30 June 2001
D.1.2.2. Complete justification for noncompliance with the airfield/airspace criteria and/or design
standards. Demonstrate that noncompliance will provide an acceptable level of safety, economics,
durability and quality for meeting the Army mission. This would include reference to special
studies made to support the decision. Specific justification for waivers to criteria and allowances
must be included as follows:
D.184.108.40.206. When specific site conditions (physical and functional constraints) make compliance
with existing criteria impractical and/or unsafe; for example: the need to provide hangar space
for all aircraft because of recurring adverse weather conditions; the need to expand hangar
space closer to and within the runway clearances due to lack of land; maintaining fixed-wing
Class A clearances when support of Class B fixed-wing aircraft operations are over 10% of the
D.220.127.116.11. When deviation(s) from criteria fall within a reasonable margin of safety and do not
impair construction of long range facility requirements; for example, locating security fencing
around and within established clearance areas.
D.18.104.22.168. When construction that does not conform to criteria is the only alternative to meet
mission requirements. Evidence of analysis and efforts taken to follow criteria and standards
must be documented and referenced.
D.1.2.3. The rationale for the waiver request, including specific impacts upon assigned mission,
safety, and/or environment.
D.1.3. Additional Requirements:
D.1.3.1. Operational Factors. Include information on the following existing and/or proposed
operational factors used in the assessment:
D.22.214.171.124. Mission urgency.
D.126.96.36.199. All aircraft by type and operational characteristics.
D.188.8.131.52. Density of aircraft operations at each air operational facility.
D.184.108.40.206. Facility capability (VFR or IFR).
D.220.127.116.11. Use of self-powered parking versus manual parking.
D.18.104.22.168. Safety of operations (risk management).
D.22.214.171.124. Existing NAVAIDS.
D.1.3.2. Documentation. Record all alternatives considered, their consequences, necessary
mitigative efforts, and evidence of coordination.
D.2. Air Force:
D.2.1. Waivers to Criteria and Standards. When obstructions violate airfield imaginary surfaces or
safe clearance criteria established in this manual, they must be analyzed to determine impact to
aircraft operations. Facilities listed as permissible deviations (see attachment 14) do not require
waiver if sited properly. Facilities constructed under
previous standards should be documented as exemptions and programmed for replacement away
from the airfield environment at the end of their normal life cycle, or when mission needs dictate
earlier replacement. When documenting waiverable items, consider grouping adjacent supporting
items with a controlling obstruction, or grouping related items such as a series of drainage structures,
as one waiver. Example: The base operations building violates the 7H:1V Transitional Surface and
apron clearance criteria. There are also four utility poles, a 36-inch tall fire hydrant, and numerous
trees and shrubs located on the side of the building that is farthest away from the apron. These items
are essential to provide architectural enhancement and utilities for this structure, but they also violate
apron clearance criteria. Because these items are isolated from aircraft operations by the base
operations building, they would not become a hazard to aircraft operations until the base operations
building is relocated. Therefore, the base operations building is the controlling obstruction. Document