AD 78-20-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | MD Helicopters, Inc. | 369D | Airworthiness Directives; Hughes Model 369D and 369H Helicopters |
| aircraft | MD Helicopters, Inc. | 369H | Airworthiness Directives; Hughes Model 369D and 369H Helicopters |
Unsafe Condition
Hydraulic fluid entering the engine after a seal failure of the Chadwick hydraulic motor and possible fatigue cracking of the helicopter undercarriage.
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Required Actions
Install a drain line on the engine mounting flange (Chadwick P/N 500-60405-1) per Chadwick Service Bulletin 500-78-02 or approved method. Install a doubler (P/N 500-60487-1) and grommet (P/N AN931-7-11) per Chadwick Service Bulletin 500-79-01 or approved method.
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Compliance Time
Within the next 100 hours time in service or 30 days, whichever comes first, and within the next 50 hours flying time or six months, whichever comes first, after the effective date of this amended AD.
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Affected Aircraft
Hughes Model 369D and 369H helicopters with C-500 aerial spray system (STC No. SH184NW) or Chadwick C-500 fire suppression kit (STC No. SH567NW) installed.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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