AD 98-07-16
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 737-300 Series | Airworthiness Directives; Boeing Model 737-300, -400, and -500 Series Airplanes |
| aircraft | The Boeing Company | 737-400 Series | Airworthiness Directives; Boeing Model 737-300, -400, and -500 Series Airplanes |
| aircraft | The Boeing Company | 737-500 Series | Airworthiness Directives; Boeing Model 737-300, -400, and -500 Series Airplanes |
Unsafe Condition
The positioning of the flow limiter in the existing configuration and excessive fusing volumes of some hydraulic fuses in extreme cold environments can adversely affect the operation of the fuse, resulting in loss of all standby hydraulic system pressure and severely reduced controllability during certain flight phases.
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Required Actions
Interchange the location of the hydraulic fuse and flow limiter in the standby hydraulic system of the leading edge so that the fuse is upstream of the flow limiter. Replace existing hydraulic fuses with new fuses not adversely affected during low temperature operation.
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Compliance Time
Within 18 months or 4,000 flight hours after the effective date of this AD, whichever occurs later.
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Affected Aircraft
Boeing Model 737-300, -400, and -500 series airplanes affected by the configuration described in the AD.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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