AD 78-08-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron Aviation Inc. | BH.125 Series 600A | Airworthiness Directives; HAWKER SIDDELEY AVIATION LIMITED Model BH/HS 125-600A Airplanes |
| aircraft | Textron Aviation Inc. | HS.125 Series 600A | Airworthiness Directives; HAWKER SIDDELEY AVIATION LIMITED Model BH/HS 125-600A Airplanes |
Unsafe Condition
Possible inability to activate the engine blow-off valve switches in the event that birds are ingested into the engines on take-off.
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Required Actions
Remove existing switch guards for the engine blow-off valve switches and replace with new design guard P/N 25-6 NF 2629 in accordance with Hawker Siddeley Aviation, Ltd. Service Bulletin 75-3(2580) or FAA-approved equivalent.
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Compliance Time
within one month after the effective date of this AD
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Affected Aircraft
HAWKER SIDDELEY AVIATION LIMITED Model BH/HS 125-600A airplanes, certificated in all categories.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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