AD 78-01-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron Aviation Inc. | BH.125 Series 400A | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LIMITED Model DH/BH/HS-125 Airplanes |
| aircraft | Textron Aviation Inc. | BH.125 Series 600A | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LIMITED Model DH/BH/HS-125 Airplanes |
| aircraft | Textron Aviation Inc. | DH.125 Series 1A | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LIMITED Model DH/BH/HS-125 Airplanes |
| aircraft | Textron Aviation Inc. | DH.125 Series 1A-522 | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LIMITED Model DH/BH/HS-125 Airplanes |
| aircraft | Textron Aviation Inc. | DH.125 Series 1A/R-522 | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LIMITED Model DH/BH/HS-125 Airplanes |
| aircraft | Textron Aviation Inc. | DH.125 Series 1A/S-522 | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LIMITED Model DH/BH/HS-125 Airplanes |
| aircraft | Textron Aviation Inc. | DH.125 Series 3A | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LIMITED Model DH/BH/HS-125 Airplanes |
| aircraft | Textron Aviation Inc. | DH.125 Series 3A/R | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LIMITED Model DH/BH/HS-125 Airplanes |
| aircraft | Textron Aviation Inc. | DH.125 Series 3A/RA | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LIMITED Model DH/BH/HS-125 Airplanes |
| aircraft | Textron Aviation Inc. | DH.125 Series 400A | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LIMITED Model DH/BH/HS-125 Airplanes |
| aircraft | Textron Aviation Inc. | HS.125 Series 600A | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LIMITED Model DH/BH/HS-125 Airplanes |
| aircraft | Textron Aviation Inc. | HS.125 Series 700A | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LIMITED Model DH/BH/HS-125 Airplanes |
Unsafe Condition
Detachment of the bolts securing the elevator control pulley bracket to the aircraft structure
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the four bolts with 25-6CF 519 or NAS 1304-10H bolts and safety wire replacement bolts in pairs per Hawker Siddeley Aviation, Ltd. Modification Service Bulletin 27-122(2578) or FAA-approved equivalent.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 10 hours time in service after the effective date of this AD (for BH/HS-125-600A aircraft) and within 100 hours time in service after the effective date (for all other DH/BH-125 aircraft)
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
HAWKER SIDDELEY AVIATION, LIMITED Model DH/BH/HS-125 airplanes, certificated in all categories
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Elevator Control Pulley Bracket
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_78-01-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 78-01-06 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; HAWKER SIDDELEY AVIATION, LIMITED Model DH/BH/HS-125 Airplanes Subject: Elevator Control Pulley Bracket Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 01/12/1978 Make: Textron Aviation Inc. Model: BH.125 Series 400A | BH.125 Series 600A | DH.125 Series 1A | DH.125 Series 1A-522 | DH.125 Series 1A...Show more Product Type: Aircraft Product Subtype: 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: 78-01-06 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-3108 AD NUMBER: 78-01-06 SUBJECT HEADING: Airworthiness Directives; HAWKER SIDDELEY AVIATION, LIMITED Model DH/BH/HS-125 Airplanes ACTION: SUMMARY: DATES: Effective January 12, 1978. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 78-01-06 HAWKER SIDDELEY AVIATION, LIMITED: Amendment 39-3108. Applies to Model DH/BH/HS-125 airplanes, certificated in all categories. Compliance is required as indicated unless already accomplished. To prevent possible detachment of the bolts securing the elevator control pulley bracket to the aircraft structure, accomplish the following: (a) For BH/HS-125-600A aircraft, within 10 hours time in service after the effective date of this AD, replace the four bolts attaching the elevator control pulley bracket to the top of fin rear spar with 25-6CF 519 or NAS 1304-10H bolts and safety wire replacement bolts in pairs all in accordance with the section entitled "Accomplishment Instructions" of Hawker Siddeley Aviation, Ltd., Modification Service Bulletin 27-122(2578), dated March 31, 1977, or an FAA-approved equivalent. (b) For all other DH/BH-125 aircraft, within 100 hours time in service after the effective date of this AD, replace the four bolts attaching the elevator control pulley bracket to the top of the fin rear spar in accordance with Paragraph (a) of this AD. This amendment becomes effective January 12, 1978. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_78-01-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 78-01-06 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; HAWKER SIDDELEY AVIATION, LIMITED Model DH/BH/HS-125 Airplanes Subject: Elevator Control Pulley Bracket Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 01/12/1978 Make: Textron Aviation Inc. Model: BH.125 Series 400A | BH.125 Series 600A | DH.125 Series 1A | DH.125 Series 1A-522 | DH.125 Series 1A...Show more Product Type: Aircraft Product Subtype: 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: 78-01-06 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-3108 AD NUMBER: 78-01-06 SUBJECT HEADING: Airworthiness Directives; HAWKER SIDDELEY AVIATION, LIMITED Model DH/BH/HS-125 Airplanes ACTION: SUMMARY: DATES: Effective January 12, 1978. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 78-01-06 HAWKER SIDDELEY AVIATION, LIMITED: Amendment 39-3108. Applies to Model DH/BH/HS-125 airplanes, certificated in all categories. Compliance is required as indicated unless already accomplished. To prevent possible detachment of the bolts securing the elevator control pulley bracket to the aircraft structure, accomplish the following: (a) For BH/HS-125-600A aircraft, within 10 hours time in service after the effective date of this AD, replace the four bolts attaching the elevator control pulley bracket to the top of fin rear spar with 25-6CF 519 or NAS 1304-10H bolts and safety wire replacement bolts in pairs all in accordance with the section entitled "Accomplishment Instructions" of Hawker Siddeley Aviation, Ltd., Modification Service Bulletin 27-122(2578), dated March 31, 1977, or an FAA-approved equivalent. (b) For all other DH/BH-125 aircraft, within 100 hours time in service after the effective date of this AD, replace the four bolts attaching the elevator control pulley bracket to the top of the fin rear spar in accordance with Paragraph (a) of this AD. This amendment becomes effective January 12, 1978. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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