AD 94-20-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron Aviation Inc. | 1900 | Airworthiness Directives; Beech Aircraft Corporation 1900 Series Airplanes |
| aircraft | Textron Aviation Inc. | 1900C | Airworthiness Directives; Beech Aircraft Corporation 1900 Series Airplanes |
| aircraft | Textron Aviation Inc. | 1900C (C-12J) | Airworthiness Directives; Beech Aircraft Corporation 1900 Series Airplanes |
| aircraft | Textron Aviation Inc. | 1900D | Airworthiness Directives; Beech Aircraft Corporation 1900 Series Airplanes |
Unsafe Condition
The hot battery bus bar was wrongly installed on the lower (load) side of the hot battery bus fuse assembly instead of the upper (power) side, resulting in a single five amp fuse supplying power to all systems connected to the bus, which could lead to loss of electrical power to emergency equipment such as engine fire extinguisher bottles, firewall shutoff valves, cockpit emergency lighting, and engine fire extinguisher indicator lights.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect the hot battery bus fuse assembly for proper wiring, correct the wiring if incorrect prior to further flight, and modify the wiring to add a redundant power source for the hot battery bus as specified in Beech Service Bulletin No. 2562.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 50 hours time-in-service after the effective date of this AD, unless already accomplished
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Affected Aircraft
Beech Aircraft Corporation models 1900 (UA-2 and UA-3 serial 1901), 1900C (UB-1 through UB-74 and UC-1 through UC-174), 1900D (UE-1 through UE-87), and C-12J (UD-1 through UD-6)
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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