| RA | string
| Remote altimeter |
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| AS | string
| Airspace |
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| AT | string
| Air traffic |
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| AC | string
| Accuracy code |
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| SI | string
| Straight-in minimums |
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| XL | string
| Excessive length of final |
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| PR | string
| Precipitous terrain |
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| HAA | string
| Minimum required HAA (height above airport) calculated, round to a reportable value, and applied for charted |
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| MA | string
| Missed approach due to obstacle penetration of missed approach slope (segment assessment area) |
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| PT | string
| Procedure turn |
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| DG | string
| Descent gradient |
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| GS | string
| Glideslope - adjustment to set altitude at glideslope intercept |
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| CA | string
| Cardinal altitude |
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| MT | string
| Mountainous terrain |
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| MAH | string
| Missed approach hold |
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| SA | string
| Secondary area (also X/y surfaces, transition areas) |
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| AAO | string
| Adverse Assumption Obstruction. Designates adjustment to a terrain value to account for natural vegetation growth, uncharted cell phone towers, buildings, and other man-made obstructions. |
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| VA | string
| Vegetation Allowance. Designates an adjustment to a terrain value to account for natural vegetation growth. |
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| OTHER | string
| Other |
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