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code F taxiway to code E taxilane minimum separation distance

Posted: Mon Nov 18, 2019 3:44 am
by pcliofobb
How can I calculate the minimum separation distance for a code F taxiway to code E taxilane? any ICAO/FAA standard on this subject?

Re: code F taxiway to code E taxilane minimum separation distance

Posted: Mon Nov 18, 2019 3:54 am
by GalaxyFlyer

Re: code F taxiway to code E taxilane minimum separation distance

Posted: Mon Nov 18, 2019 4:36 am
by zeke
You wont find a FAA standard as code E and F are ICAO codes, FAA uses groups, the design requirements between FAA and ICAO have slight differences.

The answer is contained in ICAO DOC 9157 Aerodrome Design Manual Part 2 Taxiways, Aprons and Holding Bays

1.2.72 In order to minimize such restrictions, when a new facility is planned for addition to the existing airport infrastructure, it would be prudent to apply the basic clearance distance concept adopted in the development of the specifications found in Annex 14, Volume I. An example of the application of this concept would be:
An airport with an aerodrome reference code E is planning to develop a new link taxiway for code F operations, adjacent to an existing code E taxiway. What should be the separation between them?
If both taxiways are to be used for simultaneous code F aeroplane operations (provided all other relevant requirements are satisfactorily met) then the minimum separation distance should be that specified for code F in Annex 14, Volume I, Table 3-1, column 10.
If the existing taxiway is to be used by code E aircraft only, then the new code F taxiway may be located as follows:
Minimum separation distance: (1⁄2 WSE + 1⁄2 WSF) + C + ZF where WS is the wing span, C is the applicable wheel-to- pavement edge clearance (4.5 m in this case) and ZF is the safety margin (6.5 m) for Code F – the most demanding code.
In this case, airport capacity may be slightly reduced should there be a need for two code F aeroplanes to use these taxiways simultaneously since the existing taxiway is not in accordance with code F specifications. Where such a philosophy is implemented with respect to other facilities, a similar approach may be adopted, provided the values of the wheel-to-taxiway edge clearance and wing tip clearance used are those for the higher code letter.

Re: code F taxiway to code E taxilane minimum separation distance

Posted: Mon Nov 18, 2019 6:04 am
by pcliofobb
zeke wrote:
You wont find a FAA standard as code E and F are ICAO codes, FAA uses groups, the design requirements between FAA and ICAO have slight differences.
....

Thank you so much!