Fuel - Fuel Quantity Indicating System Tank Unit - Inspection
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of affected Boeing 737-800 airplanes must perform the detailed inspection as specified in Aviation Partners Boeing Service Bulletin AP737-57-020 by December 30, 2019. If clearance issues are found, repairs must be completed promptly. Stakeholders should obtain the service information and coordinate with Aviation Partners Boeing for warranty and repair details.
Summary
Federal Register Volume 84, Number 227 (November 25, 2019) - Airworthiness Directive 2019-22-06 is a final rule issued by the FAA affecting certain Boeing 737-800 series airplanes modified with split winglets per STC ST00830SE. This directive addresses inadequate clearance between the fuel quantity indicating system (FQIS) tank unit and a reinforcement angle added during the split winglet modification, which could pose a fire risk.
What changed
This new airworthiness directive requires a detailed inspection to measure the clearance between the FQIS tank unit and the reinforcement angle on affected Boeing 737-800 airplanes. If insufficient clearance is found, repairs including trimming the reinforcement angle must be performed. The directive clarifies applicability to specific line numbers and removes certain provisions related to Organization Designation Authorization (ODA) authority.
Why it matters
This directive is critical for aviation professionals because inadequate clearance between the FQIS tank unit and reinforcement angle can create a potential ignition source inside the fuel tank, risking fire, overpressure, structural failure, and possible loss of the airplane. Operators and maintenance organizations must ensure compliance to maintain aircraft safety and regulatory conformity.
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