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Service Bulletin 73

GLASAIR GlaStar · Service Bulletins

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Overview

This service bulletin addresses the inspection and proper routing of the Garmin Autopilot cable for Sportsman and GlaStar aircraft equipped with Garmin GSA 28 Autopilot Servos. It highlights the importance of ensuring the cable ball position and routing to prevent potential binding of flight controls.

  • Applicable to all Sportsman and GlaStar aircraft with Garmin GSA 28 Autopilot Servos.
  • Inspect the servo capstan cable routing and cable ball location before the next flight.
  • Inspection ports in seat pans allow for easier cable routing checks.
  • One full wrap of cable is required when exiting in the opposite direction.
  • The capstan can rotate a maximum of 150 degrees in either direction.
  • If cables are improperly routed, they may be non-reusable.
  • New servo cables can be ordered from Trutrak Flight Systems.
  • Refer to the Garmin installation manual for detailed instructions.

Document

Source

Originally published by glasairaviation.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.

View original at glasairaviation.com

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Document details

Type
·
Service Bulletins
Year
·
2016
File size
·
16 KB
Publisher
·
glasairaviation.com
Language
·
en
About this document
What is the Service Bulletin 73?

The Service Bulletin 73 is a service bulletins for the GLASAIR GlaStar, dated 2016.

Where does the Service Bulletin 73 come from?

This copy of the Service Bulletin 73 was originally published by glasairaviation.com and is hosted on Sprinkle as a free, searchable reference copy.

What year was the Service Bulletin 73 published?

The Service Bulletin 73 — the GLASAIR GlaStar service bulletins on file — is dated 2016.

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In this document

Subject

Garmin Autopilot cable ball position and cable routing.

Applicability

All Sportsman and GlaStar Aircraft equipped with Garmin GSA 28 Autopilot Servos.

Compliance Time

Before next flight.

Required Action

Inspect the servo capstan cable routing and cable ball location.

Cable Routing Instructions

Details on cable exit direction and positioning of the ball socket.

Ordering New Cables

Contact Trutrak Flight Systems for new servo cables if needed.

Safety notes

  • Improper cable routing may cause flight control binding.
  • Inspect cables before the next flight to ensure safety.
  • Cables may be non-reusable if trimmed incorrectly.

Full document text

Model: Sportsman & GlaStar Document: Service Bulletin 73 Revision: - Date: 10-31-16 Page: 1 of 1 Service Bulletin 73 Subject: Garmin Autopilot cable ball position and cable routing. Applicability: All Sportsman and GlaStar Aircraft equipped with Garmin GSA 28 Autopilot Servos Compliance Time: Before next flight Discussion and Background Information: There has been a report of an autopilot cable unwinding from the capstan on a Garmin GSA 28 Autopilot Aileron Roll Servo. The swaged ball may come loose from the capstan and bind in the cable guide causing the flight controls to bind. Required Action: Before your next flight inspect the servo capstan cable routing and cable ball location. If you have the inspection ports in the seat pans you will be able to see the routing of the autopilot cables without removing the seat pans. If you do not have the inspection ports you must remove the seat pans to determine the routing of the cables and the position of the cable ball. From the Garmin GSA 28 Autopilot installation instructions: CABLE EXITING IN OPPOSITE DIRECTION: ONE FULL WRAP OF CABLE IS REQUIRED. BALL SHOULD BE IN CENTER OF CABLE WRAP WHEN CABLE IS AT CENTER OF TRAVEL. THE CAPSTAN MAY ROTATE A MAXIMUM OF 150 DEGREES IN EITHER DIRECTION, ALLOWING A MAXIMUM OF 2.6” OF TRAVEL IN EACH DIRECTION. With the control stick in the neutral position for roll the ball socket should be at the top of the roll servo capstan with the cables exiting on the bottom with 1 complete revolution of the cable around the capstan. With the control stick in the neutral position for pitch the ball socket should be at the bottom of the pitch servo capstan with the cables exiting on the top with 1 complete revolution of the cable around the capstan. If your autopilot servo cables are not routed as described they may have been trimmed in such a way that they are not reusable. If you find that the cable is short a new servo cable can be ordered directly from Trutrak Flight Systems at 479-751-0250 See attached figure 15-8.4 from Revision Z PN 190-01115-01 G3X/G3X Touch Installation Manual – GSA 28 Installation Page 15-18. Link to Garmin installation manual is http://static.garmin.com/pumac/190-01115-01_Z.pdf

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