an oceanic CTA/FIR
from U.S. offshore control areas, pilots should change to
the standard altimeter setting 29.92.
3. Altimeter Errors
3.1Most pressure altimeters are subject to mechanical,
elastic, temperature, and installation errors.
(Detailed information regarding the use of pressure
altimeters is found in the Instrument Flying
Handbook, Chapter IV.) Although manufacturing
and installation specification, as well as the periodic
test and inspections required by regulations (14 CFR
Part 43, Appendix E), act to reduce these errors−−any
scale error may be observed in the following manner:
3.1.1Set the current reported altimeter setting on the
altimeter setting scale.
3.1.2Altimeter should now read field elevation if
you are located on the same reference level used to
establish the altimeter setting.
3.1.3Note the variation between the known field
elevation and the altimeter indication. If this variation
is in the order of plus or minus 75 feet, the accuracy
of the altimeter is questionable and the problem
should be referred to an appropriately rated repair
station for evaluation and possible correction.
AIP ENR 1.7−3
United States of America 15 MAR 07
Federal Aviation Administration Nineteenth Edition
3.2Once in flight, it is very important to obtain
frequently current altimeter settings en route. If you
do not reset your altimeter when flying from an area
of high pressure into an area of low pressure, your
aircraft will be closer to the surface than your
altimeter indicates. An inch error in the altimeter
setting equals 1,000 feet of altitude. To quote an old
　
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