AD 76-13-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron Aviation Inc. | 58 | Airworthiness Directives; BEECH Models E55, E55A, 58 and 58A, B60, BH125-600A Airplanes |
| aircraft | Textron Aviation Inc. | 58A | Airworthiness Directives; BEECH Models E55, E55A, 58 and 58A, B60, BH125-600A Airplanes |
| aircraft | Textron Aviation Inc. | B60 | Airworthiness Directives; BEECH Models E55, E55A, 58 and 58A, B60, BH125-600A Airplanes |
| aircraft | Textron Aviation Inc. | BH.125 Series 600A | Airworthiness Directives; BEECH Models E55, E55A, 58 and 58A, B60, BH125-600A Airplanes |
| aircraft | Textron Aviation Inc. | E55 | Airworthiness Directives; BEECH Models E55, E55A, 58 and 58A, B60, BH125-600A Airplanes |
| aircraft | Textron Aviation Inc. | E55A | Airworthiness Directives; BEECH Models E55, E55A, 58 and 58A, B60, BH125-600A Airplanes |
Unsafe Condition
The unsafe condition involves improper recessing of bolt heads in terminal block assemblies and cracked or broken insulator strips, which could lead to complete loss of electrical power or damage to the engine firewall.
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Required Actions
Inspect terminal block assemblies on specified locations, rework or replace terminal blocks if bolt heads are not properly recessed (0.010 to 0.070 inches below flush), replace cracked or broken insulator strips with Beech P/N 103-26 or equivalent phenolic material, and reinstall components following procedures.
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Compliance Time
within the next 100 hours' time in service after the effective date of this AD, or at the next 100 hour, annual or progressive inspection after the effective date of this AD, whichever alternative occurs first
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Affected Aircraft
BEECH Models E55, E55A, 58, 58A, B60, BH125-600A with specific serial ranges: E55/E55A (TE-969-TE-1009, TE-1011-TE-1021, TE-1023-TE-1029, TE-1032-TE-1034), 58/58A (TH-441-TH-482, TH-484-TH-541, TH-484-TH-541, TH-543-TH-547, TH-549-TH-555, TH-557-TH-595, TH-597-TH-602, TH-604, TH-605, TH-607, TH-609), B60 (P-272-P-307, P-309-P-326, P-328-P-330), BH125-600A (256001, 256002, 256004, 256007, 256009, 256010, 256011, 256013, 256014, 256016, 256018, 256020, 256022, 256023, 256032, 256034)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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