AD 99-20-12

final rule
Data completeness: 70%

Airworthiness Directives; MD Helicopters Inc. Model 369D, 369E, 369FF, 500N, and 600N Helicopters

AD Number
99-20-12
Status
final_rule
Effective Date
Product Category
aircraft
Docket
98-SW-80-AD
FR Citation
Federal Register: September 30, 1999 (Volume 64, Number 189)

Applicability

TypeManufacturerModelDetails
aircraft MD Helicopters, Inc. 369D Airworthiness Directives; MD Helicopters Inc. Model 369D, 369E, 369FF, 500N, and 600N Helicopters
aircraft MD Helicopters, Inc. 369E Airworthiness Directives; MD Helicopters Inc. Model 369D, 369E, 369FF, 500N, and 600N Helicopters
aircraft MD Helicopters, Inc. 369FF Airworthiness Directives; MD Helicopters Inc. Model 369D, 369E, 369FF, 500N, and 600N Helicopters
aircraft MD Helicopters, Inc. 500N Airworthiness Directives; MD Helicopters Inc. Model 369D, 369E, 369FF, 500N, and 600N Helicopters
aircraft MD Helicopters, Inc. 600N Airworthiness Directives; MD Helicopters Inc. Model 369D, 369E, 369FF, 500N, and 600N Helicopters

Unsafe Condition

Failure of the oil cooler blower bracket (P/N 369F5190-1) could result in loss of cooling of engine oil and transmission oil, leading to a subsequent forced landing.

AI-generated summary from the source AD text. Verify against the official source before acting.

Required Actions

Replace the oil cooler blower bracket P/N 369F5190-1 with an airworthy bracket P/N 369F5194-1 within 100 hours time-in-service. Alternative methods of compliance may be approved by the Manager, Los Angeles Aircraft Certification Office.

AI-generated summary from the source AD text. Verify against the official source before acting.

Compliance Time

Within 100 hours time-in-service

AI-generated summary from the source AD text. Verify against the official source before acting.

Affected Aircraft

MD Helicopters Inc. Models 369D, 369E, 369FF, 500N, and 600N helicopters with oil cooler blower bracket P/N 369F5190-1 installed.

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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