Instruction manual

AM.11.100e edition 1.4
Chapter 3: Maintenance 22
Workshop maintenance and preventive maintenance,
continued
In the table below you will find a checklist of preventive maintenance tasks: In
case lights are found to be defective during the warranty period, do not open them
as explained below, but replace them by new units, and send the defective ones,
unopened, to ADB.
Interval Check Action
Daily for lamp failure Replace lamp and film disc cut-out (if any).
for low light output 1. Clean outer surface of prism if dirty.
2. Check for misalignment or presence of moisture
in fixture.
3. Check for lamp ageing or displacement
Weekly for obstruction in light output
channel
Clean channel and prism surface
Monthly * for presence of moisture or
water (visual inspection on
condensation inside of
prisms)
1. Open up light assembly.
2. Clean, dry and inspect.
3. Replace O-ring and other parts found defective
Bimonthly torque on hold-down bolts Refer to the paragraph " How to mount the light
assembly?", page 17, for the tool to use, the
requirement for use of Loctite and the torque to
apply.
Semi-annually * for presence of water in
base
1. Pump water from base.
2. Remove, dismantle and inspect light for water
damage.
3. Cure the cause of water ingress
After 800 hours
of operation at
6.6 A
Replace lamps of complete
subsystem
It is recommended to replace the lamps
systematically when 80 % of the useful life has
been reached. At full brightness (6.6 A), it
represents 800 hours, but, in practice, life spans of
2000 to 4000 hours can be expected.
After snow
removal
for damaged light fixtures 1. Replace badly damaged fixtures.
2. Use a power broom for snow removal in the
vicinity of the light fixture, if practical.
3. Follow recommended snow removal techniques
described in FAA AC 150/5200-30 to avoid or at
least to reduce damage to light fixtures.
* More frequently during rainy seasons.
Preventive
maintenance
tasks