Clearance standards reference
These are the values the engine uses, transcribed from the documents named with each table. Standards are amended; check the edition that applies to your aerodrome before relying on a figure.
On this page
Sources
- ICAO Annex 14, Volume I (Amendment 18, state letter SL 2025/23): Table 3-1 and 3.13.6.
- ICAO Doc 9157, Aerodrome Design Manual, Part 2: Table 1-1.
- FAA AC 150/5300-13B, Airport Design, Change 1: Tables 4-1 and 4-2.
- EASA CS-ADR-DSN uses the ICAO values for stand clearance and wheel-to-edge clearance. Verify against the current CS-ADR-DSN issue.
ICAO (and EASA)
By aerodrome reference code letter
The code letter is taken from the library, or derived from the wingspan. Because the simulation already contains the aircraft's real track-in, the engine applies the wingtip increment: the Table 3-1 centreline-to-object distance minus half the maximum span of the code and minus the allowable lateral deviation.
| Code | Span < | Twy ℄ to object | Txl ℄ to object | Lateral dev. | Twy increment | Txl increment | Stand clearance | Twy width |
|---|---|---|---|---|---|---|---|---|
| A | 15 | 15.5 | 12 | 1.5 | 6.5 | 3 | 3 | 7.5 |
| B | 24 | 20 | 16.5 | 2.25 | 5.75 | 2.25 | 3 | 10.5 |
| C | 36 | 26 | 22.5 | 3 | 5 | 1.5 | 4.5 | 15 |
| D | 52 | 37 | 33.5 | 4 | 7 | 3.5 | 7.5 | 23 |
| E | 65 | 43.5 | 40 | 4 | 7 | 3.5 | 7.5 | 23 |
| F | 80 | 51 | 47.5 | 4 | 7 | 3.5 | 7.5 | 23 |
Twy = taxiway, Txl = aircraft stand taxilane, ℄ = centreline. Stand clearance is Annex 14 3.13.6; taxiway width is the straight taxiway pavement width used as the nominal width by the fillet tool. Example, code C taxiway: 26 − 36/2 − 3 = 5.0 m.
Wheel-to-edge clearance
Minimum clearance between the outer main-gear tyre and the pavement edge, by outer main gear wheel span (OMGWS), ICAO Doc 9157 Part 2 Table 1-1:
| Outer main gear wheel span | Clearance (m) |
|---|---|
| up to 4.5 m (exclusive) | 1.5 |
| 4.5 m up to 6 m (exclusive) | 2.25 |
| 6 m up to 9 m (exclusive), wheelbase < 18 m | 3 |
| 6 m up to 9 m (exclusive), wheelbase ≥ 18 m | 4 |
| 9 m and above | 4 |
FAA
Wingtip clearance by Airplane Design Group
AC 150/5300-13B Table 4-1. The engine converts feet to metres (1 ft = 0.3048 m). For the stand context it uses the taxilane value.
| ADG | Taxiway (ft) | Taxiway (m) | Taxilane (ft) | Taxilane (m) |
|---|---|---|---|---|
| I | 20 | 6.10 | 15 | 4.57 |
| II | 22.5 | 6.86 | 15.5 | 4.72 |
| III | 26.5 | 8.08 | 20 | 6.10 |
| IV | 36 | 10.97 | 26.5 | 8.08 |
| V | 35.5 | 10.82 | 28 | 8.53 |
| VI | 36.5 | 11.13 | 30 | 9.14 |
Taxiway edge safety margin and width by Taxiway Design Group
AC 150/5300-13B Table 4-2. The TESM is used as the wheel-to-edge margin under FAA; the width is the nominal straight taxiway width.
| TDG | TESM (ft) | TESM (m) | Width (ft) | Width (m) |
|---|---|---|---|---|
| 1A | 5 | 1.52 | 25 | 7.62 |
| 1B | 5 | 1.52 | 25 | 7.62 |
| 2A | 7.5 | 2.29 | 35 | 10.67 |
| 2B | 7.5 | 2.29 | 35 | 10.67 |
| 3 | 10 | 3.05 | 50 | 15.24 |
| 4 | 10 | 3.05 | 50 | 15.24 |
| 5 | 14 | 4.27 | 75 | 22.86 |
| 6 | 14 | 4.27 | 75 | 22.86 |
| 7 | 14 | 4.27 | 75 | 22.86 |
How the values are applied
- Clearance envelope = swept envelope buffered by the clearance for the chosen standard and context. A clearance override replaces it; the standard None applies 0 m.
- Edge margin is checked against the wheel-to-edge clearance: ICAO Table 1-1 for ICAO and EASA, TESM for FAA.
- Stand design draws the stand clearance zone around the parked aircraft: Annex 14 3.13.6 for ICAO and EASA, the ADG taxilane wingtip clearance for FAA.
- Fillet design uses the wheel-to-edge clearance and the nominal taxiway width, each of which can be overridden.
Where a record lacks an ADG or TDG, the engine falls back to ADG III and TDG 3. Check adg and tdg in the aircraft library table for your design aircraft.