AD 84-14-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | LTS101-600A-2 | AVCO LYCOMING Model LTS101-600A-2 Engines |
Unsafe Condition
The T4 indicator system check may reveal errors exceeding ±5°C, indicating potential thermocouple loop resistance exceeding 5.7 ohms, loose or contaminated connections, or calibration deviations, which could lead to inaccurate T4 readings and compromise engine condition monitoring.
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Required Actions
Perform a T4 indicator system check within 50 engine operating hours and every 300 hours thereafter. Check thermocouple loop resistance, inspect harness connections, calibrate the indicator, and comply with service bulletin requirements for engine condition checks and vibration surveys as specified.
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Compliance Time
within the next 50 engine operating hours and thereafter at intervals not to exceed 300 engine operating hours
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Affected Aircraft
Avco Lycoming LTS101-600A-2 engines installed on AS350D helicopters with Brion Leroux T4 indicator part number 5626-524-00-00
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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