AD 72-06-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H.114 Heron Series 2A | Airworthiness Directives; Hawker Siddeley Model DH-114 Series 2 "Heron" Airplanes |
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H.114 Heron Series 2DA | Airworthiness Directives; Hawker Siddeley Model DH-114 Series 2 "Heron" Airplanes |
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H.114 Heron Series 2X | Airworthiness Directives; Hawker Siddeley Model DH-114 Series 2 "Heron" Airplanes |
Unsafe Condition
Failure of the main undercarriage down lock operating lever assembly due to cracks or corrosion that cannot be removed by cleaning.
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Required Actions
Inspect the lever assembly using dye penetrant method after removing protective coating and paint. Replace parts with serviceable ones of same part number or install new P/N 14-2U.181A/2 if cracks or unremovable corrosion are found. Protect replacement parts with lanolin or equivalent before installation.
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Compliance Time
Within the next 150 hours' time in service after the effective date (April 6, 1972) unless accomplished within the last 150 hours. For post-Modification 608 assemblies, within the next 150 hours' time in service after effective date or within 300 hours from last inspection, whichever is later, and thereafter every 300 hours' time in service.
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Affected Aircraft
Hawker Siddeley Model DH-114 Series 2 Heron airplanes without Heron Modification 1592, Part A, including D.H.114 Heron Series 2A, 2DA, 2X models with main undercarriage down lock operating lever assemblies P/N 14-2U.181A (pre Modification 608) or P/N 14-2U.181A/1 (post Modification 608).
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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