Airworthiness DirectiveEASA AD 2015-0090R1

Engine Controls — Electrical Wiring Harness — Modification

Published: Jun 16, 2020
Effective: Jun 23, 2020
Deadline: Jun 5, 2015
Replaces: 2015-0090

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What to do

Operators must determine engine operating history and, if the engine has operated or operates in sandy environments or if history is unknown, install wire locks on the IGV/VSV connectors within 630 engine hours after 5 June 2015. After modification, wire locks must be installed whenever these connectors are disconnected and reconnected. Additionally, installing the SAFRAN service bulletin modification is an optional terminating action that satisfies the AD requirements. Engines without prior modification must not be installed on helicopters unless compliant with these requirements.

Summary

EASA Airworthiness Directive 2015-0090R1 is a regulatory update addressing the electrical wiring harness modification for SAFRAN Helicopter Engines RTM 322-01/9 and RTM 322-01/9A engines, commonly installed on NH Industries NH90 military helicopters. The directive mandates corrective actions to prevent failures related to the inlet guide vane and variable stator vane resolver connectors, which can cause engine control issues and potential in-flight shutdowns. This AD applies to all serial numbers except those with SAFRAN modification C3064 incorporated during production or the applicable service bulletin modification.

What changed

This revision of EASA AD 2015-0090 excludes engines with SAFRAN modification C3064 embodied in production from the original requirements and introduces an optional terminating action through a new SAFRAN service bulletin modification. It also includes editorial updates to align with current AD writing standards without altering the core requirements. The revised AD reflects the development of an improved ES2/3 harness with enhanced connectors to prevent the back-off issues previously identified.

Why it matters

This AD is critical for aviation professionals as it addresses a safety risk that could lead to uncommanded engine shutdowns and compressor surges during flight, especially in hot and sandy environments. Operators and maintenance organizations must ensure compliance to maintain engine reliability and airworthiness, thereby preventing emergency landings and potential injuries. Understanding and implementing these modifications is essential for continued safe operation of affected RTM 322 engines and associated helicopters.

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