Airworthiness DirectiveEASA AD US-2019-08-03

Fuselage - Section 43 Lower Lobe Frames - Inspection

Published: Jun 4, 2019
Effective: Jun 17, 2019
Deadline: Jun 17, 2019

Boeing 737 100 200 200C 300 400

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What to do

Operators of affected Boeing 737-100 through -500 series airplanes must perform repetitive detailed, general visual, and high frequency eddy current inspections of the section 43 lower lobe frames from station 380 to 520. They must also inspect for certain repairs and carry out any required on-condition actions. Compliance with this directive is mandatory starting June 17, 2019, and operators should refer to Boeing Alert Service Bulletin 737-53A1361 dated July 17, 2018, for detailed procedures.

Summary

Federal Aviation Administration Airworthiness Directive 2019-08-03 is a final rule addressing certain Boeing 737-100, -200, -200C, -300, -400, and -500 series airplanes. It mandates repetitive detailed, general visual, and high frequency eddy current inspections of the section 43 lower lobe frames between station 380 and station 520, as well as inspections to identify certain repairs and applicable on-condition actions. This directive aims to detect and mitigate frame web and integral inboard chord cracking below the passenger floor.

What changed

This new airworthiness directive introduces mandatory repetitive inspections of the lower lobe frames on specified Boeing 737 models to identify cracking and certain repairs. It also clarifies that installation of Supplemental Type Certificate ST01219SE does not affect compliance and updates terminology to align with current standards. The directive provides guidance on alternative methods of compliance and addresses comments received during the rulemaking process.

Why it matters

This directive is critical for aviation professionals because frame cracking in the lower lobe frames can lead to structural failure and potential uncontrolled decompression of the aircraft. Operators and maintenance organizations must ensure compliance to maintain airworthiness and safety. The inspections and on-condition actions help prevent costly repairs and enhance the longevity and safety of affected Boeing 737 aircraft.

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