190-01639-00
GSU 75 ADAHRS Installation Manual
Rev. 6
Page 3-4
3.5 GSU 75/GTP 59 Interconnect Harness Fabrication Instructions
Table 3-5 and Table 3-6 list the parts needed to install a GTP 59 into the GSU 75 interconnect harness.
Parts for this installation are included in the GTP 59 (Table 3-5) and GSU 75 (
) installation kits.
Some parts are to be provided by the installer.
Refer to
for the following instructions. To ensure adequate lightning protection, do not deviate
for GTP 59 mounting information.
1. Prepare surface–The metal body of the OAT sensor MUST be grounded to the aircraft. The instal-
lation requirements vary depending on the material composition of the airframe, the requirements
for aluminum and composite airframes are as follows:
a) Aluminum Airframe: Refer to the appropriate lightning certification document for zone
requirements to determine an acceptable mounting location for the sensor. At the sensor
mounting location, prepare the inside surface of the aircraft. Remove all paint from the
contacting area and clean with an appropriate degreaser.
b) Composite Airframe: Refer to the appropriate lightning certification document for zone
requirements and current levels to determine an acceptable mounting location for the sensor.
If possible, mount the sensor through a grounded metal strap or band. Otherwise, mount the
sensor in an area of the airframe that has a significant amount of underlying metal foil or
mesh. To ensure adequate conductivity for lightning currents, it may be necessary to mount
Table 3-5 Contents of GTP 59 Installation Kit (011-00978-00 )
Figure 3-2
Reference
Description
Qty.
Included
GPN or MIL spec
2
Ring Terminal
1
494-00022-08
3
3-cond., shielded, cable
4
GTP 59 Outside Air Temp (OAT) Sensor
5
Nut
1
210-00055-00
6
Washer
1
212-00026-00
10
Panhead Screw
2
211-60234-08
11
Pins #22 AWG
5
336-00021-00
Table 3-6 Parts needed for GTP 59 to GSU 75 Installation (see Figure 3-2)
Description
GPN MIL Spec
1
Shield Termination (method
optional)
Parts used depend on method
chosen
2, 3, 4, 5, 6, 10, 11
GTP 59 Sensor Kit
011-00978-00
8
16 AWG Pigtail Wire*
M22759/16-16
9
Ring Terminal*
MS25036-152
7, 12, 13
GSU 75 Connector Kit
011-03109-00
*Part supplied by installer
340095
The document reference is online, please check the correspondence between the online documentation and the printed version.
