Table 6-4. Airport Obstruction Accuracy Requirements
Table 6-5. Airport Runway Accuracy Requirements
a. Horizontal Requirements. Horizontal accuracy requirements can be met through third-order,
Class II traverse, GPS, or two-point intersection methods.
b. Vertical requirements.
Vertical accuracy requirements dictate a minimum of third-order
differential-leveling methods.
PART C - REPORTING
6-5. General. The required reporting for airfield-related surveys is not significantly different from that
required for other survey operations. The parent unit will normally require all of the reports listed in FM
3-34.331. In addition to these routine reports, a special report will be required to submit the final data.
This report will be completed according to AR 95-1, AR 95-2, FAA 405, and FAR-77. For quick
reference, the required documentation is listed below.
a. Airport Obstruction Chart. An AOC is a 1:12,000-scale graphic depicting FAR-77 guidance.
An AOC represents objects that penetrate airport imaginary surfaces, aircraft movement and apron
areas, NAVAIDs, prominent airport buildings, and a selection of roads and other planimetric details in
the airport vicinity. Also included are tabulations of runway and other operational data. AOC data is
current as of the date of the field survey. The AOC consists of four sections:
The airport plan (AP).
EN0593
6-10
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