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 MIL-HDBK-1023/4
(d) Advance the brightness selector switch to any step.
(e) The open-circuit protective device should automatically operate within 2
seconds to turn off the regulator.
(f) Turn off the selector switch. The open-circuit protective device should
reset. Turn the selector switch to any step. The regulator should turn on, then off again, within 2
seconds.
(g) If the test is satisfactory, turn off regulator power and reconnect the output
cables.
d) Unscheduled Check. Clean rust spots on the equipment and repaint as
necessary.
Table 12
Preventive Maintenance Inspection Schedule for
Constant Current Regulators
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 circuits on all brightness steps.
X
2. Check input voltage and current.
X
3. Check the regulator load.
X
4. Check the output current on each brightness step.
X
5. Check relays, wiring, and insulation.
X
6. Check dielectric strength of cooling oil (if used).
X
7. Perform a short-circuit test.
X
8. Perform an open-circuit test (only on regulators with open-circuit
X
protective devices).
9. Clean rust spots and paint as necessary.
X
5.7
Centerline and Touchdown Zone Lighting Systems
5.7.1
Preventive Maintenance Inspection Procedures. Because in pavement lights are
installed in the aircraft traffic area and are run over by aircraft, they are high maintenance items
that require frequent attention to maintain specified performance. Additionally, their location
below ground level make them prone to water filtration; this also requires frequent attention.
These problems should be remembered when performing the PMIs contained in Table 13 and
described below.
a) Daily Check. A driving patrol should be made daily at twilight. The inspector
should look for burned-out or dimly burning lamps and record their location.
53
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