TBL ENR 1.7.3
ICAO COLD TEMPERATURE ERROR TABLE
Height Above Airport in Feet
Reported Temp .C
200 300 400 500 600 700 800 900 1000 1500 2000 3000 4000 5000
+10 10 10 10 10 20 20 20 20 20 30 40 60 80 90
0 20 20 30 30 40 40 50 50 60 90 120 170 230 280
.10 20 30 40 50 60 70 80 90 100 150 200 290 390 490
.20 30 50 60 70 90 100 120 130 140 210 280 420 570 710
.30 40 60 80 100 120 140 150 170 190 280 380 570 760 950
.40 50 80 100 120 150 170 190 220 240 360 480 720 970 1210
.50 60 90 120 150 180 210 240 270 300 450 590 890 1190 1500
EXAMPLE.
Temperature.10 degrees Celsius, and the aircraft altitude is 1,000 feet above the airport elevation. The chart shows that the reported current altimeter setting may place the aircraft as much as 100 feet below the altitude indicated by the altimeter.
Federal Aviation Administration Twentieth Edition
4. High Barometric Pressure
4.1 Cold, dry air masses may produce barometric pressures in excess of 31.00 inches of Mercury, and many altimeters do not have an accurate means of being adjusted for settings of these levels. As noted in paragraph 3.2, when the altimeter cannot be set to the higher pressure setting, the aircraft actual altitude will be higher than the altimeter indicates.
4.2 When the barometric pressure exceeds
31.00 inches, air traffic controllers will issue the actual altimeter setting, and:
4.2.1 En Route/Arrivals. Advise pilots to remain set on 31.00 inches until reaching the final approach segment.
4.2.2 Departures. Advise pilots to set 31.00 inches prior to reaching any mandatory/crossing altitude or 1,500 feet, whichever is lower.
4.3
The altimeter error caused by the high pressure will be in the opposite direction to the error caused by the cold temperature.
5.
Low Barometric Pressure
5.1 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.
ENR 1.8 [RESERVED]
Federal Aviation Administration Twentieth Edition
ENR 1.9 [RESERVED]
Federal Aviation Administration Twentieth Edition
ENR 1.10 Flight Planning
(Restriction, Limitation or Advisory Information)
1. Preflight Preparation
1.1 Every pilot is urged to receive a preflight briefing and to file a flight plan. This briefing should consist of the latest or most current weather, airport, and en route NAVAID information. Briefing service may be obtained from a flight service station (FSS) either by telephone or interphone, by radio when airborne, or by a personal visit to the station. In the 48 contiguous States, pilots with a current FAA medical certificate may access toll.free the Direct User Access Terminal System (DUATS) through a personal computer. DUATS will provide alpha.nu-meric preflight weather data and allow pilots to file domestic VFR and IFR flight plans.
REFERENCE.
GEN 3.5, paragraph 3.5.3.3 lists DUATS vendors.
NOTE.
Pilots filing flight plans via “fast file” who desire to have their briefing recorded, should include a statement at the end of the recording as to the source of their weather briefing.
1.2 The information required by the FAA to process flight plans is contained on FAA Form 7233.1, Flight Plan. The forms are available at all flight service stations.
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