| 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)
| 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. Aero Commander Model 112 Parts Catalog Serial 1to 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 | System | Serial 1-25 Feature | Later