AD 84-20-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | BRITISH | 125 | Airworthiness Directives; BRITISH AEROSPACE Model DH/HS/BH 125 Airplanes Series |
Unsafe Condition
Landing gear and brake failure due to potential failure of the landing gear emergency selector shaft assembly, brake control valve knife edges overhauled by Dunlop Aviation Incorporated, and main landing gear jacks with cracks.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Incorporate modification No. 251714 to the landing gear emergency selector shaft assembly per Service Bulletin 32-59-(1714), replace brake control valve knife edges with new parts per Service Bulletin 32-193, inspect and replace main landing gear jacks for cracks per Service Bulletin 32-A197.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 90 days after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
BRITISH AEROSPACE Model DH/HS/BH 125 airplanes series: BH.125 Series 400A, BH.125 Series 600A, DH.125 Series 1A, DH.125 Series 1A/R-522, and others listed in the service bulletins' Planning Information section.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Landing Gear and Brakes
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_84-20-05.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 84-20-05 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; BRITISH AEROSPACE Model DH/HS/BH 125 Airplanes Series Subject: Landing Gear and Brakes Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 10/14/1984 Make: Model: BH.125 Series 400A | BH.125 Series 600A | DH.125 Series 1A | DH.125 Series 1A/R-522 | DH.125 Series ...Show more Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 84-20-05 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-4910 AD NUMBER: 84-20-05 SUBJECT HEADING: Airworthiness Directives; BRITISH AEROSPACE Model DH/HS/BH 125 Airplanes Series ACTION: SUMMARY: DATES: Effective October 14, 1984. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 84-20-05 BRITISH AEROSPACE: Amendment 39-4910. Applies to Model DH/HS/BH 125 airplanes, series and serial numbers listed in the Planning Information section of the service bulletins referenced below, certificated in all categories. Compliance is required as indicated, unless previously accomplished. To prevent landing gear and brake failure, within the next 90 days after the effective date of this AD, accomplish the following: A. Incorporate British Aerospace modification No. 251714 to the landing gear emergency selector shaft assembly in accordance with the instructions of British Aerospace HS 125 Service Bulletin 32-59-(1714), Revision 3, dated June 23, 1983. B. Replace the knife edges of the brake control valves that have been overhauled by Dunlop Aviation Incorporated (California), with new parts in accordance with the instructions of British Aerospace HS 125 Service Bulletin 32-193, Revision 1, dated July 26, 1983. C. Inspect the main landing gear jacks for cracks, and replace the jacks if necessary, in accordance with the instructions of British Aerospace HS 125 Service Bulletin 32-A197, dated August 29, 1983. D. Alternate means of compliance which provide an equivalent level of safety may be used when approved by the Manager, Seattle Aircraft Certification Office, FAA, Northwest Mountain Region. E. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base for the accomplishment of inspections and/or modifications required by this AD. This amendment becomes effective October 14, 1984. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_84-20-05.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 84-20-05 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; BRITISH AEROSPACE Model DH/HS/BH 125 Airplanes Series Subject: Landing Gear and Brakes Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 10/14/1984 Make: Model: BH.125 Series 400A | BH.125 Series 600A | DH.125 Series 1A | DH.125 Series 1A/R-522 | DH.125 Series ...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: 84-20-05 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-4910 AD NUMBER: 84-20-05 SUBJECT HEADING: Airworthiness Directives; BRITISH AEROSPACE Model DH/HS/BH 125 Airplanes Series ACTION: SUMMARY: DATES: Effective October 14, 1984. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 84-20-05 BRITISH AEROSPACE: Amendment 39-4910. Applies to Model DH/HS/BH 125 airplanes, series and serial numbers listed in the Planning Information section of the service bulletins referenced below, certificated in all categories. Compliance is required as indicated, unless previously accomplished. To prevent landing gear and brake failure, within the next 90 days after the effective date of this AD, accomplish the following: A. Incorporate British Aerospace modification No. 251714 to the landing gear emergency selector shaft assembly in accordance with the instructions of British Aerospace HS 125 Service Bulletin 32-59-(1714), Revision 3, dated June 23, 1983. B. Replace the knife edges of the brake control valves that have been overhauled by Dunlop Aviation Incorporated (California), with new parts in accordance with the instructions of British Aerospace HS 125 Service Bulletin 32-193, Revision 1, dated July 26, 1983. C. Inspect the main landing gear jacks for cracks, and replace the jacks if necessary, in accordance with the instructions of British Aerospace HS 125 Service Bulletin 32-A197, dated August 29, 1983. D. Alternate means of compliance which provide an equivalent level of safety may be used when approved by the Manager, Seattle Aircraft Certification Office, FAA, Northwest Mountain Region. E. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base for the accomplishment of inspections and/or modifications required by this AD. This amendment becomes effective October 14, 1984. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.
Related Airworthiness Directives
2006-16-18 R1
final ruleAirworthiness Directives; Sandel Avionics Incorporated Model ST3400 Terrain Awareness Warning System/Radio Magnetic Indicator (TAWS/ RMI) Units Approved Under Technical Standard Order(s) C113, C151a, or C151b; Installed on Various Small and Transport Category Airplanes
Unsafe Condition: A bearing error in the Sandel Avionics Incorporated Model ST3400 TAWS/RMI unit configured to receive bearing information from a VOR receiver interface via a composite video signal, due to a combina...
2002-15-02
final ruleAirworthiness Directives; Hamilton Sundstrand Power Systems (Formerly Sundstrand Power Systems, Turbomach, and Solar) T-62T Series Auxiliary Power Units
Unsafe Condition: Stress levels in compressor wheels part number 100636-1 are high enough to initiate and drive crack growth, potentially leading to uncontained compressor wheel failure and damage to the airplane.
91-07-12
final ruleAirworthiness Directives; BRITISH AEROSPACE Model DH/BH/HS 125 Series Airplanes
Unsafe Condition: Failure of the main landing gear (MLG) door aluminum forward hinge fittings could result in improper operation of the MLG door.
88-05-02
final ruleAirworthiness Directives; BRITISH AEROSPACE (BAe) PLC Model DH/BH/HS 125 Series Airplanes
Unsafe Condition: Fatigue cracking in the airplane structure at the flap outboard hinge fitting and fuselage skin beneath the canopy blister, which could result in the inability of the structure to meet required loads.
