3-52.
What type of rings are used with
the MS28775 packing in most modern
aircraft with hydraulic system
pressures up to 3,000 psi?
1.
O-rings
2.
U-rings
3.
V-rings
4.
Backup rings
3-53.
O-rings identified by colored dots,
dashes, or stripes are only
authorized for use on aircraft
hydraulic systems that have less
than 1,500 psi operating pressure?
1.
True
2.
False
3-54.
O-ring age is computed by what
means?
1.
From the
2.
From the
3.
From the
4.
From the
cure date
service life
replacement schedules
operational conditions
3-55.
A torn O-ring package should be
secured with which of the following
materials?
1.
Staples
2.
Moistureproof glue
3.
Pressure-sensitive, moisture-
proof tape
4.
Hermetically sealed, heatproof
barrier paper
3-56.
Which of the following materials
should NOT be used to fabricate
tools for use in replacing and
installing O-rings and backup
rings?
1.
Wood
2.
Steel
3.
Brass
4.
Phenolic rod
3-57.
What method should you use to
inspect the inner diameter of an
O-ring for cracks?
1.
Perform NDI
2.
Use a small mirror
3.
Roll it onto an inspection cone
or dowel
4.
Stretch it between two fingers
and visually examine it
3-58.
3-59.
3-60.
3-61.
3-62.
3-63.
3-64.
When an O-ring installation
requires spanning or inserting
through sharp threaded areas,
ridges, slots, and edges, which of
the following devices or procedures
should you use?
1.
O-ring expanders
2.
O-ring entering sleeves
3.
A rolling motion of the O-ring
4.
Light coating of threads with
MIL-S-8802
What are the two types of backup
rings used in naval aircraft?
1.
Teflon® single and double
spiral
2.
Leather and polyvinyl
3.
O-ring and V-ring
4.
Flat and parallel
What is the specified shelf life,
if any, of Teflon® backup rings?
1.
1 year
2.
2 years
3.
3 years
4.
None
Teflon® backup rings are identified
by which of the following means?
1.
Color coding
2.
Coded symbols
3.
Package labels
4.
Visual appearance
When you installing Teflon® spiral
rings in an internal groove, you
must use a right-hand spiral.
1.
True
2.
False
A metallic wiper is installed in
what position?
1.
The lip facing inward
2.
The lip facing outward
3.
The groove facing inward
4.
The groove facing outward
Which of the following protective
closures are approved for sealing
hydraulic equipment?
1.
Metal caps only
2.
Metal caps and plugs only
3.
Plastic caps and plugs only
4.
Plastic or metal caps and plugs
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