AD 78-01-17
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Kawasaki Heavy Industries, Limited | KV107-II | Airworthiness Directives; KAWASAKI HEAVY INDUSTRIES, LTD Models KV-107-II and KV-107-IIA Helicopter |
| aircraft | Kawasaki Heavy Industries, Limited | KV107-IIA | Airworthiness Directives; KAWASAKI HEAVY INDUSTRIES, LTD Models KV-107-II and KV-107-IIA Helicopter |
Unsafe Condition
Fatigue cracks on the forward and aft rotor drive shafts, fatigue failure of the aft rotor transmission quill shaft, cracking in the synchronizing shaft splined adapter, cracking in the rotor pitch housing and blade root sockets, electrical wiring system malfunctions causing engine false fire warnings, failure of the aft transmission collector gear and planetary carrier retention nut, failure of the rotor blade due to undetected spar cracks, corrosion-induced cracking of main rotor blade spars, and fatigue cracks on the forward transmission rotor shaft and carrier and aft transmission planetary carrier.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace specific rotor shafts and extensions, inspect and modify aft transmission assemblies, inspect and replace synchronizing shaft splined adapters, inspect rotor pitch housing and blade root sockets, modify electrical wiring and test switches, inspect and modify aft transmission components, install Integral Spar Inspection System (ISIS) on rotor blades, inspect for corrosion on rotor blades, replace or modify transmission components, and ensure compliance with specified service bulletins or FAA-approved equivalents within the next 25 hours time in service after the effective date, with recurring inspections at specified intervals.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 25 hours time in service after the effective date of this AD, unless already accomplished, and thereafter at intervals not to exceed specified hours or months as per service bulletins.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Kawasaki Heavy Industries, Limited models KV107-II and KV107-IIA helicopters certificated in all categories.
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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