Quantcast Maintenance Procedures - 1023_40066

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MIL-HDBK-1023/4
Table 13
Preventive Maintenance Inspection Schedule for
Centerline and Touchdown Zone Lighting Systems
D
W
M
B
S
A
U
A
K
T
I
M
N
N
Maintenance requirement
I
L
H
M
A
N
S
L
Y
L
H
N
L
C
Y
Y
Y
Y
Y
H
1.
Check for burned-out or dimly burning lights.
X
2.
Repair or replace defective lights.
X
3.
Clean lights with dirty lenses.
X
4.
Check the intensity of selected lights.
X
5.
Check the torque of mounting bolts.
X
6.  Clean and service light; check electrical
X
connections.
7.  Check for water in the light base.
X
8.  Replace lamps after 80 percent of service life.
X
X
9.  Remove snow from around fixtures.
X
10. Check wires in saw kerfs.
X
5.7.2
Maintenance Procedures. Servicing in pavement lighting should be scheduled to cause
the minimum disruption to normal airport operations. For this reason, it is recommended that a
number of spare fixtures be kept for installation in place of defective fixtures. The number of
spare fixtures should be about 10 percent of the total number of in pavement lights in use. By
replacing the defective light with a spare unit, minimum time is spent on the runway; the
defective light may be repaired in the shop. The procedures below give a generalized approach
to repair; for more specific information about a particular light, consult the manufacturer's
instruction book.
a) Light Removal. The light fixture must be removed for relamping or base
inspection. When removing the fixture for base inspection, be careful not to damage the
connections to the isolation transformers. In cold weather, ice or snow may obstruct the bolt
heads and make fixture removal difficult. Some facilities have constructed a wooden box,
slightly larger than the fixture and a few inches tall. The box has an electric heating element
inside, and an open bottom. When it is necessary to remove a frozen fixture, the box is placed
over it, and the heating element is connected to a power source (usually a generator on the back
of a truck). When the box heats the fixture enough to melt the ice, removal may be easily
accomplished.
b) Cleaning. Several different techniques are available for cleaning the exterior
glassware of inset lights. Some techniques require special equipment and are suited to large
scale and frequent access with the light installed, while other techniques are more suited to bench
cleaning of a light. The maintenance supervisor should select the method best adapted to the
facility. Remember that not all techniques may be used with all lights; the manufacturer's
recommendations contained in the instruction book are the final authority.
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