Pitot-Static Routing - Garmin GI 275 Installation Manual

4.2 Pitot-Static Routing

The GI 275 Primary ADI and/or standby displays must be connected to the aircraft pitot-static system using
lines and fittings, as specified in the model-specific aircraft parts manual. Lines must be labeled next to the
GI 275. When installing pneumatic lines and fittings:
CAUTION
Check connections for errors before operating the equipment. An incorrect connection can
result in equipment damage.
• Reference the aircraft manufacturer standard practices manual or equipment manufacturer
documentation for guidance. Methods, techniques, and practices defined in AC 43.13-1B
Chapter 12, Section 4, Pitot/Static Systems, are acceptable
• Do not route lines near moving components of the aircraft control systems, other systems with
moving components, or sources of heat, including high temperature lines
• The GI 275 must not be at a low point in the pitot-static system pneumatic lines
• The routing of the pneumatic lines from the GI 275 to the existing pitot-static system must
continuously slope down without low points until they connect to the existing pneumatic system
• If added pneumatic lines cannot be routed to continuously slope down, a "drain" must be installed
at the low point of each pneumatic line. The "drain" can be comprised of a TEE fitting
• Any added "drains" must be opened and discharged at least every 12 calendar months
• The performance of existing drains must remain unaffected by connected equipment
• Pitot and static ports mounted on the aircraft surface must not be changed or relocated. The aircraft
surface where these ports are located must remain undeformed and free from defects
When making pitot-static system connections:
• The GI 275 Primary ADI must be connected to pitot-static lines that were previously connected to
the pilot's instruments (primary source)
• In aircraft with a single pitot-static system:
◦ The standby instruments can be connected to the same pitot-static source as the pilot's
instruments
• For aircraft equipped with a dual pitot-static system:
◦ The standby instruments must be connected to the pitot-static source that is independent
from the pilot's instruments
Whenever the pitot-static system is modified, a Pitot-Static Leak Test must be performed. To perform the
test, follow the procedure outlined in the relevant aircraft maintenance manual. AC 43-6D, Appendix E, is
an acceptable means of compliance when no other manufacturer data is available.
NOTE
Aircraft must retain the alternate static source selector switch, if it was previously equipped.
190-02246-10
Rev. 11
GI 275 Part 23 AML STC Installation Manual
Page 4-5