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EASA Regulations for Boeing 737-400

45 airworthiness directives and regulations affecting Boeing 737-400.

EASA AD US-2022-21-05

Auto Flight - Auto-Throttle Computer - Built-in Test Equipment Tests

Airworthiness Directive 2022-21-05 is a final rule issued by the Federal Aviation Administration affecting certain Boeing 737-300, -400, and -500 series airplanes. It addresses a safety issue where a spoiler sensor failure may go undetected by the autothrottle computer, potentially leading to asymmetric thrust and uncommanded roll. The directive mandates repetitive built-in test equipment (BITE) tests of the autothrottle computer to detect and correct spoiler sensor failures.

Oct 28, 2022
Airworthiness DirectiveMaintenanceSafety MgmtBoeing 737Boeing 737-300Boeing 737-400Boeing 737-500

EASA AD US-2021-25-05

Fuselage - Crown Skin Panels - Inspection / Replacement

The Federal Aviation Administration's Airworthiness Directive 2021-25-05 addresses safety concerns for The Boeing Company Model 737-100, -200, -200C, -300, -400, and -500 series airplanes. This directive focuses on inspecting and replacing fuselage crown skin panels that are susceptible to widespread fatigue damage, which could compromise the structural integrity of the aircraft.

Jan 31, 2022
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EASA AD US-2021-26-03

Fuselage - Frame Splice - Inspection

The Federal Register Volume 87, Number 11 Airworthiness Directive 2021-26-03 is a final rule issued by the FAA that applies to certain Boeing 737-300, -400, and -500 series airplanes. It addresses widespread fatigue damage in the fuselage frame splice between stringers S-13 and S-14, requiring inspections and corrective actions to ensure structural integrity. This directive mandates inspections for existing repairs and repetitive high frequency eddy current inspections for cracking in the affected fuselage frame splices.

Jan 31, 2022
Airworthiness DirectiveMaintenanceSafety MgmtBoeing 737Boeing 737-300Boeing 737-400Boeing 737-500

EASA AD US-2021-10-11

Wings - Bulkhead Splice Angles - Inspection

The Federal Aviation Administration Airworthiness Directive 2021-10-11 addresses all Boeing 737-100, -200, -200C, -300, -400, and -500 series airplanes. It mandates repetitive surface high frequency eddy current inspections of the STA 540 bulkhead splice angles to detect cracks and requires corrective actions if cracks are found. This directive aims to maintain structural integrity and prevent potential fuel leaks and fires.

Jul 16, 2021
Airworthiness DirectiveMaintenanceSafety MgmtBoeing 737Boeing 737-100Boeing 737-200Boeing 737-200CBoeing 737-300Boeing 737-400Boeing 737-500

EASA AD US-2021-08-14

Auto Flight - Flap Position Sensor - Testing

Federal Register Volume 86, Number 94 (Tuesday, May 18, 2021) Final Rule titled 'Auto Flight - Flap Position Sensor - Testing' is an FAA Airworthiness Directive affecting all Boeing 737-300, -400, and -500 series airplanes. This directive addresses a flap synchro wire failure issue that may not be detected by the autothrottle computer, potentially compromising the asymmetric cruise thrust monitor function.

May 26, 2021
Airworthiness DirectiveMaintenanceSafety MgmtBoeing 737Boeing 737-300Boeing 737-400Boeing 737-500

EASA AD US-2021-08-12

Wings - Lower Aft Wing Skin Aft Edge - Inspection

The FAA Airworthiness Directive 2021-08-12 is a final rule addressing all Boeing 737-100, -200, -200C, -300, -400, and -500 series airplanes. It mandates repetitive inspections of the lower aft wing skin aft edge at specific flap track locations due to crack indications found in bolt holes where flap tracks attach to the track support fitting. The directive aims to ensure structural integrity by detecting and repairing cracks that could compromise the wing's ability to carry limit loads.

Apr 26, 2021
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EASA AD US-2020-26-09

Wings - Center Wing Box Fastener Holes - Inspection

FAA Airworthiness Directive 2020-26-09 is a final rule addressing all Boeing 737-100, -200, -200C, -300, -400, and -500 series airplanes. It mandates inspections of the center wing box fastener holes for cracks using high frequency eddy current, ultrasonic, or detailed internal inspection methods. The directive aims to maintain structural integrity by detecting and repairing cracks in critical wing components.

Jan 4, 2021
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EASA AD US-2020-26-04

Fuselage - Skin Panels - Inspection / Repair / Installation

Airworthiness Directive 2020-26-04 is a final rule issued by the FAA addressing certain Boeing 737-100, -200, -200C, -300, -400, and -500 series airplanes. It mandates inspections and repairs of fuselage skin panels, specifically targeting cracking along chem-milled lines. This directive updates and expands previous inspection requirements to ensure continued airworthiness.

Dec 22, 2020
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EASA AD US-2020-17-04

Equipment / Furnishings - Passenger Service Units and Lanyard Assemblies on the Life Vest Panels - Installation

The Equipment / Furnishings - Passenger Service Units and Lanyard Assemblies on the Life Vest Panels - Installation is a Federal Aviation Administration (FAA) Airworthiness Directive (AD 2020-17-04) that applies to certain Boeing 737-300, -400, and -500 series airplanes. This AD addresses the installation of lanyard assemblies on passenger service units (PSUs) and life vest panels to prevent detachment during survivable accidents. It supersedes a previous directive and mandates additional installation requirements for five specific airplanes.

Aug 26, 2020
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EASA AD US-2020-14-03

Wings - Strut to Wing Diagonal Brace & Nacelle Support Overwing Fitting - Inspection

Federal Aviation Administration Airworthiness Directive 2020-14-03 is a final rule addressing all Boeing 737-300, -400, and -500 series airplanes. It mandates inspections of the strut to wing diagonal brace and the nacelle support overwing fitting to detect fatigue cracking. The directive includes visual, ultrasonic, and magnetic inspections depending on airplane configuration to ensure structural integrity.

Aug 20, 2020
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EASA AD US-2020-16-51

[Final Rule] Pneumatic - Engine Bleed Stage 5 Check Valves - Inspection

The Final Rule titled 'Pneumatic - Engine Bleed Stage 5 Check Valves - Inspection' is an airworthiness directive issued by the FAA for all Boeing 737-300, -400, -500, -600, -700, -700C, -800, -900, and -900ER series airplanes. It mandates inspections and, if necessary, replacement of the engine bleed air 5th stage check valves on each engine due to reports of valves stuck open causing single-engine shutdowns. This directive addresses a critical safety risk related to potential dual-engine power loss.

Aug 11, 2020
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EASA AD US-2020-02-16

Fuselage - Lower Skin of the Fuselage Skin Lap Splices - Inspection

The Federal Aviation Administration's Airworthiness Directive 2020-02-16 is a final rule addressing certain Boeing 737-200, -200C, -300, -400, and -500 series airplanes. It mandates inspections of the lower skin of the fuselage skin lap splices along the lower fastener row of a specific stringer lap splice on certain body station skin panels due to potential widespread fatigue damage. The directive aims to detect and mitigate scratch cracks and fatigue cracking that could compromise structural integrity.

Feb 17, 2020
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EASA AD US-2019-23-16

Wings - Left and Right Upper Wing Skin - Inspection

The Federal Aviation Administration's Airworthiness Directive 2019-23-16 addresses all Boeing 737-100, -200, -200C, -300, -400, and -500 series airplanes. This directive mandates inspections of the left and right upper wing skin to detect cracks that could lead to fuel leaks and compromise structural integrity. It requires repetitive high frequency eddy current (HFEC) and general visual inspections along with necessary repairs.

Jan 29, 2020
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EASA AD US-2019-23-14

[Correction] Fuel - Maintenance or Inspection Program - Revision

Correction to FAA Airworthiness Directive 2019-23-14 concerning The Boeing Company Model 737-100, -200, -200C, -300, -400, and -500 series airplanes. This correction fixes an incorrect service information reference related to fuel tank ignition prevention and nitrogen generation system maintenance requirements. The directive mandates revisions to maintenance or inspection programs to incorporate updated airworthiness limitations.

Jan 17, 2020
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EASA AD US-2019-19-10

Airplane Flight Manual / Minimum Equipment List - Revision / Fuel Crossfeed Valve Operational Check

The Airplane Flight Manual / Minimum Equipment List - Revision / Fuel Crossfeed Valve Operational Check is a final rule airworthiness directive issued by the FAA affecting all Boeing 737-300 through 900ER series, 757, 767, 777, and 787-8 and 787-9 airplanes. It addresses reports of fuel crossfeed valves failing to open during flight, which could lead to fuel starvation and forced off-airport landings. The directive mandates revisions to the airplane flight manual and minimum equipment list to ensure operational checks of fuel crossfeed valves prior to extended operations (ETOPS) flights when certain valves or fuel balancing systems are inoperative.

Jan 14, 2020
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EASA AD US-2019-23-12

Wings - Fuel Tanks - Modification

Federal Register Volume 84, Number 236 (2019-23-12) is a final rule airworthiness directive issued by the FAA that applies to all Boeing 737-300, -400, and -500 series airplanes. It addresses fuel system safety by requiring modifications to the fuel tanks and associated components to prevent potential ignition sources. The directive mandates specific maintenance actions including applying sealant to fuel tank fasteners, replacing wire bundle clamps external to the fuel tanks, and installing Teflon sleeving under these clamps.

Jan 7, 2020
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EASA AD US-2019-16-12

Wings - Vertical Stiffeners - Installation / Replacement

Airworthiness Directive 2019-16-12 is a final rule issued by the Federal Aviation Administration (FAA) addressing The Boeing Company Model 737-100, -200, -200C, -300, -400, and -500 series airplanes. It mandates replacement of vertical stiffeners at left and right buttock line 6.15 on the rear spar of the wing center section, along with installation of angle and bonding jumpers, brackets, sealant, and paint. This directive responds to identified cracks in vertical stiffeners and potential ignition sources in the fuel tank due to degraded fault current bonding paths.

Sep 5, 2019
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EASA AD US-2019-14-15

Fuselage - Stub Beams - Inspection

Airworthiness Directive 2019-14-15 issued by the Federal Aviation Administration (FAA) addresses inspection requirements for the stub beams of the fuselage on all Boeing 737-100, -200, -200C, -300, -400, and -500 series airplanes. This directive mandates repetitive inspections for cracking in the webs and chords of the stub beams at specified fuselage stations, including new inspection locations, and requires applicable on-condition corrective actions to maintain airworthiness.

Aug 28, 2019
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EASA AD US-2019-13-02

Fuselage - Lower Lobe Skin Panel Assemblies - Replacement / Inspection

FAA Airworthiness Directive 2019-13-02 is a final rule addressing certain Boeing 737-200, -200C, -300, -400, and -500 airplanes. It mandates replacement and detailed inspections of the fuselage lower lobe skin panel assemblies due to reports of cracking and findings of widespread fatigue damage. This directive aims to maintain structural integrity and prevent decompression risks.

Jul 24, 2019
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EASA AD US-2019-09-01

Ice and Rain Protection - Pitot Anti-Icing System - Replacement / Test

Airworthiness Directive 2019-09-01 is a final rule issued by the Federal Aviation Administration addressing certain Boeing 737-100, -200, -200C, -300, -400, and -500 series airplanes. It mandates replacement and testing of the pitot anti-icing system components to prevent misleading air data caused by the pitot heat switch not always being set to ON. The directive also requires installation of a junction box and wiring provisions to enhance system reliability.

Jun 26, 2019
Airworthiness DirectiveMaintenanceSafety MgmtBoeing 737Boeing 737-100Boeing 737-200Boeing 737-200CBoeing 737-300Boeing 737-400Boeing 737-500