PU90421S
SMOKE DETECTOR
Specifications
- Part Number
- PU90421S
- Manufacturer
- —
- ATA ChapterMaintenance system chapter
- 26 — Fire ProtectionField reports: 26 (100%) — 5 reports
- CapabilitySystem area (hydraulics, avionics, landing gear…)
- Safety / Emergency
- Inventory ClassRotable, expendable, or consumable
- Rotable
- Certification
- OEM
- Aircraft Category
- Unknown
- Criticality
- Standard
- Life & ShelfTypical service/shelf life — verify against OEM data
- Smoke Detectoron-conditionTypical: On-condition; some 10-yr calendar— planning value, not this unit's certified limit
Service Reliabilityfrom FAA SDR (Service Difficulty Reports)
100%
Scrap Propensity (SDR-derived)
- SDR reports
- 5
- Replace events
- 5
- Repair events
- 0
- K-code events
- 5
Reporting window 1996-02-02 – 1997-08-15Dominant chapter ATA 26
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
CategoryNarrow & wide-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)
-48 & -49
Switch, Engine/APU Fire Shutoff
ATA 26OEM
-51 & -52
Switch, Engine/APU Fire Shutoff
ATA 26OEM
(233N6203-1045)
Panel Assy - APU and Cargo Fire Control, M10444
ATA 26OEM
(233N6203-106)
Panel Assy
ATA 26OEM
(233N6203-1202)
Panel Assy - APU and Cargo Fire Control, M10444
ATA 26OEM
(233N6203-1304)
Panel Assy - APU and Cargo Fire Control, M10445
ATA 26OEM
(233N6203-1343)
Panel Assy - APU and Cargo Fire Control, M10445
ATA 26OEM
(233N6203-1343)
Panel Assy - APU and Cargo Fire Control, M10445
ATA 26OEM