3 OFFs | ||
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Bearing Off, Distance Off, Time Off A method of checking leg tracking and timing at the mid leg check point during navigation BEARING OFF - At your mid leg check point assess your location compared to the check point and estimate the difference in bearing from the start waypoint. DISTANCE OFF - Estimate the Distance Off of track using the 1 in 60 Rule. TIME OFF - Note hoe the time abeam the check point compares to the planned time From these three Offs the aircraft can be flown back onto track or flown directly to the end leg waypoint. Also an assessment of the time of arrival at the leg end waypoint can be made or the aircraft speed changed to maintain a time over the waypoint. | ||
AI | ||
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Attitude Indicator The main instrument of understanding the aircraft‘s attitude with respect to earth’s surface. It is a gyro (or graphical representation) driven by either:
It is normally mounted centrally on an aircraft main instrument panel. It can be implemented as graphics within a “glass cockpit”. Further Information: Wikipedia | ||
APT | ||
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Attitude, Power, Trim A method specifically for levelling off from a climb. ATTITUDE - Pitch from the Climb attitude to the Straight and Level attitude expected for the required speed. POWER - Adjust the throttle to provide the expected power required for the desired speed. TRIM - Trim the aircraft in pitch to minimise stick forces so the aircraft maintain the chosen attitude wits minimal input from you. See also: PAAT | ||
Artificial Horizon | ||
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The main instrument of understanding the aircraft‘s attitude with respect to earth’s surface. It is a gyro (or graphical representation) driven by either:
It is normally mounted centrally on an aircraft main instrument panel. It can be implemented as graphics within a “glass Cockpit”. Further Information: Wikipedia | ||
Bingo | ||
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Bingo Fuel The fuel required to fly directly back to base in a straight line. | ||
Charlie | ||
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Charlie Time The planned landing time on a vessel. Often also used for landing ashore. Usually the expected end of the sortie. | ||
Chicken | ||
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Chicken Fuel The minimum fuel required to continue the route as planned. | ||
Clock Code | ||
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Clock Code This has two meanings depending upon its application. Lookout - When applied to Lookout, Clock Code is a method of identifying an azimuth direction from the aircraft. Directions from the aircraft begin from 12 O’clock being directly ahead with 6 O’clock being directly astern. E.g. 4 O’clock indicates a direction past the abeam on the right side of the aircraft. Drift - When applied to Drift, Clock Code is a method of mental arithmetic to estimate the Sin() function. The difference between the wind direction and the aircraft‘s flight path is compared to minutes of a clock. The resulting potion of the hour is the portion of Max Drift to be used to estimate the angular correction to make to offset the aircraft‘s heading and so allow for drift, thus keeping the aircraft on track. E.g. 30˚ implies 30 minutes which is half an hour and so half the Max Drift should be applied towards the wind for the aircraft to maintain the desired track. | ||
HAT | ||
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Heading, Altitude, Time A method of conducting a turn at a waypoint during navigation. This occurs twice, Before the turning point is the Pre-HAT and after the turning point is the Post-HAT Pre-HAT HEADING - Having seen the turning point (or planning to turn on time) Check the next heading from your navigation plan. Adjust this heading for drift using Max Drift and Clock Code. ALTITUDE - Check if there is a required change of altitude for the next leg and the associated Safety Altitude. TIME - If running individual leg timing, reset the clock. If running continuous timing for the route, note the time at the waypoint. At the waypoint, Restart the clock (if required), Lookout and Turn.... JUST Lookout and Turn until rolling out on heading. Do NOTHING else. Post-HAT HEADING - After rolling out, check you have rolled out on your wind adjusted heading. ALTITUDE - Adjust your altitude for the next leg. TIME - Ensure the clock is running or if you forgot to note the time at the waypoint take the time now and add a few second for the turn.
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HLT | ||
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LAI | ||
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Lookout, Attitude, Instruments A method of maintaining a good Lookout whilst ensuring the aircraft maintain the desired altitude, heading and speed. LOOKOUT - This is completed in two stages, beginning with the Right hemisphere. Look as deep into your 5 o’clock as you can and scan fully up and down whilst progressing you Lookout back to the ahead. ATTITUDE - Whilst looking ahead assess you aircraft‘s attitude to the horizon. Ensure it remain where you desired. INSTRUMENTS - Check that this attitude is maintain your chosen flight path by checking the instruments:
See also: SHT for a method of correcting errors | ||
Max Drift | ||
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Max Drift A method of assessing the effect of wind on the aircraft drift from track. MAX DRIFT - The maximum drift an aircraft will suffer from a wind directly abeam the flight path. This is estimated by taking the windspeed and dividing it by the aircraft’s speed in nm / minute. E.g. An aircraft flying at 240 kts is covering 4 nm / minute. With a wind from directly abeam with a speed of 20 kts the aircraft will suffer a drift of 5˚. 20 / 4 = 5 See also: Clock Code | ||
NAVEX | ||
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Navigation Exercise A flight primarily aimed at exercising navigation skills | ||
OAT | ||
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Outside Air Temperature The temperature of the air around the aircraft. Low temperature causes the air to be more dense and so appear as if the aircraft is flying lower when assessed on a Barometric Altimeter. Average Air Temperature at sea level for the ICAO Standard Atmosphere is 15° Wiki: Outside Air Temperature | ||