Aircraft Operations. Volume II - Construction of Visual and Instrument ...

II-1-1-App C-2 Procedures — Aircraft Operations — Volume II
b) the values obtained from Table II-1-1-App C-2 should be corrected by adding ΔD where:
23/11/06
SI units: ΔD = 0.00092(15 – h) cot θ (Table II-1-1-App C-2a))
and
Non-SI units: ΔD = 0.0001514(49 – h) cot θ (Table II-1-1-App C-2b))
The following formulae may be used for intermediate distances, heights and glide path angles as well as for values
which are greater than the maximum values indicated in Tables II-1-1-App C-1 and II-1-1-App C-2:
SIunits: H=h+1000Dtan θ + 0.0785 D 2
and
Non-SI units: H = h + 6 076 D tan θ + 0.8833 D2
3. Heights are rounded up to the nearest multiple of 5 m (10 ft), and distances are rounded to the nearest tenth of a
kilometre (nautical mile).
Note 1.— When heights are rounded up to the nearest multiple of 5 m (10 ft), the check referred to in paragraph 2
will not result in significant differences from the conventional geometric right-angle triangle calculation for threshold
distances of less than 8 km or 4 NM. This also applies when distances are rounded to the nearest tenth of a kilometre
(NM) for heights less than 500 m or 2 100 ft.
Note 2.— To determine glide path heights at the outer marker fix or other fix, unrounded height values are used.