UFC 3-535-01
17 November 2005
There are no monitoring requirements for the REIL system.
3-6.8
Compliance with International Standards
3-6.8.1
NATO
The uni-directional flashing lights meet the requirements of NATO STANAG 3316
except for the displacement distance from the runway edge and the aiming angle.
3-6.8.2
ASCC
This system meets the requirements of AIR STD 90/27, except for the distance from the
runway edge and the aiming angles.
3-7
PRECISION APPROACH PATH INDICATOR (PAPI) SYSTEM
3-7.1
Purpose
The PAPI is an unattended system that provides visual glide path guidance for landing
an aircraft.
3-7.1.1
For the US Army, a PAPI will be provided where one or more of the following conditions
exist:
3-7.1.1.1
The runway is used by turbojet or other aircraft with similar approach
guidance requirements.
3-7.1.1.2
The pilot of any type of aircraft may have difficulty judging the approach
due to inadequate visual guidance that may be experienced during an approach over
water or featureless terrain by day, or in the absence of sufficient extraneous lights in
the approach area by night.
3-7.1.1.3
If judging the approach is difficult due to misleading information such as
produced by deceptive surrounding terrain or runway slopes. The presence of objects in
the approach area may present a serious hazard if an aircraft descends below the
normal approach path, especially if there are no navigation aids to give warning of these
objects.
3-7.1.1.4
Physical conditions at either end of the runway present a serious hazard in
the event of an aircraft undershooting or overrunning the runway.
3-7.1.1.5
Terrain or prevalent meteorological conditions are such that the aircraft
may be subjected to unusual turbulence during approach.
3-7.2
Configuration
The standard PAPI system consists of a light bar with four light units (FAA L-880, per
AC 150/5345-28, Precision Approach Path Indicators (PAPI) Systems) placed on the
left side of the runway in the vicinity of the touchdown point. (See Figure 3-12.)
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