Performance Flashcards
TODR
Take Off Distance Required - is the distance required to take-off from a standing start at max T/O power and reach a screen height above the runway at the T/O safety speed
Screen Height
Usually 50ft and it is the height of an imaginary screen which the a/c would clear at the end of the runway in an unbanked attitude with landing gear extended
Take off safety speed
Speed that gives an adequate margin above the stalling speed (it can’t be less than 1.2Vs in the T/O config)
TODA
Take-off distance available - is the length of the take-off run available + any length of clearway.
Clearway
A defined rectangular area on the ground or water at the departure end of the runway selected as a suitable area over which an a/c may make a portion of its initial climb to a specific height
TORA
Take off run available - it means the length of runway declared by the aerodrome operator as available and suitable for the ground run of an a/c taking off
ASDA
Accelerated stop distance available - is the distance specified by the appropriate authority as being the effective length available for use by an a/c that’s executing an abandoned / rejected take-off (the effective length may include a stopway)
Stopway
A rectangular area on the ground at the end of the runway in the direction of take-off which is designated and prepared by the competent authority as an area in which the a/c can be stopped in the case off a rejected take-off
Gradient of climb
Ratio of height gained over horizontal distance travelled expressed as a percentage
An a/c travels a horizontal distance of 8000ft and gains 500ft of altitude what is the gradient of climb?
6.3 %
500/8000 = 0.063 (x100 = 6.3%)
Gross flight path
The flight path it is assumed the a/c will follow when flown in a particular config in accordance with specified procedures (the flight path is established from the a/c’s certification performance data and can be accepted as the average fleet performance for the a/c type)
Net flight path
Is the gross flight path reduced by specified margins, these margins make allowance for the reduced performance that could be expected in an emergency situation in unfavourable conditions i.e severe turbulence
LDA
Landing distance available is the length of runway that is declared by the aerodrome operator as available and suitable for the ground run of an a/c, it starts at the landing threshold
Landing threshold
Is the beginning portion of the runway declared usable for landing.
LDR
Landing distance required is the horizontal distance measured from a point 50ft above the runway threshold to the point where the a/c can be brought to a complete stop with max braking (it is assumed that the approach to the runway is steady and that the speed at the 50ft point / screen height over the threshold is not less than 1.3vs or the speed published in the flight manual, whichever is greater)
Dry runway
Means it’s not wet or contaminated and includes a paved runway that has been specifically prepared with grooves / porous pavement to retain effectively dry braking action even when liquid moisture is present