12 August 2002
or guide to drill holes in the pavement. Hole depth and size is dependent on the type of
anchor bolt being used.
REPAIR EVALUATION METHODS
Acceptance Criteria. Crater repairs must be evaluated before acceptance
for aircraft operations. The following areas should be considered:
2-5.1.1 Repair Compaction. The strength of the backfill, debris, or subgrade
materials must be verified. Depending upon the repair method used, the thickness and
strengths of all surface and/or base course materials must also be verified. The soil
structure should be tested using a dynamic cone penetrometer (DCP) to determine
CBRs of each layer. These tests must be accomplished before placing the FOD covers,
AM-2 matting, stone and grout, asphalt, concrete, or other surface materials that would
prevent the use of the DCP.
2-5.1.2 Surface Roughness. The final grade of the repair must be checked using
line-of-sight profile measurement stanchions, upheaval posts, or string lines to ensure
the repair meets surface roughness criteria contained in T.O. 35E2-4-1. Procedures are
described in T.O. 35E2-5-1, Crushed-Stone Crater Repair and Line-Of-Sight Profile
Measurement for Rapid Runway Repair. In the case of a crushed stone repair without a
FOD cover, the repair surface should be checked for loose aggregate or potential FOD.
2-220.127.116.11 FOD covers should be no more than 5 degrees off parallel with the runway
2-18.104.22.168 Check connection bolts and verify that all connections between panels are
tight and secure.
2-22.214.171.124 Check anchor bolts and verify that all bolts are secure and that the FOD cover
is held snugly against the pavement surface. In taxiway and apron applications, the
leading and trailing edges of the FOD cover must be anchored. The side edges must
also be anchored if the cover is located in an area where aircraft will be required to turn.
2-5.1.4 Setting/Curing. If the repairs are capped with concrete, stone and grout, or
rapid-set materials, verify that the surface material has set and that adequate cure time
is allowed prior to aircraft operations.
2-5.1.5 Clean-up. For all repair methods, verify that the repair and adjacent area is
cleared of any excess repair materials.
The on-site engineer responsible for the repair will certify that the repair was