Operating and Maintenance Manual
PAPI 400
6
4.2 Photometric characteristics
The photometric characteristics of lights are in accordance with the requirement of ICAO
and FAA specification as follows.
Type of
lights
Direction of light
Color
Main beam angle
Minimum beam
intensity
Vertical
Horizontal
PAPI
Uni-directional
RED
2
4
6
8
2
2.5
3
3.5
15,000cd
10,000cd
7,000cd
4,000cd
*The intensity of white color is between 2 and 6.5 times of red color with tilt switch
4.3 Mechanical characteristics
The mechanical characteristics are as follows.
- Net weight :
- In carton box :
- Gross weight :
4.4 Construction quality
4.4.1 A single lightweight aluminum box housing all the optical components
4.4.2 A lightweight single cover with padlockable latches
4.4.3 The optical groups shall consist each of:
- Tungsten halogen lamp, prefocused
- 99.99% pure aluminum reflector, polished and protected by anodic oxidation.
- Through-colored red glass filter
- Two high quality lenses in each beam to provide a constant transition zone which will
not overpass 3 minutes of arc in any case.
- Independent modules (one per channel) will not be permitted. Only (three lamp) single
unit shall be accepted.
4.4.4 A removable front glass in order to protect the lenses. No dispersive glass shall be
set in the light path.
4.4.5 Gaskets for cover and front glass.
4.4.6 Four adjustable mounting legs allowing the accurate setting of the unit. These legs
will allow the adjustment in elevation of the transition zone betw. They will also allow
the adjustment of the eight of the axis of the beam above the mounting concrete slab.
4.4.7 Breakable couplings with 2 inch 11 TPI thread and mounting flanges.
