AD 2018-06-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Honda | Aircraft Company LLC Model HA-420 | Airworthiness Directives; Honda Aircraft Company LLC |
Unsafe Condition
The power brake valve (PBV) housing design drawing dimension for a bore diameter, which serves as an O-ring gland outer diameter, is oversized from Society of Automotive Engineers (SAE) specification guidelines for O-ring gland dimensions. This allows back-up ring extrusion damage during normal operating hydraulic pressure in the valve, O-ring deformation/damage, and internal leakage of hydraulic pressure within the PBV from the master cylinder brake lines.
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Required Actions
Inserting a temporary revision into the airplane flight manual, which may be performed by the owner/operator (pilot) holding at least a private pilot certificate, and replacing the installed PBV, P/N HJ1-13243-101-005 or P/N HJ1-13243-101-007, with an improved PBV, P/N HJ1-13243-101-009, if a defective PBV is detected during the required pilot checks as specified in the temporary revision.
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Compliance Time
Before further flight
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Affected Aircraft
Honda Aircraft Company LLC Model HA-420 airplanes
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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