AD 91-14-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron Aviation Inc. | BH.125 Series 600A | BRITISH AEROSPACE Model HS.125-600A, BH.125-600A and HS.125-700A Series Airplanes |
| aircraft | Textron Aviation Inc. | HS.125 Series 600A | BRITISH AEROSPACE Model HS.125-600A, BH.125-600A and HS.125-700A Series Airplanes |
| aircraft | Textron Aviation Inc. | HS.125 Series 700A | BRITISH AEROSPACE Model HS.125-600A, BH.125-600A and HS.125-700A Series Airplanes |
Unsafe Condition
Loss of the standby constant frequency power system which provides the necessary back-up capability when the primary power system fails.
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Required Actions
Install a partial cover above the standby inverter 'TF' located between frames 22 and 23 LH if the converter is installed as depicted on pages 5-6 of the service bulletin. Compliance must be in accordance with British Aerospace Service Bulletin 24-279-3255A dated November 16, 1990.
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Compliance Time
within 160 days after the effective date of this AD, unless previously accomplished
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Affected Aircraft
Model HS.125-600A and BH.125-600A series airplanes (Post Modification 252475) and Model HS.125-700A series airplanes (Post Modification 252509)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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