AD 2019-14-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
structural fatigue cracks can develop in certain aluminum pressure module check valves prior to the design limit, causing separation of the check valve head from the check valve body when hydraulic pressure is applied, resulting in injuries to maintenance personnel.
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Required Actions
an inspection to determine the part numbers of the four hydraulic systems A and B pressure module check valves and applicable on-condition actions, including replacement of Parker pressure module check valves, P/N H61C0552M1, with Crissair pressure module check valves, P/N 1C4196.
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Compliance Time
Within 50 flight hours
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Affected Aircraft
all The Boeing Company Model 737 series airplanes
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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