AD 76-17-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron Aviation Inc. | BH.125 Series 400A | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD Model DH/BH-125, 400A, DH/BH-125 1A, 1A-522, 1A/S-522, 3A, 3AR, 3ARA Series Airplanes |
| aircraft | Textron Aviation Inc. | DH.125 Series 1A | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD Model DH/BH-125, 400A, DH/BH-125 1A, 1A-522, 1A/S-522, 3A, 3AR, 3ARA Series Airplanes |
| aircraft | Textron Aviation Inc. | DH.125 Series 1A-522 | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD Model DH/BH-125, 400A, DH/BH-125 1A, 1A-522, 1A/S-522, 3A, 3AR, 3ARA Series Airplanes |
| aircraft | Textron Aviation Inc. | DH.125 Series 1A/S-522 | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD Model DH/BH-125, 400A, DH/BH-125 1A, 1A-522, 1A/S-522, 3A, 3AR, 3ARA Series Airplanes |
| aircraft | Textron Aviation Inc. | DH.125 Series 3A | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD Model DH/BH-125, 400A, DH/BH-125 1A, 1A-522, 1A/S-522, 3A, 3AR, 3ARA Series Airplanes |
| aircraft | Textron Aviation Inc. | DH.125 Series 3A/R | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD Model DH/BH-125, 400A, DH/BH-125 1A, 1A-522, 1A/S-522, 3A, 3AR, 3ARA Series Airplanes |
| aircraft | Textron Aviation Inc. | DH.125 Series 3A/RA | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD Model DH/BH-125, 400A, DH/BH-125 1A, 1A-522, 1A/S-522, 3A, 3AR, 3ARA Series Airplanes |
| aircraft | Textron Aviation Inc. | DH.125 Series 400A | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD Model DH/BH-125, 400A, DH/BH-125 1A, 1A-522, 1A/S-522, 3A, 3AR, 3ARA Series Airplanes |
Unsafe Condition
Possible unwanted deployment of airbrakes in flight due to inadequate design of airbrake servodynes and operating circuit.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Modify airbrake servodynes (P/N AIR 45398/45399) per Part A of Service Bulletin 27-86-(2174) unless already altered with P/N AIR 46520/0 or 46521/0. Modify airbrake operating circuit (R/H and L/H) per Part C of the same Service Bulletin. Compliance must be done within the next 200 hours time in service after the effective date.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 200 hours time in service after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Model DH/BH-125 Series 400A (S/N NA-711 through NA-758) and all Model DH/BH-125 Series 1A, 1A-522, 1A/S-522, 3A, 3AR, 3ARA certificated in all categories.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Airbrake Operating Circuit
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_76-17-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 76-17-06 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD Model DH/BH-125, 400A, DH/BH-125 1A, 1A-522,...Show more Subject: Airbrake Operating Circuit Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 09/27/1976 Make: Textron Aviation Inc. Model: BH.125 Series 400A | DH.125 Series 1A | DH.125 Series 1A-522 | DH.125 Series 1A/S-522 | DH.125 Serie...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: 76-17-06 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2705 AD NUMBER: 76-17-06 SUBJECT HEADING: Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD Model DH/BH-125, 400A, DH/BH-125 1A, 1A-522, 1A/S-522, 3A, 3AR, 3ARA Series Airplanes ACTION: SUMMARY: DATES: Effective September 27, 1976. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 76-17-06 HAWKER SIDDELEY AVIATION, LTD: Amendment 39-2705. Applies to Model DH/BH-125 airplanes Series 400A, S/N NA-711 through NA-758 and all Model DH/BH-125 airplanes Series 1A, 1A-522, 1A/S-522, 3A, 3AR, 3ARA, certificated in all categories. Compliance is required within the next 200 hours time in service after the effective date of this AD, unless already accomplished. To prevent possible unwanted deployment of airbrakes inflight, accomplish the following: a) For all aircraft except those altered to include airbrake servodynes P/N AIR 46520/0 and 46521/0 in accordance with the Part D Supplement of Hawker Siddeley Aviation Ltd., Modification 252174, Service Bulletin SB 27-86-(2174), dated March 29, 1972, modify the airbrake servodynes, P/N AIR 45398 and 45399, in accordance with Part A of the section entitled "Accomplishment Instructions" of Hawker Siddeley Aviation Ltd., Service Bulletin 27-86-(2174), Revision 4, dated March 29, 1972, or an FAA-approved equivalent. b) For all aircraft, modify the airbrake operating circuit (R/H and L/H) in accordance with Part C of the section entitled "Accomplishment Instructions" of Hawker Siddeley Aviation, Ltd., Service Bulletin 27-86-(2174), Revision 4, dated March 29, 1972, or an FAA-approved equivalent. This amendment becomes effective September 27, 1976. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_76-17-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 76-17-06 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD Model DH/BH-125, 400A, DH/BH-125 1A, 1A-522,...Show more Subject: Airbrake Operating Circuit Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 09/27/1976 Make: Textron Aviation Inc. Model: BH.125 Series 400A | DH.125 Series 1A | DH.125 Series 1A-522 | DH.125 Series 1A/S-522 | DH.125 Serie...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: 76-17-06 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2705 AD NUMBER: 76-17-06 SUBJECT HEADING: Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD Model DH/BH-125, 400A, DH/BH-125 1A, 1A-522, 1A/S-522, 3A, 3AR, 3ARA Series Airplanes ACTION: SUMMARY: DATES: Effective September 27, 1976. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 76-17-06 HAWKER SIDDELEY AVIATION, LTD: Amendment 39-2705. Applies to Model DH/BH-125 airplanes Series 400A, S/N NA-711 through NA-758 and all Model DH/BH-125 airplanes Series 1A, 1A-522, 1A/S-522, 3A, 3AR, 3ARA, certificated in all categories. Compliance is required within the next 200 hours time in service after the effective date of this AD, unless already accomplished. To prevent possible unwanted deployment of airbrakes inflight, accomplish the following: a) For all aircraft except those altered to include airbrake servodynes P/N AIR 46520/0 and 46521/0 in accordance with the Part D Supplement of Hawker Siddeley Aviation Ltd., Modification 252174, Service Bulletin SB 27-86-(2174), dated March 29, 1972, modify the airbrake servodynes, P/N AIR 45398 and 45399, in accordance with Part A of the section entitled "Accomplishment Instructions" of Hawker Siddeley Aviation Ltd., Service Bulletin 27-86-(2174), Revision 4, dated March 29, 1972, or an FAA-approved equivalent. b) For all aircraft, modify the airbrake operating circuit (R/H and L/H) in accordance with Part C of the section entitled "Accomplishment Instructions" of Hawker Siddeley Aviation, Ltd., Service Bulletin 27-86-(2174), Revision 4, dated March 29, 1972, or an FAA-approved equivalent. This amendment becomes effective September 27, 1976. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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