Bell OH-58A Technical Manual page 58

TM 55-1520-228-BD
AIRFRAME
(1) The factor applies to the
damage actually measured not to the
maximum damage limit for the structure.
(2) The factor applies to the
largest dimension of the largest damage
between which separation is being
measured.
(3) The factor applies only if the
dimensions of both damages, when added
together, exceed the single damage
limit.
CONDITION.
4-9.
cator of the residual capacity of a
damaged structural element to perform
its function. Battlefield damaged
structures or BDAR repaired structures
are classified in three conditions:
a. Condition 1.
flight capable.
However, on a battlefield under the
pressures of time and tactical situa-
tions, the assessment of structural
damage may not have found all the dam-
Therefore, aircraft with struc-
ages.
tural damage, whether repaired or repair
deferred, should be inspected after
every flight. The inspector should
look for crack growth, evidence of
overstress, growth of allowable defor-
mations, and for the development of new
cracks at other locations.
b. Condition 2.
capable. Self-recovery may be required
to move a damaged aircraft to a repair
site or from one site to another when
towing is not feasible. Self-recovery
is preferable to disassembly and boxing
an aircraft for transportation.
permits, proceed as follows:
(1) Mark all visible cracks and
the extent of other structural damage
with chalk, grease pencil, paint, tape,
or other available means so that any
growth in the damage can be quickly
recognized.
4-14
Condition is an indi-
Aircraft fully
No flight restrictions.
Self-recovery
As time
(2) Perform any feasible
on-site BDAR fixes as required for
self-recovery.
(3) Unload all ammunition,
weapons, stores, and unnecessary equipment.
(4) The following restrictions
are imposed on a recovery flight:
(a) Maximum airspeed: 50 kts
Maximum engine torque:
(b)
(c) Maximum flight time:
2 hours.
(d) Use gradual and smooth
pedal movements to minimize loads on
aircraft.
(e) Land at level attitude;
soft touchdown from hover.
c.
Condition 3.
exceeding condition 2 limits generally
does not allow self-recovery. The
damage may or may not be repairable by
BDAR techniques.
extensively damaged that no useful or
needed functions can be restored within
available time and resources.
aircraft will be:
(1) Recovered or evacuated to a
facility with the resources to repair
the airframe.
(2) Used as a source of cannibal-
ized components.
(3) Destroyed. This is a last
resort. These conditions apply to the
primary structure and should not be con-
fused with the mission capability
classifications.
dependent on equipment condition.
80% at O kts
64% at 16 kts
53% at 32 kts
50% at 50 kts
Structural damage
The airframe may be so
These
Mission capability is