Airworthiness DirectiveEASA AD US-2019-03-26

Superseded by FAA AD 2021-26-17

Published: Apr 2, 2019
Effective: Apr 8, 2019
Deadline: Apr 8, 2019

Boeing 737 600 700 700C 800 900

AI-generated summary of the official EASA document. Verify against the PDF before acting.

What to do

Operators of affected Boeing 737 models must modify PSUs and life vest panels as specified, including lanyard replacement, measurement, and marking, by the effective date. They should consult Boeing Service Bulletin 737-25-1707, Revision 1, dated May 18, 2018, for detailed instructions. Compliance with this AD is mandatory by April 8, 2019, and operators should verify that all installed PSUs have serviceable lanyard assemblies marked accordingly.

Summary

FAA Airworthiness Directive 2019-03-26 is a final rule addressing certain Boeing 737-600, -700, -700C, -800, -900, and -900ER series airplanes. It mandates modifications to passenger service units (PSUs) and life vest panels to prevent detachment during accidents by replacing and installing new lanyards and inspecting torsion spring assemblies. This directive aims to enhance passenger safety by ensuring PSUs remain securely attached during emergencies.

What changed

This directive introduces requirements to modify PSUs and life vest panels by removing existing inboard lanyards, installing two new outboard lanyards, measuring torsion spring hook distances, replacing discrepant lanyard assemblies, and marking serviceable lanyards. It expands applicability to all affected Boeing 737 models without Boeing Sky Interior and clarifies inspection and installation procedures. The directive also responds to public comments by maintaining the marking requirement and clarifying cost estimates.

Why it matters

This AD is critical for aviation professionals as it addresses a safety risk where PSUs could detach during accidents, potentially causing passenger injuries and obstructing evacuation. Operators and maintenance teams must ensure compliance to maintain aircraft airworthiness and passenger safety. The directive prevents installation of non-compliant lanyard assemblies and ensures consistent inspection standards across the fleet.

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