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.
AI-generated summary from the source AD text. Verify against the official source before acting.
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.
AI-generated summary from the source AD text. Verify against the official source before acting.
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)
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Electrical Power
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_76-13-05.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 76-13-05 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; BEECH Models E55, E55A, 58 and 58A, B60, BH125-600A Airplanes Subject: Electrical Power Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 07/06/1976 Make: Textron Aviation Inc. Model: 58 | 58A | B60 | BH.125 Series 600A | E55 | E55A Product Type: Aircraft Product Subtype: Small/Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 76-13-05 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2653 AD NUMBER: 76-13-05 SUBJECT HEADING: Airworthiness Directives; BEECH Models E55, E55A, 58 and 58A, B60, BH125-600A Airplanes ACTION: SUMMARY: DATES: Effective July 6, 1976. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 76-13-05 BEECH: Amendment 39-2653. Applies to Models E55 and E55A (Serial Numbers TE-969 thru TE-1009, TE-1011 thru TE-1021, TE-1023 thru TE-1029 and TE-1032 thru TE-1034 airplanes; Models 58 and 58A (Serial Numbers TH-441 thru TH-482, TH-484 thru TH-541, TH-543 thru TH-547, TH-549 thru TH-555, TH-557 thru TH-595, TH-597 thru TH-602, TH-604, TH-605, TH-607 and TH-609) airplanes; Model B60 (Serial Numbers P-272 thru P-307, P-309 thru P-326, P-328 thru P-330), and Model BH125-600A (Serial Numbers 256001, 256002, 256004, 256007, 256009, 256010, 256011, 256013, 256014, 256016, 256018, 256020, 256022, 256023, 256032, and 256034) airplanes. Compliance: Required as indicated, unless already accomplished. To prevent complete loss of electrical power or damage to the engine firewall, either 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, accomplish the following: A) Inspect the terminal block assemblies and rework or replace where necessary in accordance with the following procedures: 1. Locate the terminal block assemblies mounted on: (a) The aft right side of the forward cabin bulkhead on Models E55, E55A, 58 and 58A. (b) The inboard side of the left nacelle firewall and the outboard side of the right nacelle firewall on Model B60. Both are on the forward side of the firewall. (c) The APU relay panel assembly and the right hand side of the horizontal cross member at frame 24 on Model BH125-600A. 2. Disconnect the battery and remove structure as necessary to gain access to the terminal block assemblies. 3. Remove the current limiters from the terminal block assemblies and then remove the terminal block assemblies. 4. Visually inspect the terminal block assemblies to determine if the bolt heads are properly recessed. A properly recessed bolt should be mounted from .010 inches to .070 inches below flush within the terminal block base. 5. If the bolt heads are not properly recessed, either remove the bolts and rework the holes to accept the bolt heads at the correct depth or discard the terminal block assembly and install a Beech P/N 103-27 terminal block assembly. 6. Inspect the insulator strips. If they are cracked or broken, either fabricate new strips from equivalent phenolic material or obtain new strips, Beech P/N 103-26. 7. Reinstall the terminal block assemblies, current limiters and all removed structure. Reconnect the battery. B) Any equivalent method of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region. Beechcraft Service Instructions Nos. 0754-350 for models E55, E55A, 58, 58A and B60 and No. 125-018, Rev. 1 for model BH125-600A or later FAA-approved revisions cover the subject matter of this AD. This amendment becomes effective July 6, 1976. FOOTER:
Document Text
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AD Final Rules - DRS_76-13-05.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 76-13-05 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; BEECH Models E55, E55A, 58 and 58A, B60, BH125-600A Airplanes Subject: Electrical Power Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 07/06/1976 Make: Textron Aviation Inc. Model: 58 | 58A | B60 | BH.125 Series 600A | E55 | E55A Product Type: Aircraft Product Subtype: Small/Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 76-13-05 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2653 AD NUMBER: 76-13-05 SUBJECT HEADING: Airworthiness Directives; BEECH Models E55, E55A, 58 and 58A, B60, BH125-600A Airplanes ACTION: SUMMARY: DATES: Effective July 6, 1976. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 76-13-05 BEECH: Amendment 39-2653. Applies to Models E55 and E55A (Serial Numbers TE-969 thru TE-1009, TE-1011 thru TE-1021, TE-1023 thru TE-1029 and TE-1032 thru TE-1034 airplanes; Models 58 and 58A (Serial Numbers TH-441 thru TH-482, TH-484 thru TH-541, TH-543 thru TH-547, TH-549 thru TH-555, TH-557 thru TH-595, TH-597 thru TH-602, TH-604, TH-605, TH-607 and TH-609) airplanes; Model B60 (Serial Numbers P-272 thru P-307, P-309 thru P-326, P-328 thru P-330), and Model BH125-600A (Serial Numbers 256001, 256002, 256004, 256007, 256009, 256010, 256011, 256013, 256014, 256016, 256018, 256020, 256022, 256023, 256032, and 256034) airplanes. Compliance: Required as indicated, unless already accomplished. To prevent complete loss of electrical power or damage to the engine firewall, either 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, accomplish the following: A) Inspect the terminal block assemblies and rework or replace where necessary in accordance with the following procedures: 1. Locate the terminal block assemblies mounted on: (a) The aft right side of the forward cabin bulkhead on Models E55, E55A, 58 and 58A. (b) The inboard side of the left nacelle firewall and the outboard side of the right nacelle firewall on Model B60. Both are on the forward side of the firewall. (c) The APU relay panel assembly and the right hand side of the horizontal cross member at frame 24 on Model BH125-600A. 2. Disconnect the battery and remove structure as necessary to gain access to the terminal block assemblies. 3. Remove the current limiters from the terminal block assemblies and then remove the terminal block assemblies. 4. Visually inspect the terminal block assemblies to determine if the bolt heads are properly recessed. A properly recessed bolt should be mounted from .010 inches to .070 inches below flush within the terminal block base. 5. If the bolt heads are not properly recessed, either remove the bolts and rework the holes to accept the bolt heads at the correct depth or discard the terminal block assembly and install a Beech P/N 103-27 terminal block assembly. 6. Inspect the insulator strips. If they are cracked or broken, either fabricate new strips from equivalent phenolic material or obtain new strips, Beech P/N 103-26. 7. Reinstall the terminal block assemblies, current limiters and all removed structure. Reconnect the battery. B) Any equivalent method of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region. Beechcraft Service Instructions Nos. 0754-350 for models E55, E55A, 58, 58A and B60 and No. 125-018, Rev. 1 for model BH125-600A or later FAA-approved revisions cover the subject matter of this AD. This amendment becomes effective July 6, 1976. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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