Boeing 737 Owners Must Fix Fan Covers to Prevent Mid-Air Mishaps
Published Date: 3/4/2025
Rule
Summary
The FAA is making new safety rules for Boeing 737 airplanes after some engine parts fell off and caused serious problems. Owners must replace certain fasteners, modify parts around the engine starter vent, or install a safer fan cowl, plus update their maintenance checks. These fixes need to happen soon to keep flights safe and avoid costly repairs later.
Analyzed Economic Effects
3 provisions identified: 1 benefits, 2 costs, 0 mixed.
Mandatory Boeing 737 Fan Cowl Repairs
If you own or operate Boeing Model 737-600, -700, -700C, -800, -900, or -900ER airplanes, the FAA requires replacing fasteners on the fan cowl support beam hinge fittings for certain airplanes and, for all airplanes, modifying the radial restraint assembly and installing an external doubler at the starter vent or, alternatively, installing a serviceable fan cowl.
Reduces Risk of In-Flight Part Separation
The AD responds to two engine fan blade-out events that caused engine inlet cowl and fan cowl parts to separate; in one case parts damaged the fuselage, causing loss of pressurization and an emergency descent. The required modifications aim to prevent fan cowl separation and the associated safety incidents.
New Maintenance Program Requirements
Airplane operators must revise existing maintenance or inspection programs to incorporate new airworthiness limitations specified by the AD. These program changes apply as applicable to affected Boeing 737 models.
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