NAS18054
LOCK NUT
Specifications
- Part Number
- NAS18054
- Manufacturer
- —
- ATA ChapterMaintenance system chapter
- 67 — Rotors Flight ControlField reports: 67 (100%) — 1 report
- CapabilitySystem area (hydraulics, avionics, landing gear…)
- Consumables / Hardware
- Inventory ClassRotable, expendable, or consumable
- Consumable
- Certification
- OEM
- Aircraft Category
- Unknown
- Criticality
- Standard
Service Reliabilityfrom FAA SDR (Service Difficulty Reports)
- SDR reports
- 1
- Replace events
- 0
- Repair events
- 0
- K-code events
- 0
Directional indicator only. Reflects what operators reported to the FAA when a difficulty was logged — not a fleet-normalized failure rate or a cost-based BER. Use alongside operator-specific data.
Airworthiness Directive coverage
FAA / EASA public regulatory data
- FAAAD 2025-18-01effective Sep 25, 2025Prohibition
The FAA is adopting a new airworthiness directive (AD) for all Leonardo S.p.A. Model A109E, A109S, AW109SP, A119, and AW119 MKII helicopters. This AD was prompted by a report that certain manufacturer maintenance instructions for swashplate assembly installation specified incorrect torque values for certain swashplate nuts. This AD requires repetitively inspecting certain swashplate nuts for cracks, fretting, or slippage marks and, depending on the results, performing corrective actions. The FAA is issuing this AD to address the unsafe condition on these products.
- EASAAD 2025-0131effective Jun 30, 2025Prohibition
No summary available - see the EASA publication.
Directives citing this part number in the FAA / EASA regulatory corpus we have processed — not a complete historical AD list. An AD is a compliance requirement that drives scheduled work (inspections, replacements, modifications) on the fleets that carry the part; a directive naming this PN as the replacement part is install demand, not an action against it — and none of this is a prediction that the part will fail.
Airframe Applicability(1)
Data Sources(1)
- 2026-03-07
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