AD 77-13-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron Aviation Inc. | BH.125 Series 400A | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD Model DH/BH-125 Airplanes Series |
| aircraft | Textron Aviation Inc. | BH.125 Series 600A | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD Model DH/BH-125 Airplanes Series |
| aircraft | Textron Aviation Inc. | DH.125 Series 1A | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD Model DH/BH-125 Airplanes Series |
| aircraft | Textron Aviation Inc. | DH.125 Series 1A-522 | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD Model DH/BH-125 Airplanes Series |
| aircraft | Textron Aviation Inc. | DH.125 Series 1A/R-522 | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD Model DH/BH-125 Airplanes Series |
| aircraft | Textron Aviation Inc. | DH.125 Series 1A/S-522 | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD Model DH/BH-125 Airplanes Series |
| aircraft | Textron Aviation Inc. | DH.125 Series 3A | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD Model DH/BH-125 Airplanes Series |
| aircraft | Textron Aviation Inc. | DH.125 Series 3A/R | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD Model DH/BH-125 Airplanes Series |
| aircraft | Textron Aviation Inc. | DH.125 Series 3A/RA | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD Model DH/BH-125 Airplanes Series |
| aircraft | Textron Aviation Inc. | DH.125 Series 400A | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD Model DH/BH-125 Airplanes Series |
Unsafe Condition
Excessive boss thickness on aileron inner hinge brackets may result in insufficient engagement and prevent self locking of the cable guard in the thread insert.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 100 hours time in service after the effective date, measure boss thickness of the aileron inner hinge brackets. If thickness exceeds .35 inches (top flange) or .31 inches (bottom flange), inspect cable guards before further flight and replace improperly secured, loose, or missing guards with new ones. Secure guards must be replaced within 300 hours time in service. Prior to installing spare brackets or guards, measure boss thickness and replace non-compliant guards.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 100 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
Hawker Siddeley Aviation, Ltd Model DH/BH-125 airplanes, all series, with manufacturer's serial numbers 256056 and below and serial number 256061
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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