getting to grips with aircraft performance 如何掌握飞机性能 1(22)

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a) The takeoff distance on a dry runway is the greater of the following values:
.  
TODN-1 dry = Distance covered from the brake release to a point at which the aircraft is at 35 feet above the takeoff surface, assuming the failure of the critical engine at VEF and recognized at V1,

.  
1.15 TODN dry = 115% of the distance covered from brake release to a point at which the aircraft is at 35 feet above the takeoff surface, assuming all engines operating.

1 Some A320s are certified with amendment 25-42, others with post-amendment 42.

TODdry = max of {TODN-1 dry, 1.15 TODN dry}
b)   The takeoff distance on a wet runway is the greater of the following values:
.  
TODdry = Takeoff distance on a dry runway (see above),

.  
TODN-1 wet = Distance covered from brake release to a point at which the aircraft is at 15 feet above the takeoff surface, ensuring the V2 speed to be achieved before the airplane is 35 feet above the takeoff surface, assuming failure of the critical engine at VEF and recognized at V1.

 

3.1.3. Takeoff Run (TOR)

3.1.3.1. Runway with Clearway
a) The takeoff run on a dry runway is the greater of the following values (Figure C6):
.  
TORN-1 dry = Distance covered from brake release to a point equidistant between the point at which VLOF is reached and the point at which the aircraft is 35 feet above the takeoff surface, assuming failure of the critical engine at VEF and recognized at V1,

.  
1.15 TORN dry = 115 % of the distance covered from brake release to a point equidistant between the point at which VLOF is reached and the point at which the aircraft is 35 feet above the takeoff surface, assuming all engines operating.

TORdry = max of {TORN-1 dry, 1.15 TORN dry}
b) The takeoff run on a wet runway is the greater of the following values:
.  TORN-1 wet = Distance covered from the brake release to a point at which the aircraft is at 15ft above the takeoff surface, ensuring the V2 speed to be achieved before the airplane is 35 feet above the takeoff surface, assuming the failure of the critical engine at VEF and recognized at V1. It is equal to TODN-1 wet .

3.1.3.2. Runway without Clearway
The takeoff run is equal to the takeoff distance, whatever the takeoff surface (dry or wet).
3.1.3.3. Clearway Influence on a Wet Runway
With a wet runway, the takeoff run with one engine-out is always equal to the takeoff distance with one engine-out (i.e. from brake release to 15 feet). Therefore, a clearway does not give any performance benefit on a wet runway, as the TOR is always more limiting (TORA less than TODA).
3.1.4. Accelerate-Stop Distance (ASD)

a) The accelerate-stop distance on a dry runway is the greater of the following values:
. ASDN-1 dry = Sum of the distances necessary to:
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Accelerate the airplane with all engines operating to VEF,
　
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