Quantcast Illuminated Signs

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MIL-HDBK-1023/4
(3) Check fuse holders, breakers, and contacts. Carefully inspect contacts in the
control cabinet. If the contacts are badly worn, replace them. Do not file or burnish contacts.
Discoloration of contacts or some roughness due to normal arcing is not harmful. Wipe the
contacts to remove the dust. Replace blown fuses with the correct size and type. Do not assume
that the old fuse is the correct size and type.
Table 19
Preventive Maintenance Inspection Schedule for
High-Intensity Approach Systems (ALSF-1/ALSF-2)
D
W
M
S
A
A
K
T
M
N
Maintenance Requirement Checklist
I
L
H
A
N
L
Y
L
N
L
Y
Y
Y
Y
1.
Check for burned-out lamps.
X
2.
Check system operation.
X
3.
Replace burned-out lamps.
X
4.
Check in pavement lights for
X
cleanliness.
5.  Record input and output voltages of control
X
cabinet.
6.
Clean any vegetation obstructing the
X
lights.
7.
Check structures for integrity.
X
8.
Check photoelectric controls (if used).
X
9.
Check electrical distribution equipment.
X
10.
Check insulation resistance of cable.
X
11.
Check fuse holders, breakers, and
X
contacts.
12.
Lubricate sequenced flasher position
X
timer.
5.14
Illuminated Signs
5.14.1
Preventive Maintenance Inspection Procedures. To perform PMI's on runway and
taxiway signs contained in Table 20, proceed as follows:
a) Daily Checks. Check that signs are illuminated. This should be accomplished
during hours of darkness, or low ambient light, because it is difficult to establish levels of
illumination in sunlight. Any mandatory signs must have lamps replaced immediately so that a
safety hazard is not caused. When replacing burned out lamps in a sign it is advisable to replace
all lamps at the same time.
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