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P&WC

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P&WC Proprietary Information

AGENDA

Review

PT6A-27 Vs PT6A-34

Rating differences

Internal differences

Fuel System difference (Twin Otter Series 300 vs 400)

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PT6A-27 Vs PT6A-34OVERVIEW

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PT6A cross section

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PT6A-27 Vs -34 operating limits

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PT6A-27 no air cooled type guide vane

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PT6A-27 no air cooled type guide vane

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PT6A-34 air cooled type guide vane

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PT6A-34 air cooled type guide vane

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PT6A-27 vs -34 Power turbine differences

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PT6A-27 Vs -34 Fuel SystemTwin Otter Series 300 Vs 400

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PT6-27 & -34 fuel system with start flow controlTwin Otter 300 Series

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PT6-27 & -34 fuel system with start flow controlTwin Otter 300 Series

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PT6-27 & -34 fuel system with start flow controlTwin Otter 300 Series

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PT6-34 fuel system with flow dividerTwin Otter 400 Series

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PT6-34 fuel system with flow dividerTwin Otter 400 Series

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PT6-34 fuel system with flow dividerTwin Otter 400 Series

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PT6-34 fuel system conversion fromTwin Otter 300 Series to 400 Series

Fuel System must be converted from a ‘Start Flow Control” to “Flow divider”configuration when switching a PT6A-34 from an old Twin Otter Series 300to the New Twin Otter Series 400

P&WC do not have a Service Bulletin or kit to covert such conversion.

A list of affected components can be sent to customer and conversion canbe made using engine IPC.