MIL-DTL-87158C
6.4.4.3 Class C, acceptable damage. Damage limits which do not impose any operational restrictions
on the aircraft, when structural repair is not performed. Minimal cleanup of damage may be required
(e.g., stop drill, stress reduction, etc.).
6.4.5 Degradation. The reduction in systems/subsystems/components performance capability that is required
for a designated mission or system operation.
6.4.6 Essential. Those systems/subsystems/components that are required for a designated mission or
system operation.
6.4.7 Flight safety hazard. An existing or potential condition that can result in a light mishap.
6.4.8 Full capability (FC). Those systems/subsystems/components that are required, as originally designed,
for full mission operation.
6.4.9 Not required (NR). Those systems/subsystems/components that are not required for a designated mission.
6.4.10 Degraded performance (DP). Identiies those systems/subsystems/components that can fulill the
requirements of a designated mission while operating at less than normal level.
6.4.11 Interchangeability. As deined in this speciication, interchangeability is above the scope of the
classic deinition. The intent/purpose of this speciication is to allow fully innovative ixes/repairs to the
aircraft. This includes minor modiications that can be made to achieve interchangeability.
6.4.12 Leak rate. The speed or rate of low of luid or gas escaping from a system, when the
escape is caused by damage processes. The leak rate is inluenced by such factors as the hole size,
internal/external pressures, and luid level.
6.4.13 Orthographic view drawing. As outlined in ANSI Y14.3M-1994.
6.4.14 Load limit. The design load for unrestricted operations, and/or the equivalent of a designated
condition for the load envelope cases consistent with any aircraft operational restrictions.
6.4.15 Typical repairs. Typical ABDAR repairs are all repairs that provide full or partial mission
capability (e.g., saing a nonessential system).
6.5 Subject term (key word) listing.
· ABDAR
· Damage limitations
· Fire and heat damage
· Rotary wing/ixed wing aircraft zones
· Structural repairs
· Structure analysis
6.6 Category I, primary airframe structures. These are airframe structural members which are absolutely
essential to maintain aircraft structural integrity, and are of primary signiicance. Any repair of these
members requires retention of some minimum value of structural strength and stiffness, consistent with the
original design parameters, and fabricated structural repairs for them are possible. These members are to
receive irst and foremost consideration from the assessor (see 3.12.2.1.1).
6.7 Category II, secondary structures. These are structures which serve to transfer aerodynamic and other
loads to the primary structural members. These structures primarily consist of external skin panels that are
not considered primary stress panels, intermediate ribs, stringers, and formers which only serve to transfer
loads to primary members. Repair of these structural members does not require restoration of original design
strength and stiffness within the content of a wartime environment (see 3.12.2.1.2).
6.8 Category III, nonessential structure. These are structures such as doors, panels, tips, fairings, etc.,
which may be extensively damaged or completely missing, and no repair or replacement is required to
maintain the airworthiness or mission capability (see 3.12.2.1.3).
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