# Federal Register #FAA-2026-11787

FAA Airworthiness Directive: Engine Compartment Firewall Modification for Airbus Helicopters

**Buyer:** Federal Aviation Administration (FAA), Department of Transportation
**Posted:** September 28, 2026
**Respond By:** November 12, 2026
**Identifier:** FAA-2026-11787
**NAICS:** 336413

This opportunity involves a proposed airworthiness directive from the Federal Aviation Administration (FAA) targeting Airbus Helicopters models.
- Government Buyer:
  - Federal Aviation Administration (FAA), Department of Transportation
  - Aircraft Certification Service, Compliance & Airworthiness Division
- OEM Highlight:
  - Airbus Helicopters
- Products/Services Requested:
  - Modification of engine compartment firewalls for 43 U.S. helicopters
  - Installation of angle-brackets along firewalls to improve sealing between seals and engine cowling
  - No specific part numbers provided; modification is based on EASA AD 2026-0056
- Notable Requirements:
  - Focus on safety and compliance with international airworthiness standards
  - Estimated cost up to $32,870 per helicopter
  - Addresses gaps that could allow fire propagation and reduce fire extinguishing effectiveness
- Estimated Contract Value:
  - Total estimated value ranges from $1,413,410 to $1,413,410 (43 helicopters x $32,870)
- Period of Performance:
  - Comments due by the specified deadline; no contract period or option years detailed

### Description

The FAA proposes a new airworthiness directive (AD) for all Airbus Helicopters Model AS 365 N2, AS 365 N3, EC 155 B, EC 155 B1, SA 365 N, and SA 365 N1 helicopters. This AD addresses gaps between the seals and engine cowling found during an investigation related to an engine compartment fire, which could lead to fire propagation and reduced effectiveness of the extinguishing agent. The directive requires modifying the engine compartment firewalls by installing angle-brackets along the firewalls to improve sealing and prevent unsafe conditions. Comments on this proposal are due by November 12, 2026.

[View original listing](https://www.federalregister.gov/documents/2026/09/28/2026-19729/airworthiness-directives-airbus-helicopters)