MAINTENANCE MANUAL
Effectivity: All
Page 33-15
Edition 2 | Rev. 0
(5) Inspection / check – position / strobe lights
(a) Inspect the LED’s. If any one LED fails, the unit must be repaired or replaced.
NOTE
To reduce eye strain use an optical filter such as dark glasses
or a blue covering dome during LED inspection.
(b) Inspect the lens. Replace if there is excessive scratching, discoloration or cracking.
(c) Inspect the flashtubes of the strobe lights:
If the flashtube of the strobe light shows signs of any of these conditions, replace it.
1 The flashtube operates normally during daylight but it is difficult to switch it
on in the dim light. The flashtube may be photosensitive.
2 As a result of aging of the flashtube or exposure to a very high temperature,
the flashtube may be difficult to switch on. The flashtube, which is
sometimes difficult to switch on, starts to shine when the engine runs (the
lights are powered by the generator) but the light fades if the flashtube is
powered by a low battery.
3 The flashtubes may show signs of leakage through the glass tube of the
flashtube or around the seal of the wire on the glass. This leakage is caused
by rapid heating when the normally operating system of the strobe lights is
switched on, and slow cooling when the normally operating system of the
strobe lights is switched off.
4 The flashtubes may show signs of self-ionization (permanent blue light
emission) which means that the entire system of the strobe lights is not
functional until the respective flashtube is replaced. The self-ionization will
occur most likely when the input voltage is very high. This may be verified by
this procedure: switch the system of the strobe lights off and switch it on
again. After you switch the system on, it will usually operate normally during
several flashes before the self-ionization occurs again.
NOTE
Installation of one new flashtube in any multi-element system of
strobe lights sometimes causes the remaining old flashtubes to
fail or skip flashes. This may mean that the old flashtubes
approach the end of the service life. When you check the
problematic flashtubes, use reduced voltage - approximately 20
% at the input to the power source of strobe lights. If the
flashtube operates at this reduced voltage, the service life has
not expired yet.
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