2004 TUG / Stewart & Stevenson TMD-250. 250 PPM Air Start Unit

2004 TUG / Stewart & Stevenson TMD-250 Air Start Unit – 250 PPM, Dual Hose Setup

A high-performance aircraft air start solution tailored for most wide-body operations. This TUG / Stewart & Stevenson TMD-250 delivers an impressive 250 lb/min (PPM) of continuous airflow, powered by a robust Detroit Diesel Series 60, 14.0 L, 630 HP, turbocharged engine complete with DDEC-IV ECM control.

Key Features & Benefits

• Dual discharge air outlets with manual shutoff valves for streamlined aircraft servicing. 
• On-Demand engine throttle control system adjusts pressure automatically between jet-start and air-pack modes—offering improved fuel efficiency, reduced noise, and less maintenance. 
• Built-in safety shutdowns for engine and compressor (over-temp, low oil pressure, etc.) ensure safe, reliable operation. 
• Maintenance-friendly design features: gull-wing access panels, remote lube oil drains, maintenance-free 24 V batteries, oil sump plug, and sound-dampening insulation. 

Specs (Trailer-Mounted Configuration)

• Airflow Output: 250 lb/min (113 kg/min) at 68 °F, 60% RH, sea level 
• Weight (Dry): ~12,600 lb (5,590 kg) 
• Dimensions:
• Length: ~176″ (4.5 m)
• Width: ~82″ (2.1 m)
• Height: ~92.5″ (2.4 m) 

Operational Condition & Multimedia

• Only Hours: 916 (photo in listing)
• Condition: Great operational condition; will be freshly serviced and painted with automotive-grade clear coat before delivery
• Special Features: Dual hoses with couplers included, and there’s a video on this page showing the unit operating.