AD 87-15-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | ALF502L | TEXTRON LYCOMING Model ALF502R and ALF502L Series Engines |
| engine | Honeywell International Inc. | ALF502L-2 | TEXTRON LYCOMING Model ALF502R and ALF502L Series Engines |
| engine | Honeywell International Inc. | ALF502L-2A | TEXTRON LYCOMING Model ALF502R and ALF502L Series Engines |
| engine | Honeywell International Inc. | ALF502L-2C | TEXTRON LYCOMING Model ALF502R and ALF502L Series Engines |
| engine | Honeywell International Inc. | ALF502L-3 | TEXTRON LYCOMING Model ALF502R and ALF502L Series Engines |
| engine | Honeywell International Inc. | ALF502R-3 | TEXTRON LYCOMING Model ALF502R and ALF502L Series Engines |
| engine | Honeywell International Inc. | ALF502R-3A | TEXTRON LYCOMING Model ALF502R and ALF502L Series Engines |
| engine | Honeywell International Inc. | ALF502R-4 | TEXTRON LYCOMING Model ALF502R and ALF502L Series Engines |
| engine | Honeywell International Inc. | ALF502R-5 | TEXTRON LYCOMING Model ALF502R and ALF502L Series Engines |
| engine | Honeywell International Inc. | ALF502R-6 | TEXTRON LYCOMING Model ALF502R and ALF502L Series Engines |
Unsafe Condition
Failure of the gas producer turbine (GPT) spacer can result in loss of engine power.
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Required Actions
Remove from service GPT spacers with specific part numbers based on their cycles since new (CSN) levels, following Avco Lycoming Textron Service Bulletins ALF502R-72-0163 or ALF502L-72-0163. Inspect removed spacers; if cracked through radially from the inside diameter to the rim, remove the first and second stage turbine disks, sealing plate, and cracked spacer prior to further flight.
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Compliance Time
Prior to accumulating specified cycles since new (CSN) as follows: 1,000 cycles after AD effective date for spacers with ≥6,000 CSN; 7,000 CSN for 5,000-5,999 CSN; 6,000 CSN for 4,000-4,999 CSN; 5,000 CSN for 3,000-3,999 CSN; 4,400 CSN for 2,100-2,999 CSN; and 3,500 CSN for <2,100 CSN on the effective date.
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Affected Aircraft
Avco Lycoming Textron ALF502R and ALF502L series turbofan engines with GPT spacers part numbers 2-121-071-28, 2-121-071-30, 2-121-071-20, or 2-121-071-24.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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