| System | Serial 1-25 Feature | Later 112/112A Change | Part Number Change | |--------|----------------------|------------------------|--------------------| | Fuel Tanks | Wet wing (sealed integral) – Serials 1-15 | Bladder tanks – Serial 16+ | 112-5000 series → 112-5100 series | | Cowling | 2-piece upper cowl | 1-piece | 112-6001 → 112-6005 | | Main Spar | Undrilled for later flap mods | Drilled for increased flap travel | No P/N change – refer to SB 112-12 | | Seat Rails | Non-locking inertia reel type | Latching rails | 112-4001 → 112-4004 | | Trim Wheel | Plastic spokes (cracking prone) | Metal | 112-9001-1 → -3 | Figure 29: Master Relay & Starter Contactor (12V System – Serials 1-25)
Since Serials 1–25 represent the very first production batch (often incorporating pre-production variations, hand-fitted parts, and differences from later 112A/112B models), the catalog emphasizes , legacy part numbers , and service bulletins unique to these early airframes. AERO COMMANDER MODEL 112 PARTS CATALOG For Serial Numbers 1 through 25 Inclusive Aero Commander Model 112 Parts Catalog Serial 1to 25
| Item | Part Number | Nomenclature | Qty Per Ship | Effectivity (Serial) | Reference | |------|-------------|-----------------------------|--------------|----------------------|-----------| | 1 | 112-3100-1 | Main gear weld assembly (LH) | 1 | 1-25 | Fig 11-1 | | 2 | 112-3100-2 | Main gear weld assembly (RH) | 1 | 1-25 | Fig 11-2 | | 3 | 112-3110-1 | Nose fork assembly (no shimmy damper) | 1 | 1-10 | (Obsolete – use SB 112-7) | | 4 | 112-3110-3 | Nose fork w/ shimmy damper | 1 | 11-25 | | | 5 | AN6-25A | Bolt – main gear pivot | 2 | 1-25 | Mil Spec | | 6 | 112-3152 | Brake caliper bracket – early | 2 | 1-25 | Cleve. wheel only | All bolts are AN or NAS standard unless shown. For Serials 1-25, use original IPC for washer and cotter pin callouts – later catalogs supersede incorrectly. 5. Special Section: Differences Between Serials 1-25 and Later Models This section is critical for mechanics and owners. | System | Serial 1-25 Feature | Later
