# Airworthiness Directives; Airbus Helicopters Deutschland GmbH (AHD) Helicopters
> **Rule** · Final rule; request for comments. · Published 2026-09-28 · Effective 2026-10-13 · 91 FR 61113
## Document
- **Document number:** 2026-19757
- **Category:** airworthiness
- **Manufacturer:** Airbus
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 91 FR 61113
- **Publication date:** 2026-09-28
- **Effective date:** 2026-10-13
- **FAA docket:** Docket No. FAA-2026-11786
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Airbus Helicopters Deutschland GmbH (AHD) Model EC135P1, EC135P2, EC135P2+, EC135P3, EC135T1, EC135T2, EC135T2+, EC135T3, and EC635T2+ helicopters. This AD was prompted by a determination that in cases of loss of oil from the main gearbox (MGB), the low pressure caution or warning light might not activate. This AD requires revising the existing rotorcraft flight manual (RFM) for the helicopter by incorporating updated emergency, malfunction, and normal procedures. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2026/09/28/2026-19757/airworthiness-directives-airbus-helicopters-deutschland-gmbh-ahd-helicopters)
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