AD 2021-19-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Leonardo S.p.a. Helicopters |
Unsafe Condition
spurious in-flight disconnections of the automatic flight control system (AFCS), spurious degradation or unavailability of the full AFCS
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
update certain 'Primus Epic' system software, as specified in EASA AD 2018-0002
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Compliance Time
Within 50 flight hours
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Affected Aircraft
Leonardo S.p.a. Model AB139 and AW139 helicopters, certificated in any category, identified in paragraphs (c)(1) and (2) of this AD, equipped with 'Primus Epic' system software release 7.4 (Phase 7 V1), 7.7 (Phase 7 V3) or 7.10 (Phase 7 V4), Model AB139 and AW19 helicopters having serial number (S/N) 31005, 31006, and S/Ns 31008 through 31157 inclusive; and S/Ns 41001 through 41023 inclusive, Model AW139 helicopters having S/N 31201 and subsequent, and S/N 41201 and subsequent
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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