In aviation, the rule of three or "3:1 rule of descent" is a rule of thumb that 3 nautical miles (5.6 km) of travel should be allowed for every 1,000 feet (300 m) of descent.
It's called the 3-2-1 rule, and it's the easiest way to remember the regulation. To recap, if the weather at your destination isn't at least 3 SM of visibility and 2000' AGL ceilings from 1 hour before to 1 hour after your ETA, you need to file an alternate.
For larger aircraft, typically people use some form of the 3/6 Rule: 3 times the altitude (in thousands of feet) you have to lose is the distance back to start the descent; 6 times your groundspeed is your descent rate.
Rate of Descent on Final Approach
For a 3 degree glideslope, required rate of descent in feet per minute is approximately equal to ground speed in knots multiplied by 5.
Option 1: Multiply Your Groundspeed By 5
If you're flying your aircraft on a roughly 3-degree glideslope, try multiplying your groundspeed by 5 to estimate your descent rate. The result will be a FPM value for descent that you should target. As you capture the glideslope, make adjustments as necessary.
One per cent rule:
point of landing must be less than one per cent of the total distance flown.
That's why pilots are taught the 1 in 60 rule, which states that after 60 miles, a one-degree error in heading will result in straying off course by one mile. Which means the lake you planned to fly over could turn out to be a mountain.
For a 3-degree glide slope, there is a 300 ft per nautical mile increase in altitude. So, for example, if the aircraft is at 5 NM, the altitude of the aircraft must be (300 x 5) = 1,500 ft. This simple calculation can be used to determine if the aircraft is on the correct glide slope.
A glideslope is a vertical path that directs the airplane to the touch down zone of the runway. Standard gradient is 20:1, which is 5% or 3 degrees. This allows for the airplane to fly a stabilized approach and make a safe landing.
The 80:20 rule means airlines need to use their take-off slots at least 80% of the time in order to retain them. A "justified non-use provision" will be retained to prevent airlines flying ghost flights.
The Twelve-Five Standard Security Program (TFSSP) outlines requirements for FAA Part 135 certificated carriers offering commercial air transport using aircraft with a maximum certificated takeoff weight between 12,500 pounds (5,670 kg) and 100,309.3 pounds (45,500 kg).
(30/70 Rule) If you must clear obstructions on takeoff, you'll need to have 70% of your rotation speed by the time you've traveled 30% of your available takeoff distance.
Instruments and Equipment: Rule 57 of Aircraft Rules, 1937 and Civil Aviation Requirements Section 2 - Airworthiness Series 'I' Part II and Series 'R' Part I- Provides for minimum instruments and equipment including Communication and Navigation equipment which are to be installed on aircraft depending on their ...
—No person shall take, or cause or permit to be taken, at a Government aerodrome or from an aircraft in flight, any photograph except in accordance with and subject to the terms and conditions of a permission in writing granted by the Director-General, a Deputy Director-General, the Director of Regulations and ...
Assess what is required to fly the missions you execute most often, and these are your must-haves regardless of the purchase. By nature these needs should influence roughly 90 percent of your decision. The other 10 percent is generally based on emotion.
Start descent at three times your altitude (in thousands of feet) to achieve a 3 degree descent. If you are at 45,000 feet, for example, round the altitude up to 50, just to make things easy, and start down at 3 x 50 = 150 miles out.
A three-degree glideslope refers to the angle of descent an aircraft will use. In other words, the angle between the flight path and the ground. The larger the angle, the steeper the descent, and the higher the rate of descent. A commercial aircraft will typically descend at between 1,500 and 3,000 feet per minute.
Little or no slope: 0 - 3 % gradient. Gentle slopes: 4 - 9 % gradient. Moderate slopes: 10 - 15 % gradient. Steep slopes: 16 - 30 % gradient.
That's one of the fundamentals of establishing a stable approach. A three-degree glideslope also simplifies some basic things for the instrument pilot. One of them is that a three-degree descent uses up 318 feet of altitude for each nautical mile traveled.
Use the same indicated airspeed for landing regardless of altitude. A 10 percent increase in touchdown speed equals a 21 percent increase in landing distance.
Rule 58 of Aircraft Rules, 1937 requires that every aircraft shall be weighed and its centre of gravity determined.
If your employer schedules you for an eight hour rest period, your next rest period must be at least 10 consecutive hours and must begin no later than 24 hours after the beginning of the eight hour rest period. You can find additional guidance on our Cabin Safety Legal Interpretations website.