654650A4
CYLINDER HEAD
Specifications
- Part Number
- 654650A4
- Manufacturer
- —
- ATA ChapterMaintenance system chapter
- 85 — Reciprocating Engine
- CapabilitySystem area (hydraulics, avionics, landing gear…)
- unknown
- Inventory ClassRotable, expendable, or consumable
- Expendable
- Certification
- —
- Aircraft Category
- Wide-Body
- Criticality
- Standard
Service Reliabilityfrom FAA SDR (Service Difficulty Reports)
100%
Scrap Propensity (SDR-derived)
- SDR reports
- 3
- Replace events
- 3
- Repair events
- 0
- K-code events
- 3
Reporting window 1998-07-01 – 1999-11-09Dominant chapter ATA 85
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(6)
Data Sources(1)
- 2026-03-07
Quick Facts
Airframes6 applicable
AlternatesNone recorded
ClassExpendable
CriticalityStandard
CategoryWide-Body
Know your business mix?
Upload your part numbers and get instant analytics — airframe breakdown, ATA depth, PMA concentration, and more.
Coming SoonSimilar Parts(8)
-05 & -06
Rotomaster Controller
ATA 85OEM
-5 or -6 is installed.
Piston Ring
ATA 85OEM
-5 or -6 is installed.
Piston Ring
ATA 85OEM
-A20P
Barrel
ATA 85OEM
-A20P replacing Textron Lycoming Cylinder Assemblies 16B21508
Barrel, Narrow-Deck
ATA 85OEM
-A21P and SL32000NA-SF
Barrel, Narrow-Deck
ATA 85OEM
-A21P replacing Textron Lycoming Cylinder Assemblies LW-12417
Barrel
ATA 85OEM
-A21P replacing Textron Lycoming Cylinder Assemblies LW-12422 LW-12423
Barrel, Narrow-Deck
ATA 85OEM