# Federal Register #2026-19757

FAA Airworthiness Directive: Rotorcraft Flight Manual Update for Airbus EC135/EC635T2+ Helicopters

**Buyer:** Federal Aviation Administration
**Posted:** September 28, 2026
**Respond By:** November 13, 2026
**Identifier:** 2026-19757
**NAICS:** 541690

This opportunity concerns a new airworthiness directive (AD) issued by the Federal Aviation Administration (FAA) for Airbus Helicopters Deutschland GmbH (AHD) EC135 and EC635T2+ helicopter models.
- Government Buyer:
  - Federal Aviation Administration (FAA), Department of Transportation
- OEM Highlight:
  - Airbus Helicopters Deutschland GmbH (AHD) is the only OEM referenced
- Scope of Directive:
  - Applies to all AHD Model EC135P1, EC135P2, EC135P2+, EC135P3, EC135T1, EC135T2, EC135T2+, EC135T3, and EC635T2+ helicopters
- Requirement Details:
  - Operators must revise the rotorcraft flight manual (RFM) for these models
    - Incorporate updated emergency, malfunction, and normal procedures
    - Addresses risk that main gearbox (MGB) oil loss may not trigger warning lights, potentially leading to undetected oil loss and loss of helicopter control
    - Revision can be performed by the pilot and must be recorded in maintenance logs
  - No procurement of products, hardware, or parts is required
- Quantities:
  - 106 helicopters affected (based on service line item quantity)
- Unique/Notable Requirements:
  - Compliance required within 14 days or 50 flight hours after directive effective date
  - This is a procedural update, not a material purchase

### Description

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. The AD requires revising the existing rotorcraft flight manual (RFM) by incorporating updated emergency, malfunction, and normal procedures to address this unsafe condition and prevent potential failure of the MGB and loss of control of the helicopter.

[View original listing](https://www.federalregister.gov/documents/2026/09/28/2026-19757/airworthiness-directives-airbus-helicopters-deutschland-gmbh-ahd-helicopters)