190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 5-5
5.5 Unit Installation
Fabrication of a wiring harness is required. Sound mechanical and electrical methods and practices are
recommended for installation of the GAP 26. Refer to Section 2.3
for wiring considerations (-10 and -20
units only).
5.5.1 Mounting Location
• The GAP 26 is an under-wing mounted pitot/AOA probe, it is not intended for fuselage mount
applications. For proper functionality, the GAP 26 should be mounted in a location where airflow
over the probe is relatively undisturbed (typically mid-wing span).
• The tip of the GAP 26 should be located at least 4” from, but not more than 10” below the bottom
surface of the wing. The probe tip may protrude up to 2” max in front of the leading edge of the
wing.
• Viewed from the side, the GAP 26 probe bayonet centerline should be mounted within ±5° from
parallel to the wing chord line.
• Viewed from the top, the GAP 26 bayonet centerline should be mounted within ±5° from parallel
with the aircraft centerline.
• Consider using the aircraft designer/manufacturer’s recommended mounting location (if
specified). Optimal AOA functionality results when the tip of the GAP 26 probe is located no
further back than 25% of the wing chord length from the leading edge. (See Figure 5-4
)
• The 3/16” diameter aluminum pneumatic tubing is intended to be hand bendable to suit various
mounting configurations. Minimum allowable bend radius is 1.5”. It is recommended to bend any
given section only once to prevent work hardening and cracking of the aluminum tubing.
• Garmin recommends the GAP 26 not be used on aircraft where the ship static pressure port is
located under the wing (due to the likelihood the AOA measurement will be significantly
impacted). If the static port is located under the wing, it is recommended the port be moved to an
alternate location as part of the GAP 26 installation. If port relocation is required, obtain guidance
from the aircraft designer regarding acceptable alternate static port locations.
• Route all GAP 26 power and ground wires away from any audio wires.
• To avoid magnetic interference, do not use the airframe to ground the GAP 26 or any other high-
current device. See Section 14.4
for further magnetometer installation considerations.
Figure 5-4 GAP 26, Mounting Location Guidance
2" MAX ALLOWABLE TIP LOCATION
AHEAD OF WING LEADING EDGE
CHORD LENGTH
25%
OF CHORD LENGTH
4" MIN CENTERLINE
DISTANCE
10" MAX CENTERLINE
DISTANCE
5° MAX
ANGLE BETWEEN CHORD
LINE AND PROBE CENTERLINE
CHORD LINE
WING LEADING EDGE
GARMIN RECOMMENDED
FARTHEST AFT PROBE TIP LOCATION
PROBE CENTERLINE
GARMIN RECOMMENDED
FARTHEST FORWARD PROBE TIP LOCATION
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