AD 87-04-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | B-N Group Ltd. | BN-2T | Airworthiness Directives; Pilatus Model BN-2T Islander Series Airplanes |
| aircraft | B-N Group Ltd. | BN-2T-4R | Airworthiness Directives; Pilatus Model BN-2T Islander Series Airplanes |
Unsafe Condition
Cracks in isolator mounting brackets (Barry Part No. 44-9115-0100) and defects in Barry-manufactured elastomer cores (Part Numbers R20700-2 or R20700-15) could lead to high engine vibrations and possible propeller whirl flutter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect isolator mounting brackets every 500 hours time-in-service (TIS) starting within 100 hours TIS after the effective date. Replace cracked thick-ribbed brackets with serviceable parts and replace cracked thin-ribbed brackets with thick-ribbed brackets as an engine mounting set. Inspect elastomer cores every 100 hours TIS starting within 100 hours TIS after the effective date; replace R20700-2 cores with R20700-15 and inspect/replace defective R20700-15 cores. Adjust inspection intervals up to 10% for maintenance coordination.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 100 hours time-in-service (TIS) after the effective date of this AD and at each subsequent interval specified.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pilatus Model BN-2T Islander (all serial numbers) airplanes certificated in any category.
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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