 |
|||
|
Page Title:
Engine installation and removal |
|
||
| ||||||||||
|
|  MIL-T-83229 B(USAF)
4. 6.2.1 Engine installation and removal. The trailer length shall be
adjusted to the retracted position and the mockup bare engine configuration
shall be hoisted into position on the trailer. The engine shall be
mounted on the trailer with particular attention given to the compatibility
of the trailer mounting supports and engine fixtures. The lift mechanism
shall be operated through the entire range of travel and the safety lock
capability shall be demonstrated.
4.6.3 Mobility tests. While supporting the rated capacity load, the
trailer shall be tested for type I, group C mobility in accordance with
MIL-M-8090, with the following exceptions:
4.6.3.1 Towing distances. The towing distances shall be 50 miles over
level paved highway type surface and 50 miles over the type I test course.
Fifty percent of each test distance shall be with the trailer in the
extended position and the remaining fifty percent in the retracted position.
4.6.3.2 Towing speeds. Towing speeds for the paved roads shall be
10
mph and 5
mph for the type I test course.
4.6.3.3 Rear steering. The manual operation and lockout capabilities
of the rear steering mechanism shall be demonstrated.
4.6.4 Excessive load indicator test. A test shall be performed to
demonstrate that the excessive load indicator provides a visual indication
that loads of 3.5g or greater have been transmitted to the mounted engine
during mobile operations.
Static proof load tests.
4.6.5
4.6.5.1 A static proof down load of 24,000 pounds shall be applied to the
trailer through the engine mounting supports. The trailer length shall be
extended; the lift mechanism shall be centrally positioned; and the safety
locks shall be disengaged. Footpads shall be clear of the ground line.
The load shall be maintained for 3 minutes without evidence of leakage,
instability, or permanent deformation of any component or part during or
after completion of the test.
4.6.6 Endurance tests. The lift mechanism shall be operated through its
entire range capability for 50 cycles, while the trailer is supporting the
bare mockup engine. At the completion of every fifth cycle, the engine shall
be removed and reinstalled on the trailer mounting supports. The trailer
extension and retraction mechanism shall then be operated through 50 cycles.
At the completion of every fifth cycle, and while the trailer is in the
retracted position, the bare mockup engine shall be installed and removed
from the trailer mounting supports. Failure, deterioration, undue wear,
or unsatisfactory operation resulting from the endurance tests shall be
cause for rejection.
Leakage inspection. During the endurance tests, the trailer shall
4.6.6.1
be inspected for leakage. Fluid lines, fittings, pumps, and other components
shall show no leakage. However, if pumps and other equipment have packed
glands that can be tightened during the endurance test to stop leakage that
may have occurred, such adjustments will be acceptable.
6
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals