Quantcast Table 8 Preventive Maintenance Inspection Schedule for Airport Lighting Vault

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MIL-HDBK-1023/4
Table 8
Preventive Maintenance Inspection Schedule for Airport Lighting Vault
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 control operation.
X
2.
Check general cleanliness.
X
3.
Check for moisture.
X
4.
Check screens on ventilators.
X
5.
Check vault.
X
6.
Check insulation resistance.
X
7.
Check input voltage.
X
8.
Check ground resistance.
X
9.
Inspect and clean buses.
X
10.
Check relay operation.
X
11.
Check oil fuse cutouts.
X
12.
Check oil switches.
X
13.
Operate power transfer switches.
X
14.
Check control panel.
X
15.
Check photoelectric switch.
X
16.
Check astronomic time switch.
X
17.
Check radio-control of lighting equipment.
X
18.
Check lightning arresters.
X
X
19.
Inspect miscellaneous electrical hardware (fans).
X
20.
Check oil dielectric.
X
21.
Paint equipment as necessary.
X
Table 9
Table of Initial Resistance Values Versus Circuit Length
Circuit length in feet
Suggested minimum resistance to
ground in megohms
10,000 or less
50
10,000-20,000
40
20,000 or more
30
43





 


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