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(2022) Service Advisory 22019 Rev A: Manifold Pressure Markings

PRODUCTS AFFECTED:

Garmin G500/G600 TXi display systems with the following are affected:

  • G500/G600 TXi software versions 3.02 through 3.22
  • Installed on aircraft that has two piston engines
  • TXi Engine Indication System (EIS) is installed
  • Engines have manifold pressure markings that vary based on engine speed
  • Optional TXi ‘dynamic’ manifold pressure gauge markings are configured to automatically adjust with engine speed

Do the following to confirm applicability:

  1. Perform a normal runup with both engines above 2100 RPM.
  2. Slowly reduce the speed of only the left engine and observe the markings on the manifold pressure gauges.

If the left and right manifold pressure gauge markings change simultaneously, this Service Advisory applies.

If only the left manifold pressure gauge marking changes, this Service Advisory does not apply.

If no change to either manifold pressure gauge marking, this Service Advisory does not apply.

ISSUE:

The left engine’s RPM is used to automatically adjust the manifold pressure markings for both engines.
When the engine speeds are not synchronized, the right engine’s manifold pressure marking may be erroneous.

NOTE
The indicated manifold pressures are correct and unaffected by this marking behavior.

ACTION:

Use the manifold pressure value to maintain the POH, AFM, or placarded limits. Do not rely on markings or annunciations.

RESOLUTION:

This issue was fixed in TXi software version 3.30. Refer to Garmin Service Bulletin 2174.

Attachments