Declared Distnaces Flashcards
Declared distances are calculated to the nearest?
Metre of foot for runway intended for use.
What are the 4 declared distances?
TORA
TODA
ASDA
LDA
What does TORA Stand for?
Take off run available
What does TODA stand for?
Take off Distance Available
What does ASDA stand for?
Accelerate Stopping Distance available
What does LDA stand for?
Landing Distance Abilable
Define a stopway
A defined rectangular area on the ground at the end of the Take off run available (TORA) prepared as a suitable area in which an aircraft can be stopped in case of an emergency.
Define clearway
A defined area on the ground under the control of the appropriate entity, selected or prepared as suitable area over which an aircraft may make a portion of its initial climb out to a specified height.
A clearway length cannot exceed?
Whichever is the least of either:
1) the distance to the first upstanding obstacle (excluding lightweight, frangible, mounted objects not exceeding 0.9 above ground level)
2)the distances the point where terrain projects through a 1:80 slope(code 3 or 4) or a 1:50 slope (code 1 or 2)
What does RESA stand for?
Runway End Safety Area
What is the purpose of a RESA?
Intended to minimise risks arising when an aeroplane overruns or undershoots a Runway.
When shall a RESA be provided?
At each end of the strip enclosing runways code 3+4 and instrument runway code 1+2
Is a RESA essential for visual runway code 1+2?
No
What is the minimum length of a RESA for a code 3 +4 Runway?
90m
What is the minimum length for a code 1+2 (instrument)
30m
What is the usual limit of a RESA?
ILS localiser (or boundary fence)
What is the width of a RESA?
Twice that of the associated runway symmetrically disposes about the extended centre line
Is the surface the same standard or graded area of the runway?
No
Define TORA
Length of runway available available and sustainable for ground run of an aeroplane taking off. (Most cases will correspond to the length of runway pavement)
Define TODA
Length of TORA plus length of clearway. Where no clearway exists TODA=TORA
Define ASDA
Length TORA plus length of any associated stopway. Where no stopway exists ASDA is equal to TORA
Define LDA.
Length of runway which is available and suitable for ground landing run of an aeroplane.
If a runway has a temporary obstacle within a runway strip what 3 things can be done?
1) Runway should be withdrawn
2) length and declared distances reduced(LDA reduced but TORA remains the same)
3) Runway downgraded to visual
