3989085
MODULATING VALVE
Specifications
- Part Number
- 3989085
- Manufacturer
- Honeywell
- ATA ChapterMaintenance system chapter
- 21 — Air ConditioningField reports: 21 (>99%) · 33 (<1%) — 350 reports
- CapabilitySystem area (hydraulics, avionics, landing gear…)
- Pneumatics
- Inventory ClassRotable, expendable, or consumable
- Rotable
- Certification
- OEM
- Aircraft Category
- Unknown
- Criticality
- Standard
- Life & ShelfTypical service/shelf life — verify against OEM data
- —
Service Reliabilityfrom FAA SDR (Service Difficulty Reports)
100%
Scrap Propensity (SDR-derived)
- SDR reports
- 350
- Replace events
- 323
- Repair events
- 0
- K-code events
- 78
Reporting window 2015-09-26 – 2025-12-10Dominant 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(3)
Data Sources(1)
- 2026-03-07
Quick Facts
Airframes3 applicable
AlternatesNone recorded
ClassRotable
CriticalityStandard
CategoryNarrow-body
Know your business mix?
Upload your part numbers and get instant analytics — airframe breakdown, ATA depth, PMA concentration, and more.
Analyze my parts →Similar Parts(8)
10306814
OUTFLOW VALVE
ATA 21OEMHoneywell
1032788
OUTFLOW VALVE
ATA 21OEMHoneywell
10356812
SAFETY VALVE
ATA 21OEMHoneywell
1036361
OUTFLOW VALVE
ATA 21OEMHoneywell
1036783
CABIN PRESSURE
ATA 21OEMHoneywell
1037802
OUTFLOW VALVE
ATA 21OEMHoneywell
1039221
OUTFLOW VALVE
ATA 21OEMHoneywell
104568
VALVE
ATA 21unknownHoneywell