190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 5-3
5.4 Mounting Requirements
• The GAP 26 pitot/AOA probe is intended to be installed in the same location as an existing
non-structural inspection panel on the aircraft wing. A replacement mounting plate that meets the
minimum requirements listed in this section may be fabricated to replace the existing inspection
panel or the existing inspection panel may be used with an added doubler plate (if needed) to meet
the minimum strength requirements listed below. If it is desired to use a structural panel to mount
the GAP 26, or to create a new mounting location by making a hole in the aircraft skin, a structural
analysis will be required to evaluate the affects of the installation on existing structure and the
installation will no longer be considered a minor alteration.
• The minimum thickness of the replacement mounting plate or inspection panel shall be .063”. If
the existing inspection panel is to be used, and it does not meet this minimum thickness
requirement, then a doubler plate shall be added between the inspection panel and the GAP 26
adjustable mount so the combined thickness meets or exceeds the minimum thickness require-
ment.
• A sheet metal template for the cutout and mounting holes has been included. Using this template
will provide required clearance to make the five degree adjustment after installation if needed. To
make the five degree pitch down adjustment, remove the leading edge mounting bolt where the
AN5812 Mast connects to the mounting bracket (see Figure 5-2
). Loosen the aft side mounting
bolt and turn the mast downward until the leading edge mounting hole aligns with the offset hole
provided on the mounting bracket. Install the leading edge mounting bolt with the mast in this
position and tighten the aft side bolt.
• If a doubler plate is required for the installation, refer to AC 43.13-1B, Chapter 4 for appropriate
fabrication and riveting methods. The doubler plate perimeter should be no further than 1.5” from
the centerline of the inspection panel mounting screws (see Figure 5-3
).
• The maximum hole spacing for the mounting plate screws shall be 2-3”. If the existing inspection
panel hole spacing is greater, a nut plate and screws (to match existing) shall be added to
accommodate this maximum spacing requirement.
• Screws of appropriate length for the specific installation shall be used to fasten the GAP 26
adjustable mount to the inspection panel (or combination panel and doubler). Required screw size
is #8-32. Screws shall meet MS24693 or equivalent. Locking nuts shall meet MS21044 or
equivalent. Washers shall meet NAS 1149 or equivalent.
• The GAP 26 is intended to be mounted in the supplied adjustable mount. If other mounting
methods are to be used the installer must follow installation guidance in AC 43.13-2B Chapters 1
and 3. In addition, the installer must show the installation is adequate for expected loading and
does not affect the surrounding structure of the aircraft.
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