MALMS Mobile allows for the rapid and accurate testing of the light output of both in-pavement and elevated runway lighting fixtures.
ICAO states regular photometric measurements are the only practical way of determining if the lights are emitting the specified amount of light and for determining misalignment errors. By the use of regular photometric measurements, maintenance of runway lighting fixtures may be targeted only where needed thereby saving resources and time while allowing the airport to be assured of meeting light output specifications, especially in low-visibility conditions. This aids in providing a consistent lighting pattern to provide the pilot with the best possible, non-ambiguous visual cues when landing.
The Necessary frequency of photometric measurements will vary from facility to facility and from runway to runway depending on amount of traffic and age of fixtures. After experience has been gained with the measurement equipment, inspection schedules may be determined or modified. Due to the susceptibility of runway centerline lights to accumulate rubber deposits on the lens, weekly checks may be necessary. This is especially true for CAT II and CAT III runways where low-visibility operations are conducted.
Any in-pavement runway light exhibiting a light output of less than 70% of the minimum output required when operated at maximum intensity per ICAO Annex 14 or FAA AC 150/5345-46, Specification for Runway and Taxiway Light Fixtures should be targeted for cleaning or maintenance. Photometric testing should be performed: (1) Before cleaning or re-lamping, to establish what maintenance is necessary, and (2) After cleaning, or other maintenance actions, to track the effectiveness of the maintenance and determine the extent of degradation of the optical assembly. Lights that continue to exhibit output minimum levels should be scheduled for removal and servicing.