Figure 1-27.--B-4A maintenance platform.
B-4A MAINTENANCE PLATFORM.--The
B-4A maintenance platform (fig. 1-27) is a moveable,
hydraulically operated, adjustable platform with a
ladder assembly. It has free swivel caster assemblies,
with each having a foot lever-actuated mechanical
brake and lock mechanism. The platform is equipped
with safety guardrails and locking pins that lock the
extension scissors. This prevents the platform from
collapsing in the event of a hydraulic system failure.
The height range is 3 to 7 feet. Overall height of the
Figure 1-25.--Variable height tripod jack, two-leg extension.
B-4A is 6-1/2 feet lowered and 10-1/2 feet raised, and it
has a weight bearing capacity of 600 pounds.
Maintenance Platforms and Trailers
B-5A MAINTENANCE PLATFORM.--The
B-5A maintenance platform (fig. 1-28) is a moveable,
Maintenance stands, platforms, or work stands (the
names are commonly interchangeable) provide a means
to reach most parts of an aircraft that can not be reached
safely from on the ground. There are a variety of types
and models available. The following text discusses a
few of the common maintenance stands.
Figure 1-28.--B-5A maintenance platform.
Figure 1-26.--Fixed height tripod jack.