AD 2008-21-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Beechcraft | Corporation Model 390 | Airworthiness Directives; Hawker Beechcraft Corporation Model 390 Airplanes |
Unsafe Condition
Incorrectly connected barometric pressure switches or inadvertently disconnected terminals on the cabin barometric pressure switch and cabin altitude high switch may result in no CABIN ALT HI annunciation and no automatic deployment of cabin oxygen masks.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Modify the cabin barometric pressure switch and cabin altitude high switch installations, and perform a functional test of the switches and related systems.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 25 hours time-in-service after October 20, 2008, or within 30 days after October 20, 2008.
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Affected Aircraft
Hawker Beechcraft Corporation Model 390 airplanes, serial numbers RB-1 and RB-4 through RB-238.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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