AD/TPE 331/42 Amdt 1 - Torque Sensor - CANCELLED

This directive cancels a previous maintenance rule for certain aircraft engines.

What it does:

• Removes a requirement for owners of AlliedSignal (Garrett/AiResearch) TPE 331 turbine engines to replace a specific hydraulic torque sensor (part number 3101726-1).
• The original rule required this replacement during the next engine overhaul after January 1994, following procedures in specific service bulletins.

Who it affects:

• Aircraft operators and maintenance organisations using TPE 331 series engines (commonly found in regional turboprop aircraft).
• Specifically those who had not yet completed the torque sensor replacement mandated by the previous directive.

Why it matters:

• Eliminates a maintenance obligation that is no longer deemed necessary for airworthiness.
• Allows operators to avoid the cost and downtime of this specific sensor replacement.