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Arrival
Add power sooner on final to hold 145 kt by the stabilisation gate, not just at the threshold.
What happened: The approach was slow at the stabilisation gate, and the aircraft carried that deficit all the way to the threshold, still 51 kt below VREF; arriving that slow usually leaves little energy to cushion the flare, as it did here with a touchdown rate of 316 fpm.
Watch for: Airspeed indicator: 145 kt at the threshold
Every knot above Vref is stored kinetic energy, and energy stored at the threshold must be dissipated in ground effect before the aeroplane will stop flying. Because kinetic energy scales with the square of speed, the excess you must dissipate grows fast. At a 45-knot approach, five knots hot is over a tenth more speed and roughly a quarter more energy to get rid of in ground effect. This is why the fix is never in the flare. It was decided three miles earlier, on final, at the airspeed indicator.
Read more in VRef ExplainedStart to finish · 15 stages, 14 in the score
Events
Events
Events
The threshold, the flare and the hold-off. The approach that led to it is the stabilisation gates below.
One stabilised approach gate for a circuit: seven checks where the approach path is 500 ft above the runway. The 1,000 ft gate is an instrument-approach check and does not apply. These checks are the approach's score.
At the 500 ft gate: speed 33 kt SLOW on the reference speed of 145 kt.
The approach, gate by gate
Side view — the last 1,524 m of the approach.
Plan view — the first 1,524 m of the 3,056 m runway, to the same scale as the side view.
The 174 m touchdown sits inside the full-score zone. The arrival was smooth.
The rest of the report
Departing from RAAF Base Amberley, the Boeing C17 initiated its departure roll on runway 15, accelerating to a liftoff speed of 144 kt after a takeoff distance of 1,551 m, which accounted for 51% of the available runway length. The local weather conditions at the time were characterized by a temperature of 17 °C and a gentle wind of 5 kt at 80 °, resulting in a negligible headwind component of 1 kt.
As the aircraft entered the right-hand traffic pattern, it demonstrated a smooth and controlled turn, completing the pattern entry in 21 seconds and covering a distance of 1 nm. The subsequent right-hand pattern crosswind turn was executed with equal precision, requiring less than 1 nm in 8 seconds to complete. The aircraft then proceeded to the downwind leg, where it maintained a steady heading and altitude, covering a distance of 5 nm in 81 seconds. The subsequent base leg turn and final approach were executed with similar precision, culminating in a firm touchdown on runway 15 at a speed of 93 kt and a touchdown distance of 166 m.
The landing was characterized by a good threshold height and a threshold speed of 94 kt, which was well below the target to avoid stalling. The touchdown rate of -356 fpm was firm, and the runway touchdown alignment was very good. The total landing distance of 700 m accounted for 23% of the available runway length, and the runway rollout alignment was perfect. The aircraft's performance was further highlighted by its efficient fuel consumption, using 1,281 kg of fuel to cover a total distance of 15 nm in 5 minutes.
The Boeing C17 touched down on runway 15 at YAMB RAAF Base Amberley with a score of 94.8%. The aircraft approached the runway from the north, heading 159.0° at 2 nautical miles and 571 feet above ground level. The final approach quality was satisfactory, with a good threshold height and a threshold speed of 94 kt, which was well below the target to prevent stalling.
As the aircraft made contact with the runway, it demonstrated good touchdown characteristics, with a touchdown distance of 166 meters and a touchdown speed of 93 kt. The touchdown rate was firm at -356 feet per minute, indicating a controlled descent. The runway touchdown alignment was very good, with the aircraft centered on the runway. The local weather conditions, with a temperature of 15°C and a wind of 5 kt at 80°, contributed to a relatively smooth landing.
The total landing distance of 700 meters was 23% of the runway length, indicating a controlled rollout. The runway rollout alignment was perfect, with the aircraft maintaining its centerline alignment throughout the rollout phase. Overall, the landing was satisfactory, with the aircraft demonstrating good control and precision throughout the approach, touchdown, and rollout phases.
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