AD 91-08-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | MD Helicopters, Inc. | 369 | Airworthiness Directives; MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) (HUGHES) All Model 369 Series Helicopters |
| aircraft | MD Helicopters, Inc. | 369A | Airworthiness Directives; MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) (HUGHES) All Model 369 Series Helicopters |
| aircraft | MD Helicopters, Inc. | 369D | Airworthiness Directives; MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) (HUGHES) All Model 369 Series Helicopters |
| aircraft | MD Helicopters, Inc. | 369E | Airworthiness Directives; MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) (HUGHES) All Model 369 Series Helicopters |
| aircraft | MD Helicopters, Inc. | 369F | Airworthiness Directives; MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) (HUGHES) All Model 369 Series Helicopters |
| aircraft | MD Helicopters, Inc. | 369FF | Airworthiness Directives; MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) (HUGHES) All Model 369 Series Helicopters |
| aircraft | MD Helicopters, Inc. | 369H | Airworthiness Directives; MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) (HUGHES) All Model 369 Series Helicopters |
| aircraft | MD Helicopters, Inc. | 369HE | Airworthiness Directives; MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) (HUGHES) All Model 369 Series Helicopters |
| aircraft | MD Helicopters, Inc. | 369HM | Airworthiness Directives; MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) (HUGHES) All Model 369 Series Helicopters |
| aircraft | MD Helicopters, Inc. | 369HS | Airworthiness Directives; MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) (HUGHES) All Model 369 Series Helicopters |
Unsafe Condition
Cracks in the tail rotor blade root fitting could result in tail rotor blade failure and subsequent loss of the tail rotor blade.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 8 hours time in service after the effective date, determine if affected aluminum tail rotor blades with specific part numbers and serial numbers below thresholds are installed without a yellow dot. Record the part and serial numbers. Conduct daily visual checks for cracks in the root fitting area shown in Figure 1. Within 100 hours time in service, perform dimensional inspections using specified tools and procedures, replace unairworthy blades, apply a yellow dot to airworthy blades, and record compliance. Ensure proper installation and balancing of blades.
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Compliance Time
Within 8 hours time in service after the effective date of this AD, or upon installing replacement tail rotor blades. Thereafter, prior to the first flight of each day. Dimensional inspections must be accomplished within 100 hours time in service after the effective date.
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Affected Aircraft
MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) (HUGHES) Model 369 series helicopters, certificated in any category, with tail rotor blades having specific part numbers (369A1613, 369D21613, 369D21615, 369D21606, 421-088) and serial numbers below specified thresholds, and without a yellow dot on the root fitting.
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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