3989086
MODULATING VALVE
Specifications
- Part Number
- 3989086
- Manufacturer
- HNYWL
- ATA ChapterMaintenance system chapter
- 21 — Air Conditioning
- CapabilitySystem area (hydraulics, avionics, landing gear…)
- Pneumatics
- Inventory ClassRotable, expendable, or consumable
- Rotable
- Certification
- OEM
- Aircraft Category
- Multi-Category
- Criticality
- Standard
Service Reliabilityfrom FAA SDR (Service Difficulty Reports)
100%
Scrap Propensity (SDR-derived)
- SDR reports
- 7
- Replace events
- 7
- Repair events
- 0
- K-code events
- 4
Reporting window 2022-05-19 – 2025-01-17Dominant chapter ATA 21
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.
Airframe Applicability(9)
Data Sources(1)
- 2026-03-07
Quick Facts
Airframes9 applicable
AlternatesNone recorded
ClassRotable
CriticalityStandard
CategoryMulti-Category
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